Allen-Bradley PowerFlex 527, User Manual

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Rockwell Automation Publication 520-UM002B-EN-E - December 2017 129
Troubleshooting Chapter 7
Logix5000 Controller and
Drive Behavior By using the Logix Designer application, you can configure how the
PowerFlex 527 drives respond when a drive fault/exception occurs.
The drive supports fault action for Ignore, Alarm, Minor Fault, and Major Fault
as defined in
PowerFlex 527 Drive Exception Action Definitions on page 130 .
See the drive behavior tables beginning on page 131 for information on how the
fault and stopping actions apply to each of the exception fault codes.
The drive supports these configurable stopping actions
(1)
:
• Disable and Coast
• Current Decel and Disable
• Ramped Decel and Disable
(1) Disable and Coast and Current Decel and Disable are available in Frequency Control, Velocity Loop and Position Loop.
Ramped Decel and Disable is available in Frequency Control and Velocity Loop only and is not supported in Position Loop.
Presence of noise on command or
motor feedback signal wires. Recommended grounding per installation instructions have not been
followed. • Verify grounding.
• Route wire away from noise sources.
• See System Design for the Control of Electrical Noise,
publication
GMC-RM001 .
Line frequency can be present. • Verify grounding.
• Route wire away from noise sources.
Variable frequency can be velocity feedback ripple or a disturbance caused by
gear teeth or ballscrew, and so forth. The frequency can be a multiple of the
motor power transmission components or ballscrew speeds resulting in
velocity disturbance. • Decouple the motor for verification.
• Check and improve mechanical performance, for example,
the gearbox or ballscrew mechanism.
No rotation The motor connections are loose or open. Check motor wiring and connections.
Foreign matter is lodged in the motor. Remove foreign matter.
The motor load is excessive. Verify the induction system sizing.
The bearings are worn. Return the motor for repair.
The motor brake is engaged (if supplied). • Check brake wiring and function.
• Return the motor for repair.
The motor is not connect to the load. Check coupling.
Motor overheating The duty cycle is excessive. Change the command profile to reduce accel/decel or increase
time.
The rotor is partially demagnetized causing excessive motor current. Return the motor for repair.
Abnormal noise Motor tuning limits are set too high. Run Tune in the Logix Designer application.
Loose parts are present in the motor. • Remove the loose parts.
• Return motor for repair.
• Replace motor.
Through bolts or coupling is loose. Tighten bolts.
The bearings are worn. Return motor for repair.
Mechanical resonance. Notch filter can be required (See Axis Properties dialog box,
Output tab in the Logix Designer application).
Erratic operation - Motor locks into
position, runs without control or with
reduced torque. Motor power phases U and V, U and W, or V and W reversed. Check and correct motor power wiring.
General Troubleshooting
Condition Potential Cause Possible Resolution
TIP
The INIT FLT xxx faults are always generated after powerup, but before the
drive is enabled, so the stopping behavior does not apply.
NODE ALARM xxx faults do not apply because they do not trigger stopping
behavior.