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CHAPTER 3: INTERFACES
Self-test errors
CAUTION:
339 MOTOR PROTECTION SYSTEM – INSTRUCTION MANUAL
Example of a Phase IOC1 operation - phase A:
Phase IOC1 function: Trip
Cause <Function>
The first line contains information of the cause of operation (the name of the operated
element), and the element function.
State: Operate
This line from the display shows the state of the element: Pickup, Operated, Alarm.
Phase: A
The last line from the display shows the phase that picked up or operated.
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.
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 3-7: Typical Self-test warning
A4 TARGET MESSAGES
A4 TARGET MESSAGES
Ph IOC1 Trip
State: Operate
▼
Phase:A
UNIT FAILURE:
Contact Factory:
Error code:1
FRONT CONTROL PANEL INTERFACE
3–9
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