Winco DGC-2020 - Manual (Page 126)

4-56 DGC-2020 BESTCOMSPlus Software 9400200990 Rev K
D Breaker Closing Angle: Adjustable from 3 to 20  in 1  increments. If Phase Lock Loop synchronization
is selected, this specifies the maximum acceptable slip angle under which a breaker close command can
be issued.
E Sync Activation Delay: Adjustable from 0.1 to 0.8 seconds in 0.1s increments.
F Regulation Offset: Adjustable from 2 to 15% of nominal generator voltage in 0.5% increments. This
specifies the voltage acceptance window for the synchronization function.
G Vgen>Vbus: Enable or Disable.
H Sync Fail Activation Delay: Adjustable from 0.1 to 600 in 0.1 s increments. This is the amount of time
the DGC-2020 will allow the synchronizer to attempt to synchronize the generator to the bus before
annunciating a Synch Fail pre-alarm. The pre-alarm can be cleared by switching to OFF mode or pressing
the Reset button on the front panel of the DGC-2020.
BIAS CONTROL SETTINGS
Settings are provided for AVR Bias Control and Governor Bias Control. Refer to Appendix C for
instructions on Tuning Speed PID Settings and Load Control PID Settings.
AVR Bias Control Settings
The bias control output type
A should be set to contact when operating without an optional LSM-2020.
The DGC-2020 adjusts the generator voltage and frequency by issuing voltage correction signals to the
generator AVR (automatic voltage regulator). Correction signals are issued in the form of DGC-2020
output contact closures. These correction signals can be either continuous or proportional
B . Proportional
correction uses control pulses of varying widths C and intervals D . Initially, long pulses are issued when the
voltage and frequency differences are large. As the correction pulses take effect and the voltage and
frequency differences become smaller, the correction pulse widths are proportionally decreased.
Proportional correction pulses are beneficial in applications where fixed correction pulses can result in
overshooting the slip frequency and regulation offset targets.
When an optional LSM-2020 is connected, the bias control output type
A should be set to analog. This
enables a PID controller that controls the voltage bias from the LSM-2020 to the voltage regulator. The
controller adjusts the bias output to drive the error between desired generator voltage and measured
generator voltage to zero. Settings are provided for proportional gain
E , integral gain F , derivative gain G ,
derivative filter constant H , and loop gain I of the PID controller.
Var/PF Control
The Var/PF controller is used to implement Var and Power Factor control of the generator when it is
paralleled to the utility as indicated by the Parallel to Mains logic element in BESTlogic+. If Var/PF control
is enabled, the generator breaker is closed, the generator is stable, and the Parallel to Mains logic
element is TRUE, the Var/PF controller will become active. Whenever these conditions are not TRUE, the
Var/PF controller is disabled, and the machine will operate in voltage droop.
When control
J is enabled and the control mode K is set to Var, the Var setpoint can be derived from either
a user setting or an analog input. The DGC-2020 calculates an operating kVar setpoint based on the kVar
setpoint source setting
L . When this is set to User Setting, the operating kVar setpoint is equal to the
configured kVar setpoint M . When the kVar setpoint source setting L is set to LSM-2020 input or an AEM-
2020 input, the operating kVar setpoint is equal to the value calculated from the analog input. Parameters
are available for kVar analog max
N and kVar analog min O .
When control mode J is set to PF, the PF setpoint can be derived either from a user setting or from an
analog input. The DGC-2020 calculates an operating PF setpoint based on the PF setpoint source
setting
P . When this is set to User Setting, the operating PF setpoint is equal to the configured PF
setpoint Q . When the PF setpoint source setting P is set to LSM-2020 input or an AEM-2020 input, the
operating PF setpoint is equal to the value calculated from the analog input. Parameters are available for
PF analog max
R and PF analog min S .
When an optional LSM-2020 is connected, the bias control output type A should be set to analog. This
enables a PID controller that controls the Var/PF bias from the LSM-2020 to the voltage regulator. The
controller adjusts the bias output to drive the error between desired generator Var/PF and measured
generator Var/PF to zero. Settings are provided for proportional gain
T , integral gain U , derivative gain V ,
derivative filter constant W , and loop gain X of the PID controller.
The percent voltage droop to be used when the unit is in droop mode is determined by the droop
percentage setting
Y . Voltage droop mode is entered any time the generator breaker is open. Voltage