OPERATIONSMANUAL

SB-4500 Series w/

ManualBalance
Control

L-4900-1

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Operation and Specification Manual
for theSBS Manual Balance Control
Covering the Following⎯ Model 4500-M series Control Unit
⎯ Model 4400-M series Control Unit

L- 4900-1

Manual Revision # 1.0© 2003 Schmitt Industries, Inc.
2765 NW Nicolai St.
Portland, OR 97210 USA
Phone: (503) 227-7908
Fax: (503) 223-1258
www.schmitt-ind.com

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SBS Manual Balancer

Table of Contents
System Purpose .......................................................................................................................................... 1
Operator Safety Summary.......................................................................................................................... 1
System Theory and Connection ................................................................................................................ 2
Environmental Considerations.................................................................................................................. 4
Other Sources of Vibration....................................................................................................................... 4
Machine Condition ................................................................................................................................... 4
Balance System Installation ...................................................................................................................... 5
SBS Control Unit...................................................................................................................................... 5
Vibration Sensor Location........................................................................................................................ 5
RPM Sensor Installation .......................................................................................................................... 6
Control Unit Operating Instructions.......................................................................................................... 7
Front Panel Controls ................................................................................................................................ 7
Balancer Main Screen Elements ............................................................................................................. 8
Rear Panel Controls................................................................................................................................. 9
Models without Front Panel ..................................................................................................................... 9
Card Rear Panel Connections ............................................................................................................... 10Power-On Display .................................................................................................................................. 10
SETUP Option ....................................................................................................................................... 11
Balancer Slot Status LED ...................................................................................................................... 11
MENU Settings and Selections................................................................................................................ 11
Balance Settings .................................................................................................................................... 11
Vibration units ........................................................................................................................................ 12
Plot Vibration.......................................................................................................................................... 12
Channel Name ....................................................................................................................................... 13
Menu Entry............................................................................................................................................. 13
RPM Sensor........................................................................................................................................... 13
Factory Settings ..................................................................................................................................... 13
Critical RPM ........................................................................................................................................... 13
Models without Front Panel ................................................................................................................... 14
Selecting Balance Settings ...................................................................................................................... 14
Background Vibration............................................................................................................................. 14
Balance LIMIT........................................................................................................................................ 14
Balance TOLERANCE ........................................................................................................................... 15
Balance CRITICAL................................................................................................................................. 15
Balancing ................................................................................................................................................... 15
Balance Process .................................................................................................................................... 15
Position Weights Screen........................................................................................................................ 16
Check Vibration Screen ......................................................................................................................... 17
Plotting Vibration ...................................................................................................................................... 18
Hardwire Interface..................................................................................................................................... 19
Hardwire Interface Protocol ................................................................................................................... 19
Input Pin Names and Functions............................................................................................................. 20
Output Pin Names and Functions.......................................................................................................... 20
Software (RS-232) Interface ..................................................................................................................... 21
RS-232 Commands and Responses ..................................................................................................... 22
RS-232 Operation Summary ................................................................................................................. 24
System Maintenance................................................................................................................................. 26
SBS Return/Repair Policy...................................................................................................................... 26
Sensor Cable Schematic ....................................................................................................................... 26
Trouble Shooting Guide ........................................................................................................................... 27
Displayed Error Messages ....................................................................................................................... 28
Appendix A: Electronic Specifications ................................................................................................... 30
Appendix B: Replacement Parts List ...................................................................................................... 31
Appendix C: Balancer Card Installation ................................................................................................. 32
Appendix D: System Connection Diagram............................................................................................. 33

System Purpose
A grinding wheel is the cutting tool of a grinding machine. In order for the grinding wheel toaccurately cut, produce smooth surface finishes, and generate correct part geometry, it is necessary to prevent
vibration in the grinding process. One of the primary causes of vibration in an operating grinding machine,is the existence of imbalance in the grinding wheel.
Imbalance is often due to the heterogeneous nature of grinding wheel construction. A wheel contains
great numbers of unevenly distributed grains, which cause an intrinsic imbalance. This imbalance will becompounded by eccentric mounting of the wheel, varying width of the wheel, imbalance in the arbor, andcoolant absorption into the wheel. Even a carefully established wheel balance, considering all these factors,
will not last long. Due to wear and frequent dressing of the wheel periphery, the rotational dynamics of agrinding wheel are always changing. For these reasons, dynamic balancing of grinding wheels has long beenrecognized as an important step in the production process.
The SBS Manual Balancer has been developed to provide dynamic balancing to grinding machine
operators with the following objectives in mind:• Attractive Purchase Price• Ease and Usefulness of Operation• Maximum Grinding Machine Efficiency• Minimal Installation Requirements• Minimal Maintenance Requirements

Operator Safety Summary
This summary contains safety information necessary for operation of the SBS Manual Balancer for
grinding machines. Specific warnings and cautions are found throughout the Operation Manual where they
apply, but may not appear in this summary. Before installing and operating the SBS Manual Balancer, it isnecessary to read and understand the entirety of this manual. After reading the Operation Manual, contact
Schmitt Industries Inc. for any additional technical assistance required.
Warning: Observe all safety precautions for operation of your grinding machinery. Do not
operate your equipment beyond safe balance limits.
Caution:To avoid equipment damage, do not drop or mistreat.

Warning: Failure to properly attach SBS Manual Balancer components to the grinding
machine, will result in safety hazard during machine operation.
Caution:Only qualified service technicians should attempt to perform service on the SBS
Manual Balancer. To avoid electric shock, do not remove the cover of theControl Unit, or remove cables, with power connected.

Warning: Never operate a grinding machine without all proper safety guarding in place.
Caution:To avoid equipment damage, make sure the line voltage is within the range
specified for the system (see specification section).

SBS Manual Balancer

1System Theory and Connection
The SBS Manual Balancer operates on a principle of mass compensation for a given grinding wheel
imbalance. The Intrinsic Imbalance of a grinding wheel is equal to the product of the wheel’s mass
multiplied by the distance between the wheel’s center of mass and the wheel’s center of rotation (figure 1).

eIntrinsic
Imbalance= e ( Wheel
Mass)
Figure 1r

Measured
Imbalance= r ( Balance
Weight Mass )Figure 2

The imbalance of a grinding wheel is determined in practice by use of the Measured Imbalance of thewheel. The Measured Imbalance is equal to the product of a mass, affixed to the grinding wheel to balance
it, multiplied by the distance between that mass's center and the center of rotation of the grinding wheel(figure 2). In both cases, the imbalance is given in terms of a mass multiplied by a distance, with(grams)(centimeters) being the units utilized for reference by the system.
In order to correct for various and changing imbalances which occur on a user's grinding machine, the
SBS Manual Balance Control uses two or three movable variable angle balance weights, which can be
independently positioned. These weights are usually supplied by the grinder manufacturer, and are typicallylocated in grooves in the wheel flange or wheel hub.
Figure 3 is a simplified block diagram of the SBS Manual Balancer. The system consists of the SBS
microprocessor-driven balance Control Unit, a Vibration Sensor, and an RPM Sensor. Imbalance isexpressed as spindle movement or vibration and is detected from the grinding machine by the sensor in peak
to peak units of measure. The vibration signal from the sensor is transmitted to the control unit, which filters
the signal by RPM. The control unit guides the user in positioning the grinder’s balance weights manually, sothat the amplitude of the incoming vibration signal is lowered to a user set level of acceptable balance.

