Rockwell Automation 1771-P4R_P6R Allen-Bradley Redundent Power Installation Instructions - Manual (Page 8)

Allen-Bradley Redundant Power Supplies 8
Publication 1771-IN030B-EN-P - July 2002
Connect the Redundancy Cables
The power supply redundancy cables (A–B pt. no. 941201–02) allow
the power supplies to communicate load-sharing data. The two
connectors on each supply are in parallel to permit three or four
supplies to be daisy-chained together in a redundant system.
To connect the cables:
1. Connect the redundancy cable between the connectors labeled P/S
REDUNDANT on the power supply as shown below.
Connecting the Redundancy Cables for a 2, 3, or 4 Supply System
2 powerĆsupply system 3 powerĆsupply system 4 powerĆsupply system
Cable pt. no. A-B 941201-02
(supplied with power supply)
2. Loop the cable over the top of the I/O chassis to avoid picking up
signals induced from I/O wiring.
!
WARNING
When you insert or remove the module while
backplane power is on, or you connect or
disconnect the alarm relay, ac power, or
redundancy cable with field power applied, an
electrical arc can occur. This could cause an
explosion in hazardous location installations. Be
sure power is removed or the area is nonhazardous
before proceeding.
Wire the Alarm Relay
A 3-position terminal block labeled RELAY on the front panel of the
module provides you with a means of communicating the status of
the power supply to some alarm device. The contacts on the relay
are rated at 1/6 HP, 250V ac, 1 Amp, 30V dc maximum.
The relay energizes within 0.5 seconds after sufficient input power is
applied and no error conditions have been encountered. The error
conditions include 5V output overvoltage, undervoltage, or
overcurrent and internal reference error. The relay de-energizes
within 10 seconds following detection of an error condition or loss of
power. Contact bounce may occur for 100 ms.