Description
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Product Introduction
When your Bently Nevada 3500 large rotating machinery protection system needs ultra-reliable safety interlock output performance to ensure that the equipment can trigger the protection trip action in time when abnormal vibration, temperature or overspeed occurs, this module acts as the core protection output hub.
It is a flagship relay output module for Bently Nevada 3500 series machinery protection systems, with 8 configurable universal analog input channels that support 4-20mA, mV, RTD and J/K/T/E/R/S/B type thermocouple signals, and 4 independent high-power relay output channels. Each relay contact can carry 5A current under 250VAC/30VDC conditions, and the per-channel sampling rate is up to 100Hz, with measurement accuracy as high as ±0.1% of reading. It is powered by the 3500 series rack backplane 5VDC and ±15VDC, with power consumption of 6-8W. Its industrial-grade reinforced design fully adapts to harsh industrial site environments, making it a core replacement part for Bently Nevada 3500 machinery protection system maintenance and retrofit projects.
3500-32
3500-32
Key Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 3500/32 (125712-01 / 125720-01 variants) |
| Product Type | Machinery Protection System Relay Output Module |
| Manufacturer | Bently Nevada (Baker Hughes) |
| Country of Origin | USA |
| Configurable Analog Input Channels | 8 channels |
| Supported Input Signal Types | 4-20 mA, mV, RTD, Type J/K/T/E/R/S/B thermocouple |
| Independent Relay Output Channels | 4 channels |
| Relay Contact Rating | 5 A @ 250 VAC, 5 A @ 30 VDC per channel |
| Per-Channel Sampling Rate | Up to 100 Hz |
| Analog Input Measurement Accuracy | ±0.1% of reading |
| Temperature Input Measurement Accuracy | ±0.5°C |
| Power Supply | 5 VDC, ±15 VDC (powered by 3500 series rack backplane) |
| Power Consumption | 6–8 W (varies by specific variant) |
| Operating Temperature Range | 0°C ~ +60°C (32°F ~ 140°F) |
| Installation Method | Standard 3500 series machinery protection rack slot mounting |
| Compatible Systems | Bently Nevada 3500 series machinery protection systems |
| Net Weight | ~0.6 kg |
| Safety Certification | SIL 2 certified for machinery protection applications |
Field Application & Technical Pitfalls
Critical Industrial Scenarios
- **Large Thermal Power Plant Steam Turbine Protection System: Acts as the core protection interlock output unit for Bently Nevada 3500 turbine protection systems, outputting vibration over-limit, overspeed and temperature abnormal trip signals to ensure the safe operation of large steam turbine units.
- **Petrochemical Large Centrifugal Compressor Protection System: Delivers reliable high-power relay output performance for petrochemical large compressor protection systems, adapting to strong electromagnetic interference and high-vibration industrial environments, meeting the zero-misoperation safety operation requirements of large rotating equipment.
- **Metallurgical Large Rolling Mill Main Drive Motor Protection: Adapts to high-temperature and high-dust metallurgical workshop environments, providing stable protection interlock output support for the core vibration protection system of large rolling mill main drive motors.
Non-Negotiable Technical Pitfalls
- ⚠️ Bold Warning 1: Never arbitrarily use non-matching non-Bently Nevada standard signal wiring terminals. The third signal channel will experience contact resistance deviation that causes the protection signal to fail to trigger normally.
- ⚠️ Bold Warning 2: Skipping the pre-commissioning full relay action test will leave you with hidden protection refusal risks. This module must confirm all 4 relay channels’ action functions fully meet machinery protection safety specifications before putting into operation.
- ⚠️ Bold Warning 3: Do not perform hot-swap operation while the rotating machinery protection system is running. Unexpected protection output interruption during the swap will cause the safety interlock function to fail, resulting in serious equipment safety hazards.
A large thermal power plant maintenance team once swapped a Bently Nevada 3500/32 module and skipped the relay action test. The hidden single relay contact poor contact caused the turbine vibration over-limit protection to fail to trigger, resulting in a 2-hour emergency shutdown of the 300MW unit.
Quality Control (QC) SOP & Transparency
- Inbound Verification: Cross-check the OEM serial number against Bently Nevada’s official 3500 machinery protection part registry, confirm the part number 3500/32 matches the factory label, and inspect no bent pins or corrosion on all backplane and signal connectors.
- Live Rig Testing: Power the unit in a calibrated Bently Nevada 3500 system test bench, apply standard analog reference signals, and confirm full 2-hour continuous stable operation.
- Parameter Testing: Verify all 8 analog input channels operate correctly, confirm all 4 relay output channels’ action functions meet factory specifications, and validate all status LED indicators and fault diagnosis functions work properly.
- Final QA & Packaging: Seal the tested module in a static-shielding anti-static bag, attach a unique QC passed serial label, and nest it in foam padding inside a rigid industrial safety-grade shipping carton.
Frequently Asked Questions (FAQ)
- Can I hot-swap this module while the machinery protection system is running? No. You must first set the corresponding protection function to maintenance blocking state and confirm the redundant protection channel is operating normally before removing the unit, otherwise you will trigger unexpected safety interlock function failure risks.
- What exact systems is this module compatible with? It works natively with Bently Nevada 3500 series machinery protection systems, and cannot be directly used in non-Bently Nevada machinery protection systems without custom adaptation.
- How long is the standard warranty for this new surplus unit? 12 months from delivery. It covers all manufacturing defects, but does not extend to units damaged by miswiring, improper relay load matching, or overvoltage in the field.
- How do I tell a genuine OEM unit apart from a refurbished clone? Genuine Bently Nevada 3500/32 modules have a laser-etched part number on the PCB, not a printed sticker. Clone units almost always fail the full 4-channel high-power relay action performance test.
- What is the typical lead time for shipment? In-stock units ship within 48 hours. If you require official Bently Nevada factory machinery protection performance test documentation, add 2 extra business days to the turnaround window.
- Can this module replace the older Bently Nevada legacy 3500 series relay unit? Well, technically it fits the same standard 3500 rack slot footprint, but you must confirm the 3500 system firmware version fully matches the target protection system before replacement to ensure 100% system compatibility.
