Section 2 Installation Power Supply
3BSE036351-510 A 63
Power Supply
Under normal circumstances, the power supply required by AC 800M Controller
and associated field equipment can be obtained from the plant’s standard
120/230 V AC mains supply.
Mains Net Filter
It is not necessary to use mains net filters when using the SD831/832/833/834
power supply units.
Mains Breaker
A mains breaker must be installed in the immediate vicinity of a controller
installation to allow for immediate total power supply disconnection to the
equipment, should the need arise. However, the prime function of the mains breaker
is to provide a means of isolating the power supply completely during maintenance.
The mains breaker must be installed in a location where it is both easily accessible
and clearly visible, that is, outside any enclosure or cabinet.
Protective Earth (PE)
Always install a protective earth connection on equipment connected to a
115/230 V AC supply.
For electrical safety reasons all conductive parts, such as the DIN-rail or the
conductive parts to which the rail is fastened, are required to be connected to PE.
The safety aspect that requires such a PE-connection is due to e.g. in-cabinet wiring
providing basic insulation only or accidental touch/connection (e.g. loose wires) of
hazardous voltages to conductive metal parts.
The connection shall fulfill the requirements in IEC61131-2 for PE connections,
that is: A conductor which, having a static current of 30 A flowing through,
measures a voltage drop which corresponds to <0.1 ohm.
ABB strongly recommends that the equipment PE-conductor should be of 35 mm
2
(2 AWG) cross section if copper lead.
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