GE DGP Series Instruction Manual page 167

6 SERVICING
A critical failure indicates total interruption of the protection function. When an extended failure is detected on
one of the modules (excluding the power supply) the critical alarm relay will drop out, and the MMI LED will turn
red. Remove and re-apply the DC power to bring up the FAIL message on the display. If the DGP successfully
restarts, the LED will turn green.
The FAIL message has the format FAIL xxx . The xxx field represents the numeric code indicating the nature
of the critical failure. The FAIL message remains on the display until a key is pressed or until the DGP restarts
successfully (with no self-test failures).
As an alternative, the INFORMATION–STATUS command can be used to display the failure type
directly on the MMI.
NOTE
A Failure message may appear in the Events or on the display, but not be displayed from INFORMATION–
STATUS. This is the result of a Removable Critical Alarm, REMCRIT, shown in Section 6.4: ERROR CODES.
This is caused by the DGP detecting a critical alarm, then later detecting that the condition has cleared up, and
thus being able to restore protection.
LOCATING THE DEFECTIVE MODULE:
Use Tables 6–6: ERROR MESSAGES AT STARTUP, 6–7: ERROR MESSAGES AT RUNTIME, or the INFOR-
MATION–STATUS command, to isolate the cause of the failure. When the suspected module is found, power
down the unit and replace it. Re-apply power. If the FAIL message is gone, then the unit has been successfully
repaired. If the message has changed, it is possible that another module requires replacement.
A non-critical failure indicates a possible interruption in the relay's protection, but not a total loss. When a
WARN condition occurs, the DGP system's non-critical alarm contact will close. The LED will remain green.
Turn off the DC input power, then re-apply. The WARN xxx message should appear if the failure still exists.
The WARN message has the format WARN xxx . The xxx field represents the numeric code indicating the
nature of the failure. The WARN message remains on the display until a key is pressed or until the DGP
restarts successfully (with no self-test failures). See Table 6–6: ERROR MESSAGES AT STARTUP on page 6–
7 for the list of Warning codes and their meanings.
As an alternative to using the table of warnings, the INFORMATION–STATUS command can be used
to display the warning type directly on the MMI.
NOTE
A Failure message may appear in the Events or on the display, but not be displayed from "Informa-
tion Status". This is the result of a Removable Non-Critical Alarm, REMNONCRIT in Table 6–7:
ERROR MESSAGES AT RUNTIME on page 6–9. This is caused by the DGP detecting a non-critical alarm,
then later detecting that the condition has cleared up, and thus being able to restore protection.
LOCATING THE DEFECTIVE MODULE:
Use Tables 6–6: ERROR MESSAGES AT STARTUP, 6–7: ERROR MESSAGES AT RUNTIME, or the INFOR-
MATION–STATUS command to isolate the cause of the failure. Power down the unit and replace the sus-
pected module if appropriate. Re-apply power and the WARN message should clear. If the WARN message is
gone, then the unit has been successfully repaired. If the message has changed, it is possible that another
module requires replacement.
GE Power Management
6.3.4 SERVICING A NON-CRITICAL FAILURE WARN
DGP Digital Generator Protection System
6.3 TROUBLESHOOTING
6.3.3 SERVICING A CRITICAL FAILURE FAIL
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