2

SBS Manual BalancerVibration Sensor
RPM Sensor

Balance Control Unit
Vibration
Input

1 Pulse / Rev.
RPM Signal

Figure 3

Figure 4a shows a rotating grinding wheel that is unbalanced, with balancing weights attached. The
imbalance is represented by the white dot located on the circumference of the wheel. The other two black
dots represent two balance weights located in the wheel hub assembly. The Manual Balance Control
calculates the required position of the weights to achieve a triangulation offset which cancels out theimbalance, as shown in Figure 4b.
UNBALANCEDBALANCED

Figure 4a

Figure 4b

SBS Manual Balancer

3

Environmental Considerations
The SBS Manual Balancer is designed to dynamically correct for grinding wheel imbalance, with its
detrimental effects on quality of surface finish, accuracy of shape production, wheel life, and machine
bearing life. The system cannot correct for other environmental problems, which may also impact theseareas. This section is intended as a discussion of some common environmental problems, which may
influence grinding quality and the ability of the SBS Manual Balancer to fully demonstrate its benefits.
Other Sources of Vibration
A most common source of vibration is adjacent machinery. It is therefore important that a grinding
machine be properly shock mounted or otherwise isolated if vibration-producing machinery is operating
nearby. Another source of vibration may be components mounted on the machine, such as pumps, motors,
drives, etc.
The SBS Manual Balancer may not operate as well under the influence of certain external vibrations.
The system filters the vibration signal it detects from the grinding machine by the frequency of the spindle
RPM. This means that vibrations occurring at other frequencies than that of the rotating wheel will beignored by the system. In the case of adjacent machinery operating at the same frequency, or in beat withthat frequency, the system will be unable to distinguish vibrations occurring from wheel imbalance withthose originating in the adjacent machine.
An excellent test for environmental vibration is to monitor the vibration level on the grinding machine
while the spindle is not turning. The vibration level should be checked in various locations on the grinding
machine, but in particular at the location the vibration sensor is to be mounted. All surrounding equipment,
including any auxiliary pumps or attachments on the grinding machine should be operating during this test.
The SBS Manual Balancer can quickly let you accomplish this test (see: Background Vibration section).
The SBS Manual Balancer can not remove these vibrations.
Machine Condition
The grinding machine’s condition is important in determining the balance level, that the SBS Manual
Balancer can achieve. The spindle itself should be balanced, as well as all components in the drive train of
the spindle (i.e. belts, pulleys, motor, etc.). The balance system can readily determine if any significant
imbalance exists in the machine itself. Simply use the same method as described above for checking
environmental vibration, except test with the spindle running and with no wheel mounted. The SBS Manual
Balancer does not remove these vibrations.

4

SBS Manual Balancer

Balance System Installation
SBS Control Unit
The SBS Control Unit should be mounted in a location that allows observation of the display by themachine operator. Mounting hardware is available for installation on horizontal surfaces or for rack
mounting in standard 19" racks. Cabling connections to the control unit include the Vibration Sensor Cable,
the RPM Sensor, the power cord, and hardwire Interface Cable if applicable (see: System Connection
diagram). All connections are clearly labeled on the rear of the control unit. Be sure that the proper fuses(Two 3 Amp Time Lag) are installed. (see: Rear Panel Controls section).
Vibration Sensor Location
The Vibration Sensor can be mounted on the grinding machine either by use of the magnetic mountprovided, or by permanent stud mount. The magnetic mount should be used during initial system start up,
until a good permanent location is found on the grinding machine for the sensor. The sensor can then bepermanently stud mounted at that location. When stud mounting the sensor, a machined flat should be
supplied at the mounting location on the machine.
The location and installation of the sensor are crucial to successful operation of the SBS Manual
Balancer. Because of differing machine characteristics, Vibration Sensor location is specific to machinemodel. There are some general principles that should assist in finding a proper sensor location for yourgrinding machine.
1.
The first general principle is to locate the Sensor in the same direction as the centerline between
the grinding wheel and the workpiece. The best place to start is a flat machined surface on the spindle
housing over the bearing closest to the wheel, and perpendicular to the spindle’s centerline (figure 7a). A
vertical mounting surface is preferable on most cylindrical grinding machines because the sensor is in line
Sensor Mounted in
Direction ofWorkpiece Contact

Surface or Creep
Feed Grinders

Workpiece

Cylindrical orCenterless Grinders

Figure 5

with the grinding wheel and the workpiece. For this same reason, on surface grinders and creep feed
grinders, a horizontal mounting surface is generally best. Although the balancer itself may be mounted either
on the wheel or pulley end of the machine, the Sensor should always be aligned at the wheel end of themachine (figure 5).
SBS Manual Balancer

52.
The second general principle is to locate the sensor on a rigid part of the machine structure, where
vibration from the spindle will be accurately transmitted. On some machines, the wheel guard can be agood location to mount the sensor, if it is heavy enough and rigidly attached to the spindle housing. Thebalance system relies on vibration signals received from the Vibration Sensor to accurately display thecurrent vibration level, in peak to peak units, and to balance the grinding wheel. The system employs narrow
bandwidth filters that prevent vibration at non-spindle frequencies from being detected. However, inapplications where the motor or other machine components are running at the same speed or frequency as thespindle, interfering vibrations may result. Careful experimentation with the sensor’s location goes a longway in minimizing sources of interference.
RPM Sensor Installation
The RPM sensor is an inductive proximity sensor. The RPM Sensor must be located in position to
detect a one per revolution hole or protrusion in the spindle or attached rotating parts such as pulley, wheel
hub, etc. A simple hole drilled in a face or OD is often the simplest method of providing such a feature. The
Sensor should be mounted using the supplied mount bracket, and positioned so that the face of the sensor isabout 1mm from the high surface, and placed so that the hole or protrusion will pass directly under thesensor. The RPM SENSOR alignment feature under MENU will assist in verifying proper position.
CAUTION – Once the sensor is positioned, clamp the mount bracket tightly to the sensor body to lock it inplace, and prevent movement under vibration which might allow the sensor to contact the rotating surface.

6

SBS Manual Balancer

Control Unit Operating Instructions
The SBS Manual Balancer, once installed, is easily configured to the particular needs of your grinding
setup. The following section includes an overview of the control and interface features of the SBS Manual
Balancer Control Unit.
Front Panel Controls

Figure 6

Figure 6 illustrates the controls and indicators on the front panel of the Balance Control Unit. The following
is a description of these features:
1) ON/OFF. This button turns on the operating power for the system. When the system is turned on, theunit initiates a Power-On Display, and the green LED to the left of the button will be illuminated. When
turned OFF, the unit is in the stand-by mode, and the green LED is blinking. This indicates power isconnected to the unit, but the control is inactive.
2) CANCEL BUTTON. Pressing this button will cancel the operation in progress, or the last selection or
entry made.
3) LUMINESENT DISPLAY. This display is not a touch screen. Do not attempt to operate the control
unit by pressing on the display.
4) FUNCTION BUTTONS. The display is not a touch screen. Operation of the Control unit is primarily
accomplished via. these four multi-function buttons. The Menu Bar area of the display, to the left ofthese buttons, assigns the current function to each button.
5) SLOT STATUS LED. An LED indicator of three colors on the left side of the keypad display theoperational status of the balancer card or other device installed in that card slot.

SBS Manual Balancer

7Balancer Main Screen Elements
The following items are elements displayed on the Balancer Card Main Screen (figure 8).
a) MENU BAR. The right side of the display
is used to indicate the current function of
the four corresponding function buttons to
the right of the display. This includes
menu selections and direction arrows.
These function buttons are defined asfollows for the main screen of each
Balancer Channel. See Function Button
Map (figure 12) for an overview of thebalancer functions available.

b
d

f

a

c
e

Figure 8
MENU – When this button is depressed,
the display shows a menu listing withselectable operating parameters and other functions for the control unit. The displayed arrow
selection buttons are used to move the highlighted selection bar up and down the listing. Press the
ENTER button once the menu item has been highlighted.

SHOW ALL – This selection will only be displayed on the Menu Bar when more than one manualbalancer card is installed in the control unit. Pressing the corresponding button will display themonitored status of all balancer channels, or other devices.
TRIM – Initiates a Trim Balance run, which is a truncated balance cycle useful for rebalancing
slightly out of balance machines. (see: Balancing section).
BAL. – Initiates a full manual balance cycle. (see: Balancing section).
b) IDENTIFICATION TAG. The upper edge of the display is used to identify the five digit name givenby the user to the channel currently selected, and the current position in the menu structure.
c) VIBRATION DISPLAY. Indicates the measured vibration level of the grinding machine in either
microns or mils of displacement, or in millimeters/second or mils/second of velocity. The displayed
units are selectable from the Menu.
d) RPM DISPLAY. Displays Spindle RPM measured by the system.
e) BAR GRAPH. The bar graph reflects the monitored vibration level compared to the LIMIT,TOLERANCE, and CRITICAL levels.
f) STATUS. This text label is used to indicate the current status of the selected balancer channel.

