133 – Pvd3665_Gb_Ex_August 2022
4.5. Troubleshooting
Some symptoms and their possible causes are listed below. This list is not comprehensive.
Whenever an operating incident occurs, consult the relevant servo drive installation
instructions (the troubleshooting display indications will help you in your investigation) or
contact us at: http://www.parker.com/eme/repairservice.
You note that the motor
does not turn by hand
when the motor is not
connected to the drive.
• Check there is no mechanical blockage or if the motor terminals are
not short-circuited.
• Check the power supply to the brake.
You have difficulty
starting the motor or
making it run
• Check on the fuses, the voltage at the terminals (there could be an
overload or the bearings could be jammed), also checks on the load
current.
• Check the power supply to the brake (+ 24 V ± 10 %) and its polarity.
• Check on any thermal protection, its connection and how it is set in
the drive.
• Check on the servomotor insulation (if in doubt, carry out hot and
cold measurements).
The minimum insulation resistance value measured under a max. 50V
DC is 50 MΩ:
• Between the phase and the casing
• Between the thermal protection and the casing
• Between the brake coil and the casing
• Between the resolver coils and the casing.
You find that the motor
speed is drifting
• Reset the offset of the servoamplifier after having given a zero
instruction to the speed setpoint input.
You notice that the
motor is racing
• Check the speed setpoint of the servo drive.
• Check you are well and truly in speed regulation (and not in torque
regulation).
• Check the encoder setting
• Check on the servomotor phase order: U, V, W
• Check the encoder and tachometer connections, the earth
connections (carefully) and the earthing of the earth wire, the setting
of the servo drive speed loop, tachometer screening and filtering.
• Check the stability of the secondary voltages.
• Check the rigidity of the frame and motor support..
You think the motor is
becoming unusually hot
• It may be overloaded or the rotation speed is too low : check the
current and the operating cycle of the motor.
• Check if the mounting surface is enough or if this surface is not a
heat source – see §3.6 cooling.
• Friction in the machine may be too high :
- Test the motor current with and without a load.
- Check the motor does not have thermal insulation.
- Check that there is no friction from the brake when the brake
power is on.
You find that the motor
is too noisy
Several possible explanations :
• Unsatisfactory mechanical balancing
• There is friction from the brake: mechanical jamming.
• Defective coupling
• Loosening of several pieces
• Poor adjustment of servo drive or position loop : check rotation in
open loop
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