Rockwell Automation Publication 1756-IN620D-EN-P - October 2018
5
ControlLogix Redundant Power Supply
Summary of Changes
We updated the torque requirement on pages
7
and
12
for these power supplies.
Components of the Redundant System
The following graphic (series C chassis depicted) shows the components of a redundant system in a typical configuration.
Removable Terminal Blocks (RTBs) for I/O Connections
WARNING:
EXPLOSION HAZARD
When you connect or disconnect the removable terminal block (RTB) with field side power applied, an electric arc can occur. This could cause an explosion in
hazardous location installations.
Be sure that power is removed or the area is nonhazardous before proceeding.
IMPORTANT
The ControlLogix redundant power supply system is designed to account for operational anomalies in only the power supply. The chassis adapter and power
supply cables are excluded.
Item
Description
Cat. No.
1
Redundant power supply
1756-PA75R/A and/or 1756-PB75R/A or 1756-PAXTR and/or 1756-PBXTR
2
Redundant power supply cable (Length = 0.91 m [3 ft])
1756-CPR2
(2)(3)
or 1756-CPR2D
(3)(4)
or 1756-CPR2U
(3)(4)
(2)
Cable bend radius is 12.7 cm (5.0 in.).
(3)
Cable bend radius can be greater than or less than the minimum mounting clearance of the chassis.
Always maintain
chassis minimum mounting clearance.
(4)
Requires 10.16 cm (4.0 in.) of clearance next to the chassis adapter.
3
Redundant power supply chassis adapter
1756-PSCA2 or 1756-PSCA2XT
4
Annunciator wiring
(1)
(Maximum length = 10 m [32.8 ft])
(1)
Optional user-provided annunciator wiring can be connected to the solid-state relay for status and for troubleshooting. See
page 8
for more information.
User-supplied
2
3
1
4