Overview
The Bently Nevada 3500/32M, also cataloged as the 3500/32M 4-Channel Relay Module, operates as a dedicated hardware component for relay output execution within the Bently Nevada 3500 Machinery Protection System. The module provides four programmable SPDT relay outputs for alarm, shutdown, and status logic control.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 3500/32M |
| Brand | Bently Nevada |
| Product Type | 4-Channel Relay Module |
| System Platform | 3500 Machinery Protection System |
| Origin | USA |
| Weight | Main module: 0.7 kg; I/O module: 0.4 kg |
| Dimensions | Main module: 241 mm x 24.4 mm x 242 mm; I/O module: 241 mm x 24.4 mm x 99.1 mm |
| Operating Temp | -30 deg C to +65 deg C |
| Storage Temperature | -40 deg C to +85 deg C |
| Humidity | 95% non-condensing |
| Power Consumption | 5.8 Watts typical |
| Relay Type | Single-pole double-throw (SPDT) epoxy-sealed relay |
| Relay Channels | 4 independent relay outputs |
| Rack Position | One full-height front slot and one full-height rear I/O slot |
| Relay Mode | Selectable Normally De-energized (NDE) or Normally Energized (NE) |
| Contact Life | Minimum 100,000 cycles at 5 A, 24 VDC or 240 VAC |
| Arc Suppressor | 250 Vrms installed as standard |
| Minimum Switched Current | 100 mA at 12 VDC |
| DC Contact Rating | Maximum 2 A at 0 to 30 VDC, 0.75 A at 48 VDC, 0.2 A at 125 VDC |
| Maximum DC Voltage | 125 VDC |
| AC Contact Rating | Maximum 2 A at 250 VAC, 450 VA switched power |
| Front Panel Indicators | OK LED, TX/RX LED, CH ALARM LEDs |
Rotor Dynamics and Relay Logic Processing
The 3500/32M processes alarm states from 3500 rack monitoring modules and executes programmable relay logic through Alarm Drive Logic. The module combines Alert, Danger, Not-OK, and Programmable Relay Logic (PPL) inputs using AND and OR Boolean operations.
Additionally, Bently Nevada machinery monitoring systems apply rotor dynamics analysis principles to determine vibration-related alarm conditions before relay activation. The relay module receives processed monitoring states rather than direct vibration probe signals, allowing the system to separate signal evaluation from physical relay switching.
The module works with 3500 monitoring channels that perform eddy-current probe scaling, gap voltage validation, and dynamic machinery condition calculations. Therefore, the 3500/32M provides the electrical interface for external alarm circuits after mechanical parameter evaluation.
Frequently Asked Questions
Q: Does the 3500/32M directly connect to proximity probes or vibration sensors?
A: No. The 3500/32M receives logic states from 3500 monitoring modules and controls relay outputs. Proximity probes and vibration sensors connect to dedicated monitor modules.
Q: Can each relay channel operate independently?
A: Yes. Each of the four relay channels supports independent programming through Alarm Drive Logic and allows separate NDE or NE operating mode selection.
Q: What communication indicators are available on the front panel?
A: The module provides OK, TX/RX, and CH ALARM LEDs to indicate module status, rack communication activity, and individual relay alarm conditions.
Field Installation Guidelines
- Install the 3500/32M in an available full-height slot within the 3500 rack configuration.
- Place the module according to the rack layout requirements and ensure proper backplane connection before operation.
- Verify relay wiring polarity and contact configuration before connecting external alarm or shutdown circuits.
- Use shielded wiring practices for external control circuits where electrical noise may affect relay operation.
- Connect cable shields according to site grounding standards and avoid routing relay wiring parallel to high-voltage power conductors.
- Confirm relay operating mode selection before commissioning, including Normally Energized or Normally De-energized configuration.
- Check front panel LEDs after installation to verify module power status and rack communication condition.
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