3500 System
Datasheet
Bently Nevada Machinery Condition Monitoring

162096 Rev. J

Description
The 3500 System provides continuous, online monitoring suitable formachinery protection applications, and is designed to meet therequirements of the American Petroleum Institute’s API 670 standard
for such systems. The system’s modular rack-based design includes
the following components:
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3500/05 Instrument Rack (required)
One or two 3500/15 Power Supplies (required)
3500/22M Transient Data Interface (TDI) Module (required)
One or more 3500/XX Monitor Modules (required)
One or more 3500/32M (4-channel) or 3500/33 (16-channel)
Relay Modules (optional)
One or two 3500/25 Keyphasor* Modules (optional)
One or more 3500/92 Communication Gateway Modules(optional)
Input/Output (I/O) Modules (required)
3500/94M VGA Display (optional)Internal or external intrinsic safety barriers, or galvanic isolatorsfor hazardous area installations (optional)
3500 System Configuration Software (required)

System components are described in more detail in the following
section and in their individual datasheets.

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System Components
This section describes the individual components that make up a complete 3500 system.

Instrument Rack
The standard 3500 Rack is available in 19” EIA rail-mount, panel-cutout-mount, and bulkhead-mount versions.

Figure 1: 19” EIA Rail or Panel Mount Version
The rack provides slots for two Power Supplies and a TDI in the left-most rack positions that are reserved exclusively
for these modules. The remaining 14 slots in the rack can accommodate any combination of monitor, display, relay,
Keyphasor module, and communication gateway modules.
All modules plug into the rack’s backplane and consist of a main module and an associated I/O module. The I/O module
installs at the rear of the rack for panel-mount systems, and above the main module for bulkhead-mount systems.
Standard rack depth is 349 mm (13.75 inches), while bulkhead mount rack depth is 267 mm (10.5 inches). NEMA 4 and
4X weatherproof housings are available when required for environmental protection or when purge air is used.

Figure 2: Bulkhead Mount Version

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Mini Rack
A mini rack (12” wide instead of 19”) is also available and features 7 available monitor slots instead of 14. Like its larger
counterpart, the left-most slots are reserved for the Power Supply or Supplies and TDI Module.

The mini rack may be mounted in a panel cutout or, using an optional adapter plate, on 19” EIA mounting rails. Bulkhead
mounting is not available.

Power Supply
The 3500/15 Power Supply can be ordered for ac or dc input power, providing compatibility with voltage
sources worldwide. Line noise filters are standard. The 3500 Rack can operate from a single supply, or
dual supplies can be used to provide redundancy for situations that cannot tolerate power interruption.
Dual supplies reside in the upper and lower positions of the left-most rack slot. Redundant supplies
can use separate voltage sources. For example, the primary (lower) supply can operate with 120 Vac
power while the backup (upper) supply can be powered from an uninterruptible 24 Vdc source.
Each supply can individually provide power to the entire rack and its modules. When redundant
supplies are used, the lower supply acts as primary power for the rack while the upper supply acts as a
backup, ready to instantly and automatically operate as the primary rack supply without interrupting
rack functions should the primary supply fail.
The 3500/15 Power Supply module has self-monitoring functions that allow it to determine if all its
output voltages are within specifications. The module annunciates this via a green Supply OK LED on
the power supply’s front panel.

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Transient Data Interface (TDI)The TDI is the 3500 Rack’s primary interface to the configuration, display, and condition monitoring
software. Each rack requires one TDI, located in the rack slot immediately adjacent to the power supply
slot.
The TDI supports a proprietary protocol used by the 3500 Configuration Software to configure the rack andthe 3500 Operator Display Software to retrieve rack data and statuses.
The TDI also provides a direct interface with System 1* Condition Monitoring and Diagnostic software
without the need for an external communications processor.
The Rack OK relay is located within the TDI’s I/O module. It is driven by NOT OK conditions within the
TDI itself and within other modules in the rack.
Dozens of possible events within the rack can drive the Rack OK relay to NOT OK condition. For
this reason, the Rack OK relay it is not intended for use as part of a machinery auto-shutdown
circuit. It should be used for general annunciation purposes only.
The TDI supports self-monitoring functions both for itself and for the rack, in addition to those provided by
the individual monitor, relay, communications, and other modules. While the TDI provides certain
functions common to the entire rack, it is not part of the critical monitoring path and its machinery
protection functions.
The TDI has four front-panel LEDs that provide the following indications:OK

Indicates that the TDI Module and its I/O Module are operating correctly.

