9. Fault finding
9.1 Fail to start
Cause
Remedy
Power disconnected
•
Check the power connection.
Stator winding failure
•
Check the winding circuit.
Overload or transmission stuck • Select a larger motor or
reduce the load. If the
transmission is stuck, clear
the obstacle.
Wrong wiring
•
Correct the wiring.
9.2 Low speed when running on load
Cause
Remedy
Low power supply
•
Check the terminal voltage.
Overload
•
Select a larger motor or
reduce the load.
9.3 Current leakage on the enclosure
Cause
Remedy
Incorrect power and ground
connection
•
Correct the connection.
Winding aged or damp
•
Dry or replace the winding.
Lead wire contacts enclosure
•
Check if the lead wire
contacts the enclosure. In
case of contact with the
enclosure, insulate the wire.
9.4 Abnormal noise
Cause
Remedy
Phase-deficient running
•
Check the electrical
connection to exclude phase-
loss fault.
Bearing damage or lack of
grease
•
Replace the bearing or the
lubricating oil.
Friction between the stator and
the rotor
•
Check if there is any debris on
the inner surface of the stator.
9.5 Abnormal vibration
Cause
Remedy
Motor or load assembly loose
•
Check and tighten the foot
bolt.
Coupling or belt pulley
eccentric or out of balance
•
Calibrate eccentricity or
rebalance.
Shaft extension bent after
impact
•
Replace the stator or shaft.
Rotor out of balance
•
Rebalance the rotor.
9.6 Bearing overheat
Cause
Remedy
Bearing damaged
•
Replace the bearing.
Inadequate grease or poor
quality of grease
•
Replace the grease and keep
the amount between 1/2 and
2/3.
Coupling misalignment or
overtightness of pulley belt
•
Calibrate the shaft coupling or
adjust the tension of the belt.
Friction between the bearing
housing and the bearing
•
Replace the worn cover, shaft
or rotor.
Poor assembly of the motor
•
Reassemble the motor.
9.7 High temperature or smoke
Cause
Remedy
Overload
•
Select a larger motor or
reduce the load.
Temperature too high
•
Reduce the temperature or
the load.
Voltage too high or too low
•
Check if the voltage is too
high or too low. Lower the
load or stop the motor.
Two-phase operation
•
Check the electrical
connection to exclude phase-
loss fault.
Blocked airflow
•
Clean the dirt and debris in
the inlet and outlet.
10
English (GB)
