9440300990 18-3
DECS-250 Terminals and Connectors
Table 18-1. Left Side Terminal and Connector Descriptions
These terminals accept three-phase operating power for the excitation power
stage of the DECS-250. A ground for the operating power connections is
provided at terminal GND.
Excitation power is supplied to the field through the terminals labeled F+ and F–.
The GND terminal serves as the chassis ground for the DECS-250.
These terminals connect to user-supplied current transformers (CTs) providing
three phases of generator sensing current and a cross-current compensation
These terminals accept ac and/or dc control power to enable DECS-250
operation. A ground terminal is also provided.
Three-phase generator and bus sensing voltage, obtained from user-supplied
voltage transformers (VTs), connect to these terminals.
A portion of this terminal block accepts an external analog control signal for
auxiliary control of the regulation setpoint. Terminals I+, I–, V+, and V– are used
for external control of the regulation setpoint with the GND terminal serving as a
cable shield connection.
The remaining terminal block pins serve as connections for the Watchdog and
programmable relay outputs 1 through 4.
Relay contact outputs for programmable relay outputs 4 through 11 connect to
these terminals.
Contact inputs for the Start and Stop functions and programmable contact inputs
1 through 4 are applied to these terminals.
Programmable contact inputs 5 through 10 are applied to these terminals.
A portion of these terminal block pins accept connections for programmable
contact inputs 11 through 14.
The remaining terminal block pins serve as connections for RS-485
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