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.
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