ABB RELION RET670, Installation And Commissioning Manual

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6.5.1 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 IEDs specifications.
6.5.2 Binary output circuits
Preferably, disconnect the binary output connector from the binary output cards.
Check all connected signals so that both load and polarity are in accordance with
IED specifications.
6.6 Checking optical connections
Check that the Tx and Rx optical connections are correct.
An IED equipped with optical connections requires a minimum
depth of 180 mm for plastic fiber cables and 275 mm for glass fiber
cables. The allowed minimum bending radius has to be checked
from the optical cable manufacturer.
1MRK 504 088-UEN C
Section 6
Checking the external optical and electrical connections
75
Installation and commissioning manual