INSTRUCTION MANUALPADDLE TYPE LEVEL SW ITCH

MODEL： DPL

Meanings of indications for safety used in this Instruction Manual are as follows.
WARNING:

Indicates that improper handling assumes the risk of a fatal or serious injury.

CAUTION:

Indicates that improper handling assumes the risk of injury or damage to property only.

TOWA SEIDEN INDUSTRIAL CO., LTD.
HEAD OFFICETOKYO OFFICENAGOYA OFFICE

Phone: 81-6-6340-5522, Fax: 81-6-6340-5519
Phone: 81-3-5484-2171, Fax: 81-3-5484-2175
Phone: 81-52-937-5817, Fax: 81-52-937-5836

OSAKA PLANT

Phone: 81-6-6340-2831, Fax: 81-6-6349-6551

URL http://w w w .tow a-seiden.co.jp№EDP100-1
2009.11.21

Contents[1] Operating Principle .........................................................................................................

1[2] Standard Specifications ..................................................................................................

1[3] Models .............................................................................................................................

2[4] Cautions for Handling .....................................................................................................

3a. Determination of installation site .........................................................................

3b. Impact of powder particles ..................................................................................

3c. Vibration of hopper ..............................................................................................

3d. Relationship with transport equipment ...............................................................

3e. Slide flange type .................................................................................................

3[5] Cautions for Connection ............................................................................................

4a. Level switch external terminals ...........................................................................

4a-1. Power Supply ....................................................................................................

4a-2. Signal ................................................................................................................

4a-3. Check change of detection signal ....................................................................

5b. Wiring used and piping ........................................................................................

6c. Attachment and detachment of cover ..................................................................

7[6] Key Point Inspection ..................................................................................................

7<Inspection of internal mechanism> .......................................................................

7[7] Torque Adjustment .....................................................................................................

8[8] About Power Supply Fuse .........................................................................................

8[9] Repair and Replacement Method .............................................................................

9a-1. Attachment of blade ..........................................................................................

9a-2. Attachment of wire ............................................................................................

9a-3. Attachment of extension shaft ..........................................................................

9b. Replacement of internal mechanism ...................................................................

10b-1. Detachment of cover ........................................................................................

10b-2. Detachment of internal mechanism .................................................................

10b-3. Assembly after replacement .............................................................................

10[10] Assembly Inspection Method ....................................................................................

11[11] Trouble Prevention ...................................................................................................

11[12] Examples of Defects ................................................................................................

12

DPL Model Instruction Manual
Outline drawing (Model: DPL-100)
Aluminum casting Aluminum castingO-ringAluminum casting

Conducting
wire outlet[1] Operating Principle
This product a blade attached to the main shaft is rotated by a motor. When there is noload applied to the blade by an object to be measured, it is always rotating, however, when
the rotation of the blade is stopped by the object to be measured, the rotation of the motor
is electrically stopped and the contact output is issued.
In addition, when the force to stop the rotation of the motor is removed, the motor starts
rotation again, and the contact output is changed over.

Existence of an object to bemeasured is detected by such action.
[2] Standard Specifications
Power voltage

24V DC +/- 10%

Attaching method

Flange attachment JIS 5K65A

Power consumption

2.2VA

Contact output

1C contact 250V AC 0.1A (resistance load)

Detection torque (*1)

About 10.0 N cm

Slip torque (*2)

About 30.0 N cm

Rotation speed

2 rpm
Main body case, flange: aluminum casting

Material

Main shaft, blade: SUS304
Seal: nitrile rubber

Operating temperature

Inside the tank: -10 C to 70 C (no freezing is allowed)
Outside the tank: -10 C to 50 C (no freezing is allowed)

Operating pressure

Inside the tank: 0 - 196 kPa

Paint color

Munsell 10YR7.5/14 (yellow)

Please contact us for specifications of other models.
(*1) The detection torque means the torque value required to stop rotation of the motor.
(*2) The slip torque means the torque value to make the motor protection mechanism start
functioning in a case of overload or impact applied to the blade.

