GE 489 - Manual (Page 158)

5-26 489 Generator Management Relay GE Multilin
5.8 DIAGNOSTICS 5 ACTUAL VALUES
5
5.8DIAGNOSTICS 5.8.1 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
key. When the 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
key will cause the 489 to revert back to the normal default messages. When normal default messages
are being displayed, pressing the 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 ÖØ LAST TRIP DATA queue and the Message LED
would flash. Pressing the 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 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
ÖØ ALARM STATUS queue. Finally, another press of the key will cause the 489 to return to the original CAUSE OF
LAST TRIP message, and the cycle could be repeated.
When the has been pressed and the hot RTD condition is no longer present, the display will revert back to the nor-
mal default messages.
LAST TRIP DATA:
CAUSE OF LAST TRIP:
Overload
TIME OF LAST TRIP:
12:00:00.0
DATE OF LAST TRIP
Jan 01 1992
↓
↓
↓
ANALOG INPUT 4
PreTrip: 0 Units
ACTIVE ALARMS: STATOR RTD #1
ALARM: 135°C
START BLOCK
LOCKOUTS:
OVERLOAD LOCKOUT
BLOCK: 25 min
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