Bently Nevada 3500/53 Overspeed Detection Module

The 3500/53 is a dedicated safety overspeed detection module for Bently Nevada 3500 TSI machinery monitoring rack, fully compliant with API 670 and API 612 safety standards for turbine and compressor overspeed protection. It receives pulse signals from proximity probes or magnetic pickups, calculates real-time rotational speed, and triggers fast-response relay trip signals once exceeding preset overspeed thresholds.

This safety-critical module supports hot-swap replacement without rack shutdown, and multiple units can form 2oo2 or 2oo3 voting logic to avoid false trips. Equipped with front panel LED indicators for power, communication and fault status, it adopts conformal coated PCB to resist damp, dust and vibration in power, petrochemical heavy industrial environments.

Main Specifications

• Brand: Bently Nevada (GE); Model: 3500/53; Series: 3500 TSI Machinery Monitoring System
• Signal Input: Single channel for proximity probe / magnetic pickup, signal range +10V ~ -24V, input impedance 20kΩ
• Relay Output: 4 independent fast-response relays for alarm, overspeed trip and run fault interlock
• Power Consumption: Typical 8W, single standard slot installation inside 3500 rack
• Voting Configuration: Supports 2-out-of-2 or recommended 2-out-of-3 redundant safety voting system
• Compatible Sensors: 3300 series proximity probes, 7200 series magnetic pickups
• Environment: Operating 0℃ ~ +60℃, storage -40℃ ~ +85℃, 5%–95% RH non-condensing, IP20 cabinet grade
• Diagnostics: OK & communication LED lights, built-in sensor wire break and module self-test function
• Certifications: API 670/612 overspeed safety standard, CE, industrial EMC compliant

Core Functions

• Collect pulse signals from speed sensors, convert pulse frequency into accurate RPM value for continuous rotating machinery speed monitoring.
• High-speed overspeed judgment logic outputs hard relay trip signals instantly to cut off equipment when rotational speed exceeds safety limit.
• Multi-module redundant voting architecture eliminates single module failure risks, greatly improving safety system reliability for critical units.
• Independent channel signal conditioning filters industrial electromagnetic interference, ensuring stable speed measurement under heavy converter & motor noise.
• Hot-swappable modular design allows single module replacement without stopping the whole TSI rack, reducing unit maintenance downtime.
• Real-time fault self-diagnosis detects broken sensor cables, module power loss and communication failure, and outputs visible LED alarm prompts.

Application Scenarios

• Safety overspeed spare replacement for 3500 TSI racks in thermal power steam turbines, gas turbines and generator sets.
• Overspeed protection spare parts for petrochemical centrifugal compressors, large fans and pipeline pump rotating equipment.
• Maintenance backup inventory for offshore oil platforms, metallurgical rolling mills and chemical plant high-speed rotating machinery control rooms.
• Matching safety monitoring accessory paired with 3500 rack power supply, proximity probes and emergency shutdown ESD systems.
• Retrofit replacement components for aging TSI monitoring systems suffering speed signal loss and overspeed trip failure faults.

• Global aftermarket spare stock for automation maintenance teams managing Bently Nevada 3500 series machinery protection equipment worldwide.