8

SBS Manual Balancer

Rear Panel Controls
Figure 7 illustrates the rear of the control. The following four connections are located on the rear panelof the Balance Control Unit, and are common to any cards installed in the control.

Model SB-4500 Rear Panel
Figure 7

1)

POWER SUPPLY. Connection for line power input. Caution - before applying power tothe Control Unit, make sure the voltage is within specified voltages for the balancer (ACINPUT 90-260, 47-63Hz).

2)

FUSE HOLDER. Contains the line fuses. To replace fuses, remove the line plug fromreceptacle and use a small screwdriver to draw out fuse holder from the plug body. An
equivalent of the two supplied 3 Amp Time Lag 5x20 fuses should be used.

3)

RS-232 PORT. A DB-9 connector receptacle is used to provide external communication forserial transfer of data.

4)

DEVICE SLOTS. These numbered Slots are available for installation of balancer channelcards or other devices supplied by Schmitt Industries. Factory configuration of the control
unit will include a balancer channel card installed in Slot 1, with unused Slots being sealedwith blank cover panels.

Models without Front Panel
These are dedicated hardwire interface Controls which do not have a front panel, and can be activatedonly through the hardwire port on the Control Unit, or by use of an optional remote front panel. Operation of
the unit via the remote front panel is identical to that described above.
Rear panel control and connections for models without front panel are identical to those on thestandard SB-4500 channel unit, except for the addition of the REMOTE plug, located directly below the RS232 port. This DB-15 connector receptacle is used to connect the optional remote front panel unit (SB-4450)
to the control, where remote panel mounting is desired.

SBS Manual Balancer

9Card Rear Panel Connections

RPM Sensor Connection. The receptacle through which the RPM
Sensor cable makes connection to the Control Unit.

2)

Sensor Connection. The receptacle through which the Vibration
Sensor cable makes connection to the Control Unit.

3)

Hardwire Interface. Standard DB-25 connector receptacle for use in
making connection between the Control Unit and any grinding
machine CNC control. A complete description of hardwire interface
protocol is given in the Interface section of this manual.

Sensor
Hardwire Interface

1)

RPM

Figure 11 illustrates the rear of the individual balancer card (part SB-4543)
installed in the manual balance control. The control unit comes standard
with one such card. Other device cards can be purchased and added to thecontrol unit as required, to upgrade the system to allow full automatic
Balance Control with any of our balance systems, or to add AEMS acoustic
monitoring capability. The following three connections are located on therear panel of the manual balance control card.

Figure 11

Power-On Display
When the ON/OFF button is depressed on the front panel of the Control Unit, and power is applied tothe unit, the Control Unit performs a series of self-checks, which define its status, and the setting of various
operating parameters. Operator information regarding these parameters is displayed using the Control Unit’s
graphic display. The sequence follows this order:
1)

The company logo screen will be displayed and lights on the front panel are illuminated to verify
their operation. During this time, a SETUP function button is available. Pressing this button willallow language selection, and RS-232 Baud Rate selection. These setting are common to all installed
card slots.

2)

After a few seconds, the company identification screen will clear and the unit will display
information related to each slot or slots where card devices are installed, indicating each type ofdevice, and relevant identifying information. To extend the time that this information is displayed,press any one of the function buttons while the slot information is on the screen. Each press will add
six seconds to the display time, providing additional time to read the information.

3)

After a few more seconds, the slot information screen will clear, and the unit will display the initial
operational screen for the control unit. Where one balancer channel is installed, this first screen willbe the main screen. Where more than one device is installed, the unit will display either the SHOWALL monitor screen, or one channel’s main screen, whichever was selected when the unit was last
turned off.

4)

Any error conditions detected by the self-checks are displayed as “ERROR - code” where code lists
the reference code of the error detected. For detailed description of error codes, see Displayed Error
Messages section of this manual, or other additional product instruction addendum manuals.

10 SBS Manual Balancer

SETUP Option
This option allows the user to select the language used by the control unit for display, and the RS-232
baud rate used by the control for RS-232 communication. During Power-up, while the company logo screen
is displayed, pressing the SETUP button, changes the screen, first allowing the option of changing thelanguage used by the control for display. Use the arrow buttons to scroll through the available languages andpress the ENTER button to switch the control unit to the desired language. After pressing the ENTER
button, a screen for changing the baud rate for the RS-232 port is displayed. Use the arrow buttons to scroll
through the available baud rates and press the ENTER button to make the selection. Pressing the START
button at any time during this process will bypass SETUP and resume normal operation.
Balancer Slot Status LED
The status indication for installed Balancer channels is as follow:
Balance Level ABOVE CRITICAL. The LED is lit RED when the measured vibration level isabove the CRITICAL level selected by the user.
Balance Level OUT OF TOLERANCE. The LED is lit YELLOW when the measured vibrationlevel is above the TOLERANCE level selected by the user.
Balance Level BELOW TOLERANCE. The LED is lit GREEN when the vibration level of thegrinding machine is at or below the selected TOLERANCE limit.

MENU Settings and Selections
Note:

All menu items are set independently for each installed balancer card, or other device.

Pressing the MENU button listed on the display will produce a listing of menu items. This menu
provides a means of specifying system settings for individual balancer channels, and for performing certain
optional functions. Use the buttons corresponding to the up and down arrows to move through the menu
items. Press the ENTER button to select an individual menu item for edit or operation. Pressing the EXIT or
CANCEL buttons will exit the Menu screen, and return to the Main Screen for the channel. Description ofeach MENU listing follows:
Balance Settings
Use the button corresponding to the backward arrow to move the cursor from one digit to the next. Use thebuttons corresponding to the up and down arrows to increase or decrease the value of the selected digit.
When finished press the ENTER button to store any change in value, and move to the next balance setting.
Each of the following three balance settings are presented consecutively. Pressing CANCEL will return to
the Menu.
1. LIMIT target level - This is a target balance level that the user will try to achieve during a Balance cycle,
and is provided as a reference for the user only. The Balance system will always perform a “bestpossible balance”, and results will depend on accuracy of weight location during the entire balance cycle.
2. TOLERANCE level - This level sets the high end of the acceptable operating balance range. When thislevel is exceeded a Balance Out of Tolerance (BOT) error condition is reported. This signals the operator
or PLC/CNC control to re-balance the machine. This level needs to be determined by process
considerations. It should usually be 1 micron or more above the limit.
3. CRITICAL level - This level can be set at a value that provides a secondary warning of an extreme outof balance condition that may be damaging to the grinding machine or process. When this level isexceeded a Critical Balance out of Tolerance (BOT2) error is reported. This signals the operator or
SBS Manual Balancer

11PLC/CNC control to shut down the machine. This same error can also be triggered by excessive RPM(see: Critical RPM section).
4. BALANCE TYPE – 2 or 3 spread weights• 2 Spread Weights – Supports balance using two (2) equal fixed mass weights, which can bepositioned at any specific angle on the wheel holder. An angle scale must be provided for location of
the weights relative to some zero point. (0-360 degrees).
•

3 Spread Weights – Supports balance using three (3) equal fixed mass weights, which can bepositioned at any specific angle on the wheel holder. An angle scale must be provided for location of
the weights relative to some zero point. (0-360 degrees).

5. WHEEL ROTATION/ SCALE DIRECTION – Sets the direction of the angle scale on the machine, used
to position the balance weights. This is a relative direction in relation to the rotation direction of thewheel. The angle scale direction is the direction (clockwise or counterclockwise while facing the scale)in which the angle references (0°, 90°, 180° etc.) increase. The system must know if this direction is thesame or opposite the direction of the wheel’s rotation. The system can determine this automatically, but
to do so requires one extra balance run at the beginning of the balance cycle, which may not be desired insituations where this direction relationship remains constant. The following four settings are available.
• Automatic Always – With every balance operation,
Wheel
the direction will be determined automatically by
Rotation
having the operator run the extra direction run. This
Clockwise
can be useful where the spindle swivels or otherwisechanges directions.
••

Automatic Once – On the first balance cycle ran after
selecting this option, the system will automaticallydetermine the direction by having the operator run theextra direction run, and will store the result, and not
run the auto-determination cycle again.
Same – This setting allows the operator to manually
input the direction as SAME, without running theauto-determination cycle.

