Basler Electric DGC-2020 - Manual (Page 343)

set to Analog or the Bias Control Contact Type is set to Continuous since it is not
applicable in either case.
iv. Correction Pulse Width - This setting defines the maximum width of a contact output
pulse for proportional contact outputs. This is the maximum “On” time allowable for
the proportional outputs. This parameter cannot be programmed if the Bias Control
Output Type is set to Analog or the Bias Control Contact Type is set to Continuous
since it is not applicable in either case.
v. Voltage Controller Gains (Kp, Ki, Kd, Td, Kg) - There are four Proportional - Integral -
Derivative (PID) controllers involved when a DGC-2020 and LSM-2020 are used in a
load sharing or load control system. The gains of the controllers involved with voltage
control are discussed below. Controller gains are configured as part of the controller
tuning procedure. The tuning procedures for all PID controllers are presented in
Appendix C, Tuning PID Settings. Controller tuning is performed after all other
settings have been configured and is the last step in setting up a DGC-2020 and
LSM-2020 for load sharing or load control.
The voltage controller gains are:
(1) Voltage Controller Kp - Proportional Gain
(2) Voltage Controller Ki - Integral Gain
(3) Voltage Controller Kd - Derivative Gain
(4) Voltage Controller Td - Derivative filter time constant
(5) Voltage Controller Kg - Loop Gain, must be nonzero for control to occur
vi. Voltage Trim Deadband - The Voltage Trim error is calculated as the difference
between the measured voltage and the voltage trim set point divided by the machine
Rated Voltage. When this difference is less than the trim dead band setting, the
voltage trim controller will treat this as zero error. If system operation appears
"nervous" when voltage trim is enabled, setting a nonzero dead band may result in
smoother system operation. In addition, if machines do not appear to share kvar
equally when voltage trim is enabled, setting a nonzero dead band will likely result in
improved kvar sharing.
vii. Remote Trim Bias - The remote trim bias setting selects an analog input to use as a
bias to the voltage trim set point.
viii. Remote Trim Bias (%) - The remote trim bias (%) setting specifies the range, in
percent, of the active voltage trim set point over which the voltage trim can be biased.
ix. Trim Voltage - The trim voltage setting defines the voltage trim value in volts.
x. Alternate Voltage 1 through 4 - The Alternate Voltage 1 through Alternate Voltage 4
settings define the voltage trim value when the corresponding Alternate Voltage
Override logic element is true in BESTlogicPlus programmable logic.
xi. Var/PF Control Enable - Select Enable to turn on the kvar / Power Factor controller.
Note that Var/PF control occurs only when the generator is paralleled to the utility as
indicated by the parallel to mains (ParToMains) logic element in BESTlogicPlus
Programmable Logic. When Var/PF control is enabled, the generator breaker is
closed, and the generator is not paralleled to the utility as indicated by the Parallel To
Mains logic element, the DGC-2020 will control the kvar to achieve kvar sharing with
the other generators in the system through intergenset communications. When the
generator breaker is open, the DGC-2020 will control the kvar to achieve voltage
droop for kvar sharing.
xii. Control Mode - Select Var Control or PF Control as the control mode. The controller
will operate in this mode when the generator is paralleled to the utility as indicated by
the parallel to mains (ParToMains) logic element in BESTlogicPlus Programmable
Logic.
xiii. Var/PF Controller Gains (Kp, Ki, Kd, Td, Kg) - There are four Proportional - Integral -
Derivative (PID) controllers involved when a DGC-2020 and LSM-2020 are used in a
load sharing or load control system. The gains of the controllers involved with Var/PF
control are discussed below. Controller gains are configured as part of the controller
tuning procedure. The tuning procedures for all PID controllers are presented in
9400200990 Rev X DGC-2020 Setup 7-55