Description
Emerson SI3120
Technical Specifications: Operating voltage 24VDC. Input signal type: pulse signal from speed probe. Measurable speed range 0 ~ 20000 RPM. Operating temperature -40°C ~ +70°C. Support phase reference signal acquisition.
Functional Features: Real-time rotating speed calculation. Shaft phase angle measurement. Overspeed alarm and overspeed trip logic. Probe and cable fault diagnosis. LED indicators for running, alarm and fault. Time sequence event recording.
Application Scenarios: Steam turbine overspeed protection, centrifugal compressor speed monitoring, generator shaft phase measurement, large fan rotation monitoring, oil & gas rotating machinery protection.
Performance Parameters: Speed measurement accuracy ±1 RPM. Response time for overspeed trip less than 10ms. MTBF 430000 hours. Pulse input frequency range 0 ~ 10kHz.
Material Composition: FR-4 flame retardant printed circuit board. UL94-V0 plastic housing. Pulse shaping circuit, high speed counter chip, surge protection components, gold-plated terminal connectors.
Structural Features: Standard rack plug-in module for CSI rack. Front panel with LED indicator group. External terminal block for speed probe wiring. Internal electromagnetic shielding structure.
Working Principle: Speed probe generates pulse signal when gear tooth passes probe head. SI3120 module receives pulse signal and shapes waveform. High-speed counter calculates pulse frequency and convert value to rotating speed. Module compares measured speed with preset alarm and trip threshold. When overspeed condition occurs, module activates trip output and records time stamped event.
Installation Requirements: Install in CSI machinery monitoring cabinet. Use shielded twisted pair cable for speed probe connection. Separate signal cables from high voltage power cables. Ensure good cabinet grounding.
Usage Notes: Verify probe installation gap before commissioning. Avoid strong electromagnetic interference near speed signal cables. Perform overspeed function test after installation.
