If your heatsink has an integrated fan, ensure it is spinning freely and not clogged with grime.
Signals that the voltage has sagged below nominal operational limits, causing motors to draw excessive current. Direct Installation & Wiring Rules
The GMR32B (often branded as COCIS) is a compact, DIN-rail mounted three-phase voltage and phase-sequence protection relay. It is widely used in industrial and commercial environments to protect motors, HVAC systems, and other machinery from phase loss, incorrect phase sequence, and undervoltage. gmr32b phase controller manual hot
: A significant imbalance between phases causes internal components to work harder, increasing heat. Ventilation
When the three supply voltages are significantly unbalanced, the motor experiences negative‑sequence currents that produce double‑frequency heating in the windings. The GMR32B will detect severe imbalance (greater than 20% imbalance) and trigger its protection, but while the unit is still powered and the imbalance is below the alarm threshold, the distorted waveform can cause the protection module’s own power supply to run hotter than normal. This is especially true of the GMR‑32B_Smart‑Plus model, which is specifically designed for environments with high‑order harmonics (e.g., inverters, large VFDs) and uses a Buck‑topology power supply to maintain stable operation in such contaminated networks. If your heatsink has an integrated fan, ensure
: The most common cause of localized heat is loose screws at the input terminals. This creates electrical resistance, which converts energy into heat instead of signal. : Power down the system and tighten all terminal screws. Incorrect Phase/Hall Wiring
With a grunt, he jammed the rod home. The GMR32B let out a sound like a dying capacitor—a long, descending whine. The LEDs flickered green, one by one. The extruder groaned back to life. The fluorescent lights snapped back to a cool, steady white. It is widely used in industrial and commercial
Lights up when supply lines surge past or sag below standard thresholds, protecting internal insulation from melting under high currents. Why Is the Controller Running Hot? Troubleshooting Faults