Product Introduction: 3500/40 176449-01 + 125680-01
This entry refers to a Relay Module for the Bently Nevada 3500 Machinery Protection System, comprised of two essential parts:
176449-01: This is the 3500/40 Relay Module itself, which houses the electronics and logic.
125680-01: This is the specific four-channel relay trip cartridge that plugs into the 3500/40 module frame.
The 3500/40 module provides critical, hardwired safety outputs. Its primary function is to act upon decisions made by the monitoring modules (e.g., vibration, speed, temperature). When an alarm or danger (trip) condition is detected, the 3500/40 activates its internal electromechanical relays to shut down the machine (via a trip relay) or alert operators (via an alarm relay), thereby preventing catastrophic damage.
Detailed Parameters & Specifications
The following table summarizes the key specifications of this assembly:
| Parameter Category | Specification Details |
|---|---|
| Assembly Part Numbers | Module: 176449-01 (3500/40) Relay Cartridge: 125680-01 (4-Channel) |
| Functional Designation | 3500/40 Relay Module with 4-Form-C Relay Cartridge |
| Physical Dimensions (H x W x D) | Approximately 200 mm x 60 mm x 220 mm (Standard 3500 series 4-channel module slot size) |
| Weight | Approximately 1.1 kg (2.4 lbs) for the complete assembly (module + cartridge). |
| Power Requirements | Powered from the 3500 rack backplane. Relay coils are typically powered by a separate user-supplied voltage. |
| Operating Temperature | -30°C to +65°C (-22°F to +149°F) |
| Relay Configuration (Cartridge 125680-01) | Four independent relays. Contact Type: Form-C (SPDT - Single Pole, Double Throw). Contacts: Common (C), Normally Closed (NC), Normally Open (NO). |
| Relay Ratings | Typical Rating: 5 A, 250 VAC / 30 VDC resistive. Specific ratings depend on the cartridge; this is a common configuration. |
| Isolation | 1500 V RMS channel-to-channel and channel-to-ground isolation for safety and noise immunity. |
| Input Logic | Accepts trip/alarm logic signals from other 3500 monitoring modules via the rack backplane. Configurable for latching or non-latching operation. |
| LED Indicators | Per-channel LEDs for Power, Relay Active/De-energized, and Fault status. |
| Primary Function | To provide configurable, failsafe relay outputs for machinery shutdown (trip) and alarm annunciation based on condition monitoring inputs. |
Primary Application Scenarios
The 3500/40 Relay Module is deployed in all scenarios where automatic machine protection or operator alerting is required:
Critical Machine Trip Protection:
Key Application: The primary use is to safely shut down turbines, compressors, and pumps when a monitoring channel (e.g., vibration, axial position, speed) reaches a Danger (Trip) setpoint. The relay de-energizes to break the safety circuit, triggering an Emergency Shutdown (ESD).
Alarm Annunciation:
Key Application: Activates warning lights, horns, or control system inputs when an Alert (Alarm) setpoint is exceeded. This provides early warning to operations and maintenance personnel of deteriorating machine condition, allowing for planned intervention.
Redundant (Voting) Trip Systems:
Key Application: In high-availability systems, multiple 3500/40 relays can be configured in 2-out-of-3 (2oo3) or other voting logic. This prevents unnecessary trips from a single sensor failure while maintaining protection against genuine faults, enhancing system reliability.
Sequencing & Control Logic:
Key Application: Relay outputs can be used to control auxiliary equipment based on machine state. For example, initiating a lube oil pump on startup signal or isolating a compressor section after a trip.
Failsafe System Interface:
Key Application: Provides a robust, hardwired interface between the electronic monitoring system and the plant's primary safety instrumented system (SIS) or turbine control system. The de-energize-to-trip design is a failsafe standard.
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