Product specifications

SS822/SS823/SS832 Voting Unit (for Redundant Power Supply) Appendix A Hardware Units
374 3BSE036351-510 A
SS822/SS823/SS832 Voting Unit (for Redundant Power
Supply)
The Voting Unit has been specifically designed to be employed as a control unit
within a redundant power supply configuration. The output connections from two
Power Supply Units, (PSUs), are connected to the Voting Unit.
The Voting Unit separates the redundant PSUs, supervises the voltage supplied,
and generates supervision signals to be connected to the computer system. Green
LED’s, mounted on the front panel of the voting unit, provide a visual indication
that the correct output voltage is being delivered. Simultaneously with the green
LED illuminating, a voltage free contact closes the path to the corresponding “OK
connector”. Voting Unit trip level’s, are factory preset. Three different types of
voting units are available:
SS822 up to 20 A.
SS823 up to 20 A, with over voltage protections and enlarge diagnostics. 
Maximum output current 3.3 A 6 A
At ambient
temp < 45
o
C
12 A
At ambient
temp < 45
o
C
30 A < 4 s
Maximum ambient
temperature
(1)
55
o
C 55
o
C 55
o
C 55
o
C
Acceptable wire sizes
Power connection
terminals
Solid: 0.5 – 6 mm
2
Stranded wire: 0.5 – 4 mm
2
, 20 – 10 AWG
Recommended torque: 0.8 Nm
Acceptable wire sizes
DC-OK-signal terminals
Solid: 0.3 - 4 mm2
Stranded wire: 
0.3 - 2.5 mm2, 
26 - 12 AWG
(1) Mounting on a horizontal DIN rail.
Table 116. Technical Data PSU’s SD831, 832, 833 and 834 (Continued)
Parameter
SD831
Converter
SD832
Converter
SD833
Converter
SD834
Converter