TX/RX

Flashes at the rate that communications between the TDI and other rack modules are
occurring.

TM

Indicates when the rack is in the Trip Multiply mode.

CONFIG OK

Indicates that any module in the rack is not configured or has a configuration error; that thestored configuration of the TDI does not match the physical configuration of the rack; or that asecurity option condition was not met.

System configuration is secured by means of a keylock switch on the front of the TDI and two levels ofsoftware password protection, preventing unauthorized changes to or tampering with the configuration
settings.
The TDI can be connected to a portable computer via a front-panel USB communications port for local changes toconfiguration. The TDI provides permanent system connectivity via Ethernet ports. It also provides a front-panel DIP
switch for assigning a unique rack address when multiple 3500 racks are networked with one another.
The TDI has a system reset switch on the front panel for clearing any latched alarms in the system as well as latched
NOT OK conditions. The I/O module provides a set of rear-panel connections, which facilitate remote activation of the
System Reset, Trip Multiply and Rack Alarm Inhibit functions.

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Monitor Modules
Each monitor occupies a single slot out of 14 available in the rack. Monitors are microprocessor-based
and offer digitally adjustable Alert and Danger setpoints for each channel. Alarms can be configured for
either latching or non-latching operation.
Status indications for each monitor are provided by front-panel LEDs, allowing observation without
operator interaction for convenient operation.
Most monitors provide independent 4 to 20 mA proportional outputs for each channel of the I/O module
for connection to associated industrial systems.
Where applicable, the I/O modules provide transducers with appropriate power via short-circuit-protected
terminals. OK detection routines within each monitor continuously check the integrity of each transducer
and associated field wiring.
Transducer input signals are buffered and sent to front-panel BNC connectors for all monitors except the
3500/60, /61, /65 (temperature) and /62 (process variable) monitors.
In addition to the direct measurement made by the monitor, many channel types provide anenhanced data set consisting of a variety of measured variables that depend on the monitor typeand its configuration. For example, radial vibration channels include the basic overall (direct)
vibration amplitude as well as gap voltage, 1X filtered amplitude, 1X filtered phase, 2X filteredamplitude, 2X filtered phase, Not 1X amplitude, and Smax.
These additional measured variables are provided for each channel, and ALERT alarm setpoints can beestablished on each variable, as needed. DANGER alarm setpoints can be established on any
measured variable value returned from each channel.

3500 Series Monitor Modules
Monitor
Type

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3500
/40M

Number of Channels(footnotes)

Channel Types (footnotes)lllRadial Vibration
Axial (Thrust) Position
Eccentricity
Differential Expansion (1)Four (2, 3)Same as 3500/40M, with the following additional channel types:
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3500
/42M

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3500
/44M

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Acceleration (4)Velocity (4)Acceleration2 (4)Velocity2 (4)Circular Acceptance Region (5)Shaft Absolute
Aeroderivative
Aeroderivative2

Four (2, 3)

Four

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Axial (Thrust) Position
Differential Expansion
Standard Single Ramp Differential Expansion
Non-Standard Single Ramp Differential Expansion
Dual Ramp Differential Expansion
Complementary Differential Expansion
Case Expansion9
Valve Position

Four (3)Hydro Radial Vibration (7)Hydro Stator-Mounted Air Gap
Hydro Acceleration
Hydro ThrustHydro Velocity
Stator End Winding
Multimode Functionality

Four (3)Rotor Speed
Rotor Acceleration
Zero-Speed
Reverse Rotation
Rotor Acceleration2
Zero Speed2
Reverse Rotation2

Two (8, 9)

Temperature
Differential Temperature

Six (10)ll

Process Variables

Six (10, 11)lDynamic Pressure

Four (12)Impulse Accel
Acceleration2
Recip Velocity
Low Frequency Recip Velocity

Four

Reciprocating Compressor Rod Drop / Rod Position /Hyper compressor

Four (3)

