Mitsubishi Electric JR Series Instruction Manual page 25

Phenomenon
1. The motor can be
manually rotated in either
direction.
2. An abnormal noise is
heard.
A groan is heard.
A groan is heard when
starting.
3. No noise is heard.
4. Motor does not rotate
even manually.
5. The protection device
functions.
1. Rotates in reverse
direction.
2. The protection device
functions.
3. the speed does not
increase.
4. A groan is heard.
5. Temperature rises
abnormally during no-load
operation.
6. A rolling sound or metallic
sound is heard in the
bearing section.
7. The vibration is large.
Table 16 Troubleshooting
Cause
1. The switch or wire contact is faulty.
2. The fuse or a wire is broken.
3. The stator coil is faulty.
1. One phase is open causing a single
phase state.
2. The switch or wire contact is faulty.
3. The fuse or a wire is broken.
4. the stator winding is faulty.
5. There is a constraint in the motor
(bearing damage, etc.)
1. The stator winding is faulty.
2. Each interlock release state is faulty
Other than motor:
3. Power failure.
4. The fuse or two wires are broken.
5. Two or more switches have a faulty
contact.
6. Two or more starters have broken
wires.
1. Stator and rotor completely contact.
2. Bearings are damaged.
1. The terminal contact is faulty.
2. The stator winding is faulty.
1. The connection is incorrect.
1. the stator winding is faulty.
1. Y- starter contact is faulty.
2. The stator winding is faulty.
Excessive current:
1. The motor frictional torque is large.
2. The clearance of the stator and
rotor is incorrect.
3. The stator winding is faulty.
4. One phase opened causing a single
phase state during starting.
5. The stator winding is faulty.
1. The power is abnormal.
2. The cooling ventilation is obstructed.
3. The fan rotation direction is reversed.
4. The filter is clogged.
1. The bearings are defective.
2. The grease has deteriorated.
1. The motor side is unbalanced.
2. Vibration of the parts installed no the
motor is large.
3. The rotor is faulty.
4. The foundation is resonating.
5. The strength of the installation frame
is weak.
6. The foundation bolts are loose.
- 20 -
Remedy
1. Adjust or replace the contact section.
2. Inspect and repair or replace.
3. Have specialist repair.
1. Check the switch and power circuit.
2. Adjust or replace the contact section.
3. Inspect and repair or replace.
4. Have specialist repair.
5. Have specialist repair.
1. Have specialist repair.
2. Inspect the circuit.
3. Contact the power company.
4. Inspect and repair or replace.
5. Adjust or replace the contact section.
6. Inspect and repair the starter
conductor section.
1. Have specialist repair.
2. Have specialist repair.
1. Repair the contact section.
2. Have specialist repair.
1. Inspect and adjust the connection.
1. Have specialist repair.
1. Inspect and repair the Y- starter.
2. Have specialist repair.
1. Have specialist repair.
2. Have specialist repair.
3. Have specialist repair.
4. Inspect switch and power circuit.
5. Have specialist repair.
1. Improve the power facility.
2. Improve the cooling ventilation.
3. Change the fan rotation to the correct
direction.
4. Clean or replace the filter.
1. Have specialist repair.
2. Replace the grease.
1. Rebalance the rotor.
2. Adjust the balance of installed parts.
3. Replace the rotor.
4. Reinforce the foundation frame.
5. Reinforce the installation frame.
6. Retighten the foundation bolts.