Introduction to the Bently Nevada 3500/22-01-02-00
The Bently Nevada 3500/22 is a critical component within the renowned 3500 Machinery Monitoring System, designed to protect and monitor rotating machinery in industrial facilities. The part number 22-01-02-00 specifically refers to a 4-Channel Relay Module.
This module is not a sensor itself but a "decision-making" unit within the rack. It receives vibration, position, or speed data from other modules in the same chassis (like the 3500/42 Proximitor or 3500/25 Keyphasor modules). It then compares this data to user-configured alarm setpoints. If a setpoint is exceeded, it activates its internal electromechanical relays to shut down the machine or trigger a critical alert, preventing catastrophic damage. Its primary role is to provide a robust and reliable safety interface.
Key Parameters & Specifications
The key physical and functional parameters for the 3500/22-01-02-00 are summarized in the table below.
| Parameter Category | Specification Details |
|---|---|
| Model / Part Number | 3500/22-01-02-00 |
| Description | 4-Channel Relay Module |
| Function | Provides up to four independent relay outputs based on alarm conditions from monitoring channels. |
| Number of Relays | 4 (Dual-in-line package) |
| Relay Type | Electromechanical (Form C) |
| Contact Rating | 2 Amps, 30 VDC / 120 VAC resistive |
| Power Supply | Derived from the 3500 rack backplane (+15 VDC, -15 VDC, +5 VDC) |
| Module Slots | Compatible with any monitor or power supply slot in a 3500 rack. |
| Status Indicators | LED for OK, Alert, Danger, Bypass, and Relay State for each channel |
| Communication | Configurable via the 3500 Rack Configuration Software connected to the 3500/92 Communication Gateway. |
| Dimensions (H x W x D) | Approx. 193 mm x 60 mm x 200 mm (7.6 in x 2.36 in x 7.87 in) Standard 3500 module frame size |
| Weight | Approx. 0.9 kg (2.0 lbs) |
Application Scenarios
The 3500/22 Relay Module is deployed in mission-critical scenarios where automatic machine shutdown or urgent alarm annunciation is required for safety.
Gas & Steam Turbine Protection:
Scenario: Continuously monitoring the shaft vibration and axial position of a power generation turbine.
Use Case: If vibration levels reach a "Danger" setpoint, the 3500/22 module instantly energizes its relay, sending a trip signal to the turbine's control system to initiate an immediate shutdown, preventing blade contact and severe mechanical failure.
Centrifugal Compressor Stations:
Scenario: Protecting large compressors in oil & gas pipelines or refinery processes.
Use Case: Monitoring for excessive radial vibration or a sudden thrust bearing failure. The relay module can trigger an alarm to alert operators ("Alert" setpoint) and initiate a unit shutdown ("Danger" setpoint) if conditions worsen.
Large Pump Trains:
Scenario: Safeguarding critical multi-stage pumps in water treatment or chemical plants.
Use Case: Using one relay for a high vibration alarm and dedicating another relay to trip the pump if the shaft position indicates severe bearing wear or seal failure.
Industrial Fan and Motor Systems:
Scenario: Protecting large induced draft fans or main motor drivers in heavy industry.
Use Case: The module provides a simple, hardwired safety backup. If the primary PLC or control system fails to respond to an alarm, the 3500/22 acts as an independent, dedicated safety device to halt the machine.
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