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3500
/45

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3500

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46M

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3500

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/50M

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3500
/60 & /61

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3500
/62
3500
/64M
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3500
/70M

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3500

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/72M

Reciprocating Compressor Cylinder Pressure, including:
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3500

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/77M

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Suction Pressure
Maximum Pressure
Minimum Pressure
Compression Ratio
Peak Rod Compression
Peak Rod Tension
Degree of Rod Reversal

Four

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Motor Stator Insulation Monitor

3500
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Leakage Current (each phase)Line Voltage (each phase)
Temperature (up to three channels)

Nine

Monitor Module Footnotes
1. Only standard differential expansion capabilities provided. For ramp differential expansion and complementary
input differential expansion, use the 3500/45 Position Monitor, instead.
2. The 3500/42M provides individual 4 to 20 mA proportional outputs for each channel. The 3500/40M does NOT
provide 4 to 20 mA outputs.
3. The monitor channels are programmed in pairs and can perform up to two of these functions at a time. Channels
1 and 2 can perform one function, while channels 3 and 4 perform another (or the same) function.
4. Channels configured for velocity or acceleration provide only direct amplitude. Channels configured for Velocity
II or Acceleration II provide 1X amplitude/phase and 2X amplitude/phase and bias voltage in addition to direct
amplitude.
5. Any vibration channel can be configured for conventional “pie-shaped” acceptance region alarms. Whenconfigured for circular acceptance regions, circular (rather than pie-shaped) acceptance region alarms can be
enabled. Refer to the 3500/42M Operations/Maintenance Manual for additional information, or contact yournearest sales professional.
6. Only channels 3 and 4 can be used for Case Expansion measurements.
7. The 3500/46M provides frequency response characteristics suitable for use on machines with very slow
rotational speeds, such as hydraulic turbine/generator sets, which often operate at speeds of 100 RPM or lower.
Also, special signal conditioning and tracking filtering is provided, allowing detection of rough load zone
operation, shear pin failure, and other hydro-specific conditions.
8. The 3500/50M is not intended for use in overspeed protection applications. Use the 3701/55 Emergency
Shutdown (ESD) system, instead.
9. Both Zero Speed and Reverse Rotation channel types require both channels of the 3500/50 module, making it asingle-channel monitor when used in these configurations.
10. The 3500/60 and 3500/61 provide identical functions except the 3500/60 does not provide 4 to 20 mA
proportional outputs. When these outputs are required, use the 3500/61.
11. The 3500/62 is designed to accept static proportional signals such as 4 to 20 mA, 1 to 5 Vdc, or any static
proportional voltage signal between –10 and +10 Vdc. When dynamic signals (i.e., those where waveform
information is required) are used, a 3500/40M or 3500/42M can often be programmed as a custom channel type,making the 3500 system compatible with virtually any static or dynamic signal from pressure, level,temperature, vibration, flow, position, speed, or other transducers. Consult the factory or your local Bently
Nevada sales professional for more information.
12. The 3500/64M is primarily intended for monitoring combustor pressure pulsation instabilities (“humming”) in gas
turbines.
Analog (4 to 20 mA) and digital (Modbus®) outputs from relay modules are intended for operator annunciationand trending purposes only, as they do not provide the fault tolerance or integrity necessary for highly reliablemachinery shutdown purposes. For these applications, the 3500/32M and /33 Relay Modules (described on thefollowing page) should be used.