• Opposite – This setting allows the operator to manually
input the direction as OPPOSITE, without running theauto-determination cycle.

0

270

90

180

Scale direction shown OPPOSITE
Figure 9Vibration units
Press the corresponding button to select from the available vibration units that may be displayed (UM,MIL, MM/S, or MIL/S). The currently selected units are highlighted on the screen. When the unit button
has been pressed, the display will change, giving the opportunity to select the desired display resolution forthat choice. The buttons corresponding to the up and down arrows are used to set the resolution, andpressing the ENTER button stores the selection.
Plot Vibration
This function allows the user to perform a vibration spectrum sweep in a selected RPM range. This
operation will take several minutes. It will generate an on-screen graphical representation of the amplitudeof vibration monitored at each RPM range in the form of a bar graph. It will also produce a text listing of the

12 SBS Manual Balancer

top twenty vibration peaks encountered during the spectrum sweep. See the Plot Vibration section for
operational details.
Channel Name
Select a name or label to identify the balancer channel. This name is used on the various screens to
identify which channel is currently selected. SLOT1 is the factory default name assigned to all channels,
until the user selects a unique name.
Menu Entry
This selection on the menu list provides for use of a standard access code for menu protection. Setting
the channel to the protected mode denies access to the menu list unless the access code is entered. Thissetting ensures that system settings will not be accidentally compromised. The screen displays ENABLED
when Menu access is available, and PROTECTED when menu access is controlled by the access code.
Function buttons are assigned the numbers 1, 2, 3, and ENTER, which are used to input the access code. The
standard access code is 232123. Once the code has been entered and the ENTER button has been pressed the
MENU selection is protected. Re-entry to the menu list will now require entry of this code. The message
MENU ACCESS PROTECTED will be displayed notifying the user that the menu is password protected,
and the user will be given the opportunity to enter the code. Entering a code other than the correct number
will produce a message INCORRECT CODE ENTERED TRY AGAIN/ CANCEL.
To disable menu protection, enter the correct code to access the menu, select the MENU ENTRY item fromthe menu, and enter the code again to turn off the protection. The display for MENU ENTRY will display
ENABLED when protection has been disabled.
RPM Sensor
The speed sensor can be automatically calibrated the first time the unit is operated. After installation of
all system components and cables, switch on the controller and wait for it to display the main menu. Do notswitch on the spindle. Loosen the mounting bolts and shift the speed sensor, so that it touches the metal ofthe mating face on the part that normally rotates (spindle orchamber). Then pull the speed sensor or Nozzle Block backto the specified gap of 1 to 3 mm. The system should haverecognized and calibrated the speed sensor. If this is not thecase, chose “RPM SENSOR” from the MENU. A graphics
appears (figure 10) depicting the gap between speed sensor
and chamber or spindle. Position the speed sensor so that thegraphic shows the correct distance.
Factory Settings

Figure 10

Returns all user selectable parameters to the default factory settings.
Critical RPM
This setting allows the user to select a maximum RPM level, which when exceeded will cause theBalance Control to indicate an error condition. Toggle the selection cursor with the up and down arrow
buttons to highlight the CRITICAL RPM selection, and press the ENTER button. The screen now displays
the CRITICAL RPM entry screen. Any RPM level set using this screen will act as a maximum limit, and if
this limit is exceeded, the controller will indicate an error in two ways. The SLOT STATUS LED will
illuminate RED. In addition, the BOT2 Relay contacts will be tripped. This is an alternate cause of the
BOT2 error condition. This relay can be monitored by the machine PLC/CNC, and if desired can be used to
SBS Manual Balancer

13

set off additional warning systems or interrupt the operation of the grinding machine. To set the desired
RPM for the Critical level, use the left arrow button to select digits, and the up and down arrow buttons tochange the selected digit. Press ENTER to save the setting and return to other screens. To disable theCritical RPM feature, simply reduce the CRITICAL RPM level to zero.
Models without Front PanelAll operating parameters are set through the RS-232 port. Default settings of 9600 baud andMetric/Displacement vibration units can be changed only with the use of the optional Remote Keypadsupplied by Schmitt Industries, Inc.

Selecting Balance Settings
NEW WHEEL

Background Vibration
A check of the background vibration level must be performed, tocorrectly set up the system.
Mount the Vibration Sensor in the position to be used during
operation (see: Vibration Sensor Location section). Leaving thegrinding wheel off the machine, turn on the spindle and all secondary
machine systems (such as hydraulics, and motors). The vibration level
displayed without the grinding wheel is the background vibration level
for the machine. Make note of this background vibration level for
future reference in setting the operating parameters of the system. Referto the Environmental Vibration section for explanation of possible
sources of background vibration.
The following section details the user selectable LIMIT,TOLERENCE, and CRITICAL levels. For controls where more than
one balancer card is installed, the user should select the desired channel,
and then enter the MENU list. All menu settings are independently set
for each channel.

MEASUREDVIBRATIONLEVELSCRITICALTOLERANCEOPERATING
RANGE
LIMIT
0.1 MICRONSBACKGROUND

Balance LIMITThe SBS Manual Balancer is designed to balance quickly to a calculated “best balance” point. The
Limit is used only as a benchmark by the user to determine if balance cycles performed achieve apredetermined target result. The Balance system will always perform a “best possible balance”, and results
will depend on accuracy of weight location during the entire balance cycle. The Balance Limit is factory set
at 0.4 microns of displacement. A balance level of 1 micron or less is generally considered adequate formost applications. The lower the balance Limit is set, the more likely it is that environmental noise andslight errors in weight placement will prevent the Limit from being reached.
To set the balance Limit, the MENU button is pressed, and BALANCE SETTINGS is selected fromthe menu. The balance Limit is set using the arrow buttons, followed by pressing the ENTER button.
Typically you should set the Limit at a level that is 0.2 micron higher than the highest background vibrationlevel you noted in the background vibration check above. Press the ENTER button to enter the selected
Limit. Note: While Velocity display modes may be selected for monitoring machine vibration, the balancesettings (Limit, Tolerance, Critical) can only be made in units of displacement.
NO BALANCE SYSTEM IS CAPABLE OF BALANCING THE GRINDING WHEEL TO A
VALUE BELOW THE AMBIENT OR BACKGROUND LEVEL. Since the background vibration level
14 SBS Manual Balancer

is often a product of floor transmitted vibrations, these levels may change as adjacent machines are put intoor out of service. Set the balance limit during periods which reflect the maximum floor transmitted
vibration the system will receive.
Balance TOLERANCE
Related to the balance Limit, is the balance Tolerance setting. This operator defined setting establishes thevibration level, which acts as an “upper limit” for acceptable balance levels. When vibration reaches thissetting, the system will indicate the need to perform a re-balance operation. This indication is given both by
the yellow color of the SLOT STATUS LED on the front panel, as well as via the hardwire interface. The
Tolerance level is selectable in the same manner as the balance Limit. It must be set at least 0.2 microns
above the LIMIT setting. Typically it is set at least 1 micron above LIMIT setting.
Balance CRITICAL
Related to the balance Tolerance is the balance Critical setting. This operator defined setting
establishes the vibration level, which will act as an indicator of the operational vibration safety limit for thesystem. When reached, this setting will indicate the critical need to perform a re-balance operation. This
indication is given both by the red color of the SLOT STATUS LED on the front panel, as well as via the
hardwire interface. The Critical level is selectable in the same manner as the Tolerance setting. It must be
set at least 2.0 microns above the TOLERANCE setting.

Balancing
Balance Process
A balance cycle is an iterative or repetitive process of manually positioning the grinder’s balance
weights according to the system’s directions, and then checking the results of each move. Important –successful balance cycles depend on careful and accurate placement of balance weights at the locations
specified by the balancer. The user must provide the following markings on the grinder in order to allow forsuccessful balancing:
1. An accurate angle scale must exist on the grinder which references the position of the balance
weights. The scale accuracy and resolution will determine how accurately the balance weights canbe placed, which will determine how well the machine can be balanced. SBS can provide angle
scales for users which lack one. Contact your SBS representative for details.
2. Each of the balance weights should be marked with a center line (center of mass) indication. Thiscenterline is to be used to position each balance weight against the angle scale on the machine.
A full Balance Cycle will consist of the following separate balancing steps or runs:•

Zero Run – Determines the balance status of the wheel, without the effect of the manual balance
weights. This is achieved by positioning the weights at known null balance positions, so the weights
effectively balance each other.

