ABB AC 800M User Manual

Section 2 Installation Installing the SS822 Voting Unit
3BSE 027 941 R301 81
Installing the SS822 Voting Unit
The SS822 voting unit is used to connect two redundant power supplies to a
common load. Depending on the system configuration requirements, the two
redundant power supplies may be connected to completely separate mains supplies
or to the same mains supply, as shown in Figure 19 on page 81.
Use the following procedure to install the voting unit SS822:
1. Mount the voting unit SS822 onto the DIN-rail, adjacent to the power supplies.
2. Connect the voting unit to the selected SD821/822/823 power supply units, in
required configuration. See Figure 19 on page 81.
3. Connect the SS822 voting unit to the processor unit. Figure 20 on page 82
shows the connection to PM861/PM864 in redundant configuration.
Figure 19. Redundant Power Supply
OK F
OK
A+ B+ L+
SS822
F
+
+
AB
L+ L–
L+ L+ L– L–
NLPE
OK
SD821
L+ L+ L– L–
NLPE
OK
SD821
SA
SB
L–
L+
Supervision
signals to
CPU unit via
+24 V
0V
From Mains
Breaker
Protective Ground
TP830

ABB AC 800M Specifications

General

Brand	ABB
Model	AC 800M
Category	Controller
Language	English