Voting Units

The Voting Units SS822Z, SS823 and SS833 have been

specifically designed to be employed as a control

unit within a redundant power supply configuration. The output connections from two Power Supply

Units are connected to the Voting Unit. The Voting

Unit separates the redundant Power Supply Units, supervises the voltage supplied, and generates supervision signals to be connected to the power consumer.

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 levels, are factory preset.

High Integrity

The AC 800M High Integrity and the connected S880

High Integrity I/O system (including field power)

shall be supplied from a SELV or PELV power supply

(e.g. SD83x) connected through the power voter

SS823. The SS823 Voting Unit has double overvoltage protection circuit, limiting the output voltage to

max 30 VDC. It is also able to detect both short and

open circuit in the voting element.

The SS822Z and SS823 units is also G3 compliant.