The Bently Nevada 149986-02 is the Spare 4-Channel Relay Control Module for the 3500/32M Relay Module in the 3500 Machinery Protection System. It is the front-panel main card that processes alarm states and executes programmable voting logic, driving the rear I/O module ( 125720-01 or 125720-02) to switch external alarm, trip, and shutdown circuits.
Item No :
149986-02Order(MOQ) :
1 PiecePayment :
EXW/CIFProduct Origin :
USAShipping Port :
WuhanLead Time :
3-5daysWeight :
3kg| Specification | Description |
|---|---|
| Manufacturer | Bently Nevada (Baker Hughes) |
| Model | 3500/32M |
| Spare Part Number | 149986-02 |
| Product Type | 4-Channel Relay Control Module (Front Card) |
| Compatible I/O Modules | 125720-01 (standard) / 125720-02 (hazardous/SIL) |
| Number of Relays | 4 independent channels |
| Relay Type | Single-pole, double-throw (SPDT), epoxy-sealed |
| Arc Suppressor | 250 Vrms, installed as standard |
| Contact Life | 100,000 cycles @ 5 A, 24 Vdc or 240 Vac |
| Power Consumption | 5.8 W typical |
| Functional Safety | SIL 2 capable |
| Hazardous Area Approvals | ATEX/IECEx/CSA (Class I, Zone 2); cNRTLus (Class I, Div 2) |
| Operating Temperature | -30°C to +65°C (-22°F to +150°F) |
| Storage Temperature | -40°C to +85°C (-40°F to +185°F) |
| Humidity | 95%, non-condensing |
| Dimensions (H x W x D) | 241 mm x 24.4 mm x 242 mm |
| Weight | 0.7 kg (1.6 lb) |
| Lifecycle Status | Active / Available as New Surplus |
| Model | Description | Typical Application |
|---|---|---|
| 149986-02 (this model) | Spare 4-Channel Relay Control Module (front card) | 3500/32M relay logic and voting |
| 125712-01 | 4-Channel Relay Module (main card for standard 3500/32) | Legacy 3500/32 applications (not interchangeable with 149986-02) |
| 125720-01 | Spare 4-Channel Relay I/O Module (standard) | Repair/replacement for standard systems |
| 125720-02 | Spare 4-Channel Relay I/O Module (hazardous/SIL) | SIL-certified and hazardous area applications |
| 3500/32-01-01 | Complete 4-Channel Relay Module (cNRTLus) | North American Class I Div 2 installations |
| 3500/32-01-02 | Complete 4-Channel Relay Module (ATEX/IECEx) | International hazardous area installations |
| 3500/22M | Transient Data Interface (TDI) | Required companion module for 3500/32M |
Q1: What is the primary function of the 149986-02?
It is the front-panel relay control module for the 3500/32M 4-Channel Relay Module. It receives alarm states from monitoring modules in the rack, processes programmable voting logic (Alarm Drive Logic), and drives the rear I/O module to switch external alarm, trip, and shutdown circuits .
Q2: Can the 149986-02 replace the 125712-01?
No. The 149986-02 is the spare for the upgraded 3500/32M and supports SIL 2 and hazardous area certifications. The 125712-01 is the main card for the standard 3500/32 and lacks these certifications. They are fully non-interchangeable — installing a 149986-02 in a legacy 3500/32 causes functionality issues, while using a 125712-01 in a 3500/32M compromises safety certifications .
Q3: What firmware and software versions are required for the 149986-02?
The 3500/32M requires:
3500/22 TDI module with firmware Rev 1.71 or later
3500 Rack Configuration Software version 4.5 or later
3500 Data Acquisition Software version 2.40 or later
3500 Data Display Software version 1.40 or later
Q4: Can the 149986-02 be hot-swapped?
No. The field wiring terminal blocks must be disconnected and the slot area de-energized before extraction. Removing the module under active load can disrupt safety voting loops and trigger false emergency trips. Always follow proper ESD precautions and verify the replacement module's configuration matches the original .
Q5: What are the common diagnostic alerts for this module?
Common alerts include:
Module Not OK: Internal self-diagnostic failure, often due to aging relay coils
Relay Fault: Channel fails to actuate, often from external wiring shorts or contact wear
Relay Readback Mismatch: Contact welding (often caused by inductive load kickback without surge suppression) or coil degradation
Watchdog Timeout: Backplane communication break, often from firmware version mismatches
The Bently Nevada 3500/60-01-00 is a 6-Channel Temperature Monitor for the 3500 Machinery Protection System. The complete configuration consists of the 163179-01 Temperature Monitor (main card) and the 133819-01 RTD/TC I/O Module with internal terminations.
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The Bently Nevada 3500/53-03-00 is a Single-Channel Electronic Overspeed Detection Module for the 3500 Machinery Protection System, configured with the 133388-01 Overspeed Detection main card and the 133396-01 Overspeed Detection I/O Module.
he Bently Nevada 288062-02 is the Tachometer Module main card for the 3500/50M Tachometer Module in the 3500 Machinery Protection System. It is a dual-channel module that accepts input from proximity probes or magnetic pickups to determine shaft rotational speed, rotor acceleration, and rotor direction.
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