Rockwell Automation 999 IMC S Class Compact Motion Controller (Cat. No. 4100-999-122) - Manual (Page 178)

7-8 Troubleshooting
Publication 999-122 - January 1997
Troubleshooting General
System Problems The tables that follow provide potential conditions that could occur
with your system and recommends possible resolutions to those
conditions.
Table 7.B System Troubleshooting
Condition: Potential cause: Possible resolution:
Axis runs uncontrollably The velocity feedback, position feedback device, or
velocity command signal wiring is incorrect or open.
•
Check wiring.
Unintentionally in torque mode.
•
Check to see what mode was
programmed.
An internal malfunction exists.
•
Replace system or axis
module.
Axis is unstable [Prop Gain, Intg Gain, Feed Fwd Gain] are set too high.
•
Run auto tune.
Position loop gain or position controller accel/decel rate
is improperly set.
•
Run auto tune.
Improper grounding or shielding techniques are causing
noise to be transmitted into the position feedback or
velocity command lines, causing erratic axis movement.
•
Check wiring and ground.
You cannot obtain the motor
acceleration/deceleration that
you want The system inertia is excessive.
•
Check motor size vs.
application need.
•
Review servo system sizing.
The system friction torque is excessive.
•
Check motor size vs.
application need.
Available current is insufficient to supply the correct
accel/decel rate.
•
Check motor size vs.
application need.
•
Review servo system sizing.
Motor does not respond to a
Velocity Command Check for possible faults.
•
Verify that the parameters are
set correctly and correct
them, as necessary.
Enable signal has not been applied or the enable wiring is
incorrect.
•
Check the controller.
•
Check the wiring.
•
Check drive control.
The motor wiring is open.
•
Check the wiring.
The motor thermal overload has tripped.
•
Check for a fault.
•
Check the wiring.
The motor has malfunctioned.
•
Repair or replace the motor.
The coupling between motor and machine has broken
(i.e., the motor moves, but the load/machine doesnít).
•
Check and correct the
mechanics.
[CW, CCW VEL Lim] parameters are set incorrectly.
•
Check and properly set the
parameter.
•
Retune.
The drive has malfunctioned.
•
Replace the drive.