5-6 DECS-100 BESTCOMS Software 9287500991 Rev K
Voltage Matching – Mode.
The voltage matching mode can be Maintain or Revert. When Maintain is
selected, the DECS-100 setpoint is maintained at the bus voltage level even after the generator or utility
breaker opens. When Revert is selected, the DECS-100 setpoint reverts to its original level when the
generator or utility breaker opens.
Figure 5-8. Setting Adjustments Screen, Startup Tab
Control Gain
The Control Gain screen consists of one tab labeled Control Gain. Click the Gain button to access the
Control Gain screen or click Screens on the menu bar and click Control Gain.
Control Gain Tab
Control gain settings are shown in Figure 5-9 and are described in the following paragraphs.
Stability Range.
This setting selects one of 20 preset stability ranges within the DECS-100. A guide for
selecting the stability range is provided in Table 5-1. A setting of 21 enables the entry of custom stability
settings through the BESTCOMS PID window. Information about the PID window is provided later under
the heading of PID Window. When the Stability Range is set at 21, the PID button may be selected to
access the PID window. A Stability Range setting of 1 through 20 disables the PID button and prevents
access to the PID window.
AVR/FCR - Proportional Gain KP.
This setting selects the proportional constant (KP) stability parameter.
The DECS-100 supplies a value that is equivalent to KP multiplied by the error between the voltage
setpoint and the actual generator output voltage. KP values of 0 to 1,000 may be entered in increments of
0.01.
Observe the following guidelines when tuning the KP value. If the transient response has too much
overshoot, then KP should be decreased. If the transient response is too slow, then KP should be
increased.
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