Rockwell Automation Publication 2198-UM002E-EN-P - February 2018
225
Troubleshoot the Kinetix 5700 Drive System
Chapter 7
You cannot obtain the motor
acceleration/deceleration that you
want.
Torque Limit limits are set too low.
Verify that torque limits are set properly.
Incorrect motor selected in configuration.
Select the correct motor and run Tune in the Logix Designer application again.
The system inertia is excessive.
• Check motor size versus application need.
• Review servo system sizing.
The system friction torque is excessive.
Check motor size versus application need.
Available current is insufficient to supply the correct accel/decel rate.
• Check motor size versus application need.
• Review servo system sizing.
Acceleration limit is incorrect.
Verify limit settings and correct them, as necessary.
Velocity Limit limits are incorrect.
Verify limit settings and correct them, as necessary.
The motor is operating in the field-weakening range of operation.
Reduce the commanded acceleration or deceleration.
Motor does not respond to a
command.
The axis cannot be enabled until stopping time has expired.
Disable the axis, wait the configured stopping time, and enable the axis.
The motor wiring is open.
Check the wiring.
The motor cable shield connection is improper.
• Check feedback connections.
• Check cable shield connections.
The motor has malfunctioned.
Repair or replace the motor.
The coupling between motor and machine has broken (for example, the
motor moves, but the load/machine does not).
Check and correct the mechanics.
Primary operation mode is set incorrectly.
Check and properly set the limit.
Velocity or torque limits are set incorrectly.
Check and properly set the limits.
Brake connector not wired
Check brake wiring
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.
• Refer to System Design for Control of Electrical Noise, publication
.
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 servo 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 (refer to 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.
Table 106 - General Troubleshooting (continued)
Condition
Potential Cause
Possible Resolution