Description
At-A-Glance Executive Brief
- Model: 3500/33 149986-01
- Brand: Bently Nevada (Baker Hughes)
- Part Type: 16-channel relay control module for 3500 machinery protection rack
- Lifecycle status: EOL critical spare for rotating machinery protection; stocked for brownfield turbine, compressor, pump and heavy rotating equipment cabinet maintenance
- System compatibility: Bently Nevada 3500 Machinery Protection System; provides 16 independent SPDT relay outputs, programmed to execute alarm voting, alert and danger trip logic using vibration, speed, axial position, or Not-OK signals from all monitor channels inside the 3500 rack
- Weight: ~0.4 kg
Technical Introduction
Failure of the 3500/33 149986-01 relay module disables all 16 programmable relay outputs. Machinery alarm and trip relay functions will no longer activate for high vibration, thrust position fault or speed abnormal conditions. Rotating equipment loses hardwired safety trip capability, creating severe machine damage risk, process safety hazards and forced plant shutdown for power generation, oil & gas and petrochemical facilities.
Bently Nevada 3500/33 149986-01 is a full-height 16-channel relay module designed for the Bently Nevada 3500 machinery protection rack. Each channel uses epoxy-sealed SPDT relay contacts with built-in arc suppression. Every relay can be independently configured via 3500 rack configuration software with AND/OR voting logic, latching function and selection between normally energized or normally de-energized fail-safe operation. It can reference Alert, Danger and Not-OK status from any monitor module within the same rack. This hardware delivers hardwired relay outputs to local annunciators, PLC inputs and emergency trip circuits for turbines, centrifugal compressors and large critical pumps. Plant reliability teams stock 3500/33 149986-01 to restore machine protection relay logic for legacy 3500 racks.
- Best Suited For
- Bently Nevada 3500 machinery protection racks for gas/steam turbines, compressors, large rotating equipment in power, oil & gas and petrochemical plants
- 16 channel configurable relay alarm and machine trip voting logic, hardwired safety interlock output
- Direct drop-in replacement for existing Bently Nevada 3500/33 149986-01 relay module hardware
Core Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 3500/33 149986-01 |
| Manufacturer | Bently Nevada (Baker Hughes) |
| Product Type | 16-Channel SPDT Relay Control Module |
| Relay Type | Single-Pole Double-Throw (SPDT), epoxy sealed, built-in arc suppressor |
| Contact Rating | Max 6A, 250VAC resistive |
| Logic Function | Independent per-channel AND/OR voting, latching relay, NE/ND group selection |
| Input Source | Alert / Danger / Not OK signals from all 3500 rack monitor modules |
| Power Consumption | Typical 5.8W from rack backplane 24VDC |
| Local Indicators | OK LED, TX/RX communication LED, individual channel alarm LEDs |
| Operating Temperature | -30℃ ~ +65℃ |
| Humidity | 5–95% RH non-condensing |
| Weight | ~0.4 kg |
| Environmental Details | Please refer to Bently Nevada 3500/33 hardware manual for EMC, shock and vibration specifications for turbine/compressor control cabinet environments. |
Field Engineer’s Tech Notes
- Confirm full part number revision, 3500 rack firmware version, relay logic configuration backup and rear I/O terminal base matching before replacement; firmware mismatch or wrong terminal base will lead to communication failure or incorrect trip logic.
- Implement machine safety bypass and lockout-tagout for all critical rotating machinery trip circuits before removing the relay module. Loss of relay function removes hardwired machine protection.
- Inspect rack backplane connectors, rear wiring terminal block, cabinet cooling fans and dust filters; loose wiring and backplane connection degradation are common causes of intermittent relay faults.
- After installation, verify 24VDC rack power-up, module OK status, rack backplane communication, download saved relay voting configuration. Perform relay channel functional test, simulate alarm/danger trigger to verify relay actuation, clear faults and remove safety bypass before returning rotating equipment online.
- ESD protection required while handling the module.
- Backup relay logic configuration and conduct relay contact functional test during machinery protection system preventative maintenance.
Adaptive QA & Testing Protocol
Each Bently Nevada 3500/33 149986-01 relay module is bench tested on 3500 test rack. We verify 24VDC power boot, rack communication, 16-channel relay actuation test, alarm logic simulation and front panel diagnostic LED operation. PCB, edge connector and relay components are visually inspected for burn marks, corrosion or thermal damage. Full test reports are available upon request.
Buyer’s FAQ
Q: What is Bently Nevada 3500/33 149986-01 used for? A: It is a 16-channel relay module for Bently Nevada 3500 machinery protection racks, providing programmable SPDT relay outputs for vibration alarms and rotating equipment safety trip voting logic.
Q: What warranty applies for refurbished and NSFP 3500/33 149986-01? A: Refurbished and NSFP units carry a 12-month hardware warranty. Coverage excludes ESD damage, contact burnout, incorrect logic configuration, wiring errors and improper safety bypass.
Q: What lead time should I expect? A: Stocked units ship 3–7 business days. If inventory depleted, we source surplus Bently Nevada 3500/33 149986-01 relay modules.
Q: Can 3500/33 149986-01 be hot swapped? A: Hot swap is supported under specific 3500 rack operating conditions, but safety trip circuits must be bypassed before extraction to prevent unintended machine trip. Lockout-tagout is strongly recommended for high-risk turbine/compressor assets.
Q: Is 3500/33 149986-01 still in production? A: No, Bently Nevada 3500/33 series is end-of-life legacy machinery protection hardware.
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