CHAPTER 3: INTERFACES
FRONT CONTROL PANEL INTERFACE
345 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
3–7
Self-test errors
The relay performs self diagnostics at initialization (after power up), and continuously as a
background task to ensure that the hardware and software are 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 of the
power system. Major errors indicate a problem with the relay which takes it out of service.
CAUTION
CAUTION:
Self-Test Warnings may indicate a serious problem with the relay hardware!
Upon detection of a
minor
problem, the relay will:
•
Turn on the "TROUBLE" LED at the same time as the "IN SERVICE" LED is on.
•
Display the error on the relay display.
•
Record the minor self-test error in the Event Recorder.
Upon detection of a
major
problem, the relay will:
•
De-energize critical failure relay (Output Relay 7).
•
Inhibit operation of all other output relays (1 to 6).
•
Turn off the "IN SERVICE" LED; turn on the "TROUBLE" LED.
•
Flash the "ALARM" LED.
•
Display the cause of major self-test failure.
•
Record the major self-test failure in the Event Recorder.
Figure 6: Typical Self-test warning
Table 1: Minor Self-test Errors
Self-test Error
Message
Latched
Target
Message?
Description of
Problem
How Often the Test
is Performed
What to do
MAINTENANCE
ALERT: IRIG-B
Failure
No
A bad IRIG-B input
signal has been
detected.
Every 5 seconds*
Ensure IRIG-B cable is
connected, check cable
functionality (i.e. physical
damage or perform
continuity test), ensure
IRIG-B receiver is
functioning, and check
input signal level (it may
be less than specification).
If none of these apply,
contact the factory.
MAINTENANCE
ALERT: Clock
Not Set
No
Clock time is the
same as the default
time.
Every 5 seconds*
Set the date and time in
PRODUCT SETUP.
MAINTENANCE
ALERT: Comm
Alert 1, 2, or 3
No
Communication
error between CPU
and Comms board.
Every 5 seconds*
If alert doesn’t self-reset,
then contact factory.
Otherwise monitor
reccurences as errors are
detected and self-reset.
MAINTENANCE
ALERT:
Ethernet Link
Fail
No
Communication
error between 345
and Network.
Detected
Instantaneously
Check Ethernet cable and
Ethernet connection.
Check health of the
network. Check status of
external routers and
switches.
A4 TARGET MESSAGES
UNIT FAILURE:
Contact Factory:
Error code:1