1[3] ModelsDPL□□□―Type of level switch

Material of flange

Existence of protective tube, material

1Standard type

0

With aluminum alloy coating

0

2

High temperature type2

SUS304 pasted (on the powder contact surface)

1

SUS304

5

Strong type3

SUS316 pasted (on the powder contact surface)

2

SUS316

4

Made of SUS304

4Titanium

5

Made of SUS316

7Screw-in type8

Titanium pasted (on the powder contact surface)

Model DPL-170

Model DPL-500
NutWasher

AluminumcastingO-ringAluminumcasting

Aluminumcasting

AluminumcastingO-ringConducting
wire outlet

Model DPL-200

None

Aluminumcasting

Aluminum

AluminumcastingO-ringConducting
wire outlet

Model DPL-500N

Aluminumcasting

Aluminumcasting

AluminumcastingO-ringAluminumcasting

Seal
SiliconrubberConducting wire outlet

Conducting
wire outlet

Model DPL-500W
Welding

Aluminum sleeve

Stainless steel
wire rope

Aluminum sleeve

Aluminumcasting

AluminumcastingO-ringAluminum
casting

Conducting
wire outlet

Model DPL-100EB
Dimension
variable shaft

Variable shaft
fixing fitting

Aluminumcasting

Pipe for variable
shaft

Stainless springsteel

Aluminumcasting

AluminumcastingO-ringVariable shaft
tightening fitting
Conducting
wire outlet

2

Aluminumcasting[4] Cautions for Handling
CAUTION

When attaching at an upper position

a. Determination of installation site
Install it at a position where the powder

Bad example

Good example

particle level actually changes.
b. Impact of powder particles
When installed directly below dropping at
the feeding port, etc., of powder particles,or due to impact of collapse in the bridge
phenomenon inside the hopper, etc., it may
be broken. Change the installation site, orWhen attaching at a lower position

provide a protective plate.
Bad example

Good example

c. Vibration of hopper
Avoid a place where mechanical vibrationof the hopper itself or vibration from avibrator, etc., are applied for long hours.
It may affect the detection action, and lifeof the level meter itself.
d. Relationship with transport equipment(ExamplesforreferenceofFull
Conveyor

conveyortransportation)◎ Level meter for “full” signal
Attach it to a position where it does not go

Empty

over even if all the remaining measured
objects on the conveyor enter the hopper.
◎ Level meter for “empty” signal
Attach it to a position anticipating the time
when the conveyor starts moving and theraw material is fed after the hopper “empty”

Hexagon socket head bolt

signal is issued.
e. Slide flange typeThe flange part slides toward the blade byloosening the hexagon socket head bolt.
Attach it to a position under good condition.
After determining the position of the flange,
firmly tighten the hexagon socket headbolt.

3[5] Cautions for Connection

Inverter control board

CAUTIONa. External terminals
a-1. Power Supply
24V DC +/- 10%, red/black
DC power supply has polarity (0V, 24V).

Powersupply

Pay careful attention so as not to make a
mistake in wiring.

Signal side

Inverter control board
It converts DC power supply to AC
power supply to drive the motor.
When DC power supply is turned on,
the LED lights up.

CAUTION

Motor side

Inverter controlboard

The power voltage is pasted on themain body.
As the voltage is displayed on thenameplate, make sure not to make amistake.

a-2. Signal
L: “b” contact
C: (common)
H: “a” contact

When blade is rotating

When blade is stopped

Between C and L: current carrying when
the blade is rotating.
Between C and H: current carrying when
the blade stops in thepower-on state.

Powersupply

Wire the signal appropriate for your use
from the terminals.
Contact capacity
250V AC 0.1A (resistance load)
30V DC 0.1A (resistance load)
CAUTION

4Powersupply

a-3. Check change of detection signal(micro switch for signal)

Changing of signal

Checking method of signal changeLightly turn the blade counterclockwise forabout 20 .
When the blade is turned counterclockwise
for about 20 ,Between C and H: current carrying state
Between C and L: no current carrying
state
Signal output

When the blade is returned,
Between C and H: no current carrying
state
Between C and L: current carrying state
If the blade is turned strongly more thanthat, a light clicking metallic sound is madeand the position of the blade is slipped
turning by 90 .
This is a result of the slip mechanism andnot a failure.

5

b. Wiring used and piping
Conducting wire outlet
b-1.
Main body

For wiring used, twist wires to crimp with acrimp type terminal and then connect to theexternal terminal.

Avoid a single wire

whenever possible.
Conducting wire
outlet fitting

b-2.
CAUTION

When using a cable, use a cable with afinished outside diameter 10 to 11.
If the cable size is not appropriate,

Examples of cables that can be used

rainwater or dust, etc., will enter resulting in

CVV (vinyl cable for control)
1.25 mm 4-core, finisheddiameter: 11
2.00 mm 3-core, finisheddiameter: 11a failure.
b-3.
CAUTIONoutsideoutsideAfter wiring, strongly tighten the conducting
wire outlet fitting.

