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489 GENERATOR MANAGEMENT RELAY – INSTRUCTION MANUAL
CHAPTER 6: ACTUAL VALUES
6.8
Diagnostics
6.8.1
Diagnostic Messages
In the event of a trip or alarm, some of the actual value messages are very helpful in
diagnosing the cause of the condition. The 489 will automatically default to the most
important message. The hierarchy is trip and pretrip messages, then alarm messages. In
order to simplify things for the operator, the Message LED (indicator) will flash prompting
the operator to press the
MESSAGE
X
key. When the
MESSAGE
X
key is pressed, the 489
will automatically display the next relevant message and continue to cycle through the
messages with each keypress. When all of these conditions have cleared, the 489 will
revert back to the normal default messages.
Any time the 489 is not displaying the default messages because other actual value or
setpoint messages are being viewed and there are no trips or alarms, the Message LED
(indicator) will be on solid. From any point in the message structure, pressing the
MESSAGE
X
key will cause the 489 to revert back to the normal default messages. When
normal default messages are being displayed, pressing the
MESSAGE
X
key will cause the
489 to display the next default message immediately.
EXAMPLE:
If a thermal model trip occurred, an RTD alarm may also occur as a result of the overload.
The 489 would automatically default to the
CAUSE OF LAST TRIP
message at the top of the
A1 STATUS
ZV
LAST TRIP DATA
queue and the Message LED would flash. Pressing the
MESSAGE
X
key cycles through the time and date stamp information as well as all of the
pre-trip data. When the bottom of this queue is reached, an additional press of the
MESSAGE
X
key would normally return to the top of the queue. However, because there is
an alarm active, the display will skip to the alarm message at the top of the
A1 STATUS
ZV
ALARM STATUS
queue. Finally, another press of the
MESSAGE
X
key will cause the 489 to
return to the original
CAUSE OF LAST TRIP
message, and the cycle could be repeated.
LAST TRIP DATA:
CAUSE OF LAST TRIP:
Overload
TIME OF LAST TRIP:
12:00:00.0
DATE OF LAST TRIP
Jan 01 2002
↓
↓
↓
ANALOG INPUT 4
PreTrip: 0 Units
