9440300990 4-1
DECS-250 Power Stage
4 • Power Stage
The DECS-250 supplies regulated dc excitation power to the field of a brushless exciter. Excitation power
is supplied at terminals F+ and F–.
DECS-250 power stage operating power accepts single- or three-phase ac power from a transformer or
PMG. DC power from the station batteries or the armature of a dc exciter is also acceptable. Power stage
operating power is applied at terminals A, B, and C. The GND terminal serves as a ground connection.
The DECS-250 power stage supplies excitation power by means of a filtered, switching power module
that uses pulse-width modulation. It is capable of supplying 15 Adc continuously at nominal voltages of
32, 63, or 125 Vdc. With nominal operating voltage applied, it has a forcing capability of 30 Adc for 10
seconds.
Nominal DECS-250 operating power levels include 60 Vac for a 32 Vdc continuous exciter field
requirement, 120 Vac or 125 Vdc for a 63 Vdc requirement, or 240 Vac or 250 Vdc for a 125 Vdc
requirement.
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