Parker LX Mise En Service Et Utilisation page 19

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 the electricity supply to the brake.

Check there is no mechanical blockage or seizing.

Check the fuses, voltage at the terminals (the load may be too high or the
bearings may be seized) and the load current.

Check the electricity supply to the brake (+ 24 V, ± 10 %) and its polarity.

Check the eventual thermal protection.

Check any heat protection.

Check the servomotor insulation (if in doubt, measure when hot and when
cold).
The minimum insulation resistance measured at 50 V DC 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 on the front face of the servoamplifier after putting a "0"
signal of Ref. input.

Check that the Ref. input of the servoamplifier is "0 V".

Check you are well in speed regulation (and not in torque regulation).

Check the good phase order of the servomotor : U, V, W.

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 : 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 brake doesn't rub when it is energized.
-
- Check the good functioning of the ventilation if the servomotor has
one.
Several possible explanations :

Unsatisfactory mechanical balancing

The brake rubs (mechanical seizing)

Defective coupling

Loosening of several pieces

Poor adjustment of the servoamplifier or the position loop :
check rotation with the loop open.