Description

Product Description

The Bently Nevada 3500/34 TMR Relay Module is a high-integrity output component designed for safety-critical machinery protection systems requiring Triple Modular Redundancy (TMR). It is engineered for applications where continuous availability and fault tolerance are essential, aligning with principles commonly referenced in safety instrumented system architectures.

The module operates within the Bently Nevada 3500 rack system and is used together with a dedicated TMR Rack Interface Module and multiple monitor modules to achieve 2-out-of-3 voting logic for signal validation and output control.

Each relay channel integrates configurable Alarm Drive Logic, enabling condition-based switching decisions derived from multiple monitoring inputs across the rack.

Redundant Architecture & Control Logic

• Triple Modular Redundant (TMR) relay design

• Three independent relay elements drive a single output path

• Supports 2-out-of-3 voting logic with external monitor modules

• Requires TMR Rack Interface Module for system integration

• Fully programmable logic using 3500 Rack Configuration Software

• Supports Boolean logic structures (AND / OR)

• Input sources include:

• Alarm alerts

• Danger conditions

• Not-OK system status

• Any monitored variable or combined signal set

Electrical Performance

• Typical Power Consumption: 9.6 W

• Relay Configuration: Three DPDT relays internally arranged as SPST output structure

• Channel Operation Mode: Normally Energized (NE) per channel

• Arc Suppression: Not implemented in this design configuration

• Relay Construction: Industrial epoxy-sealed assembly for environmental resistance

Relay Load Ratings & Service Life

• Contact Life Expectancy: up to 100,000 cycles under rated conditions

• DC Load Rating: 1.5 A @ 24 VDC

• AC Load Rating: 1 A @ 120 VAC

• Designed for stable switching performance in continuous duty environments

• Optimized for low failure probability in high-availability systems

Status Indication & Diagnostics

The module includes onboard LED indicators for real-time operational feedback:

• OK Indicator: Confirms module health and normal operation

• TX/RX Indicator: Shows active communication within the rack backplane

• Channel Alarm LEDs: Display active relay alarm state per channel

Environmental Specifications

• Operating Temperature: –30°C to +65°C

• Storage Temperature: –40°C to +85°C

• Humidity: Up to 95% non-condensing

• Sealing: Epoxy encapsulated for vibration and contamination resistance

• Designed for harsh industrial machinery environments

Functional Characteristics

• High-reliability TMR output architecture

• Fault-tolerant relay switching design

• Integrated alarm logic execution at channel level

• Compatible with 3500 rack-based monitoring and protection systems

• Supports continuous safety-critical operation in redundant configurations

Typical Applications

• Gas turbine protection systems

• Compressor emergency shutdown logic

• High-integrity safety interlock systems

• Power generation machinery protection

• Critical rotating equipment with redundancy requirements

FAQ

Q1: What makes the TMR version different from standard relay modules?
It uses three independent relay paths with voting logic to ensure output integrity in fault-tolerant systems.

Q2: Does it require additional rack components?
Yes, it must be used with a TMR Rack Interface Module and compatible monitor modules.

Q3: Can it operate without configuration software?
No, logic configuration requires Bently Nevada 3500 Rack Configuration Software.

Specifications

• Brand: Bently Nevada

Advantages

• High reliability in industrial environments
• Supports continuous operation
• Compatible with major PLC/DCS systems