Not until the test handle is completely removed, the trip and alarm circuits arerestored for operation.Verify that the contact sockets have been crimped correctly and thatthey are fully inserted by tugging on the wires. Never do this withcurrent circuits in service.Current circuit1. Verify that the contacts are of current circuit type.2. Verify that the short circuit jumpers are located in the correct slots.Voltage circuit1. Verify that the contacts are of voltage circuit type.2. Check that no short circuit jumpers are located in the slots dedicated forvoltage.Trip and alarm circuits1. Check that the correct types of contacts are used.4.10 Checking the binary input/output circuits M11722-2 v4Do not insert anything else to the female connector but thecorresponding male connector. Inserting anything else (such as ameasurement probe) may damage the female connector and preventa proper electrical contact between the printed circuit board and theexternal wiring connected to the screw terminal block.4.10.1 Binary input circuits M11722-4 v3Preferably, disconnect the binary input connector from the binary input cards.Check all connected signals so that both input level and polarity are in accordancewith the IED specifications.4.10.2 Binary output circuits M11722-8 v3Preferably, disconnect the binary output connector from the binary output cards.Check all connected signals so that both load and polarity are in accordance withIED specifications.1MRK 505 378-UEN A Section 4Starting upLine differential protection RED670 2.2 IEC 57Commissioning manual
