Troubleshooting General System Problems - Allen-Bradley 1394 User Manual

Fault Message: Description:
Power Fault
The current through any
one of the power IGBTs
has exceeded 300% if the
1394's current rating.
PwrOn Enable
During active fault reset,
an axis was enabled
before system power-up.
Troubleshooting General System
Problems
Condition:
Axis or System runs
uncontrollably
Axis or System is unstable
You cannot obtain the
motor acceleration/
deceleration that you want
The motor lead has shorted
The motor is malfunctioning
Power IGBTs are malfunctioning.
An axis hardware enable input was active
during system control power on or during
fault reset.
The tables that follow provide potential conditions that could occur
with your system and recommends possible resolutions to those
conditions.
Potential cause:
The velocity feedback, position feedback device, or
velocity command signal wiring is incorrect or open.
Unintentionally in torque mode.
An internal malfunction exists.
[Prop Gain Kp, Intg Gain Ki, Feed Fwd Gain] parameters
(368, 372, 376 (Analog Servo only)) are set too high.
Position loop gain or position controller accel/decel rate
is improperly set.
Improper grounding or shielding techniques are causing
noise to be transmitted into the position feedback or
velocity command lines, causing erratic axis movement.
[Motor Type] parameter (100 (Analog Servo only)) is
incorrectly set (servo motor is not matched to 1394).
[Pos Cur Lim, Neg Cur Lim] parameters (184, 188
(Analog Servo only)) are set too low.
[Motor Type] parameter (100 (Analog Servo only)) is
incorrectly set (Analog Servomotor is not matched to
1394).
The system inertia is excessive.
The system friction torque is excessive.
Available current is insufficient to supply the correct
accel/decel rate.
[Vel Rate Lim] parameter (136 (Analog Servo only)) is
incorrect.
[CW, CCW Vel Lim] parameters (128, 132 (Analog
Servo only)) are incorrect.
[Anlg Vel Scal] parameter (272 (Analog Servo only)) is
incorrect.
Potential Cause:
Troubleshooting
Possible resolution:
• 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.
• 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.
Replace the axis module.
Verify that axis is not enabled before power is
applied.
Possible resolution:
Check wiring.
Check to see what mode was
programmed.
Replace system or axis module.
Run auto tune.
Run auto tune.
Check wiring and ground.
• Check setups.
• Run auto tune.
Verify that current limits are set properly.
Program the correct motor and run auto
tune again.
• Check motor size vs. application need.
• Review servo system sizing.
Check motor size vs. application need.
• Check motor size vs. application need.
• Review servo system sizing.
Verify that the parameters are set
correctly and correct them, as necessary.
Verify that the parameters are set
correctly and correct them, as necessary.
Verify that the parameters are set
correctly and correct them, as necessary.
Publication 1394-5.0 — May 2000
9-13