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Relay Modules
The 3500/32M and 3500/33 Relay Modules provide a set of relays that can be programmed to actuate
based on alarm conditions in other monitor modules in the rack. The /32M module (left photo) uses
double pole double throw (DPDT) relays, while the /33 module (right photo) uses single pole double
throw (SPDT) relays. The /32M module has 4 DPDT relay channels and the /33 unit has 16 SPDT
relay channels. The /33 can also be configured to act as if it has DPDT relays. Doing this will use two
SPDT relays to perform the function of every DPDT relay that is configured.
Although relay modules are not a required component of the 3500 System, we strongly recommend
using them as the most appropriate way to integrate the 3500 System with automatic shutdown
applications. Any number of relay modules can be placed in any of the slots to the right of the TDI.
3500 System Configuration software facilitates programing “Alarm Drive Logic” that controls relay
actuation. This logic can be based on various combinations of alarms, ranging from an individual
channel’s Alert, Danger, or NOT OK status to highly complex Boolean expressions that combine two
or more channel statuses to provide special AND or OR voting.
By adding the required number of relay modules to the rack, it is possible to provide
individual relay contacts for each channel, alarm type, and group of channels for global
alarm annunciation.
The 3500 Rack supplies an overall Rack OK relay in addition to any alarm relays in the
rack. The Rack OK relay is in the TDI’s I/O module and is connected to the OK circuitsof all modules in the rack. These OK circuits monitor the operating condition of each
module.
Any fault in the module, its transducers, or associated transducer field wiring will beannunciated by the Rack OK relay. This relay is a single-pole, double-throw (SPDT) typeand is normally energized, providing added capability of annunciation in the event ofprimary power loss.
Dozens of possible event conditions within the rack can drive the Rack OK relay
to NOT OK status. For this reason, the Rack OK relay should not be used aspart of a machinery auto-shutdown circuit, and should only be used for generalannunciation purposes.

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Keyphasor Module
The 3500/25 is a half-height module that provides power and termination for up to two Keyphasortransducers. When applications require one or two Keyphasor transducers, simply install a single
3500/25 module.
The 3500 System can accommodate up to four Keyphasor transducers per rack by installing two
3500/25 Keyphasor modules in the rack.
When two 3500/25 Keyphasor modules are used, they must be installed in the same rack slot, one
above the other.
Keyphasor signals from the 3500/25 module(s) can be routed to appropriate monitor modules via the3500’s rack backplane for use in speed, phase, tracking filter, and other measurements.

Communication Gateway
Communication Gateway modules allow a 3500 system to digitally transfer
selected status and current value data to process control systems, historians,
plant computers, and other relevant systems.
The 3500/91 Ethernet Global Data (EGD) Comm Gateway Module
accommodates integration with EGD compatible control systems, such as the
GE Mark VIe.
The 3500/92 Comm Gateway Module supports Modbus® communication, via serial and Ethernet
protocols.
Multiple communication gateway modules can be installed in a rack when the system requires
redundant communication or must support multiple communication protocols simultaneously.
The modules do not interfere with the 3500 System’s normal operations or machinery protection
functions, ensuring that the monitoring system integrity is always maintained, even in the unlikely
event of a Communication Gateway module failure.

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Input/Output (I/O) Modules
Every module (Monitor, Keyphasor, Power Supply, Communication Processor, etc.) requires acorresponding I/O module. Main modules connect to the backplane inside the rack, and I/O
modules connect with the other side of the backplane, behind their associated main modules. For
bulkhead-mounted racks, only, each I/O module connects to the face of the backplane above its
associated main module.

Figure 3: Mini Rack Front View – Main Modules

Figure 4: Mini Rack Back View – I/O Modules

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Touch Screen Display
The 3500/94M VGA Display system provides a variety of flexible options, including both a 10” and 15” (diagonal) Touch
Screen display.
In addition to the 3500/94M VGA Display Module (left), the display package includes two I/O module choices. The
power-only I/O module (middle) is for the 10” Face Mount display, while the standard I/O module (right) is for all otherdisplay options.

Figure 5: 10” Display Face Mount option (upper), 15” Display 19” EIA Rack Mount option (lower)

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Intrinsic Safety Barriers or Galvanic_Isolators
For applications where the transducers are installed in a hazardous area, the 3500 System can be used with internal orexternal intrinsic safety barriers.
Internal safety barriers are generally preferred to external barriers because this option saves cost, requires no extra
cabinet space, and needs no additional wiring. Internal barriers also improve safety because the connections are prewired, reducing the possibility for errors introduced by wiring external connections between monitors and barriers.
Internal barriers also improve quality because, unlike external barriers, they require no special monitor scale factor
calibration to compensate for voltage drop across the barrier. For additional information, refer to the 3500 Internal
Barriers Datasheet, 141495-01.
If galvanic isolators are required to address your specific intrinsic safety requirements, pre-engineered external galvanic
isolators and an appropriate housing are available. For additional information, refer to the 3500 Galvanic_Isolator
Interface Datasheet, 141714-01.
Due to the additional circuitry, internal barrier I/O modules add 74 mm (3 in) to the rack depth. Actual
dimensions of all rack types can be found in the 3500 Monitoring System Rack Installation and Maintenance
Manual, document number 129766.

