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9. Troubleshooting
Common
Table 9-2 Troubleshooting
Problem
Cause
Correction
Abnormal sound
Excessive vibration
Dust and foreign matter in bearings, or
damaged bearings
Confer with authorized service station.
Reducer parts grinding on foreign matter
Confer with authorized service station.
Reducer parts are damaged
Confer with authorized service station.
Warping of housing because the installation
surface is not flat
Make the installation base flat or make
adjustment using liners, etc.
Resonance due to insufficient rigidity of
installation base
Reinforce the installation base to increase
rigidity.
Nonalignment of shaft with driven machine
Align the shaft centers.
Transmission of vibration from the driven
machine
Individually operate the products to check
the source of the sound.
With torque limiter, makes chattering
sound
In rare cases this will occur in a low load
range. The influence of load fluctuation and
vibration from the device causes it.
Performance and lifetime are not affected.
It is OK to continue operation.
Abnormal motor sounds
Foreign objects have entered
Confer with authorized service station.
Bearing damage
Confer with authorized service station.
Improper brake gap adjustment
Adjust the brake gap.
(See P47 – 68)
Brake lining or inner disc wear
Request brake lining or inner disc
replacement from an authorized service
station.
Brake unit electromagnetic coil burnout
Confer with authorized service station.
Rectifier damage
Confer with authorized service station.
Leaf spring in the brake boss unit has come
off or is damaged
Confer with authorized service station.
Br
ake is ineff
ec
tiv
e
Does not activate
Forgot to restore the brake release bolt to its
original position
Restore the release bolt.
Improper adjustment after disassembly
Request authorized service station to
re-adjust.
Slips
(Braking takes a long
time)
Not using the quick braking circuit
Change to quick braking circuit.
(See P20 – 29)
Foreign objects in brake lining or inner disc
unit, oil adhesion
Request cleaning from authorized service
station.
Brake lining or inner disc wear
Adjust the brake gap.
Request brake lining or inner disc
replacement from an authorized service
station.
Brake gap not uniform
Adjust the brake gap.
Overload
Decrease the load to the specified value.
Brake release bolt not sufficiently restored
Restore the release bolt.
T
ripping
In
ver
ter
Overcurrent shut-off
Sudden speed changes
Increase the time for speed changes.
Extreme load fluctuation
Decrease load fluctuation.
Overcurrent due to
ground fault
Ground fault on out side
Take measures to prevent ground fault.
Direct current
overcurrent
Short on output side
Take measures to prevent short.
Inspect wiring.
Regenerative overvoltage
shut-off
Sudden speed reduction
Increase the time for speed reduction.
Decrease brake frequency.
Thermal operation
Overload
Decrease the load to the specified value.
