8
Rockwell Automation Publication 1756-IN620D-EN-P - October 2018
ControlLogix Redundant Power Supply
Connect the power as shown in the following figure.
Connect the Solid-state Relay
A solid-state relay on your redundant power supplies can be connected to any compatible monitoring or signaling device. This connection indicates
if the supplies are functioning properly.
The relays are closed during standard operation. The solid-state relay contacts open if one of these events occurs:
• One or more of the supplies fail.
• In this case, the contact opens on the failed supply (or supplies), and the input module alerts you to the failure through the controller
program.
• The connected redundant power supplies are turned OFF.
When you use the solid-state relay annunciator function, connect a compatible source voltage to a contact terminal. Then connect the other
terminal to the monitoring or signaling device.
IMPORTANT
The voltage input connections of the power supplies are auto-sensing.
You do
not
use a jumper, for example, a 120/240V AC jumper, when connecting external power to the power supply, as shown in the previous figure.
Item
Description, 1756-PA75R/A (AC)
Description, 1756-PB75R/A (DC)
1
L1 (high side of line power)
Not used
2
Not used
DC+ (positive supply)
3
L2 (low side of line power)
Not used
4
Not used
DC- (negative supply return)
5
Protective Earth. Attach to chassis ground lug or ground bus. See the ControlLogix Chassis Installation Instructions,
publication
1756-IN621
, for details.
ATTENTION:
Annunciator cable length must be less than 10 m (32.8 ft).
The annunciator output is rated only for resistive loads. Do not use it to drive the coil of an electromagnetic relay.
1756-PA75R/A (AC)
1756-PB75R/A (DC)
1
3
2
5
4
1
3
2
5
4