Areva MiCOM P921, Technical Manual

Page: 171 / 376

Technical Guide P92x/EN FT/E11
User Guide
MiCOM P921-P922-P923 Page 93/110
Alarms can be classified as minor or major faults :
· Minor fault : the protection functions of the relay are still active. The watchdog
contact is in the “relay healthy” position.
The acknoledgment of those alarms can be done by pressing the 0 key
Alarm Type Significance Solution
COMM. ERROR
Minor
Communication error Check the RS485
connection at the rear of
the relay
CLOCK ERROR
Minor
Fault of the internal clock
(P922 and P923 only)
Change the date and time
via the front panel or the
communication links
RAM ERROR*
Minor
Fault in the non-volatile RAM
memory
Stop and start again the
relay (power off/on) :
check also the lithium
battery.
BATTERY FAIL*
Minor
Fault of the battery Check if the battery is flat
or not correctly in place.
* The "RAM" and "Battery failure" alarm messages can be configured yes or no in
"CONFIGURATION /Alarms" menu.
· Major fault : the protection functions of the relay are stopped. The watchdog
contact is in the “relay failed” position.
The acknoledgment of those alarms is impossible : the only way to reset the alarms is
the disappearance of the fault.
Alarm Type Significance Solution
EEPROM ERROR
DATA Major
Fault in the EEPROM
memory (data zone)
Send back the relay to
A REVA After Sales
Services
VT ERROR
Major
Fault in the acquisition chain
of analogue signals
Send back the relay to
A REVA After Sales
Services
EEPROM ERROR
CALIBR. Major
Fault in the EEPROM
memory (calibration zone)
Send back the relay to
A REVA After Sales
Services
WATCH DOG
Major
Fault in the internal circuits
of the relay
Send back the relay to
A REVA After Sales
Services