Installation manual

Publication 1394-IN002B-EN-P — February 2004
Troubleshooting Status Indicators 4-9
PositionErrorFault
(Ax: Follow Error)
Axis position error limit
has been exceeded. This
fault can be configured for
status only.
The motor cannot keep up with the position
command.
• Check motor load for binding.
• Increase position loop proportional gain.
• Increase the allowable following error.
DriveOvercurrent
Fault
(Ax: I(t) Fault)
The output current is
exceeding the time-current
rating.
Accel/decel command from position controller is
requiring peak current for an excessive amount of
time.
Change the command profile to reduce speed
or increase time.
The machine friction, inertial load, and/or viscous
load is excessive.
• Change the command profile to reduce
speed or increase time.
• Check for mechanical problems on the
machine.
The motor has been improperly sized.
• Check motor size for your application.
• Contact your Allen-Bradley Support
Representative.
A short circuit exists across the drive output
terminals.
Check wiring between the axis and the motor.
Logic supply circuits have malfunctioned or AC
output is incorrectly wired.
• Check wiring between the axis and the
motor.
• Check power wiring between the axis and
the motor.
• Check resolver wiring between the system
module and the motor.
PosSoftOvertravel
Fault
(Ax: +Soft Ovrtrvl)
Axis position exceeded
maximum software
positive travel limit.
Positive travel limit set too high.
• Jog motor to within limits.
• Increase travel range limits.
NegSoftOvertravel
Fault
(Ax: -Soft Ovrtrvl)
Axis position exceeded
maximum software
negative travel limit.
Negative travel limit set too low.
• Jog motor to within limits.
• Increase travel range limits.
PosHardOvertravel
Fault
(Ax: +Hard Ovrtrvl)
Axis tripped positive hard
overtravel limit switch.
Axis moved beyond the physical travel limits.
• Disable checking and jog motor to within
limits.
• Move motor manually to within limits.
NegHardOvertravel
Fault
(Ax: -Hard Ovrtrvl)
Axis tripped negative hard
overtravel limit switch.
Axis moved beyond the physical travel limits.
• Disable checking and jog motor to within
limits.
• Move motor manually to within limits.
MotFeedbackFault
(Ax: Mtr Fdbk AQB)
Motor Encoder State Error
Motor encoder has encountered an illegal state
transition.
• Use shielded cables with twisted pair
wires.
• Route the feedback away from potential
noise sources.
• Check the system grounds.
• Replace the motor/encoder.
MotFeedbackFault
(Ax: Mtr Fdbk Comm)
Communication was not
established with an
intelligent (i.e. Stegmann)
encoder.
The encoder feedback signal is lost.
• Check motor feedback wiring
• Reset faults
MotFeedbackFault
(Ax: Mtr Fdbk Loss)
The feedback wiring is
open, shorted, or missing.
Open or short circuit has occurred on feedback
wiring.
Check the feedback cable connectors/wiring
to the system module and motor.
The feedback wiring or termination to system
module is incorrect.
Check the feedback cable connectors/wiring
to the system module and motor.
The motor feedback might be bad. Replace the motor feedback.
Fault Message
RSLogix (HIM):
Description: Potential Cause is: Possible Resolution is: