The (also recognized as the COCIS GMR-32B three-phase sequence protector) is a high-performance, micro-control electronic protection relay designed to safeguard industrial three-phase equipment from critical electrical faults. Operating primarily across AC 50/60Hz networks with a rated voltage up to 460VAC (commonly 380VAC) , this device continuously monitors power supply lines. It actively prevents hardware destruction caused by overvoltage, undervoltage, phase loss, phase reversal, and phase imbalance.
Clean the heatsink and check the cooling fan.
If installing multiple units, space them at least 30mm apart horizontally. 4. Wiring Diagrams and Terminal Connections Main Power Connections (High Voltage)
Do you need help or a wiring diagram for a particular motor type? gmr-32b phase controller manual
| Indicator | Color / Label | Meaning / What to Do | | :--- | :--- | :--- | | | Green / 'Normal' | This should be the only lit LED. It confirms correct phase sequence (L1-L2-L3) and voltage is within tolerance. | | Reverse Phase | Red / 'Reverse' (or 'Inverse') | Two phases are swapped. Immediately swap any two of the three incoming power leads (e.g., L1 and L2) at the input terminal block to correct this. | | Phase Loss | Yellow 'Upper' / 'Loss' | One or more phases is missing. Check upstream fuses, breakers, and connections. The GMR-32B's protection is unaffected by load current —it monitors pure voltage. | | Over Voltage | Yellow 'Lower' / 'OV' | Supply voltage exceeds the set threshold. Verify incoming voltage to the facility and check if an upstream tap changer or regulator needs adjustment. | | Under Voltage | Yellow 'Lower' / 'UV' | Supply voltage has dropped below the set threshold. Inspect for loose connections, heavy load startup, or utility brownout conditions. |
Connect directly to your heating element or motor. Control Terminals
The is a three-phase power supply protection relay commonly used for industrial equipment like central air conditioners, elevator motors, and pumps. It uses micro-control circuits to detect faults and cut power to prevent equipment damage. Key Technical Specifications The GMR-32B is designed for voltage systems up to 500V . The (also recognized as the COCIS GMR-32B three-phase
The GMR-32B utilizes advanced microprocessor-controlled phase-angle firing to regulate AC power. By precisely clipping the AC waveform, it delivers smooth, infinitely variable power to resistive and inductive loads. Key Specifications 110V – 480V AC (Self-sensing, 50/60 Hz)
The most frequent cause of "nuisance tripping." Ensure all terminals are tightened securely.
Rated at 380VAC ; universally compatible with 50/60Hz networks up to 460V . Clean the heatsink and check the cooling fan
Connect the three-phase power lines (L1, L2, L3) to the designated input terminals on the relay.
. Single-strand solid core wire may insert directly into the pressure plate terminals. When using flexible stranded wire, crimp on a needle-type or pin ferrule terminal beforehand to guarantee mechanical reliability.
The following specifications apply to the GMR-32B and GMR-32B Smart Series:
