8-2 9440300990
Auxiliary Control DECS-250
=
(
0.004
)
×
20.0
10.0
Equation 8-1. Input Current to Voltage Signal Conversion
Where: V
aux
is the calculated voltage signal and I
aux
is the applied current in amperes.
For setpoint control, V
aux
is multiplied by the appropriate regulation mode auxiliary gain setting.
If the auxiliary input is unused, all auxiliary control gains should be set to zero.
AVR Mode
In AVR mode, the auxiliary control signal is multiplied by the AVR gain setting. The result defines the
setpoint change as a percentage of the rated generator voltage.
=
× 0.01 × ×
For example, applying +10 Vdc with an AVR gain of 1.0 raises the AVR setpoint 10% of rated generator
voltage. This example also applies to the following modes.
FCR Mode
In FCR mode, the auxiliary control signal is multiplied by the FCR gain setting. The resulting value relates
to a percentage of the rated field current.
=
× 0.01 × ×
FVR Mode
In FVR mode, the auxiliary control signal is multiplied by the FVR gain setting. The resulting value relates
to a percentage of the rated field voltage.
=
× 0.01 × ×
Var Mode
In var mode, the auxiliary control signal is multiplied by the Var gain setting. The resulting value relates to
a percentage of the rated apparent power (kVA).
=
× 0.01 × × 1.7321 × × ( )
Power Factor Mode
In Power Factor mode, the auxiliary control signal is multiplied by the PF gain setting to define the PF
setpoint change.
=
× 0.01 × ( )
Summing Type
The auxiliary control signal can be configured to control the inner or outer regulation control loop.
Selecting the inner loop limits auxiliary control to AVR, FCR, and FVR modes. Selecting the outer loop
limits auxiliary control to PF and Var modes.
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