BENTLY 3500/53M multi-channel electronic overspeed protection module

The BENTLY 3500/53M is an advanced multi-channel electronic overspeed protection module within Bently Nevada’s 3500 Series Rotating Machinery Protection & Monitoring System. Designed to enhance safety and reliability for critical rotating equipment (e.g., steam turbines, gas turbines, and large compressors), the "M" designation indicates enhanced sensor compatibility and multi-parameter monitoring capabilities, making it suitable for complex industrial environments requiring redundant overspeed protection. Below is its comprehensive detailed information:

1. Core Functions and Purpose

The 3500/53M serves as a dedicated safety module focused on real-time overspeed detection, rotational parameter monitoring, and emergency protection triggering. It continuously measures shaft speed, identifies overspeed conditions exceeding safe thresholds, and outputs trip signals to shut down equipment, preventing catastrophic failures (e.g., turbine blade damage or explosions due to excessive centrifugal force). Beyond overspeed protection, it integrates auxiliary monitoring features such as rotation direction verification and acceleration/deceleration tracking, providing a holistic view of rotational safety.

2. Technical Parameters

Category	Specific Specifications
Speed Measurement	- Range: 0 rpm to 20,000 rpm (configurable up to 100,000 rpm for high-speed machinery)- Accuracy: ±0.05% of reading (full range), ensuring precise threshold triggering- Response Time: <8 ms (from overspeed detection to trip signal output), critical for rapid accident prevention- Events per Revolution: 1 to 255 (programmable, matching gear teeth, shaft markers, or encoder pulses)
Sensor Compatibility	- Supported Sensors: Eddy current proximity probes (e.g., 3300XL series), magnetic pickups, and digital encoders- Input Signal Range: ±24 V DC (with internal clamping to protect against overvoltage)- Input Impedance: ≥20 kΩ (minimizing signal attenuation)- Redundant Sensor Support: Up to 4 independent sensor inputs (enabling 2-out-of-3 voting logic)
Output Configuration	- Relay Outputs: 6 Form C (SPDT) relays (configurable for "Overspeed Warning," "Overspeed Trip," "Sensor Fault," "Direction Error," etc.); max switching voltage: 250 V AC / 30 V DC; max current: 5 A- Analog Outputs: 2 channels of 4-20 mA DC (proportional to speed, acceleration, or diagnostic data)- Buffered Outputs: 4 channels (1:1 replication of sensor signals for external verification/logging); impedance: 550 Ω
Power & Environment	- Power Supply: +24 V DC (from 3500 rack backplane); typical current: 0.8 A; max power: 9.6 W- Operating Temperature: -40°C to +85°C (suitable for extreme industrial environments)- Humidity: 5% to 95% (non-condensing)- Protection Rating: IP20 (dust-proof, cabinet-mounted)- EMC Compliance: IEC 61000-4-2 (ESD), IEC 61000-4-6 (EFT)
Safety Standards	- Compliance: API 670, API 612, IEC 61508 SIL 3 (Safety Integrity Level 3), ensuring suitability for safety-instrumented systems (SIS)- Voting Logic: Supports 2-out-of-2 (2oo2), 2-out-of-3 (2oo3), or 1-out-of-2 (1oo2) configurations to prevent false trips or missed faults