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Notes: 1. In addition to the direct measurement made by the monitor, many channel types provide an enhanced data set consisting of a variety of proportional values that will depend on the monitor type and its configuration. For example, for a radial vibration channel this includes the basic overall (direct) vibration amplitude as well as gap voltage, 1X filtered amplitude, 1X filtered phase, 2X filtered amplitude, 2X filtered phase, NOT 1X amplitude, and Smax. These additional proportional values are provided for each channel, and ALERT alarm setpoints can be established on each proportional value, as desired. DANGER alarm setpoints can be established on any two proportional values returned from each channel.

2. 3500/60, /62, and /63 monitor types do not provide front-panel buffered output connectors.

3. Only standard differential expansion capabilities provided. For ramp differential expansion and complementary input differential expansion, use the 3500/45 Position Monitor instead.

4. 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.

5. 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.

6. 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 in addition to direct amplitude.

7. Any vibration channel can be configured for conventional “pie- shaped” acceptance region alarms. When configured 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 your nearest sales professional.

  • 8.

    Contact the factory or your local sales professional for details.

  • 9.

    Only channels 3 and 4 can be used for Case Expansion


10. 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.

11. The 3500/50 is not intended for use in overspeed protection applications. Use the 3500/53 instead.

12. Zero speed functionality requires both channels of the 3500/50 module, making it a single-channel monitor.

13. The 3500/53 is a single channel module, intended for use as part of a 1-out-of-2 or 2-out-of-3 (recommended) overspeed detection system.

14. 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.

15. The 3500/62 is designed to accept static proportional signals such as 4 to 20 mA, 1 to 5 Vdc, or any static proportional 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 to such signals, 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.

16. The 3500/64M is primarily intended for monitoring combustor pressure pulsation instabilities (“humming”) in gas turbines.


The 3500/32 Relay Module provides four double-pole, double throw (DPDT) relays that can actuate based on alarm conditions within 3500 monitor modules. The configuration software allows the user to program various combinations of alarms, ranging from an individual channel’s ALERT or DANGER status, to highly complex Boolean expressions that combine two or more channel statuses to provide special AND or OR voting. By adding the desired number of relay modules, the user can provide individual contacts for each channel, alarm type, and group of channels for global alarm annunciation.

The 3500/34 TMR Relay Module works in conjunction with a special TMR Rack Interface Module and three monitor modules to provide 2-out-of-3 voting for inputs.

Relays are epoxy-sealed and installed arc suppressors are standard. Users can program relays for either normally energized or normally de-energized operation.

The 3500 Rack also supplies a common system OK relay2 in addition to any alarm relays in the rack. This relay is located in the TDI/RIM’s I/O module and is connected to the OK circuits of all modules in the rack. These circuits monitor the operating condition of each module. Any fault in the module, its transducers, or associated transducer field wiring will be annunciated by the OK relay. This relay is a single- pole, double-throw (SPDT) type and is normally energized, providing added capability of annunciation in the event of primary power loss.

Notes: 1. Although not a required component of the 3500 System, we strongly recommend relays as the appropriate way to interconnect the 3500 System in auto-shutdown applications. Analog (e.g. 4 to 20 mA) and digital (e.g. Modbus*) connections are intended for operator annunciation and trending purposes and do not provide the fault tolerance or integrity necessary for highly reliable machinery shutdown purposes. 2. Dozens of possible event conditions within the rack can drive the NOT OK relay. For this reason, it is not intended for use as part of a

Specifications and Ordering Information Part Number 162096-01 Rev. F (03/07)

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