5.1.4 EXTERNAL WIRING
Caution:
Check that the external wiring is correct according to the relevant IED and
scheme diagrams. Ensure that phasing/phase rotation appears to be as
expected.
5.1.5 WATCHDOG CONTACTS
Using a continuity tester, check that the Watchdog contacts are in the following states:
Terminals De-energised contact
11 - 12 on power supply board Closed
13 - 14 on power supply board Open
5.1.6 POWER SUPPLY
Depending on its nominal supply rating, the IED can be operated from either a DC only or an AC/DC
auxiliary supply. The incoming voltage must be within the operating range specified below.
Without energising the IED 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 - 54 V N/A 19 to 65 V N/A
48 - 125 V 30 - 100 V 37 to 150 V 24 - 110 V
110 - 250 V 100 - 240 V 87 to 300 V 80 to 265 V
Note:
The IED can withstand an ac ripple of up to 12% of the upper rated voltage on the dc auxiliary supply.
Warning:
Do not energise the IED or interface unit using the battery charger with the
battery disconnected as this can irreparably damage the power supply
circuitry.
Caution:
Energise the IED only if the auxiliary supply is within the specified operating
ranges. If a test block is provided, it may be necessary to link across the front
of the test plug to connect the auxiliary supply to the IED.
5.2 PRODUCT CHECKS WITH THE IED ENERGISED
Warning:
The current and voltage transformer connections must remain isolated from
the IED for these checks. The trip circuit should also remain isolated to
prevent accidental operation of the associated circuit breaker.
MiCOM P747 Chapter 14 - Commissioning Instructions
P747-TM-EN-1 351
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