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The 3500/32 (125712-01) is a high-performance 4-channel relay output interface designed for the 3500 Machinery Protection System developed by Bently Nevada. This module provides electrically isolated relay outputs for alarm signaling, safety...
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The 3500/32 (125712-01) is a high-performance 4-channel relay output interface designed for the 3500 Machinery Protection System developed by Bently Nevada. This module provides electrically isolated relay outputs for alarm signaling, safety interlocking, and emergency shutdown control in mission-critical machinery protection systems.
The 125712-01 allows flexible logic mapping between monitor channels and relay outputs. Using 3500 Rack Configuration Software, engineers can assign relay activation logic based on vibration, temperature, or position monitoring conditions. This enables sophisticated machine protection strategies across multiple monitoring parameters.
A key design feature is its internal redundancy and high-reliability switching architecture. Each channel contains two SPDT relays configured as DPDT logic, providing stronger contact reliability and improved switching capability. The module is epoxy-sealed to prevent moisture contamination and includes 250 Vrms arc suppression protection to extend contact life when switching inductive loads such as solenoids or motor starters.
| Item | Specification |
|---|---|
| Part Number | 125712-01 |
| Module Type | 4-Channel Relay Monitor |
| Relay Configuration | 4 Channels; 2 SPDT relays per channel (DPDT logic) |
| Contact Rating | 5 A @ 24 Vdc or 120 Vac (resistive) |
| Contact Durability | 100,000 cycles |
| Power Consumption | 6 W |
| Operating Temperature | -30°C to +65°C |
| Dimensions | 2.6 cm × 25.2 cm × 24.1 cm |
| Weight | 1.75 kg |
The 3500/32 (125712-01) is commonly used in:
Steam turbine and gas turbine protection systems
Centrifugal compressor shutdown logic
Large industrial fan and blower protection
Fuel valve and safety solenoid control
Typical functions include driving:
Emergency shutdown circuits
Local alarm horns and beacon systems
DCS/PLC safety interlock inputs
Can the 125712-01 be configured for Normally Energized operation?
Yes. Each relay channel can be individually configured for Normally Energized (fail-safe) or Normally De-energized operation using rack configuration software. In fail-safe mode, relay outputs de-energize if system power is lost.
Is this module compatible with the 3500/34 TMR system?
The 125712-01 is typically used in simplex or non-voting architectures. The 3500/34 module is specifically designed for Triple Modular Redundant (TMR) safety voting logic applications.
