Liebert Emerson 02-796912-00 REV.5 P/L63 SCR Sensor Board

The Liebert Emerson 02-796912-00 REV.5 P/L63 SCR Sensor Board is a precision monitoring and feedback circuit designed for detecting and conditioning SCR (Silicon Controlled Rectifier) signals in Liebert UPS and power conversion systems. It ensures accurate voltage and current sensing for the SCR gate and anode-cathode circuits, providing real-time feedback for control logic and fault protection. Technical Description: Manufacturer: Liebert / Emerson Network Power Model / Part Number: 02-796912-00 Revision: 5 Type: P/L63 SCR Sensor Board Function: Monitors and conditions SCR conduction and trigger signals; transmits feedback to UPS control logic Input Voltage: 24VDC (logic/control supply) Signal Channels: Dual or quad SCR sensor channels (depending on system configuration) Key Components: • Precision operational amplifiers for voltage and current feedback amplification • High-speed optocouplers for isolation between power and control circuits • Signal diodes and zener regulators for input protection • Multi-turn trimmer potentiometers for calibration • Resistor-capacitor (RC) networks for noise filtering and signal smoothing Interface: • Green terminal block for SCR sense inputs (up to 8 screw terminals) • Two multi-pin headers for system and control board interfacing • Auxiliary power connector for board excitation voltage Protection Features: • Overvoltage and reverse polarity protection • Channel-to-channel isolation • Transient suppression across signal lines PCB Material: FR4 epoxy glass laminate Mounting: Subpanel or chassis mount with standoffs Dimensions (approx.): 120 mm × 100 mm Operating Temperature: 0°C to +70°C Applications: • Liebert UPS SCR monitoring and diagnostics • Inverter and rectifier SCR conduction feedback • Phase angle control feedback loops • Overcurrent and fault detection systems Compliance: UL Recognized, CE Certified Please review pictures carefully and let us know if you have any questions!