Gmr32b Phase Controller Manual »
Connect the L1, L2, and L3 phases to the designated input terminals.
: Newer "Smart" versions are specifically designed to handle harsh environments, including high temperatures, high humidity, and harmonic interference. Versatile Application
Based on technical details and user feedback, here is a review of the product and its manual.
is noted as an essential tool for its intuitive installation and troubleshooting procedures Manual & Installation Review User-Friendly Guidance : Reviewers from
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If the unit is not performing as expected, check the following: Potential Cause Blown internal fuse Replace fuse with correct rating Overheating Poor ventilation Check fan and clearance Erratic Control Signal interference Use shielded control cables Status LED Red Input phase loss Verify all incoming power lines 🛡️ Maintenance and Safety
Voltage has dropped below the operational limit. Common Applications The GMR-32B is widely used in industrial settings such as:
| Problem | Possible Cause | Solution | | :--- | :--- | :--- | | | No power supply. | Check the main incoming power to the panel. | | Green 'Normal' LED is off; Red or Yellow fault LED is on. | A specific fault condition is present. | Identify which LED is on and refer to Section 4 of this manual to diagnose the fault. Common issues include phase loss, incorrect phasing, or voltage imbalance. | | Load cycles on and off intermittently. | Power fluctuations causing frequent over/under-voltage trips. | Check the supply voltage stability. The device is likely doing its job correctly. | | Motor fails to start, but all LEDs appear normal. | External wiring fault. | Check the control circuit wiring between the GMR-32B's output relay and the load's contactor or starter. | | Where should this be installed? | Application question. | Mount it on a DIN rail inside the main control panel, upstream of any VFDs. |
): Connect the three incoming phases to the labeled input terminals. Connect the L1, L2, and L3 phases to
The gate driver PCB is epoxy-sealed. Send the unit for factory repair or replace with a new GMR32B-xxA model.
Ensures the motors run in the correct direction (A-B-C rotation).
Detects phase loss, phase sequence reversal (incorrect phase order), and sometimes under-voltage/over-voltage depending on the specific model variation.
| LED State | Meaning | Recommended Action | | :--- | :--- | :--- | | | Normal – Device is powered, phase sequence correct, voltage within limits. | None – normal operating condition. | | Yellow (Upper) / LED 1 ON | Phase Loss / Open Phase – One or more of L1, L2, L3 is missing or severe voltage imbalance detected. | Check all three phases on the input side with a multimeter. Check fuses, circuit breakers, and upstream connections. | | Yellow (Lower) / LED 2 ON | Phase Reversal (Incorrect Phase Sequence) – L1, L2, L3 are not in correct order (e.g., L1-L3-L2). | Swap any two of the three input phase connections (e.g., swap L2 and L3). | | Red LED ON | Overvoltage or Undervoltage – Input voltage is outside the specified tolerance range. | Measure voltage between phases. If overvoltage, check utility supply. If undervoltage, check for transformer issues, undersized wiring, or heavy load starts. | | No LED | No Power – Device is not powered or internal failure. | Check input power to L1-L3. Confirm L1/L2/L3 have full voltage to neutral or each other. | is noted as an essential tool for its
LED Status Indicator (Green: Power On/Normal, Red/Flashing: Error) DIN-rail Mounting or Screw Mounting Contact Capacity Commonly 5A at 250V AC (Resistive) 3. Installation Guide for GMR32B
The GMR-32B is a versatile, multi-function power protection relay designed for three-phase power systems. Often described as a phase controller, voltage monitor, or phase sequence protector, its primary role is to monitor incoming three-phase power and protect expensive downstream equipment—such as motors, compressors, pumps, and HVAC systems—from damage caused by various power quality issues.
| Terminal Label (Typical) | Description | | :--- | :--- | | (or R ) | Phase 1 input (Line 1) | | L2 (or S ) | Phase 2 input (Line 2) | | L3 (or T ) | Phase 3 input (Line 3) | | N | Neutral connection (for 4-wire GMR-32B+N models) | | A1 | Coil (Relay Control) Supply voltage (same as line side) | | A2 | Common (Return) | | 11 (or 95 / NC ) | Normally Closed (NC) contact | | 12 (or 96 / COM ) | Common contact | | 14 (or 98 / NO ) | Normally Open (NO) contact |
The "GMR-32B" designation encompasses a family of related models, each with slight variations for different applications. The table below outlines some of the most common variants.
