Technical Specifications Input Signal: Pulse signal from magnetic pickup speed probe Input Channels: Multi-channel speed input Measuring Speed Range: 0~20000 rpm Response Time: Fast overspeed detection Operating Temperature: 0℃ ~ +60℃ Storage Temperature: -40℃ ~ +85℃ Power Supply: Supplied by 3500 rack backplane Dimension: Standard single-slot plug-in module
Functional Features High precision rotational speed calculation from pulse input. Overspeed warning and trip threshold configurable. Real-time speed value upload to system and upper DCS. Built-in self-diagnosis for speed probe and cable fault. Front panel LED for channel status and overspeed alarm. Hot-swap support for online maintenance.
Application Scenarios Overspeed protection for steam turbine and gas turbine. Rotational speed monitoring of centrifugal compressors. Power generator unit speed protection system. Large industrial fan and pump speed supervision. Petrochemical rotating machinery overspeed interlock protection.
Structural Characteristics Standard single-slot plug-in design matching Bently 3500 rack. Front panel LED indicators for power, channel and overspeed alarm. Front screw terminal block for speed probe signal wiring. Backplane golden finger for rack bus communication and power supply. Metal shielding housing and rack locking latch.
Working Principle Magnetic speed probe generates pulse signal as gear tooth passes probe tip. The module captures pulse signal, counts pulse frequency and calculates real-time shaft rotating speed. The measured speed is compared with preset warning and trip threshold. When speed exceeds threshold, alarm and trip signal will be generated and sent to relay module and rack system. The diagnostic circuit monitors pulse signal integrity continuously.
Installation Requirements Insert module into designated slot of Bently 3500 rack. Connect magnetic pickup probe signal cable to front terminals. Set gear tooth number, overspeed warning and trip threshold by Bently software. Use shielded twisted pair cable for speed probe wiring. Separate signal cable from high voltage power cable. Complete system calibration after installation.
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