Prox/Seismic Internal Barrier I/O Module

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3500 System Configuration SoftwareThis Windows®-based application is used to establish settings for all components of the 3500 Machinery Protection
System. These settings are saved in the TDI in a proprietary RAK configuration file.

3500 System Configuration Software can be run on a laptop computer, which is connected locally to the USB port on
the face of the TDI, or on a remote computer, which is connected to the TDI via the plant network. Configuration
settings include the following:
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Alarm Setpoints
Channel Names
Communication Parameters
Relay Logic
Signal Processing Options

For more information, refer to the 3500 Software datasheet, 141527.

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Internal and External Terminations
Standard I/O modules accommodate field wiring connections directly to each I/O module. This is the traditional internaltermination option. We also offer an External Termination (ET) option that allows field wiring to be landed at ET blocks.
These ET blocks can be mounted where access is more convenient, such as on a cabinet wall, where the field wiring isless congested than when it connects directly to the back of each I/O module.
Each ET block then connects to its monitor’s I/O module using a single pre-engineered cable with multipin connectors,
resulting in neater, more easily serviceable installations.

Figure 6: I/O Modules for Internal Termination (left), and External Termination (right)

Figure 7: ET Blocks with screw terminals for lugged field wiring (left) and high-density “Euro” connectors for
non-lugged field wiring (right)

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Features Overviewl

The 3500 System is intended for continuous,permanent monitoring of rotating and reciprocatingmachinery in a variety of industries. It is specificallydesigned for use in auto-shutdown machinery
protection applications that require extremely highreliability and availability.

Although relays are not a required componentof the 3500 System, we strongly recommended
using them as the most appropriate way tointerconnect the 3500 System in autoshutdown applications. Analog (e.g. 4 to 20mA) and digital (e.g. Modbus®) connections
are intended for operator annunciation andtrending purposes only and do not provide thefault tolerance or integrity necessary for highly
reliable machinery shutdown purposes.

Applications
Machine types addressed by the 3500 System include
but are not limited to the following:
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using industry-standard protocols via the 3500’s
Communications Gateway module
In addition, analog (4 to 20 mA and relay)
outputs are available for connection to older
plant controls that cannot support digitalinterfaces.

Industrial gas and steam turbines in power
generation and mechanical drive service
Aeroderivative gas turbines in power generationand mechanical drive service
Hydro-electric turbines in power generation
service
Air or Process Gas Compressors (radial/axial,
centrifugal/positive displacement)
Turbo Expanders
Electric motors and generators
Exciters
Gear boxes
Pumps (centrifugal and positive displacement)
Fans
Blowers
Reciprocating compressors
Extruders and pelletizers

Display Options
Displays can range from local units mounted directly on
the rack’s front panel, to remote displays, to completely
blind monitoring systems with an as-needed HMI(Human Machine Interface) connection for
configuration and information. Multiple displays can beconnected concurrently without degrading system
performance or interrupting basic machinery protection
functions. See Graphs and Figures for more information
on VGA Touch Screen display options.

Monitor Configuration
Virtually every aspect of the 3500’s operation issoftware configurable, which allows a smaller set ofmonitor types to perform a broader variety of functions.
The list summarizes a few of the 3500 System’s
configurable options.

In addition, Bently Nevada Custom Products
engineering can often address special requirements forcustom configuration of an existing monitor type ormodifications to a standard monitor type toaccommodate monitoring of a unique machine. Contact
your local sales professional for further information.

Transducer
Normal thrust direction toward or away
type and scalefrom probe
factorAlarm delays

CommunicationsllTrip Multiply factor

Transducer OK
Filter corners
limitsThe 3500 System features separate, concurrent
digital communication capabilities for 3500
Configuration software and System 1 Condition
Monitoring and Diagnostic software using
proprietary protocols via Ethernet connections.
The 3500 System communicates with processcontrol and other plant automation systems

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Full scale
value

Integration (velocity to displacement,
acceleration to velocity)

Engineering
Units

Recorder output clamping value

Alarm
Setpoints

Timed OK / Channel Defeat
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Latching/non- Monitored variable value assigned tolatching alarms recorder output

Field Mounting

Normally
energized orde-energized
relaysIn many cases, the 3500 rack can be mounted on ornear the machine skid, foundation or local control panel,
keeping cable runs between the 3500 rack and themonitored machine(s) shorter, less costly, and lessprone to possible damage.

