Diagnostic Messages; Self-Test Warnings - GE Multilin 489 Instruction Manual

4.1.6

Diagnostic Messages

4.1.7

Self-Test Warnings

4–8
Courtesy of NationalSwitchgear.com
Diagnostic messages are automatically displayed for any active conditions in the relay
such as trips, alarms, or asserted logic inputs. These messages provide a summary of the
present state of the relay. The Message LED flashes when there are diagnostic messages
available; press the key until the relay displays
MENU
key, followed by the
MESSAGE
additional information and a complete list of diagnostic messages, refer to Diagnostic
Messages on page 6–32.
The 489 relay performs self test diagnostics at initialization (after power up), and
continuously as a background task to ensure every testable unit of the hardware and
software is functioning correctly. There are two types of self-test warnings indicating either
a minor or major problem. Minor problems indicate a problem with the relay that does not
compromise protection. Major problems indicate a very serious relay problem which
comprises all aspects of relay operation.
Upon detection of either a minor or a major problem the relay will:
• De-energize the self-test warning relay
• Light the self-test warning LED
• Flash a diagnostic message periodically on the display screen
The 489 self-test warnings are shown below.
Message
Self-Test Warning 1
Replace Immediately
Major
Self-Test Warning 2
Replace Immediately
Major
Self-Test Warning 3
Replace Immediately
Major
Self-Test Warning 5
Major
Replace Immediately
Self-Test Warning 6
Major
Replace Immediately
Self-Test Warning 7
Major
Replace Immediately
TARGET MESSAGES
key, to scroll through the messages. For
MESSAGE
Table 4–1: Self-Test Warnings
Severity
This warning is caused by detection of a
corrupted location in the program memory as
determined by a CRC error checking code. Any
function of the relay is susceptible to
malfunction from this failure.
This warning is caused by a failure of the
analog to digital converter. The integrity of
system input measurements is affected by this
failure.
This warning is caused by a failure of the
analog to digital converter. The integrity of
system input measurements is affected by this
failure.
This warning is caused by out of range reading
of self test RTD 13. The integrity of system
input measurements is affected by this failure.
This warning is caused by out of range reading
of self test RTD 14. The integrity of system
input measurements is affected by this failure.
This warning is caused by out of range reading
of self test RTD15. The integrity of system input
measurements is affected by this failure.
489 GENERATOR MANAGEMENT RELAY – INSTRUCTION MANUAL
CHAPTER 4: INTERFACES
, then press the
Description