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ICM492D Single-Phase Digital Line Voltage Monitor

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ICM492D Single-Phase Digital Line Voltage Monitor

Product Overview

ICM492D is a microprocessor-based, single-phase line voltage monitor that continuously displays true-RMS voltage on a backlit digital screen. It protects equipment against over- and under-voltage conditions, rapid short cycling, and transient interruptions by switching an SPDT dry-contact relay based on user-programmed thresholds. Equipped with a 5-fault memory, it records and displays the highest and lowest voltage faults for streamlined troubleshooting.


Technical Specifications

Specification Detail
Line voltage input 80–300 VAC, 50/60 Hz
Display Backlit digital RMS voltage
Voltage setpoint range 95–280 VAC (user adjustable)
Over/Under voltage setting Adjustable 5–25% above/below setpoint
Anti-short cycle time delay 0–720 sec (user adjustable)
Response time 0.1–10 sec (user adjustable)
Fault memory Stores last five faults
Control voltage input 18–240 VAC optional for thermostat integration
Relay output SPDT dry contacts; N.C./N.O. contacts rated 10 A resistive @ 277 VAC
Operating temperature –40 °C to +70 °C
Storage temperature –40 °C to +85 °C
Humidity Up to 95% non-condensing
Case dimensions 3″ L × 3.2″ W × 1.35″ H
Weight 0.36 lb

 


Cross-Reference Part Numbers

Part Number Description
ICM492D Current single-phase digital voltage monitor
ICM492 Original revision
ICM492A/B/C Previous firmware/hardware revisions


Compatibility

  • Single-phase motors, compressors, pumps, and HVAC equipment

  • Applications requiring precise protection against voltage anomalies

  • Direct drop-in upgrade for ICM492 and legacy digital line monitors


Technician Notes

  1. Disconnect all power before servicing.

  2. Mount the ICM492D securely to the equipment chassis in a dry, accessible location.

  3. Wire L1 and L2 to the line voltage terminals; connect optional control voltage (18–240 VAC) if thermostat integration is needed.

  4. Use the UP, DOWN, and SELECT buttons to set nominal voltage, over/under percentages, response time, and anti-short-cycle delay.

  5. Verify the digital display with a true-RMS meter; calibrate via the menu if required.

  6. Initiate a load; confirm COM-to-N.O. closes at the setpoint and COM-to-N.C. closes on fault.

  7. Clear fault history by pressing UP + DOWN + SELECT simultaneously.

  8. Periodically review fault memory to diagnose recurring voltage issues.


Additional Resources

  • ICM Controls ICM492D Installation & Programming Guide (PDF)

  • Printable voltage monitor cross-reference sheet