VCT (vinyl cabtire cable)
0.75mm 5-core, finisheddiameter: 10.5
1.25mm 4-core, finisheddiameter: 10.5

It has bushing rubber

inside to tighten the cable and avoid rain ormoisture.
If it is loose, rainwater or dust will enter
resulting in a failure. If a wrong cable size
is used, it may also result in a failure.

Conducting wire outlet(cross sectional drawing)

Bushing rubber
Conducting wire
outlet fitting

6outside
outsidec. Attachment and detachment of coverIf the cover is not tightened firmly, rainwater,moisture, dust, etc., will enter resulting in afailure.
Observe this especially when it is used
outdoors.
1. Attachment of this cover is a screw-in
type.
2. When removing the cover, pay attention
to the O-ring and loosen the screw toremove it toward you. When attachingit, sufficiently tighten the O-ring andsecurely screw it in.
Firmly and securely tighten the cover by
CAUTIONscrewing in.
Signal use[6] Key Point Inspection

Motor use

<Inspection of internal mechanism>
Byremoving

therearcoverin

theprocedures specified in item c of [5], theinternal mechanism can be seen. Refer toitem a of [5], and inspect it.
The button on the observer’s left is for theInverter board

detection signal and the right is for themotor power supply.
There are a lot of small parts mounted on
the board, pay careful attention not todamage them.
Also, pay attention to the lead wire. Startwork after turning off the power supply,since there is a danger of electric shock.
Turn on the power after completing thework.

7[7] Torque Adjustment
Adjustment of the detection torque isSpring setting position(standard)equipped on the mechanism mounting
plate of the rear face (bottom) of theStrong

internal mechanism.

By changing thesetting position of the spring, it can be

Weakadjusted.
Avoid adjustment in an unreasonable state
like deforming the spring when adjusting
the detection torque. It negates the effectof the spring disabling detection.
Also, avoid using the “weakest” settingposition

wheneverpossible.

Itisrecommended to consider a solution bychanging the blade shape.
* Stableaction

canbeobtainedbychanging the blade shape.
Please consult us for details.

Change of detection torque (reference)
Strongest
WeakestAbout 10.0N cm to about 6.0N cm[8] Power Supply Fuse
A fuse is used in the power supply part ofthis product.

If the circuit of the board

should be broken, the internal electric
current increases, therefore the fuse works
to protect the circuit of the board.
The fuse can be released by turning on thepower again.

When the fuse works,

remove the cause.
The fuse does not stop the power supply,
therefore do not touch the parts on theboard, etc.
In an abnormal state, it may be very hot
and you may get burned.

Please pay

careful attention.

8[9] Repair and Replacement Methoda-1. Attachment of blade
The relationship between the main shaft
and the blade boss is as follows.

Thescrew A is a left-hand thread. Screw thenut ② into the main shaft ①, place the S
washer ③, and then screw in the bladeboss ④ .

As a screw locking agent isused for the thread part, please work
carefully.
a-2. Attachment of wire

Wire attachment hole

The relationship between the main shaft
and the wire (wire boss) is as follows.
The screw A is a left-hand thread. Screw
the nut ② into the main shaft ①, place
the S washer ③, and then screw in thewire boss ④. As a screw locking agent isused for the thread part, please work
carefully.

a-3. Attachment of extension shaft
Mounting EB/ED model extension shaft
1. Apply a screw locking agent on the screw of the extension shaft spring part.
2. Screw the extension shaft into the main shaft of the level meter.

The screw is aleft-hand thread.
3. Tighten it completely to the end with the tightening tool.
4. Loosen the M6 nut of the extension shaft fixing fitting, set to the L dimension in youroperating environment, and then tighten the M6 nut. (From the flange end face to thetip of the blade is the L dimension.)
Extension shaft fixing fitting

Stainless spring steel

S washer

Use screw locking
agent.

M6 nut

9M8 nut

Main shaft

Level meter main body

M8 P1 left-handthreadMounting EA/EC model extension shaft
1. Apply a screw locking agent on the screw of the extension shaft spring part.
2. Screw the extension shaft into the main shaft of the level meter.

