Understanding Analog Servo System Axis Faults - Allen-Bradley 1394 User Manual

9-12 Troubleshooting
Fault Message: Description:
ATune Fault
The auto tune cycle has
exceeded two seconds.
Bus Loss
The DC bus supply to the
axis module was lost.
Ring Write!
The axis module is not set
to proper scaling.
Fdbck Loss
The resolver wiring is
open, shorted, or missing.
(Resolver)
I(t) Fault
The output current is
exceeding the time-current
rating.
Ovr Speed
Motor velocity exceeded
the overspeed trip limit.
Ovr temp
The 1394 contains a
thermal sensor that senses
the internal ambient
temperature.
Publication 1394-5.0 — May 2000

Understanding Analog Servo System Axis Faults

The faults that apply to the Analog Servo System's axis module
appear in the following table.
Potential Cause:
Motor is disconnected or not able to turn.
Motor power/resolver wiring is open or
improperly wired.
Axis enable has not been applied within
60 seconds of fault during auto tune.
The slider connections may not be secure.
An axis module's bus link fuse has blown. Replace the module.
The slider connections may not be secure.
The axis module is malfunctioning.
Open or short circuit has occurred on
resolver wiring.
The resolver wiring or termination to
system module is incorrect.
The motor resolver might be bad.
Accel/decel command from position
controller is requiring peak current for an
excessive amount of time.
The machine friction, inertial load, and/or
viscous load is excessive.
The motor has been improperly sized.
A short circuit exists across the drive
output terminals.
Logic supply circuits have malfunctioned
or AC output is incorrectly wired.
Motor velocity has exceeded the
overspeed value.
The cabinet's ambient temperature is
above rating.
The machine's duty cycle requires an
RMS current exceeding the continuous
rating of the controller.
The airflow access to the 1394 is limited
or blocked.
Possible resolution:
Connect the motor.
Check motor power/resolver wiring.
• 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.
Check slider connections/termination strip.
Check slider connections/termination strip.
• Terminate signal common (TB1-19) to
chassis (PE) ground.
• Replace the module.
Check the resolver cable connectors/wiring to
the system module and motor.
Check the resolver cable connectors/wiring to
the system module and motor.
Replace the motor resolver.
Change the command profile to reduce speed
or increase time.
• Change the command profile to reduce
speed or increase time.
• Check for mechanical problems on the
machine.
• Check motor size for your application.
• Contact your Allen-Bradley Support
Representative.
Check wiring between the axis and the motor.
• 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.
• Verify operating parameters.
• Verify application requirements.
Check the cabinet temperature
Change the command profile to reduce speed
or increase time.
Check airflow and re-route cables away from
the 1394.