Always install the GMR-32B on the power supply side . Never install it on the output side of a variable frequency drive (VFD/inverter), as this will damage the unit. Troubleshooting "Hot" Issues & Nuisance Tripping
Most units include diagnostic lights; a "Normal" green light indicates correct phase sequence and voltage, while a red light indicates a fault (e.g., phase reversal or loss). gmr32b phase controller manual hot
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