The screw is aleft-hand thread.
3. Tighten it completely to the end with the tightening tool.
Stainless spring steel

S washer

Use screw lockingagent.

M8 nutMain shaft

Level meter main body

M8 P1 left-handthreadb. Replacement of internal mechanism
b-1. Detachment of cover
Work in the state that the power is shut off.
WARNINGIt may result in an electric shock.
As the cover ① is fixed to the main bodycase ② by screwing in, loosen the screw
to remove it toward you while paying
attention to the O-ring ③.
b-2. Detachment of internal mechanism
Remove the connected external wirings
fromtheirterminals.

The

internalmechanism is fixed to the main body casewith 2 screws.
Phillips

Remove them with ascrewdriver

andremove

Inverter control board

theinternal mechanism by pulling toward you.
b-3. Assembly after replacement
When the external wirings are connected tothe terminals as they were, attach thecover ①.
PowersupplyTurn on the power after completing theWARNINGwork.

10[10] Assembly Inspection Method
1. Check that the wirings are connected correctly with a tester.
2. Check the insulation resistance between each terminal and ground with a megger.
Never fail to check the above items 1 and 2 before starting the next inspection.
a. Turn on the power supply.
b. Check that the blade and the main shaft are smoothly rotating.
c. Touch the blade by hand or place the paddle main body into powder to check that thesignal is changed over.
(2 - 3 positions for 1 turn)d. Turn the blade by 90 by hand and check that the rotation of the shaft slips.
(2 - 3 positions for 1 turn)[11] Trouble Prevention
1. Do not give impact on the main body.
2. Check that the blade, main shaft, and protective tube are not bending.
3. Pay attention to the attachment of the cover so that no rainwater, dust, etc., enter.
4. Check that no material adheres to the blade or the main shaft.
5. When adjusting the detection torque, do not stretch the spring. It disables detection.
6. Avoid using the weakest torque whenever possible. It is recommended to consider asolution by changing the blade shape.
7. Do not make a mistake in the power supply voltage when wiring.
8. Do not mistake the power supply terminal for the alarm terminal when wiring.
9. Do not flow overcurrent or short circuit the alarm contact.
10. Use an appropriate crimp terminal and adopt a wiring method that is not easily
disconnected when wiring to the terminal.
11. Do not tighten the attachment screw to the terminal with more than the necessary force.
The screw may break off.
12. Prevent rainwater intrusion from the conducting wire outlet.
Examples when abnormality of detection action occurs (outline)
Abnormal state

Material inside tank

There is material,
however, the signal
does not change overto that side.

Bridge is caused by
the material, etc., andthere is a hollow spacearound the blade
resulting in idling of
the blade.
The material isadhered andaccumulated from thetank wall to the blade.

There is no material,
however, the signal
does not change overto that side.

This product failure state
Main shaft rotation

Signal changing

1. Power supply, voltage
2. Motor failure
3. Internal fuse is acting.

1. Contact failure of thecontact of the signaloutput unit.
2. Contact burning of thedue to overcurrent, etc.

1. Return action failure
due to clogging of theseal part.
2. Failure of the returnspring
3. Bending of the mainshaft
4. Deformation of themain body
5. Internal fuse is acting.

1. Contact failure of thecontact
2.Contact burning of thesignal output unit due toovercurrent, etc.

11

[12] Examples of Defects
1. Defective due to short-circuit accident
When wiring to the internal mechanism, the alarm side (L, C, H) and the power supply
side are mistaken.
◎ Only supply power after making sure.
2. Tightening failure of the cover
Especially when using it outdoors, rainwater enters, and corrosion, contact failure, etc.,
occur.
◎ Securely tighten the cover without fail.
3. Defective due to damage of the screws of the cover and the terminal block.
◎ Tighten them with appropriate screwdriver.
4. Defective due to intrusion of rainwater, etc., from the conducting wire outlet.
◎ Securely tighten the conducting wire and fittings.
Pay careful attention so as not to touch the terminal block by finger tip, etc. (Watch out forWARNINGelectric shocks)
5. When the power supply fuse acts.
◎ Malfunction of the internal mechanism board. Defective due to dew condensation
or adhesion of foreign matter on the board.
Or defective due to the above 2 or 4.
* Turn off the power supply once and turn it on again for recovery.
Created April 3, 2007, Ver. 1.0
Revised May 23, 2008, Ver. 1.1
Revised November 21, 2009, Ver. 1.2

12