ABB SACO16D1-AA Digital Annunciator Unit

tinuously monitors the hardware and the soft

ware of the unit. The system also supervises

the operation of the auxiliary supply module

and the level of the electronics' voltages gen

erated by the module.

If a permanent fault is detected, the fault indi

cator on the front panel is lit, the output relay

of the self-supervision system operates and

the outputs are blocked.

Auxiliary supply voltage

The auxiliary supply of the relay is obtained

from an internal plug-in type power supply

module. Two auxiliary power module types

are available: type SPGU 240A1 for the sup

ply voltage range 80…265 V ac/dc and type

SPGU 48B2 for the supply voltage range

18…80 V dc. The power supply module

forms the internal voltages required by the

annunciator.