•

Trial Run – Determines the change in balance produced by moving a known amount of weight to a
known position.

•

Direction Run – This run is optional, and only occurs when automatic direction detection is enabledfrom the balance settings menu. Determines the angle scale direction, relative to the rotation direction.
The phase change produced by moving the balance weight introduced in the trial run to a newpredetermined location is monitored.

SBS Manual Balancer

15

•Final Run – Purpose is to determine the “best balance” positions for the balance weights, based on theinformation provided in the previous runs above.

•

Trim Run – The TRIM button is available both from the main screen and from the Final Run results
screen. A Trim run is simply an additional Final Run (attempt at a best balance), based on informationfrom previous balance runs. Trim is normally not needed following a full balance cycle with accurate
weight placement, but may be useful to correct for slight errors in the previous balance runs.

TRIM Button/ Main Screen
A Trim Run can be useful as a shortened balance cycle where the wheel has worn or otherwise becomeslightly out of balance, but the fundamental balance state of the wheel has not changed. A Trim Run willassume that information from the last Zero Run and Trial Run are still valid, and re-calculate best balance
based on that information. If a Trim Run does not achieve the balance desired, the user should run a fullbalance cycle, so the system can determine updated Zero Run and Trial Run information.
BAL. Button/ Main Screen
To begin a full balance cycle, press the BAL. button from the main screen. The following screen will
be displayed. There are two types of screens for each step or run in the balance cycle. The position weights
screen will look like figure 12, and tells the user where to place the balance weights. Pressing Next on thisscreen will bring up the check vibration screen (see figure 13). The elements of these two screens are
consistent for each run of the balance cycle, and are described below.
Position Weights Screen
A1
A4

A2

A3

A5

Figure 12

A1) Instruction Section – This part of the screen tells the user what to do next. The “STOP SPINDLE” text
will flash until the unit detects no incoming RPM signal. The NEXT button will also not be available
until this condition is met. The user is instructed to stop the spindle, position balance weights asshown in the location detail, then press the NEXT button.
A2) Run Identification Bar – The highlighted bar shows the run reference number, followed by a descriptive
label for the run. A list of labels follows:
1: ZERO RUN – On the first run the user will position the weights at specified null positions.
2: TRIAL RUN – On the Second run, the user will move a balance weight to a specific location so thesystem can determine the effect.
3: DIRECTION RUN – This run is optional and only occurs when the control is set to auto-determine
the Scale Direction setting.
4: FINAL RUN. This run tells the user where to position weights for a best possible balance.

16 SBS Manual Balancer

5: TRIM RUN – This run is optional, and is initiated by pressing the TRIM button from the Final Run
Check Vibration screen. Trim runs allow slight adjustment in weight positions in an attempt to improvebalance. This can sometimes correct for small errors in previous balance runs.
A3) Location Detail – For two spread weight balancing, this area will look like the screen above, with eachweight position (A, B) listed, along with the location each weight should be positioned at.
A4) EXIT – will always exit the balance process, back to the Main Menu. When Exit is pressed from acheck vibration screen, any current balance run information is saved. The CANCEL button willaccomplish the same without saving any information.
A5) NEXT – This button will only be available when the spindle has stopped. Pressing this button will
display the Check Vibration screen, so the unit may determine the balance level achieved.
A6) BACK – (not pictured) Available only on screens beyond the Zero Run, located above the Next button.
Pressing this button will display a history screen, which allows the user to use arrow buttons to scroll
back though each of the balance runs conducted, and even allows the user to choose one of these earlier
reference points as their current start point to continue the balance process from. This allows the user to“go back” to an earlier point in the balance cycle if desired, without having to start over from the
beginning.
Check Vibration Screen
Figure 13 shows the elements of the second balance screen, the “Check Vibration” screen. This screen
will be displayed after each Position Weight screen, and has the purpose of showing the balance or vibrationlevel which has resulted from the prior placement of weights. The system will use the results found at thispoint for calculation of balance. Many of the screen elements are the same as on the Position Weight screen,with the critical differences described below.
B1

B2

B4

B3

Figure 13

B1) Instruction Section – This part of the screen tells the user what to do next. The “RUN SPINDLE” text
will flash until the unit detects a stable incoming RPM signal. The NEXT button will also not be
available until this condition is met. The user is instructed to start the machine spindle, check thevibration level to determine if the balance level is adequate, then press the NEXT button tocontinue with the next step in the process.
B2) Below the run identification bar, the screen now shows the measured vibration level, in the units
selected by the user. To the right of the vibration level, the measured phase angle is also displayed tointerested users.
B3) Reference – The bottom line of the screen displays the current measured RPM level.
B4) NEXT – This button will only be available when the spindle is running. Pressing this button will
display the next Position Weight screen, so the user may begin the next run in the balance cycle.
SBS Manual Balancer

17Plotting Vibration
RPM RANGE – After selecting the PLOT VIBRATION menu item, the first screen displayed allows theuser to press this button to select the RPM range. The RPM Range is the frequency range that will be
evaluated during the spectrum sweep of vibration amplitude. Once this selection is made, use the arrow
buttons to first set the low end of the RPM range, press ENTER to store the value, and then select the highend of the range in the same manner. When setting the RPM range, use the up and down arrow buttons toincrease or decrease values, and the left arrow button to move the cursor to the desired digit. While the RPM
RANGE screens are displayed, the number preceded by T= indicates the amount of time in seconds
estimated to perform the sweep, given the current RPM settings.
START – This button begins a vibration sweep for the selected RPM Range. This function will
perform an automated vibration sweep of a specified RPM (frequency) range, and display the results as agraph on screen. This function can be very useful in diagnosing machine condition induced vibration or
discovering environmental problems, which may have adverse effects on the grinding process. The RPM
range to be evaluated will vary by machine and process. On constant surface speed machines, the minimum
and maximum RPM should be determined. The suggested range to evaluate is from 0.4 x (minimum RPM)
up to 2.0 x (maximum RPM). This range is important because it includes all the likely frequencies, which
will have harmonic influence on the operating RPM range.
Select the PLOT VIBRATION item from the
MENU list. Press the RPM RANGE button to change thecurrently displayed RPM range as desired. Pressing the
START button will initiate a vibration spectrum sweep of
the currently selected RPM range. The rotating hour glass
figure on the right hand side of the display signifies thatthe controller is sweeping through the RPM range andrecording the maximum value in each monitored RPM
range. During this process, all recorded RPM, Vibrationlevel pairs are sent out the serial RS-232 port, in ASCII
format.

Figure 14

When the RPM sweep is complete, the display willchange to the screen shown (figure 15). The area
necessary to display the incremented RPM range isdependent on the RPM range selected, divided by the
number of available pixels across the horizontal axis. The
vertical scale is based on the peak value, displayed at the
top of the plot. The horizontal scale is logarithmic.
1)

VIEW DATA. Pressing this button will change thedisplay to a listing of peak vibration values (figure20). These are the top 20, or less, values recorded in
the selected range. The VIB./RPM button on thisFigure 15
screen switches the order of these values, allowing
them to be ordered either by vibration level or RPM. The arrow buttons are used to scroll up or down
through the peak values. The VIEW PLOT button returns to the screen showing the last recordedgraph.

2)

SEND DATA. Pressing this button will export the vibration peak values, and corresponding RPM
levels out the serial RS-232 port, in ASCII format. This information can then be captured and used asneeded by the user.

18 SBS Manual Balancer

3)

PLOT SETUP. This button returns the user to the setup screen for performing a vibration plot, where
alternate RPM settings can be input for plotting, or the plot process can be exited, by pressing the
EXIT button.

