Sumitomo CYCLO Service Manual

7372
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 at
Make the installation base at or make
adjustment using liners, etc.
Resonance due to insucient 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 inuence of load uctuation and
vibration from the device causes it.
Performance and lifetime are not aected.
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.
Rectier damage Confer with authorized service station.
Leaf spring in the brake boss unit has come
o or is damaged
Confer with authorized service station.
Brake is ineective
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 specied value.
Brake release bolt not suciently restored Restore the release bolt.
Tripping
Inverter
Overcurrent shut-o
Sudden speed changes Increase the time for speed changes.
Extreme load uctuation Decrease load uctuation.
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-o
Sudden speed reduction
Increase the time for speed reduction.
Decrease brake frequency.
Thermal operation Overload Decrease the load to the specied value.

Sumitomo CYCLO Specifications

General

Control Method	PWM (Pulse Width Modulation)
Cooling Method	Forced air cooling
Protection Features	Overcurrent Protection, Overvoltage Protection, Overtemperature Protection, Short Circuit Protection
Operating Temperature	0°C to 40°C
Humidity	20% to 90% (non-condensing)
Dimensions	Varies by model
Weight	Varies depending on model (Consult specific datasheet)
Storage Temperature	-20°C to +60°C