User Guide
6
7. Troubleshooting Motor Overheating Problems
CAUTION:
Motors are equipped with thermal overload protection. When internal motor temperature exceeds design limits, the
motor will automatically shut off. Motor will automatically restart when it cools sufficiently after overheating. Remove power
cord plug from AC receptacle before examining or working on a motor which has stopped because of overheating. Thermal
overload protection sensitivity increases with frequency. Take preventative steps to correct cause of overheating to assure long
motor life. Most overheating problems are associated with the use of portable power generators as the ventilator power supply.
Common causes of motor overheating:
§
Power generator not providing constant voltage. Ventilators are equipped with AC motors designed to operate
on power that falls between ±3% of design specifications.
§
Using too small gauge of extension cord.
§
Exceeding maximum length extension cord.
§
Insufficient unobstructed distance on exhaust side of ventilator. Please refer to the
Super Vac Training Manual
for Smoke Ventilation
for recommended ventilator placement.
§
Insufficient wattage generator. When running multiple ventilators on one generator, plug ventilators in one at a
time. Wait until first ventilator is running at full speed before connecting next ventilator to generator. Do not
exceed generator capacity.
§
Using accessory ducting of too small a diameter or excessive length.
§
Incorrect amperage circuit breaker for circuit load
§
Using reeled or coiled extension cords.