Relay voting logic

Channel Density

The locally-installed rack can use a single Ethernet
connection to communicate over the plant network.
This allows it to distribute display data and otherinformation to the control room, to a process control
system or to a plant engineer’s desktop computer.

4-channel Monitors allow a single full size (14 slot) 3500
rack to accommodate up to 56 monitoring channels.
This efficient use of space results in lower installation
costs by saving valuable cabinet space. It also
facilitates sharing common components, such as
displays, communications gateways, and power
supplies, across more channels for less cost perchannel.

The result is a machinery protection system withsignificantly lower installation costs than those that arelimited to being mounted in control room environments.
Optional NEMA 4 and NEMA 4X weatherproof
housings are available when installations require field
mounting of the 3500 System.

Reliability and Integrity
The 3500 System can be configured with varying levelsof redundancy. This ranges from simplex modules todual power supplies to redundant relay modules withwide ranging and flexible logical operator options forconfiguring complex relay logic as needed. The 3500
System also offers a variety of Safety Integrity Level(SIL) certifications (SIL 1 and SIL 2) for various 3500
monitors used in safety instrumented systems subject
to Functional Safety Certification.

Remote Accessibility
Networked connections allow you to remotely configure
a 3500 system and even assess the system when an
instrument problem arises. You can implement simple
changes, such as to an alarm setpoint or a filter corner,
without traveling to the site in person. This is useful for
installations at offshore platforms, compressor or pumpstations, emergency generators, and other locations
where on-site access to the instrumentation isinconvenient or impractical.

The 3500 System incorporates numerous selfmonitoring functions that can identify faults in themonitor modules and their connected transducers,
annunciate and identify problems via appropriate error
codes, and suppress channel operation automaticallywhen a failure could compromise correct operation of
the system.

Cybersecurity
The 3500 System’s two levels of password protection
combined with a keylock for configuration changes
ensures the system can’t be adjusted, changed, orconfigured except by authorized personnel.

The 3500 System stores configuration settings in two
separate locations in each module’s non-volatilememory. This redundancy allows each module tocompare configuration information for agreement and toflag any anomalies.

The 3500 rack records any configuration changes in thesystem’s event list, which accommodates effective“management of change” documentation.
We also offer Wurldtech™ Achilles® Level 1 certified
solutions as well as full engineered and hardened
network architectures when required to meet specificcybersecurity needs.

The use of redundant, non-volatile memory also
accommodates programming a spare module ahead oftime. It also ensures that, in the event a redundant
power supply is not used, monitor configuration is not
lost when power is interrupted and monitoring functions
can resume immediately upon reapplication of rack
power. Refer to the Bently Manuals DVD for 3500 SIL
Safety Manuals.

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Alarm/Event Lists

System Mounting Options

Extensive alarm and event lists retain the 2000 mostrecent alarm events and 1000 most recent system
events (configuration changes, errors, etc.). The
system’s TDI retains the lists, which provide a
description of each alarm or event and a corresponding
date/time stamp. These lists are available to the3500/94M VGA Display module and also to theCommunication Gateway module for export to processcontrol, historian, or other plant systems.

In addition to conventional 19” EIA rail and panel-cutout
mounting options, the 3500 System includes abulkhead mounting option, allowing the rack to be
mounted on a wall or other location where rear accessto the rack is not available.

Enhanced Data
Independent of System 1 Condition Monitoring and
Diagnostics software, the 3500 System can provide
multiple measurements from each transducer channel.

Time Synchronization

For example, in addition to direct (unfiltered) vibration
amplitude for a radial proximity probe channel, the 3500
monitor can return gap voltage, 1X amplitude andphase, 2X amplitude and phase, NOT 1X amplitude,
and Smax amplitude (when XY transducers arepresent).

