Bently Nevada 3500/32-01-00 3500 Series 4-Channel Relay Module

Description

Providing programmable alarm relay outputs within the machinery protection framework, the Bently Nevada 3500/32-01-00 functions as a highly reliable 4-channel relay interface for the 3500 Machinery Protection System. This configuration comprises the 149986-02 spare control module and the 125720-02 spare relay output module. Each channel can be independently programmed with logic equations to trigger shutdowns or alert sequences based on status inputs from adjacent monitoring modules in the rack. The system relies on its integrated backplane connectivity to bypass external communication latencies, executing safety-critical operations with deterministic accuracy.

Key Features

• Four fully independent, software-programmable Single Pole Double Throw (SPDT) relay outputs.
• Modular design dividing logic processing (control module) and physical connection interfaces (I/O module).
• Highly configurable voting logic (AND, OR, and notary combinations) defined via the 3500 Rack Configuration Software.
• Onboard LED indicators on the front panel display real-time OK and individual relay actuation statuses.
• Supports normally energized (de-energize-to-trip) or normally de-energized (energize-to-trip) wiring configurations.

Industrial Applications

• Turbine emergency trip and overspeed shutdown systems.
• Reciprocating and centrifugal compressor safety interlocks.
• Large industrial fan and blower auxiliary control loops.
• Generator and motor winding temperature alarm management.

Technical Specifications

Wiring Connection and Terminal Assignments

Empirical Engineering Insights

Alternative Models & Compatibility

The 149986-02 is the modernized, direct functional replacement for older legacy control card revisions such as the 125712-01. When swapping individual components rather than the entire 3500/32 assembly, confirm that the firmware version programmed in the 149986-02 is compatible with the existing rack backplane and the version of your 3500 System Configuration Software.

Application Pitfalls & Engineering Notes

When switching inductive loads (such as heavy-duty interlock solenoids or intermediate auxiliary contactors), contact arc discharge can lead to contact welding or EMI generation that disrupts adjacent monitoring channels. Systems engineers must install external RC snubbers or flyback diodes across the inductive load to protect the relay contacts from high-voltage transient spikes.

Commissioning & Wiring Tips

Ensure to carefully audit the state of the relays during rack boot-up sequence. Configured as "Normally Energized," these relays will transition states momentarily when power is applied to the rack. Critical shutdown lines must be interlocked or temporarily bypassed during power cycling to prevent spurious machinery trips.

Installation Guidelines