Lenze Smart Motor m300 Bedienungsanleitung Seite 78

Diagnostics and fault elimination
Malfunctions
Error
Motor too hot
Can only be evaluated by measuring the
surface temperature:
• Non‐ventilated motors >140 °C
• Externally ventilated or self‐ventilated
motors > 110 °C
Motor suddenly stops and does not restart Overload monitoring of the inverter is
Vibrations
Running noises
For resistance measurement, observe the data on the brake nameplate.
Trouble
Brake does not release,
Air gap is not zero
Rotor cannot rotate freely
Rotor thickness too small
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Possible causes
Insufficient cooling air, blocked air ducts.
Preheated cooling air
Overload of the drive
Heat dissipation impeded by deposits
activated
Insufficiently balanced coupling elements
or machine
Inadequate alignment of drive train
Loose fixing screws
Foreign particles inside the motor
Bearing damage
Possible cause
Coil is interrupted
Coil has interturn fault or
short circuit to ground
Air gap s too large
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Air gap s too small
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Rotor was not replaced in
time
Remedy
Ensure unimpeded supply and removal of
cooling air
Ensure a sufficient supply of fresh cooling
air
Check load and, if necessary, reduce by
means of longer acceleration times
Check winding temperature
Clean surface and cooling fins of the
drives
Check inverter settings
Reduce load caused by longer acceleration
times
Rebalance
Realign machine unit, check foundation, if
necessary.
Check and tighten screw connections
Repair by the manufacturer, if necessary
Remedy
Measure the resistance of the coil with a multimeter:
• Compare measured resistance with rated resistance.
• If resistance is too high, replace the spring-applied brake
completely
Measure the resistance of the coil with a multimeter:
• Compare measured resistance with rated resistance.
• If the resistance is too low, replace the stator completely.
Check coil for short circuit to ground with a multimeter:
• Replace the spring-applied brake completely in case of short
circuit to ground.
Readjust air gap
Check air gap s and readjust if necessary.
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Replace rotor