Hardwire Interface
There are two different options available for interfacing the SBS Manual Balancer Card with amachine controller. Either a hardwire interface or RS-232 software interface is supported. The hardwire
interface is supported via a standard DB-25 connector located on the rear panel of the Balancer Card, while
the Software interface is supported via the DB-9 connector located on the rear panel of the SBS Control
Unit’s Main Card, which is common to the whole control unit. Because of the many possible variations andconfigurations of cabling required for such an interface, it is left to the operator to supply the necessary
cable. When designing an interface for the SBS System, it is important to understand that it isintended that the grinding machine's PLC/CNC control operate the SBS System. It is not possible, oradvisable, for the SBS System to control the grinding machine. The following interface is provided as ameans to connecting with the SBS control, using information provided by the system, to maintain the desiredbalance parameters. The whole of this manual should be read before attempting to interface the SBS Systemwith any PLC/CNC control. Sections covering the interface of other SBS products installable in the SBS
Control, are covered separately in the manuals for such products.
Hardwire Interface Protocol
The hardwire interface consists of three parts: the interface power supply, the inputs, and the outputs.
The interface power supply is provided exclusively for use with the inputs of the hardwire interface. It
consists of three common pins and an output pin. The common pins are internally connected to chassis andearth ground, while the output is intended to provide a maximum of 30 mA at approximately +15VDC. Any
external power used for interface I/O must be from a SELV source or supply.
The three inputs provide optical isolation between input signals and the rest of the controller circuitry.
The inputs are activated by being pulled high, either by connection to the SB-4500/4400 interface power
supply output or by connection to a customer supplied signal. Activating the inputs requires at least 8 mA at
a voltage between 10 and 26 volts, AC or +DC, referenced to the SB-4500/4400 interface power supply
common. The common pins are internally connected to chassis and earth ground. The inputs are deactivatedby removing the connection to the power or signal source.
The four primary outputs consist of optically isolated, solid state, single-pole/double-throw relays.
These relays may used to supply an output signal by connection to the SB-4500/4400 interface power supply
output or by connection to a voltage source supplied by the customer. The relay contacts are electricallyisolated from all other circuits and are rated for 24 Volts DC or AC, 50 mA maximum. Inductive loads must
be protected against flyback.
The three contacts of a single-pole/double-throw relay are often referred to as “normally open”,“normally closed” and “common”. The term “common” in this sense does not imply connection to power
supply commons. The term “return” will be used below to indicate the common contact of the relay.

SBS Manual Balancer

19

CNC Interface Connector
Standard for SB-4400, and SB-4500

Common

1

N/C

2

N/C

3

N/C

4

RPM Return5

RPM Output

6

Common7

FBSI Relay Contact - NC

8

BOT Relay Contact – NC

9

BOT Relay Contact – NO

10

FBSI Relay Contact – NO

11

BIP Relay Contact - NO

12

14

BOT2 Relay Contact - NO

15

BOT2 Return16

BOT2 Relay Contact - NC

17

FPI Input

18

N/C

19

N/C

20

Supply Output

21

N/C

22

BOT Return

23

FBSI Return

24

BIP Return

25

BIP Relay Contact - NC

Common 13
Shell (Shield Gound)Figure 16

Input Pin Names and Functions
Pin# Name Description
17
FPI
Front Panel Inhibit- While this input is active, most operator actions at the front panel keypad
are disallowed. Specifically, the Menu button, the Manual button, and the Auto Button are
disabled. Still enabled are the Power button and the Cancel button, which can be used to stop
an automatic balance operation.
Output Pin Names and Functions
Pin#
22
10
9

Name
BOT-R,
BOT-NO
BOT-NC

Description
Balance Out of Tolerance: Return, Normally Open, and Normally Closed contacts.
This relay is energized when the sensed vibration level exceeds the operator definedTolerance. This relay is de-energized during an automatic balance operation.

15
14
16

BOT2-R
BOT2-NOBOT2-NC

Balance Out of Tolerance Two: Return, Normally Open, and Normally Closed
contacts. This relay is energized when the sensed vibration level exceeds the operator
defined Critical Tolerance, or when the spindle RPM exceeds the operator defined
Critical RPM. The vibration level sensing operation of this relay is de-energized
during an automatic balance operation.

24

BIPR

Balance In Progress: Return, Normally Open, and Normally Closed contacts. This

20 SBS Manual Balancer

1225

BIP-NO
BIP-NC

relay is energized while a balance operation is in progress.

23
11
8

/FBSI-R/FBSI-NO/FBSI-NC

Failed Balance/ System Inoperative: Return, Normally Open, and Normally Closed
contacts. This relay is energized after a successful Power On Self Test. It is deenergized if a fault condition arises.

6
5

RPM
RPM-R

This relay closes once per revolution. This is a buffered output of the RPM signal
generated by the balancer.

Software (RS-232) Interface
The SBS Manual Balancer provides an alternate RS-232 interface using the DB-9 connector. The RS232 interface allows the same control capability as the hardwire interface with the additional capability ofmonitoring the system status, setting of the Balance Limit, and performing a vibration spectrum analysis.
The following description applies to all models of SBS Control Units. The interface is identical for the SB4500 and SB-4400 units.
Interfacing
The RS-232 interface is a subset of the complete RS-232 specification, and uses only three wires forcommunication. When connecting to this interface, some systems will require additional jumper wires on
the control unit end of the cable for successful operation with this three-wire interface. The following pinson the DB-25 connector are used for the RS-232 interface.
Pin #Pin Name

Description

5
2
3

COM
TXD
RXD

Signal/Common
Transmitted Data RS-232-C
Received Data RS-232-C

Setting Baud Rate
The baud rate of the RS-232 interface is set at unit power-up, by selecting the SETUP option. The
factory setting for baud rate is 9600 baud, which should be adequate for most applications. To change thebaud rate, turn the Controller on by pressing the button marked ON/OFF in the upper right corner of themembrane keypad, and immediately after the unit is powered up, press the SETUP button. When thelanguage setting screen appears press the ENTER button again to change to the Baud Rate screen. To selectthe Baud rate, use the up and down arrow buttons, to select from the displayed list. Once the correct baudrate is highlighted press the ENTER button, to choose the new setting. The baud rate can be set from 300 to
19200 baud. Use of the optional Remote Keypad is necessary to change the baud setting for a SB-4400
Control Unit.

SBS Manual Balancer

21RS-232 Commands and Responses
When the Control unit is first powered up, the following messages are transmitted out the RS232 Port.
The first two lines are from the System Controller, the first is identifying text and the second is the firmware
version. The remaining lines identify the functions plugged into the Slot Card positions and the firmware
revision associated with each. The last five messages may be transmitted in any order:/SB-4500, Copyright (c) 1998, Schmitt Industries, Inc.<CR>
V0.02<CR>
2X1.00V0.09[GR1]/Standard Balancer<CR>
1X0/No Card<CR>
3X0/No Card<CR>
4X0/No Card<CR>
Commands - A message preceded with the digit ‘1’ through ‘4’ will be a command or responsereferring to Slot Cards 1 through 4, respectively. A message starting with any other character refers to the
System Controller.
The following commands from the RS232 Port are available:
Control Unit Commands
CommandC

Response

Meaning/ Example:
Control Panel Status Inquiry.

<Esc>C<CR>
CI

Control Panel is Inhibited

CI<CR>
CE

Control Panel is Enabled

CX

Control Panel is not installed

CE<CR>CX<CR>
CE

Control Panel Enable.

<Esc>CE<CR>K

Command Acknowledged

K<CR>
CX

Control Panel is not installed

CX<CR>CI

Control Panel Inhibit.

<Esc>CI<CR>
K

Command Acknowledged

Q

Command Not Accepted (Panel in use?)

CX

Control Panel is not installed
Version Request (main board firmware).

K<CR>
Q<CR>
V

<Esc>V<CR>
Vn.nn

Firmware Version

V1.00<CR>

22 SBS Manual Balancer

Balancer Card Commands (Cards are Individually Controlled)
CommandX

Response

Xz.xxVv.vv[sss]/text

Meaning/ Example:
Type (of slot card) Request.
< Esc >1X<CR> Start Slot 1 Info Request.
Slot info response. z indicates Slot Card type: 5 is Manual Balancer. xx is
specific hardware or balancer category. v.vv is balancer firmware revision. sss
is the user specified name for this card. The slash delineates a text commentthat briefly explains the card type.

1X5.00V0.55[SLOT1]/Manual Balancer<CR>
X0/No Card

No card is installed in the slot.

