still isolated and the IED is in test mode. Before removing the test handle, check the
measured values in the IED.
Not until the test handle is completely removed, the trip and alarm circuits are restored for
operation.
Verify that the contact sockets have been crimped correctly and that they
are fully inserted by tugging on the wires. Never do this with current
circuits in service.
Current circuit
1. Verify that the contacts are of current circuit type.
2. Verify that the short circuit jumpers are located in the correct slots.
Voltage circuit
1. Verify that the contacts are of voltage circuit type.
2. Check that no short circuit jumpers are located in the slots dedicated for voltage.
Trip and alarm circuits
1. Check that the correct types of contacts are used.
4.10 Checking the binary input/output circuits
Do not insert anything else to the female connector but the corresponding
male connector. Inserting anything else (such as a measurement probe)
may damage the female connector and prevent a proper electrical contact
between the printed circuit board and the external wiring connected to the
screw terminal block.
4.10.1 Binary input circuits
Preferably, disconnect the binary input connector from the binary input cards. Check all
connected signals so that both input level and polarity are in accordance with the IED
specifications.
1MRK 504 165-UUS - Section 4
Starting up
Transformer protection RET670 2.2 ANSI 55
Commissioning manual
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