Power Supply Modules
12
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The power supply modules are designed to operate in parallel with:
•
another 1771-P3, -P4, -P5 or -P5E power supply (Note: The
1771-P5 and -P5E power supplies are designed to operate in
parallel only with another 1771-P5.) (Refer to Table A and
Table C.)
•
a 1772-LSP, -LWP or -LXP processor (Refer to Table B.)
Note: Paralleling 2 modules, even when using different power
sources, does not provide redundancy.
If 2 power supplies are used, do not exceed specified isolation
voltages.
To parallel 2 modules, proceed as follows:
1. Make certain that both power supply module power switches are
off.
2. Connect the power supply paralleling cable (cat. no. 1771-CT)
from the P/S Parallel port on the first power supply module to the
P/S Parallel port on the second module as shown below. Note:
Route the cable around the top of the I/O chassis to avoid induced
voltages.
Paralleling Two Power Supply Modules
P/S
Parallel
24V
DC
24V dc
POWER
ON
P/S
ACTIVE
5A 32V
NORM BLOW
P/S
Parallel
P/S
ACTIVE
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Power Supply
Paralleling Cable
Cat. No. 1771ĆCT
24V dc
POWER
ON
5A 32V
NORM BLOW
24V
DC
Paralleling Power Supplies