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You can place these power-supply modules into any I/O module slot in any
current chassis (1771-A1B, -A2B, -A3B, -A4B, -A3B1, -PSC).
However, to place these power-supply modules into a superseded I/O
chassis (1771-A1, -A2, -A4), you must follow the restrictions in table B.
You can use two power supplies in the same I/O chassis to produce more
power by connecting them with a Power-Supply Paralleling Cable
(1771-CT). This connection is for communication between the two
supplies. If one supply has to shut down, it tells the second to turn off its
indicator. Although the adapter or in-chassis processor will be disabled, the
second supply will continue trying to operate until its DC output limits are
exceeded. Because the adapter or in-chassis processor is disabled,
paralleling two supplies does not provide redundancy.
To connect the paralleling cable:
1.
2.
3.
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Connect the paralleling cable between the P/S PARALLEL
connectors on the two supplies (figure 2).
Loop the paralleling cable over the top of the I/O chassis to avoid
picking up signals induced from I/O wiring.
Turn on the supplies simultaneously. If you don't, the first supply you
turn on may shut down due to an overcurrent condition.
3
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