Electrical Configuration and Specifications

Relay configuration
The module provides 4 independent SPDT (Form C) relay channels, supporting TMR (Triple Modular Redundancy) 3-out-of-2 (2oo3) fault-tolerant voting logic.
Each relay channel can be independently programmed for alarm and danger (trip) activation.

Contact ratings

5 A @ 240 VAC

5 A @ 24 VDC

Suitable for driving external loads such as alarm lamps, horns, annunciators, and shutdown/trip devices.

Control logic

Programmable 2oo3 voting logic

Configurable alarm driver logic (AND / OR)

Compatible with vibration, displacement, speed, and other monitoring module signals in the 3500 system

Power supply

18–32 VDC (typical 24 VDC)

Power consumption: approximately 7.7 W

Supplied directly from the 3500 rack backplane

Environmental conditions

Operating temperature: −30 °C to +65 °C

Relative humidity: 5 % to 95 %, non-condensing

Designed for harsh industrial environments

Service life and reliability

Electrical life: > 10⁵ operations at rated load

Mechanical life: > 10⁸ operations

Ensures long-term stable and reliable operation in continuous-duty applications

Communication and configuration

Communication via the 3500 backplane bus

Supports System 1 software for configuration and diagnostics

Real-time upload of relay status, alarms, and fault information

Physical specifications

Module height: Full-height

Dimensions: 241 mm × 24.4 mm × 242 mm

Weight: Approx. 0.7 kg

Installation: Standard Bently Nevada 3500 rack card slot

Core Functions and Applications

TMR fault-tolerant control
The 2oo3 voting logic prevents false trips caused by single-point failures, significantly improving system safety. It is well suited for shutdown and interlock control of critical equipment such as turbines, compressors, and large rotating machinery.

Independent 4-channel programming
Each relay channel supports independent configuration of:

Trigger conditions

Time delay (0–30 s)

Logic behavior

This flexibility enables implementation of multi-level alarms, interlocks, and protection strategies.

Status diagnostics and monitoring
Relay status is monitored in real time via System 1 software, with support for self-diagnostics and event recording, enabling rapid fault localization and reduced downtime.

System integration
The module integrates seamlessly with 3500 monitoring modules and PLC/DCS systems, forming a complete monitoring–control–execution closed loop.
It is ideal for rotating machinery protection in industries such as power generation, oil & gas, and petrochemicals.

Bently Nevada 3500/34 125696-01｜TMR Relay Module｜