Introduction
The ICM Controls ICM402 is a robust three-phase line voltage monitor designed to provide critical protection for electrical systems. It continuously monitors for conditions such as phase loss, phase reversal, and voltage unbalance, ensuring the safe and reliable operation of connected equipment. This device is suitable for 50/60 Hz systems with a universal 3-phase input ranging from 190-600 VAC.
Key Features
- Provides 3-phase protection for single-sided applications.
- Monitors for phase reversal, phase loss, and percentage of unbalance as a function of the input voltage.
- Equipped with bright LED indicators for clear status display (ON and FAULT).
- Features a universal 3-phase input voltage range of 190-600 VAC.
- Supports control voltage inputs of 115, 208, or 240 VAC.
Specifications
| Model Number | ICM402 |
| Input Voltage | 190-600 VAC (3-Phase) |
| Control Voltage | 115, 208/240 VAC |
| Frequency | 50/60 Hz |
| Output Current (Y-OUT) | 30 Amps Max. |
| Product Dimensions | 4.5 x 4 x 2 inches |
| Weight | 6.56 ounces |
| Manufacturer | ICM Controls |
What's in the Box
The ICM402 package includes:
- One (1) ICM Controls ICM402 Three-Phase Line Voltage Monitor
Safety Information
WARNING: SHOCK HAZARD.
TURN OFF ALL POWER BEFORE SERVICING.
ALL TERMINALS MAY BE ENERGIZED.
Always ensure that power is disconnected at the source before attempting any installation, wiring, or maintenance on the ICM402 unit. Failure to do so can result in severe injury or death. This device should only be installed by qualified personnel in accordance with all local and national electrical codes.
Figure 1: ICM Controls ICM402 Unit Overview. This image displays the top view of the ICM402 monitor, highlighting its various terminals and labels. Key markings include:
- Y | Y-OUT (30 AMPS MAX.): Output terminal for the monitored circuit.
- C | 115 VAC | 230 VAC: Control voltage input terminals.
- FAULT / ON LEDs: Indicators for operational status and fault conditions.
- P/N ICM402 cRUus: Part number and safety certification.
- L1, L2, L3 (190-600 VAC): Three-phase line voltage input terminals.
- CUT WIRE FOR 50Hz: A red wire loop indicating a modification for 50Hz operation (if applicable).
- MADE IN THE USA: Country of manufacture.
The warning "SHOCK HAZARD: TURN OFF ALL POWER BEFORE SERVICING. ALL TERMINALS MAY BE ENERGIZED." is prominently displayed on the unit itself.
Installation and Setup
Proper installation is crucial for the correct operation and safety of the ICM402. Refer to Figure 1 for terminal identification.
- Power Disconnection: Before beginning any wiring, ensure that all power to the circuit where the ICM402 will be installed is completely disconnected and locked out.
- Mounting: Mount the ICM402 in a suitable electrical enclosure, ensuring adequate ventilation and protection from environmental factors.
- Three-Phase Input Wiring (L1, L2, L3): Connect the three-phase line voltage (190-600 VAC) to the L1, L2, and L3 terminals. Ensure correct phase sequence for proper monitoring of phase reversal.
- Control Voltage Wiring (C, 115 VAC, 230 VAC): Connect the appropriate control voltage (115 VAC or 208/240 VAC) to the 'C' terminal and the corresponding voltage terminal (115 VAC or 230 VAC). This powers the internal circuitry of the monitor.
- Output Wiring (Y | Y-OUT): Connect the monitored circuit's control input or contactor coil to the Y and Y-OUT terminals. This output is rated for 30 Amps maximum.
- Frequency Selection (50Hz/60Hz): The unit is factory set for 60Hz operation. If operating in a 50Hz system, locate the red wire loop labeled "CUT WIRE FOR 50Hz" and carefully cut it. Refer to Figure 1 for its location.
- Power Restoration: Once all wiring is securely connected and verified, restore power to the circuit.
Operation
Upon power-up, the ICM402 will begin monitoring the three-phase line voltage. The status of the system is indicated by the two onboard LEDs:
- ON LED: Illuminates when the unit is powered and operating normally, indicating that the monitored voltage is within acceptable parameters and no fault conditions are detected.
- FAULT LED: Illuminates when a fault condition is detected, such as phase loss, phase reversal, or voltage unbalance exceeding the factory-set thresholds. When the FAULT LED is on, the output relay will de-energize, protecting the connected equipment.
The unit automatically resets once the fault condition is cleared and the voltage returns to normal operating parameters.
Maintenance
The ICM402 is designed for maintenance-free operation. However, periodic visual inspection is recommended to ensure:
- All wiring connections remain secure and free from corrosion.
- The unit is free from dust, debris, or moisture accumulation.
- The enclosure provides adequate protection and ventilation.
Before any inspection or cleaning, always disconnect power to the unit.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Unit not powering on (no LEDs) | No control voltage supply; Incorrect control voltage wiring. | Verify control voltage (115, 208/240 VAC) is present and correctly wired to C and appropriate VAC terminal. Check fuses/breakers. |
| FAULT LED is ON continuously | Phase loss, phase reversal, or voltage unbalance detected. | Check all three phases (L1, L2, L3) for presence and correct voltage. Verify phase sequence. Check for significant voltage unbalance between phases. |
| Unit cycles between ON and FAULT | Intermittent power issue; Borderline voltage unbalance. | Monitor incoming power for stability. Consult an electrician to diagnose power quality issues. |
| Output (Y | Y-OUT) not activating | FAULT condition present; Incorrect wiring to controlled device. | Ensure no FAULT LED is illuminated. Verify wiring from Y/Y-OUT to the controlled device. Check the controlled device itself. |
If troubleshooting steps do not resolve the issue, contact a qualified electrician or ICM Controls customer support.
Warranty Information
ICM Controls products are manufactured to high standards and are typically backed by a manufacturer's warranty covering defects in materials and workmanship. For specific warranty terms, duration, and claim procedures, please refer to the warranty documentation included with your purchase or visit the official ICM Controls website. Keep your proof of purchase for warranty claims.
Customer Support
For technical assistance, product inquiries, or support, please contact ICM Controls directly. Contact information can typically be found on their official website or on the product packaging. When contacting support, please have your product model number (ICM402) and any relevant purchase details ready.
