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The 3500/34 (125712-01) is a high-reliability Triple Modular Redundant (TMR) relay output module designed for the 3500 Machinery Protection System developed by Bently Nevada. This module provides the critical interface between the...
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The 3500/34 (125712-01) is a high-reliability Triple Modular Redundant (TMR) relay output module designed for the 3500 Machinery Protection System developed by Bently Nevada. This module provides the critical interface between the monitoring rack and emergency shutdown circuits in safety-critical machinery protection applications.
Engineered for mission-critical safety control, the 3500/34 uses 2-out-of-3 voting logic to ensure that a single relay or channel failure does not cause false machine trips or prevent legitimate shutdown commands. This makes it widely used in high-value rotating equipment protection systems where reliability and uptime are essential.
The module is organized into independent relay voting groups that can be configured using 3500 Rack Configuration Software to respond to specific alarm and danger states across the monitoring rack. This TMR safety architecture is widely adopted in oil & gas, power generation, and petrochemical facilities where Safety Integrity is critical.
| Item | Specification |
|---|---|
| Model | 3500/34 |
| Ordering Number | 125712-01 |
| Relay Logic | 2-out-of-3 TMR voting |
| Output Type | Form C (SPDT) Electromechanical Relays |
| Contact Rating | 5A @ 24 Vdc / 5A @ 240 Vac (resistive) |
| Response Time | < 10 ms (logic dependent) |
| Dimensions | 2.6 cm × 25.3 cm × 12.0 cm |
| Weight | 1.35 kg |
The 3500/34 (125712-01) is commonly used in:
Turbine emergency shutdown systems
Fuel valve and stop valve actuation
Motor starter interlock protection
Compressor and pump safety shutdown circuits
It is particularly suited for plants where false trips must be avoided while still maintaining high safety integrity for machinery protection.
How does TMR voting protect against false trips?
The module requires at least two out of three internal relay channels to detect a danger condition before changing output relay states. If only one channel detects a fault, the system will generate a diagnostic alarm but will not trigger a shutdown trip.
Is this module compatible with the 3500/32 Relay Module?
Both modules can coexist in the same rack. However, the 3500/34 is specifically designed for TMR voting applications, while the 3500/32 is typically used for simplex relay output protection functions.
