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9
Installation Instructions
Abnormal Noise
Noisy Motor
Motor heating up abnormally
Motor will not start
Brake does not release
Brake releases but is very noisy
Brake releases but braking is insufficient
Originating from motor or driven machine?
Mechanical causes: if noise persists after
switching off the electrical power supply.
- Bearing noise
- Mechanical friction: ventilation, brake
disc, coupling
Electrical cause: if noise stops after
switching off the electrical power supply.
- Normal voltage and 3 phases are
balanced
- Abnormal voltage
- Phase imbalance
- Faulty ventilation
- Faulty power supply
- Terminal connection fault
- Overload
- Partial short-circuit
- Phase imbalance
No load:
- Mechanical locking
- Broken supply line
With load:
- Phase imbalance
Insufficient supply voltage:
Defective coil:
Air gap is irregular, or is too large:
Foreign body in air gap.
Insufficient pressure on springs.
If spring pressure is correct.
* Uncouple motor from machinery and
run test motor/gearmotor alone.
* Test the brake release system.
* Check the bearings for damage.
* Check.
* Check the power supply at the motor’
leads.
* Check tightness of power connections
in the conduit box.
* Check the power supply line.
* Check the winding resistance and the
supply (voltage) balance.
* Monitor ambient.
* Clean the fan cover guard grill and
cooling fan.
* Check the fan for correct mounting on
shaft.
* Check.
* Check.
* Check the current consumption against
the nameplate current rating.
* Check the electrical continuity of the
windings and/or the insulation.
* Check the winding resistance.
Release the brake and with the motor
switched off:
* Check motor shaft rotates freely by hand.
* Check fuses, electrical protection,
starting device and electrical continuity.
When switched off:
* Check the direction of rotation (phase
order).
* Check resistance and the continuity of
the motor windings.
* Check electrical protection.
The maximum permissible voltage drop is
15% of the rated voltage.
Replace the coil.
Dismantle and clean.
Clean the parts.
* Check spring quantity and color.
* Check air gap.
* Check surface condition of the friction
lining and the brake armature.
* Blow away any friction dust.
Symptom
Probable Cause(s)
Action Recommended
7 Troubleshooting Guide