Description
Bently Nevada 3500/32 Four‑Channel Programmable Relay Module for 3500 Machinery Protection Rack, API 670 Compliant
Product Introduction
The Bently Nevada 3500/32 is a 4‑channel programmable relay module inside the classic 3500 machinery protection system rack. It receives alarm, danger and module OK status signals from all monitoring cards in the rack via the backplane, and drives 4 independent SPDT relay outputs according to user‑defined AND / OR voting logic. Each relay can be freely assigned to vibration, axial thrust, speed, temperature and other monitoring channels in the whole rack. Latching / non‑latching relay action modes are selectable to avoid false trips caused by single sensor fault. It directly sends hardwired trip signals to turbine ESD systems, local alarm panels and DCS remote status indication. Widely installed on steam turbines, centrifugal compressors and large rotating equipment, the 3500/32 is a high‑demand spare part for petrochemical, power plant rotating machinery protection cabinet maintenance.
Specific Application Information
- Machine danger trip output: Trigger emergency shutdown circuits when vibration, thrust position or overspeed reaches danger setpoint.
- Pre‑alarm signal output: Activate local audible & visual alarm for alert‑level abnormal machinery conditions.
- Multi‑channel voting logic: Realize two‑out‑of‑three voting to reduce false trips for critical protection loops.
- System fault notification: Relay action when any monitor module loss, sensor break or rack power failure occurs.
- DCS hard‑wired status feedback: Transmit machinery alarm and trip status to plant distributed control system via dry contacts.
- Local alarm annunciator drive: Connect to on‑site cabinet alarm lamps and buzzers.
- Auxiliary interlock linkage: Interlock with lube oil system, anti‑surge controller and other skid protection logic.
- API 670 machinery protection configuration: Form a complete compliant protection system when matched with vibration and position monitor modules.
3500/32
Technical Parameters
| Parameter | Specification |
|---|---|
| Model | 3500/32 |
| Manufacturer | Bently Nevada (Baker Hughes) |
| Channel Count | 4 independent relay channels |
| Relay Type | SPDT Form‑C dry contact |
| Contact Rating | 5A @ 250 VAC / 5A @ 30 VDC |
| Logic Configuration | AND / OR combinational logic, latching / non‑latching optional |
| Power Supply | Powered by 3500 rack backplane power supply module (3500/15) |
| Typical Power Consumption | 3.5 W |
| Response Time | ＜ 2 ms |
| Mounting | Hot‑swap slot installation in 3500 14‑slot rack |
| Operating Temperature | -40°C ~ +70°C |
| Relative Humidity | 5% – 95%, non‑condensing |
| Vibration Resistance | Epoxy sealed board for anti‑vibration in machinery cabinet |
| Certification | API 670 compliant, SIL2 capable in certified system configuration |
Main Features
✅ 4 fully independent SPDT relay outputs: Each relay can be assigned to any monitoring channel of the whole rack. ✅ Flexible AND / OR voting logic: Prevent false shutdown caused by single sensor failure for high‑reliability protection. ✅ Selectable latching function: Maintain trip status until manual reset for post‑trip fault investigation. ✅ Hot‑swap replaceable: Module can be swapped without powering down the whole 3500 rack. ✅ Backplane powered: No separate external power wiring required. ✅ Wide environmental adaptability: Wide temperature range, anti‑vibration PCB suitable for compressor and turbine field cabinets. ✅ Complete front‑panel LED indicators: Real‑time display of relay actuation, module run and fault status. ✅ API 670 compliance: Meets petroleum industry machinery protection specification for critical rotating assets.
Application Scenarios
- Oil & Gas Refineries: Centrifugal compressor and steam turbine vibration & thrust protection trip output.
- Thermal Power Plants: Steam turbine, boiler feed pump and induced draft fan machinery protection system.
- LNG Terminals: Large refrigerant compressor safety interlock and alarm signalling.
- Chemical Process Plants: High‑speed rotating equipment condition alarm and emergency shutdown.
- Pulp & Paper Mills: Turbine‑driven paper machine rotating machinery monitoring & protection.
- Offshore Platforms: Gas compressor skid machinery protection rack relay output.
- Pipeline Pump Stations: Large pump vibration alarm and trip protection.
Supporting Components
- 3500 series rack and backplane
- 3500/15 rack power supply module
- Rack interface module (3500/20 / 3500/22M)
- Vibration / position monitor modules: 3500/40M, 3500/42M, 3500/45
- Proximitor sensors, velocity sensors, Keyphasor speed pickup
- 3500 Rack Configuration Software for relay logic programming
- Trip relay cabinet, alarm annunciator panel
- Dry‑contact signal cables to DCS and ESD system
- Terminal blocks for relay contact wiring
3500/32 125720-01
Related Series Models (Bently Nevada 3500 System Family, 8 Models)
- 3500/32 — 4‑Channel Relay Module (Target Item)
- 3500/33 — 16‑Channel Relay Output Module
- 3500/40M — 4‑Channel Proximitor Vibration & Thrust Monitor
- 3500/42M — Proximitor / Seismic Vibration Monitor
- 3500/25 — Keyphasor Speed & Phase Module
- 3500/22M — Transient Data Interface Module
- 3500/92 — Modbus TCP Communication Gateway
- 3500/15 — Rack Power Supply Module
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