Technical Guide P12y/EN FT/D22
User Guide
MiCOM P125/P126/P127 Page 5/108
The user acknowledges and clears the alarm messages from the LCD by using 0.
The user can acknowledge each alarm message one by one or all by going to the
end of the list to acknowledge, and clear, all the alarm messages by using 0.
The control of the ALARM LED (LED 2) is directly assigned to the status of the alarm
messages stored in the memory.
If one or several messages are NOT READ and NOT ACKNOWLEDGED, the ALARM
LED (LED 2) flashes.
If all the messages have been READ but NOT ACKNOWLEDGED, the ALARM LED
(LED 2) lights up continuously.
If all the messages have been ACKNOWLEDGED, and cleared, if the cause was
reset,, the ALARM LED (LED 2) is extinguished.
2.4.2 Relay Hardware or Software Warning Messages
Any software or hardware fault of the MiCOM relay generates a "hardware/software
alarm" that is stored in memory as a "Hardware Alarm". If several hardware alarms
are acquired they are all stored in their order of appearance. The warning messages
are presented on the LCD in reverse order of their detection (the most recent first and
the oldest last). Each warning message is numbered and the total stored is shown.
The user can read all warning messages by using 1, without entering the password.
The acknowledgement, and clearing, of warning messages caused by internal relay
hardware or software faults is not possible. A warning message can only be made to
disappear if the cause of the fault has been removed.
The control of the WARNING LED (LED 3) is directly assigned to the status of the
warning messages stored in the memory.
If the internal hardware or software fault is major (i.e. the relay cannot perform
protection functions), the WARNING LED (LED 3) lights up continuously.
If the internal hardware or software fault is minor (i.e. a communication failure that
has no influence on the protection and automation functions), the WARNING LED
(LED 3) will flash.
Warning messages caused by internal hardware or software faults are:
<<COMM.ERROR>> : Communications faulty
<<EEPROM ERROR DATA>> : Settings corrupted
<<EEPROM ERROR CALIBR.>> : Calibration failure
<<CT ERROR>> : Analogue channel in fault
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