Parker NV Serie Mise En Service Et Utilisation page 23

NV
You note that the motor
does not turn by hand
You have difficulty
starting the motor or
making it run
You find
that the motor is drifting
You notice
that the motor is racing
You notice vibrations
You think
the motor is becoming
unusually hot
You find
that the motor is too
noisy

Check there is no mechanical blockage or seizing.

Check the eventual thermal protection.

Check the servomotor insulation (if in doubt, measure when hot and
when cold).
The minimum insulation resistance measured at 50 VDC max is 50 MΩ:
- Between the phase wire and the casing
- Between the thermal protector and the casing
- Between the brake winding and the casing
- Between the resolver windings and the casing.

Adjust the offset of the servoamplifier.

Check the speed set-point of the servoamplifier.

Check you are well in speed regulation (and not in torque
regulation).

Check the encoder and tachometer connections, the earth
connections (carrefully) and the earthing of the earth wire, the
setting of the servoamplifier speed loop, tachometer screening and
filtering.

Check the stability of the secondary voltages.

It may be overloaded or the rotation speed is too low : check the
current and the operating cycle of the servomotor.

Friction in the machine may be too high : test the motor current with
and without a load :
Check the motor doesn't have thermal insulation.
-
- Check the good functioning of the ventilation if the
servomotor has one.
Several possible explanations :

Unsatisfactory mechanical balancing

Defective coupling

Loosening of several pieces

Poor adjustment of the servoamplifier or the position loop :
check rotation with the loop open.
PVD 3535D – 01/2014
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