Rockwell Automation 1333 Drive, 3/4-5HP, 230-575V Series D - Manual (Page 111)

Preventive Maintenance and
Troubleshooting Common Drive Problems
Appendix B
B-4
Auxiliary Interlock Trip -- AU is Displayed
The Reason It is possible that the drive was stopped by an external
interlock. External interlocks (a thermal overload relay or an external
sequence circuit for example), are connected to terminals 16 and 17 at the
Control and Signal Wiring Terminal Block.
Precheck Procedure Refer to Chapter 4 Installation and Wiring for a
detailed explanation of external interlocks.
Operating Error -- OP is Displayed
The Reason The drive must always receive a valid stop command before it
can run. This fault will be displayed and the drive will not start if:
1. The local stop pushbutton is pressed to stop the drive and Parameter 8 is
set to 1 or 3.
2. A remote stop signal is sent and Parameter 8 is set to 2.
3. Parameter 8 is set to 1 or 3 and an external stop signal is not present
when power is applied to the drive.
Precheck Procedure
1. Send an external stop signal to clear the fault, then try again.
2. Press the local stop pushbutton to clear the fault, then try again.
3. Ensure that an external stop signal is present before reapplying power to
the drive, then try again.
Operating Error -- CPU is Displayed
The Reason CPU is an internal software communications error. A CPU
error will not be stored in the drive fault buffers.
Precheck Procedure
Clear the fault by removing then reapplying power to the drive.