Disconnect all three phases (L1, L2, L3). Measure voltage to confirm zero.
Power up control circuit only (main contactor off). Fan should spin immediately. If not, check manual’s fan wiring diagram—often FAN+ and FAN- are separate terminals.
Clamp meters on each phase. A 20% imbalance in current indicates failed SCR or partial load short. Manual: "Unbalanced three-phase load causes unequal SCR heating, leading to localized hot spots."
Gmr32b Phase Controller Manual Hot Here
Disconnect all three phases (L1, L2, L3). Measure voltage to confirm zero.
Power up control circuit only (main contactor off). Fan should spin immediately. If not, check manual’s fan wiring diagram—often FAN+ and FAN- are separate terminals. gmr32b phase controller manual hot
Clamp meters on each phase. A 20% imbalance in current indicates failed SCR or partial load short. Manual: "Unbalanced three-phase load causes unequal SCR heating, leading to localized hot spots." Disconnect all three phases (L1, L2, L3)