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Troubleshooting the Drive
6-11
6.4.3 Accessing, Reading, and Clearing the Faults in the Error Log
The following procedure shows how to access and clear the error log. Note that you
cannot clear a single entry from the error log. The entire log, including all the fault
codes and the day and time stamp of each fault, will be cleared simultaneously using
this procedure.
SrL Communication
loss between
Regulator/PC/OIM
Serial port communication cable, PC
or OIM communication port setup.
Check connection cable and
communication port setup.
UAr Spurious host PC
comm interrupt
Regulator board failure. Replace Regulator board.
UbS Asymmetrical bus
fault. Look at the 3
LEDs on the Power
Module Interface
board. They
indicate which fault
has occurred by
flashing in unison.
1 = Input Ground
Fault;
2 = Asymmetrical
Bus;
3 = Slow Ramp
Rate of DC Bus
One of 3 differnet faults has occurred;
1. Input Ground Fault - Excessive
current flowing bwtween any of the
three input phases and earth ground.
2 . Asymmetrical Bus - When
measuring between the cap bank
midpoint and the +DC bus and -DC
bus, there is a 200 V or greater
mismatch.
3. Slow Ramp Rate of DC Bus - DC
bus did not change to the ful value
given time allowed. Can occur only at
power-up.
1. Check the connection from the
current transformer to the Bus Control
board.
2. Replace shorted capacitor, fix loose
connection, or replace discharge
resistor.
3. Turn on drive. If UbS is displayed,
turn drive off and then on again very
quickly. If the UbS fault goes away and
the DC bus charges, replace the Bus
Control board.
Table 6.3 – List of Fault Codes (Continued)
Code
Fault
Description Fault Cause Corrective Action
Step 1. Press the PROGRAM key.
The First Menu General parameters are
displayed. The PROGRAM LED will turn on.