51
COMMON
Type of Trouble Cause Remedy
Grease leakage
Grease leakage from the
output section
Damaged oil seal.
Consult with the certified service
shop.
Grease leakage from the
casing seam
Slacked bolts.
Tighten the bolts or consult with
the certified service shop.
Damaged gear.
Consult with the certified service shop.
Abnormal noise or
excessive vibration
Abnormal noise in the motor
Distortion of the housing due to
rough bed surface.
Flatten the bed surface or adjust
the bed with the liner.
Resonance resulting from
insufficient rigidity of the bed.
Improve rigidity of the bed by
reinforcement.
Misalignment of connecting shafts.
Realign or use flexible coupling.
Foreign substances inside the motor.
Eliminate the foreign substances.
Damaged bearing.
Consult with the certified service shop.
Vibration transferred from the
connected machine.
Detect vibration sources by running
the gearmotor independently.
Improper brake gap adjustment.
Adjust the brake gap.
(Refer to page 46–49)
Worn brake lining.
Replace the brake lining.
(Refer to page 49 )
Burned magnetic coil in the brake
assembly.
Consult with the certified service shop.
Failure of the rectifier Replace the rectifier.
Disengagement or failure of leaf
spring in the brake boss.
Consult with the certified service shop.
Defective governor switch ( 0.1-
0.4kW single-phase motor )
Consult with the certified service shop.
Releasing bolt not returned to the original position.
Ineffective braking
function
Inverter tripping
Brake does not work.
Return the bolt to the original position and
readjust the gap.
A fast braking circuit is not
working.
The brake slips.
Braking response
is slow.
Shift to the fast braking action
(Refer to page 27–34)
Foreign substances or oil are
adhered to the brake lining.
Consult with the certified service shop.
Worn brake lining.
Adjust the brake gap or consult
with the certified service shop.
Uneven brake gap. Adjust the brake gap.
Overloading.
Reduce the load or apply a larger brake frame.
Insufficient recovery of the releasing bolt.
Reset the releasing bolt to the original position
and readjust the gap.
Sudden
acceleration / deceleration
Make the acceleration /
deceleration time longer.
Sudden change in load Decrease the load.
Grounding on the output side
Make correction to eliminate
grounding
Short - circuiting on the output
side
Make correction to eliminate
short -circuiting. Check cables.
Sudden deceleration
Make the deceleration time longer.
Reduce the braking frequency.
Overloading
Shut-off due to
overcurrent
Grounding overcurrent
DC overcurrent
Shut-off due to
regenerative overvoltage
Thermal relay operation
Decrease the load to the specified
value.
Table 14 Troubleshooting
Ooze of grease from an oil
seal.
Ooze of lubricating grease from
an oil seal at an early stage of
operation.
Wipe up grease or replace an oil
seal when grease leakage cannot
be protected.
10. Troubleshooting
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