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MOTOR OPERATOR TROUBLE SHOOTING GUIDE
SYMPTOM
Motor does not run when OPEN or
CLOSE button is pushed.
Motor runs but door does not
move.
Motor hums but does not run.
Operator runs in wrong direction
and limits do not function.
Limit switches do not hold their
settings.
Door 'drifts' when motor shuts off.
Operator does not shut off at full
OPEN or at full CLOSE position.
Operator Functions Erratically
POSSIBLE CAUSE
Circuit breaker tripped or power fuse
blown.
Thermal overload tripped.
External interlock open. (if supplied)
Sprocket key missing or drive chain
broken.
Intermediate shaft or key damaged.
Door jammed. Drive train jammed.
Dead phase in 3 phase system.
Brake does not release.
Open motor winding.
On 3 phase operators power supply is out
of phase.
Note: All units are checked for proper rotation at factory. Limit switch adjustment
instructions in electrical enclosure indicates proper direction of travel for OPEN and
CLOSE limit nuts.
Limit nut loose.
Brake inoperative or worn.
Limits not adjusted properly.
Defective limit switch
Low line voltage
Bad ground
"Noise" on electrical line
18
REPAIR
Check circuit breaker, power fuses, safety
switch; check cause.
Reset; check cause.
Close interlocks.
Check drive train for operation
Close & lock off door, remove motor and
inspect; check cause.
Check door. Try to operate manually.
Check power supply.
Check power to brake coil.
Check all motor connections.
Interchange any 2 wires in 3O
Adjust nut to proper torque.
Check brake operation.
Adjust
Operate limit switch manually to determine.
Check line voltage at operator. Low voltage,
check cause.
Check circuit for high current draws.
Eliminate all other units from the circuit.
Check ground connections.
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