AB Quality Allen-Bradley 1394, User Manual

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Publication 1394-5.0 — May 2000
9-12 Troubleshooting
Understanding Analog Servo System Axis Faults
The faults that apply to the Analog Servo System’s axis module
appear in the following table.
Fault Message: Description: Potential Cause: Possible resolution:
ATune Fault
The auto tune cycle has
exceeded two seconds. Motor is disconnected or not able to turn.
Connect the motor.
Motor power/resolver wiring is open or
improperly wired.
Check motor power/resolver wiring.
Axis enable has not been applied within
60 seconds of fault during auto tune.
• Increase the auto tune current limit to
increase motor torque.
• Decrease the auto tune velocity to decrease
the auto tune cycle time. You must apply
the enable signal within 60 seconds during
auto tune.
Bus Loss
The DC bus supply to the
axis module was lost. The slider connections may not be secure.
Check slider connections/termination strip.
An axis module’s bus link fuse has blown.
Replace the module.
Ring Write! The axis module is not set
to proper scaling. The slider connections may not be secure.
Check slider connections/termination strip.
The axis module is malfunctioning.
• Terminate signal common (TB1-19) to
chassis (PE) ground.
• Replace the module.
Fdbck Loss
(Resolver)
The resolver wiring is
open, shorted, or missing. Open or short circuit has occurred on
resolver wiring.
Check the resolver cable connectors/wiring to
the system module and motor.
The resolver wiring or termination to
system module is incorrect.
Check the resolver cable connectors/wiring to
the system module and motor.
The motor resolver might be bad.
Replace the motor resolver.
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.
Ovr Speed
Motor velocity exceeded
the overspeed trip limit. Motor velocity has exceeded the
overspeed value.
• Verify operating parameters.
• Verify application requirements.
Ovr temp The 1394 contains a
thermal sensor that senses
the internal ambient
temperature. The cabinet’s ambient temperature is
above rating.
Check the cabinet temperature
The machine’s duty cycle requires an
RMS current exceeding the continuous
rating of the controller.
Change the command profile to reduce speed
or increase time.
The airflow access to the 1394 is limited
or blocked.
Check airflow and re-route cables away from
the 1394.