1X0/No Card<CR>
XX/NotResponding
G[sss][,[eee]]

U=units

A card is installed in the slot, but is not responding to the system.

1XX/Not Responding<CR>
Graph Vibration Spectrum. This takes vibration readings as a function of the
rpm of the vibration. Optionally specify sss as starting rpm and eee as endingrpm.
<Esc>1G500,2000<CR> Start Slot 1 Vibration Spectrum Program. Scanfrom 500 to 2000 RPM.
Spectrum program started (units given)

1U=UM<CR>
Grrr,vv.vvv

Graphic Vibration Point. One line is generated for each RPM measured. rrr isthe current rpm. vv.vvv is the measured vibration at the specified RPM.

1G500,0.04<CR>
1G550,0.05<CR>
GE

Graphic Spectrum End. The graphics vibration spectrum routine is finished.

1GE<CR>
GX

Cancel Vibration Spectrum.

<Esc>1GX<CR> Stop Slot 1 Vibration Spectrum Program.
GE
L[x.xx[,[y.yy][,[z.zz]]]]

Lx.xx,y.yy,z.zzGraphic Spectrum End
Limits Command. x.xx is Limit, y.yy is Tolerance, z.zz is Critical Vibration level,
all in microns. If x.xx is not present then the Limit level will not be changed. If
y.yy is not present then the Tolerance level will not be changed. If z.zz is notpresent then the Critical Vibration level will not be changed.
<Esc>1L<CR> Get Slot 1 Balance Limits.
Balance limit response (new values). x.xx is Limit, y.yy is Tolerance, z.zz is
Critical Vibration level, all in microns.

1L0.40,1.20,20.00<CR><Esc>1L0.08,,15<CR> Set Slot 1 Limit to .08, Critical level to 15.00, don’tchange Tolerance.

1L0.08,1.20,15.00<CR>
S[C]

S rrr,v.vv,[FBSI,][BIP,][FPI,]ERR=eee

Status Request command. If ‘C’ present then previously reported errors
condition will be cleared before the status is reported.
<Esc>1S<CR> Report Slot 1 Status.
Status response. rrr is RPM, v.vv is vibration level in microns, FBSI indicatesbalance failed/system inoperative, BIP indicates balance in progress, FPI
indicates front panel is inhibited. eee represent individual error lettersrepresenting error conditions. If the first letter is ‘@’ then an error condition
requires clearing (use SC command or press clear on front panel).

1S 1590,0.23,ERR=@GI<CR><Esc>1SC<CR> Report Slot 1 Status.
1S 1590,0.24,ERR=G<CR>
SBS Manual Balancer

23RS-232 Operation Summary
The RS-232 capability of the SBS Manual Balancer, when used in conjunction with a capable hostcomputer can provide a completely automated testing and balancing capability for a grinding machine. If thevibration spectrum is recorded at a point in time (perhaps when the machine is new), that record can thenbecome a reference for the gauging of bearing condition, spindle balance, and overall machine condition.
The RPM and vibration level readouts from the status line can be used to provide a remote indication of themachine operating speed, and characteristics. On some machines this data may be interpreted to indicate
when a grinding wheel needs to be changed or other maintenance performed.

24 SBS Manual Balancer

SBS Manual Balancer

25

GRINDING OR
DRESSINGCYCLEVIBRATION
EXCEEDSTOLERANCEBALANCE LIMITBALANCE TOLERANCEBACKGROUND VIBRATION LEVELVIBRATION PLOT AT SPINDLE FREQUENCY

SBC ALTERNATEBIP RELAY

BOT RELAYFBSI RELAY

BEWEENGRINDING
CYCLESBEWEENGRINDING
CYCLES= RELAY CLOSED= RELAY OPENWHEEL BALANCEDALLOW 2 SEC.
FOR RELAY TO OPEN

ALLOW 5MS
FOR RELAY TO OPEN

BALANCECYCLE IN
PROGRESSBALANCECYCLESTARTED

0.2 MICRONS (minimum recommended)

GRINDING OR
DRESSING
CYCLE

CNC/ System Timing Diagram

SBC SIGNAL

GRINDER ON

POWER UP

Figure 17

System Maintenance
SBS Return/Repair Policy
Schmitt Industries policy is to give highest priority to the service needs of our customers. We
recognize the cost of machine downtime, and strive to deliver same day repair of items arriving at ourfacility, whenever possible. Because of the complication and delays involved with international shipments,
customers outside the continental U.S. should contact their local SBS source for service support. Before
return of any equipment for repair, it is necessary for you to contact Schmitt Industries, Inc. for a Return
Materials Authorization (RMA) number. Without this tracking number, Schmitt Industries can not ensure
prompt and accurate completion of your repair needs. Failure to obtain an RMA number will likely result in
substantial delay.
Sensor Cable Schematic

VIBRATION SENSOR CABLE SCHEMATIC
For Sensor Part Numbers SB-14xx
CIRCULAR DIN
CONNECTORSHIELD TO CONNECTORBACKSHELL

RED 20 AWG (19/32)
BLACK 20 AWG (19/32)

CABLE CONNECTOREND FACING MALE
PINS
Figure 18

26 SBS Manual Balancer

Trouble Shooting Guide
If you experience trouble with the operation of the SBS Manual Balancer, the following guide isdesigned to help in determining the source of the problem.
Step 1
If the balance Control Unit is displaying any error messages, refer to the Displayed Error
Messages section of this manual for explanation of the message(s) displayed. Contact Schmitt Industries forassistance as required.
Step 2
If you are experiencing problems, with no displayed error messages, then check the Vibration
Sensor, and verify that the Sensor is firmly seated on the machine, with its magnet firmly tightened in place,and is properly connected to the Control Unit. Also check that the Sensor's position on the grinding machineaccurately reflects machine balance (see: Vibration Sensor Location section).
Also verify that there is an incoming vibration signal. If you receive an RPM signal, but zeroreading from the vibration sensor during this test, the Vibration Sensor and Control Unit should be returned
for repair. Contact Schmitt Industries for a return materials authorization (RMA) number.
Step 3
If the above checks shows no service problem with the SBS System, then the final area toinvestigate is environmental/application issues. The background vibration level on the machine should bemonitored under operation, and the Balance Limit setting checked against this level. (see: Environmental
Considerations section)
If you continue to have problems after following these steps, contact Schmitt Industries, or your SBS
Manual Balancer source for assistance.
Display Test Option
During control power-up, while the company logo screen is displayed, a functional test of the display
can be initiated by pressing one of the function buttons above the SETUP button followed by the SETUP
button. The screen will display a DISPLAY TEST message, and list buttons for TEST, START, and
SETUP. Pressing TEST will reverse the light and dark text areas. Pressing TEST again will display a fullscreen with all pixels lit. Pressing again will turn all screen pixels off. Pressing again returns the screen to
Display test. Also displayed are the revision reference numbers for the system main board and display
board. The LED status indicators on the left side of the display will sequence through the three colors tocheck operation. Press the START button to bypass SETUP and resume normal operation. Press the SETUP
button to continue to system setup.

SBS Manual Balancer

27

Displayed Error Messages
New self-diagnostic software has been incorporated into all SBS Balance Control Units. If a problem
ever occurs with an SBS system, It is quickly reported on the front panel display in the form of an error code.
Below is a listing of these codes, a description of when the Control Unit automatically runs each test, howeach code is cleared, the definition of each error message, as well as the prescribed action to be taken by theuser of the system. To further isolate defective components a series of test operations accompany some ofthe error codes.
A—

Checked continuously.........................................................

message:

RPM OUT OF RANGEOPERATION RANGE IS
300-30000
CHECK RPM SENSOR
Clears automatically.
definition: Displayed if the RPM signal coming from the RPM Sensor is below 300 RPM or exceeds 30,000
RPM and the RPM number cannot be displayed.
action: Verify operating speed of the grinding machine. Verify that the RPM sensor is properly aligned
to detect a once per revolution feature on the machine. If the machine is actually running above
30,000 RPM, contact your SBS Manual Balancer source for application consultation. If themachine is running within the operating speed limits with a properly aligned RPM Sensor, andthis error message persists, this indicates a failure of the RPM sensor. The RPM Sensor should
be returned for service.

