Parker PDHX-E Series User Manual page 94

Motor Fails to Move
Test the motor to see if it has holding torque. If there is no holding torque, here are some
probable causes:
• There is no power.
• Current DIP switch selection is not set properly.
• There are bad connections or bad cables in the motor circuit. Disconnect the power to
the drive and remove the motor connector. Using a meter, check the continuity in the
motor circuit between pins A+ and A- of the motor connector. Repeat for pins B+ and
B-.
• Check the resistance of the motor and cables to make sure that shorts do not exist
between phases or to earth GND. The resistance across each motor phase should be
consistent and there should be no connection between motor phases and between
each phase and earth ground.
• Check the motor cables for signs of damage.
• The shutdown input may be active.
• If the power LED is out and the motor will not energise, the drive must be returned for
repair.
If the unit has holding torque and the motor shaft still fails to move, here are some possible
causes:
• The load is jammed. You should hear the drive attempting to move the motor.
Remove power from the driver and verify that you can move the load manually away
from the point of the jam. Try running the motor using the self-test switch.
Motor Stalls
A motor stall during acceleration may be caused by one or more of the following factors:
• The torque requirements may be excessive.
• The acceleration ramp may be too steep - lower acceleration may be required. Check
the torque/speed curves in the published data and make sure you are trying to run the
motor within the system capabilities.
• The load inertia and rotor inertia may be grossly mismatched.
If the motor stalls during the constant velocity portion of a move, the shaft and/or coupler may
be damaged or binding due to improper coupling or excessive motor load.
A stall may occur if the switch setting for the motor current selection is incorrect. The motor
may not be receiving enough current to drive the load.
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