- General Electric Computer Accessories User Manual

GEH-6385 Reference and Troubleshooting, 2300 V Drives Chapter 4 Wizards •
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• 4-9
The following are descriptions of bridge test failure messages.
Error Message Description/Procedure
Short circuit detection test
failed. Check for one or
more of the following.
An undesirable conductive path was detected in the
drive. This message will be followed by messages
describing the nature of the test failure.
POSSIBLE SHORTED
DEVICES:
All IGBTs and diodes that may be shorted will be
listed. However, the short circuit detection may have
been caused by a bad gate connection or IGBTs not
switching on. This will also be listed in the following
message. Check for shorted IGBTs and clamp
diodes first.
POSSIBLE DEVICES WITH
BAD GATE CONNECTIONS
OR ARE NOT SWITCHING
ON:
All IGBTs which returned a gate drive fault during
the test will be listed. The fault could have been
caused by a shorted device as listed in the previous
message, or one of the following problems:
Bad connection between the IGDM gate drive board
and the IGBT listed
Defective IGDM board on the IGBT listed
Defective IGBT listed
Open circuit detection test
did not run.
The open circuit detection test does not run if the
short circuit detection test fails.
Open circuit detection test
failed. Check for one or
more of the following.
An expected conductive path was not detected or a
current feedback was incorrect or missing. This
message will be followed by messages describing
the nature of the test failure.
POSSIBLE OPEN
DEVICES:
All IGBTs, diodes, and load connections that may be
opened will be listed. However, the open circuit
detection may have been caused by a current
feedback (shunt) error.
POSSIBLE SHUNT
ERRORS:
All possible shunt errors will be listed. If shunt
connections appear to be correct, check for correct
current scale and offset variables in the drive.
Voltage feedback evaluation
was not performed.
The voltage feedback evaluation is not performed if
the short circuit detection test or the open circuit
detection test fails.
Voltage feedback evaluation
failed. Check for one or
more of the following.
Correct voltage feedbacks were not measured. This
message will be followed by messages describing
the nature of the test failure.
POSSIBLE VOLTAGE
FEEDBACK ERRORS:
All voltage feedbacks that did not match expected
values will be listed.
Dynamic Brake Cell Test did
not run.
The Dynamic Brake Cell Test is not performed if the
short circuit detection test, open circuit detection
test, or the voltage feedback evaluation fails.
Dynamic Brake Cell Test
failed. Check for one or
more of the following.
One of the following dynamic brake tests failed:
Dynamic brake short circuit detection test
Dynamic brake open circuit detection test
Dynamic brake voltage feedback evaluation
This message will be followed by messages
describing the nature of the test failure.