Rockwell Automation 1326 Digital AC Multi-Axis Motion Control System User Manual - Manual (Page 179)

Publication 1394-5.0 — May 2000
Troubleshooting 9-13
Troubleshooting General System
Problems The tables that follow provide potential conditions that could occur
with your system and recommends possible resolutions to those
conditions.
Fault Message: Description: Potential Cause: Possible resolution:
Power Fault The current through any
one of the power IGBTs
has exceeded 300% if the
1394’s current rating. The motor lead has shorted • Check the motor cable.
• Check the resistance of each power phase
wire to ground. It should be in Mega ohms.
• Make sure ferrite cores are not installed on
motor power conductors.
The motor is malfunctioning • Check the resistance of each motor
winding phase to case ground with an ohm
meter. Readings should be in Mega ohms.
• Return motor for repairs.
Power IGBTs are malfunctioning. Replace the axis module.
PwrOn Enable During active fault reset,
an axis was enabled
before system power-up. An axis hardware enable input was active
during system control power on or during
fault reset. Verify that axis is not enabled before power is
applied.
Condition: Potential cause: Possible resolution:
Axis or System 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 or System is unstable [Prop Gain Kp, Intg Gain Ki, Feed Fwd Gain] parameters
(368, 372, 376 (Analog Servo only)) 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.
[Motor Type] parameter (100 (Analog Servo only)) is
incorrectly set (servo motor is not matched to 1394). • Check setups.
• Run auto tune.
You cannot obtain the
motor acceleration/
deceleration that you want [Pos Cur Lim, Neg Cur Lim] parameters (184, 188
(Analog Servo only)) are set too low. Verify that current limits are set properly.
[Motor Type] parameter (100 (Analog Servo only)) is
incorrectly set (Analog Servomotor is not matched to
1394). Program the correct motor and run auto
tune again.
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.
[Vel Rate Lim] parameter (136 (Analog Servo only)) is
incorrect. Verify that the parameters are set
correctly and correct them, as necessary.
[CW, CCW Vel Lim] parameters (128, 132 (Analog
Servo only)) are incorrect. Verify that the parameters are set
correctly and correct them, as necessary.
[Anlg Vel Scal] parameter (272 (Analog Servo only)) is
incorrect. Verify that the parameters are set
correctly and correct them, as necessary.