34 Hyponic® Operating and Maintenance Manual
Hyponic® Operating and Maintenance Manual 35
www.SumitomoDrive.com
Problem Possible Cause Corrective Action
Brake fails to operate
Improper adjustment after
reassembly
Adjust again.
Brake slips
(Braking time is too
long)
Not wired for fast action Wire for fast action.
Foreign matter entrapped in brake lining.
Oil on lining surface
Remove foreign matter and take preventive
action. Wipe lining surface with a dry cloth.
Worn brake lining Adjust brake gap or replace lining.
Uneven brake gap Adjust evenly.
Excessive load Decrease load or use larger brake.
Rotor fails to turn
Faulty electric circuit Check circuit.
Blow fuse Replace fuse.
Only single phase available from three
phase power supply
Measure power supply voltage and check for
defective circuit.
Protective device has tripped Eliminate cause and reset.
Damaged or burned motor winding Repair or replace.
Rust on brake friction surface Clean brake (lining).
Gap needs adjustment Readjust gap.
Burned bearing Replace.
Overload
Replace. Check and troubleshoot load and
safety device.
Abnormal noise
Foreign material inside the brakemotor.
Examine inside brakemotor and remove foreign
material.
Damaged bearing Replace.
Worn brake lining Adjust brake gap or replace lining.
Hub leaf spring is off or damaged Replace.
Burned solenoid coil Replace.
Damaged rectifier Replace.
Trouble under loaded
condition
Voltage drop Raise voltage to rated level.
Overload Reduce the load or oversize the brakemotor.
Improper protective device setting Adjust protective device.
Table 18. Quick Troubleshooting Guide (cont.)
BRAKE
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