The power supply module is a transformer-connected,
i. e. galvanically separated primary and
secondary circuits, flyback type rectifier. The
primary circuit is protected by a 1 A fuse, F1
(slow), in SPGU 240 A1, and a 4 A fuse (fast)
in SPGU 48 B2. The fuses are located on the
circuit board of the module.
When the power supply module is operating,
the green LED indicator Uaux on the system
panel is lit. The supervision of the supply
voltages for the electronics is incorporated into
the regulating modules. A self-supervision alarm
is given if one of the secondary voltages differs
by more than 25% from the rated value. An
alarm signal is also obtained, if the power supply
module is missing, or if the auxiliary voltage
to the regulator has been interrupted.
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