Mitsubishi Electric HR Series, Instruction Manual

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Table 16 Troubleshooting
Phenomenon Cause Remedy
The motor doe
s not rot
ate even in the
no-l
oad st
ate
1. The motor can be
manually rotated in either
direction.
1. The switch or wire contact is faulty.
2. The fuse or a wire is broken.
3. The stator coil is faulty.
1. Adjust or replace the contact section.
2. Inspect and repair or replace.
3. Have specialist repair.
2. An abnormal noise is
heard.
A groan is heard.
A groan is heard when
starting.
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. 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.
3. No noise is heard. 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. 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.
4. Motor does not rotate
even manually.
1. Stator and rotor completely contact.
2. Bearings are damaged.
1. Have specialist repair.
2. Have specialist repair.
5. The protection device
functions.
1. The terminal contact is faulty.
2. The stator winding is faulty.
1. Repair the contact section.
2. Have specialist repair.
Motor rot
ates duri
ng
no-l
oa
d st
ate
1. Rotates in reverse
direction.
1. The connection is incorrect. 1. Inspect and adjust the connection.
2. The protection device
functions.
1. the stator winding is faulty. 1. Have specialist repair.
3. the speed does not
increase.
1. Y-  starter contact is faulty.
2. The stator winding is faulty.
1. Inspect and repair the Y-  starter.
2. Have specialist repair.
4. A groan is heard. 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. Have specialist repair.
2. Have specialist repair.
3. Have specialist repair.
4. Inspect switch and power circuit.
5. Have specialist repair.
5. Temperature rises
abnormally during no-load
operation.
1. The power is abnormal.
2. The cooling ventilation is obstructed.
3. The fan rotation direction is reversed.
4. The filter is clogged.
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.
6. A rolling sound or metallic
sound is heard in the
bearing section.
1. The bearings are defective.
2. The grease has deteriorated.
1. Have specialist repair.
2. Replace the grease.
7. The vibration is large. 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.
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.
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