Common
9. Troubleshooting
72
73
Table 9-2 Troubleshooting
Problem
Cause
Correction
Abnormal sound
Excessive vibration
Dust and foreign matter in bearings, or dam-
aged bearings
Consult with authorized maintenance shop.
Reducer parts grinding on foreign matter
Consult with authorized maintenance shop.
Reducer parts are damaged
Consult with authorized maintenance shop.
Warping of housing because the installation
surface is not flat
Make the installation base flat or make adjust-
ment using liners, etc.
Resonance due to insufficient rigidity of the
installation base
Reinforce the installation base to increase
rigidity.
Nonalignment of the center of axle with
driven machine
Align the center of axle.
Transmission of vibration from the driven
machine
Individually operate the product to check the
source of the sound.
Abnormal motor sounds
Foreign objects have entered
Consult with authorized maintenance shop.
Bearing damage
Consult with authorized maintenance shop.
Improper brake gap adjustment
Adjust the brake gap.
(See P45 - 66.)
Wear of the brake lining or inner disc
Request brake lining and inner disc replace-
ment from an authorized maintenance shop.
Brake unit electromagnetic coil burnout
Consult with authorized maintenance shop.
Rectifier damage
Consult with authorized maintenance shop.
A leaf spring in the brake boss unit has come
off or is damaged.
Consult with authorized maintenance shop.
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 maintenance shop to re-
adjust.
Slips
(Braking takes a long
time)
Not using the quick braking circuit
Change to quick braking circuit.
(See P25 - 34.)
Foreign objects or oil adhesion in brake lining
unit and inner disc
Request cleaning from authorized mainte-
nance shop.
Wear of the brake lining or inner disc
Adjust the brake gap.
Request brake lining and inner disc replace-
ment from an authorized maintenance shop.
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.
In
ver
ter
Tripping
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 output side
Take measures to prevent ground fault.
Direct current overcur-
rent
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.