P92x/EN CM/E11 Techncal Guide
Commissioning Guide
Page 10/28 MiCOM P921-P922-P923
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4.1.6 Auxiliary supply
The relay can be operated from either a DC only or an AC/DC auxiliary supply
depending on the relay’s nominal supply rating. The voltage must be within the
operating range specified in Table 2.
Without energising the relay, measure the auxiliary supply to ensure it is within the
operating range.
Nominal supply rating
DC [AC RMS]
DC operating
range
AC operating
range
24-60V [-] 19 to 72V -
48-150V 38 to 180V -
130-250V [100/250V] 104 to 300V 88 to 300V
TABLE 2 : OPERATIONAL RANGE OF AUXILIARY SUPPLY
It should be noted that the relay can withstand an AC ripple of up to 12 % of the
upper rated voltage on the DC auxiliary supply.
DO NOT ENERGISE THE RELAY USING THE BATTERY CHARGER WITH THE BATTERY
DISCONNECTED AS THIS CAN IRREPARABLY DAMAGE THE RELAY'S POWER SUPPLY
CIRCUITRY
ENERGISE THE RELAY IF THE AUXILIARY SUPPLY IS WITHIN THE OPERATING RANGE.
IF AN MMLG TEST BLOCK IS PROVIDED, IT MAY BE NECESSARY TO LINK ACROSS
THE FRONT OF THE TEST PLUG TO CONNECT THE AUXILIARY SUPPLY TO THE RELAY.
4.2 With the relay energised
THE FOLLOWING GROUP OF TESTS VERIFY THAT THE RELAY HARDWARE AND
SOFTWARE IS FUNCTIONING CORRECTLY AND SHOULD BE CARRIED OUT WITH
THE AUXILIARY SUPPLY APPLIED TO THE RELAY.
THE VOLTAGE TRANSFORMER CONNECTIONS MUST REMAIN ISOLATED FROM THE
RELAY FOR THESE CHECKS.
4.2.1 Watchdog contacts
Using a continuity tester, check the watchdog contacts are in the states given in Table
1 for an energised relay.
4.2.2 Date and time
Set the date and time to the correct values. Refer to Chapter P92x/EN FT of the
Technical guide.
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