The system’s real-time clock can be synchronized withexternal clocks, via the Communication Gateway or via
connected Bently Nevada software.
The 3500 System’s alarm and event lists then provide
time/date stamps that are synchronized with alarms
and events in other process and automation equipment.
This reduces or eliminates the need for elaborate,
hardwired “Sequence of Event” recorders.

Thus, a single radial vibration channel can return 8
conditioned parameters (measured variables) for a totalof 32 in a single 4-channel monitor module. This isparticularly valuable when machinery protection
strategies require alarms on these measured variables.
Activation or use of these values has no impact on rackdensity, and does not consume additional channels in
the monitor.

API 670 Compliance
When configured properly, supplied with the correct
number of relay modules, and provided with anappropriate optional display, the 3500 System complies
with the latest edition of the American Petroleum
Institute (API) Standard 670 for Machinery Protection
Systems, for shaft-relative vibration, axial position,
temperature, reciprocating compressor rod drop, andcasing vibration.

ALERT alarm setpoints can be established oneach proportional value, as desired. DANGER
alarm setpoints can be established on any
proportional values returned from eachchannel.

Hot Insertion
Data Display Options

All Monitors and Power Supplies (when redundant
supplies are used) can be removed or inserted when therack is under power. This facilitates easier
maintenance and system expansion without
interruption of machinery protection functions or
system operation.

The 3500 system can display data in a variety of ways,
summarized below.
lBefore removing an I/O module, the front-panel
portion of the module must first be removed.
This removes power from the slot so that the
I/O module can then be safely removed without
powering down the rack. I/O modules are NOT“hot-swappable.”

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Machinery protection-only “blind” system withjust local LED status annunciation provided on
the rack modules.
Temporary display capabilities can be obtainedby connecting a laptop computer to the rackusing the TDI’s USB port. 3500 Configuration
Software must be loaded on the computer.
A Communication Gateway module in the rackcan be used to provide status and current value
information to a process control system, plantcomputer, or other human machine interface

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using one of the 3500 System’s supported
protocols. Hard-wired 4 to 20 mA proportional
outputs and relay contacts can be used in lieu ofa digital interface to older control or automation
systems.
A VGA Touch Screen Display can be mounted
at the rack location, or remotely, for display ofdata, system status, and alarm events.
System 1 Condition Monitoring and Diagnostic
software enables full Machinery Management
functionality. Refer to www.bently.com fordetails.

Specifications and Ordering
Information
Consult individual datasheets for detailed information
on each module type. These datasheets are availableat www.bently.com, and on the Bently Manuals DVD.

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Graphs and Figures
This graphical reference section includes additional information about the 3500 System.

3500 System Example

1. Power Supplies: This particular rack has an AC-powered supply inthe primary (lower) position, and a DC-powered backup supply inthe upper position.
2. Keylock security prevents tampering with the configuration of themonitors in the rack.
3. Transient Data Interface (TDI): Provides an interface toconfiguration software and to System 1 Condition Monitoring &Diagnostic software. It also coordinates communication between all
modules in the rack.
4. Keyphasor Module: Accepts single and multi-event per-rotation
signals from proximity probes and magnetic pickups installed on
rotating equipment.
5. 3500/72M (Recip Rod Position) and 3500/77M (Recip Cylinder
Pressure) monitors are used for condition monitoring ofreciprocating compressors.
6. 60/61 Temperature Monitors.
7. 3500/42M Proximitor/Seismic vibration monitors.
8. Buffered transducer signals are provided for use with portable test
instruments.
9. Unused slots are protected with “Future Expansion” covers, and areavailable for use with additional modules.
10. 3500/33 16-Channel Relay Module.
11. 3500/92 Modbus® Communication Gateway.
12. Standard rack for 19” EIA rail mounting
Figure 1: 3500 Rack Photo

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3500/94M VGA Display Options
This overview shows the various components that make up the 3500/94M VGA Display options. For detailed
information, refer to the associated datasheet, 122M3217.

Figure 2: Single Rack with 10” Face Mount Display

Figure 3: Single Rack with 10” or 15” Remote Display

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Figure 4: Single Rack with KVM Extender

Figure 5: Multiple Racks with Router Box

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