27
777S (NEMA 4X ENCLOSURE), Cont.
I/O (Input/Output) Cable Installation
Removal of the I/O cable from the 778I
NOTE: Each wire of the I/O cable is tagged with a number label that corresponds to the labels
on the circuit board for terminal connections to the P17 terminal block.
1. Release the 2 clamps securing the enclosure cover on the 778I, then open the cover
exposing the internal circuit board, I/O cable and relays.
2. Locate the I/O cable and I/O terminal block, P17.
3. Press down on the release bar of the terminal for the # 1 wire and remove the wire.
4. Repeat the procedure until all of the wires have been removed from the terminal block.
5. Loosen the gland connector for the I/O cable. The gland connector for the I/O cable is
located on the left-hand side end of the enclosure (the large connector).
6. Pull the I/O cable through the gland connector and out of the 778I enclosure.
Installation of the I/O cable in the 777S
1. To open the front cover on the 777S enclosure, loosen all four retaining screws and rotate
each of the clips to the side.
DO NOT
remove these screws. Fully open the front cover of
instrument exposing the internal circuit boards.
NOTE: If the 778D Digital I/O Interface card has not been installed, following the installation
guide provided with the card, install it in the 777S before proceeding.
2. Loosen the gland connector for the I/O cable. The gland connector for the I/O cable is
located on the bottom of the enclosure on the right-hand side (the large connector).
3. From inside the enclosure, slip the loose wires of the I/O cable through the gland connector
and out of the 777S enclosure.
4. Connect the I/O cable to the interface card, remove the excess cable from within the
instrument enclosure and securely tighten the cable gland connector. Do not over-tighten
the connector, but make certain it is snug.
5. Close the cover, rotate each of the clips back to the locking position, and tighten the four
retaining screws.
Re-Installation of the I/O cable in the 778I
NOTE:
Each wire of the I/O cable is tagged with a number label that corresponds to the labels
on the circuit board for terminal connections to the P17 terminal block.
1. Slip the I/O cable through the gland connector and into the 778I enclosure.
2. Connect each of the wires to the I/O terminal block matching the labels on the circuit board
for terminal connections with the labels on the wire of the I/O cable.
3. To terminate, first press down on the release bar for the terminal, insert the wire into the
opening then allow the release bar to return to its original position, locking the wire in place.
Repeat the procedure until all of the wires are in place.
4. After all terminations have been made, remove the excess cable from within the instrument
enclosure and securely tighten the cable gland connector. Do not over-tighten the
connector, but make certain it is snug.
5. Close the 778I enclosure cover and secure with the 2 clamps released previously.
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