Update Documentation
P521/EN AD/B21
MiCOM P521
Page 3/24
USER GUIDE (P521/EN FT/B11)
3.4.2
Relay hardware or software alarms
Any software or hardware fault of the MiCOM relay generates a "hardware/software
alarm". If several alarms are generated they are all stored in their order of
appearance. The alarms are displayed in reverse order (the most recent first and the
oldest last). Each message is numbered and the total number of messages is
indicated below.
The user can read all the alarm messages with the aid of
&
,
without entering the
password.
The acknowledgement of the relay alarm messages is IMPOSSIBLE if the fault is still
present. The alarm can only be acknowledged when the cause of the alarm has
disappeared.
The management of the WARNING LED is directly linked to the status of the alarms
stored in the memory.
Þ
If the fault is major (the relay cannot perform protection functions), the
WARNING LED is continuously illuminated and the watchdog contact will
operate.
Þ
If the fault is minor (no influence on the protection and automation function
e.g. SCADA communication failure), the WARNING LED flashes. This will
not cause operation of the watchdog contact.
Possible Hardware or Software alarm messages:
Major fault
SETTING ERROR:
Setting error occurred due to data
memory fault
EEPROM ERROR CALIBR.:
Calibration memory faulty
CT ERROR:
Analogue channel faulty
PROT. COMMS FAIL:
Protections comms card faulty
DEFAULT CONFIG.:
Factory settings restored due to data
memory fault. This message will also be
displayed following a firmware upgrade.
Minor fault-
RAM ERROR:
RAM supplied by battery faulty
BATTERY FAIL:
Battery faulty (flat or not correctly fitted)
Note:
The “Battery backed RAM memory” and “Battery failure” alarm
messages can be configured to display or not; YES or NO in
CONFIGURATION/Alarms menu. If NO is selected an alarm
will not be raised in the event of a Battery Fault.
COMM.ERROR:
Internal communications faulty
CLOCK ERROR:
Real time clock faulty
PROT. COMMS RECOVER:
Recovering from transient comms fault
(back-up protection available)
