Introduction
The Bently Nevada 3500/90 125728-01 is a specific hardware revision of the 3500/90 Relay Module, a critical output component within the GE Bently Nevada 3500 Machinery Protection System. This module serves as a highly reliable interface between the monitoring system and external control circuits.
Its primary function is to convert system alarms, warnings, or shutdown signals generated by other monitoring modules (like vibration or speed monitors) into physical, isolated relay contact closures. These relay contacts are then used to activate or deactivate external devices such as annunciators, PLCs, alarm horns, or even initiate a safe shutdown of the machinery. This module is essential for taking automated, safety-critical actions based on machinery health.
Parameters / Specifications
The key technical specifications for the Bently Nevada 3500/90 125728-01 are summarized in the table below.
| Parameter | Specification |
|---|---|
| Part Number | 3500/90 125728-01 |
| Product Line | GE Bently Nevada 3500 System |
| Module Type | Relay Module |
| Number of Relays | 4 or 8 (configuration dependent) |
| Relay Contact Rating | 2 A @ 30 V DC / 0.5 A @ 120 V AC |
| Relay Contact Type | Form C (SPDT - Single Pole, Double Throw) |
| Isolation | 1500 V RMS (channel-to-channel and channel-to-ground) |
| Power Supply | Derived from the 3500 Rack |
| Communication | Via the rack's backplane with other 3500 modules |
| Status Indicators | LED for each relay status (Active/Not Active) |
| Configuration | Configured via the 3500 Rack Configuration Software |
| Dimensions (H x W) | Standard 3500 Series Module (Approx. 3.9" x 8.7" or 99 mm x 221 mm) |
| Weight (Approx.) | 1.3 lbs (0.59 kg) |
| Operating Temperature | 0°C to +65°C (+32°F to +149°F) |
Application Scenarios
The 3500/90 Relay Module is deployed as a key "action" component in a machinery protection system, providing critical outputs for machine safety and operator awareness.
Typical Application Scenarios:
Critical Machinery Shutdown (Trip):
Initiating an emergency shutdown of a turbine, compressor, or pump when a dangerous condition (e.g., overspeed, excessive vibration) is detected by a monitoring module.
Alarm Annunciation:
Triggering visual and audible alarms on a control panel when an alert condition is detected, allowing operators to take corrective action.
Auxiliary Equipment Control:
Starting or stopping auxiliary systems like lubrication pumps, cooling fans, or ventilation systems based on machine operating status.
Process Interlocks:
Providing safety interlocking functions by enabling/disabling other equipment based on machine protection system status.
Industries of Use:
Power Generation
Oil & Gas
Petrochemical & Refining
Heavy Industrial Manufacturing
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