B—

Checked Continuously........................................................

message:

VIB SENSOR DEFECTSHORT – CHECK CABLE
AND CONNECTORS SEE MANUAL
Clears automatically.
definition: Vibration Sensor presence not detected. This could be caused by a defective sensor or by nosensor being connected.
action: Check sensor connections and try Power-On again. Continued error messages indicate the needfor repairs to the Sensor.

C—

Checked Continuously........................................................

message:

VIB SENSOR DEFECTSHORT – CHECK CABLE
AND CONNECTORS –SEE MANUAL
Clears automatically.
definition: Vibration sensor short circuit detected.
action: Disconnect the balancer from AC power before checking cables and connectors, and sensor for
shorts. If the problem can not be isolated, the sensor, cable, and/or Control Unit should be
returned for repair.

28 SBS Manual Balancer

G—

Checked continuously .........................................................

message:

AUX POWER DEFECTSHORT – CHECK CABLE
AND CONNECTORS SEE MANUAL
Clears automatically.
definition: 24V Auxiliary Supply low – fuse open.
action: Determine which is the defective component by swapping with another system, or by using thefollowing diagnostic test. Return defective component for repairs. If in doubt, return all items.
test: Check for shorts in cables and connectors and re-initiate system check. If the error persists return
Control Unit and cables for repair.
H—

Checked Continuously ........................................................

message:

RPM/CNC POWER DEFECTSHORT – CHECK CABLE
AND CONNECTORS SEE MANUAL
Clears automatically.
Cleared by pressing Auto button.
definition: 15V Auxiliary supply low – fuse open.
action: Check for connector contamination or other shorts in the RPM Sensor and any extension cables
and re-initiate system. If the error persists, return the Control Unit and RPM Sensor cables forrepair. If you have the SBS system cabled to your PLC/CNC controller, verify that the interface
cable is free of electrical shorts. The interface cable is not supplied with the SBS system, andrepair is the responsibility of the user.

J—

Checked Continuously during Balance Cycle.....................

message:

NO RPM SIGNALCHECK CABLESCHECK SPINDLE
Cleared automatically.
Cleared by pressing Auto button.
definition: No incoming RPM signal, possible open in RPM sensor circuit.
action: Ensure that spindle is running, with balancer cable attached at both balancer and control ends.
Determine which is the defective component by swapping with another system. Return defective
component for repairs. If in doubt, return all items.

L—

Checked when Auto Balance Cycle Completed .................

message: CIRCUIT FAILURE
UNABLE TO MEASUREVIBRATION
SEE MANUAL
definition: Signal acquisition circuit failed.
action: Clears automatically, no action required other than clearing manually from the Balancing screen.
If the problem persists, the Control Unit should be returned for repair.

SBS Manual Balancer

29

Appendix A: Electronic Specifications
Control Unit
Installation: Pollution degree 2, Installation category II
RPM Reporting: 300 to 30,000 RPM
Vibration Range: 120 µG to 25 G
Vibration Display Resolution:
One of three options are
selectable by the userover the operational range
Vibration Display Repeatability:
6,000 RPM
300 – 30,000 RPM
Vibration Display Accuracy:
6000 RPM
300 – 30,000 RPM

0.1 µm0.01 µm0.001 µm

0.01 mil
0.001 mil
0.001 mil

0.01 mm/s
0.001 mm/s
0.001 mm/s

1 mil/s
0.1 mil/s
0.01 mil/s±1% @ 5.0 µm±2% @ 50:1 signal to noise±2% @ 5.0 µm±4% @ 50:1 signal to noise

Vibration Filter
3% width
60 dB per decade drop-off
modified Butterworth (SBS proprietary)
Balance accuracy+ /- 0. 1 microns displacement.
Power Requirements:
Supply: 120-220V ac, 50-60 Hz, 2A
Mains supply voltage fluctuations not to exceed +/- 10% of nominal supply voltage.
Environmental Conditions:
Intended for indoor use only.
Temperature: 5°C to + 45°C
Humidity: 0 to 95% relative humidity (non-condensing) throughout temperature range.
Altitude: <= 2000 m
Cleaning Instructions:Wipe unit off with clean cloth. May use mild detergent or water. Do not spray or immerse unit.
Vibration Sensor
Sensitivity Range+ /- 25g
Sensitivity Resolution 0.0001g
Voltage Sensitivity
100 mv/g
Excitation Current
2 to 8 ma
Frequency Response 0.5 to 5000 Hz
Operating Temperature 0 to +70 C

30 SBS Manual Balancer

Appendix B: Replacement Parts List
Part#

Description

Controls/ Options
SB-24xx-L
SB-4475-M
SB-4400-M
SB-4450
SB-43xx 1
SB-4543
SB-4512SB-4518
SB-4522

Hardwire Interface cable (standard lengths)
Control Unit w/ front panel (Expandable to 2 Channels)
Control Unit w/o front panel (Expandable to 2 Channels)
Remote Keypad (option for SB-4400)
Remote Keypad connection cable (option for SB-4400)
Additional Manual Balance Channel Card
Additional Mechanical Auto-Balancer Channel Card
Additional Hydrokompenser (water balancer) Channel Card
Additional AEMS Gap/Crash Monitoring System Card

Vibration Sensors 1
SB-14xx
SB-16xx

Sensor Cable (standard lengths)
Sensor Ext. Cable (standard lengths)

Control Mounting Hardware Options
SB-0451
Rack Mount Panel: SB-4500 – 19”
SB-0441
Rack Mount Panel: SB-4400 ½ Rack DIN 3U
MC-0400
Control Mount Bracket: SB-4500
SB-0442
Control Mount Bracket: SB-4400
Other Parts
EC-5605
CA-0009
CA-0009-G
CA-0009-B

Control Unit Fuse, 3 amp slow-blo 5x20 (2 required)Power Cordset
Power Cordset (Germany)
Power Cordset (British)
1)

xx = cable length in feet - standard options 11, 20, or 40 at standard price

SBS Manual Balancer

31Note: All Service (including card installation) shouldbe performed by a qualified technician, or the unit
returned to Schmitt Industries Inc. for service.
(Unit is shown upside down with the cover removed.)

32 SBS Manual Balancer
Figure 19

1. Unplug Unit, Invert, And Lay On A Non-Marring Surface.
2. Remove Back Cover Screws (1).
3. Loosen Front Cover Screws (2) A Few Turns.
4. Remove Bottom Cover (3) and Attach Grounding Wrist
Strap (4) To Rear Lip Of Panel
5. Remove Slot Cover Screws (5) And Slot Cover (6).
6. Plug Balancer Card (7) Into Back Plane Board (8).
7. Install Slot Cover Screws (5) Into Balancer Card (7).
8. Remove Grounding Wrist Strap (4)9. Install Cover (3) And Tighten Cover Screws (1 & 2).

Procedure:

1. 1/16" Allen Wrench
2. Grounding Wrist Strap

Tools Required:

Appendix C: Balancer Card Installation

CNC Cable
SB-2411 11ft [3.4m]
SB-2420 20ft [6.1m]
SB-2440 40ft [12.2m]

Power Cord 10ft [3.0m]
CA-0009 (American)
CA-0009-B (British)
CA-0009-G (German)

90-260 VAC

Control Unit
-M Version

RS-232 Serial Cable
Commercial ProductNot Supplied by SBS

Sensor Extension Cable
SB-1611 11ft [3.4m]
SB-1620 20ft [6.1m]
SB-1640 40ft [12.2m]

Sensor w/ Cable
SB-1411 11ft [3.4m]
SB-1420 20ft [6.1m]
SB-1440 40ft [12.2m]

Customer
Suppy
8MA, 10-26V
AC or +DC
Use Either SB-4500 or
Customer Supplied Power
SupplyBOT
Relay

SB-4541 Ring Card

BOT2
Relay

FBSI
Relay

12V AC or DC 50mA MAXIMUM.
Inductive Loads Require Protection

BIP
Relay

Customer CNC

RPM
Relay

N/C – Do Not Connect

Extension Cable
SH-1779 30ft [10m]Speed Sensor w/ Cable
SH-1778 10ft [3.0m]

Figure 20

Appendix D: System Connection Diagram

FPI INPUT+15V DC OUT

SBS Manual Balancer

33