Diagnostics; Diagnostic Messages For Operators - GE 489 Instruction Manual

5.8 DIAGNOSTICS

5.8 DIAGNOSTICS
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
NEXT
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
NEXT
are being displayed, pressing the
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
LED would flash. Pressing the
data. When the bottom of this queue is reached, an additional press of the
the queue. However, because there is an alarm active, the display will skip to the alarm message at the top of the
ACTUAL VALUES \ ALARM STATUS
message, and the cycle could be repeated.
CAUSE OF LAST TRIP
LAST TRIP DATA:
5
ACTIVE ALARMS:
START BLOCK
LOCKOUTS:
When the RESET has been pressed and the hot RTD condition is no longer present, the display will revert back to the nor-
mal default messages.
5-26
key is pressed, the 489 will automatically display the next relevant message and
NEXT
key will cause the 489 to display the next default message immediately.
NEXT
message at the top of the
key cycles through the time and date stamp information as well as all of the pre-trip
NEXT
queue. Finally, another press of the
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
STATOR RTD #1
ALARM: 135°C
OVERLOAD LOCKOUT
BLOCK: 25 min
489 Generator Management Relay

5.8.1 DIAGNOSTIC MESSAGES FOR OPERATORS

A1 ACTUAL VALUES \ LAST TRIP DATA
key would normally return to the top of
NEXT
key will cause the 489 to return to the original
NEXT
NEXT
5 ACTUAL VALUES
queue and the Message
A1
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