Nardie
Member
- Location
- North Augusta, SC USA
I have a 480 VAC motor that normally pulls 50 in wc for exhaust. The other day the in wc dropped to 38 in wc. There was an initial concern of the motor was single-phasing, which I didn't think. However, today we checked the fuses, heater contact, and supply voltage. The fuses were good, and the heaters weren't tripped. The supply voltage was 479 VAC, so this was adequate. We also perform an ohm check on the motor winding's. They all read the same 0.6 ohms. From the operators inspection the inlet and discharge dampers were fully opened, so the motor wasn't dead headed. We are going to check the positions of the dampers again for verification. I also plan to perform static and dynamic testing on the motor to check the internal components of the motor. So I am wondering is there anything else I should do, or what else could cause the sudden drop in exhaust pressure? Thanks