ABB S800, Product Manual

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Section 2 Product Description Power Supplies
3BSE015969-600 A 91
Power Supplies
The power supplies SD831, SD832, SD833, and SD834(24 V output) can be used to
power processor modules and S800 I/O modules, through the processor unit, and to
power 24 V field circuits (optional). The primary side can connect to industrial
mains installation class III (IEC664).
SD83x is a switch-mode power supply unit which converts the mains voltage to
24 volts d.c. The outputs are protected and can operate with resistive, capacitive,
and constant power loads. These power supplies can be utilized for non-redundant
and redundant applications. Only SD834 can be used in parallel connection to
increase output power, 2*SD834.
Redundant applications require diode voting units SS823 or SS832. The voting unit
SS823 has one power OK signal. Two SS823 can never be configured in parallel to
achieve more current. SS832 can be used directly for load up to 10 A. For loads up
to 20 A, two SS832 modules must be used. The signals can connect to the SA or SB
inputs of the Communication interface module, or to an Optical ModuleBus Modem
(to monitor power status in 1:1 redundant mains configurations.)
In a parallel connections, the lifetime will decrease due to not perfect load sharing.
To get a better load sharing the output voltage from the power supply units should
be adjusted to the same value. Each power supply should be connected to the load
via a cable of the same area and length as the others. The length should be > 1 m and
the area not bigger than necessary.
Table 9. Power Supplies
Module Type Description
SD822Z Power Supply 115/230 V a.c./24 V d.c. 5 A

Rated insulation voltage 300 V.
SD831 Power Supply 100/120 V a.c./24 V d.c. 3 A

Rated insulation voltage 300 V.
SD832 Power Supply 100/240 V a.c./24 V d.c. 5 A

Rated insulation voltage 300 V.
SD833 Power Supply 100/120 V a.c./24 V d.c. 10 A

Rated insulation voltage 300 V.