Liebert Emerson 02-790889-02 REV.1 System V&I Conditioner Circuit Board

The Liebert / Emerson 02-790889-02 Rev. 1 System V&I Conditioner Board is a precision signal-conditioning circuit used in Liebert UPS and power monitoring systems. It stabilizes, filters, and scales voltage and current input signals for accurate monitoring and control. Manufacturer: Emerson Network Power (Liebert brand) Model / Part No.: 02-790889-02 Rev. 1 Type: System Voltage and Current Conditioner PCB Function: Signal conditioning and isolation for voltage (V) and current (I) measurement channels Input Channels: • Voltage input: up to 600 VAC (through scaling resistors / divider network) • Current input: up to 5 A AC (via CT interface) Output: Scaled analog signals (typically 0–5 VDC or 4–20 mA) for system controller input Power Requirement: 24 VDC nominal (from control system supply) Connectors: • Multiple pluggable terminal blocks (for voltage, current, and power connections) • 10-pin header for control board interface Circuit Components: • Precision resistors and filter capacitors for signal shaping • Opto-isolators and operational amplifiers for signal linearization • Fuse protection for high-voltage inputs • Status LED indicators for channel operation (on some revisions) PCB Material: FR-4, 94V-0 rated industrial epoxy laminate Board Dimensions: Approx. 6 in × 4 in (150 × 100 mm) Mounting: Standoff holes for chassis or rack installation Applications: • Liebert UPS system monitoring • Voltage and current feedback conditioning • Power distribution system diagnostics • Industrial control signal scaling and isolation Country of Origin: USA Please review pictures carefully and let us know if you have any questions!