Basler Electric DGC-2020 - Manual (Page 191)

I Vgen>Vbus: Enable or Disable.
J Sync Fail Activation Delay: Adjustable from 0.1 to 600 s 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 Sync 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.
K Sync Speed Gain: Adjustable from 0.001 to 1000 in increments of 0.001.
L Sync Voltage Gain: Adjustable from 0.001 to 1000 in increments of 0.001.
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 voltage trim setting and a PID controller.
To achieve Ethernet var sharing among machines in an islanded system, the following conditions must be
met:
•
Var/PF control must be enabled on the AVR Bias Control Settings screen
•
A connection between the DGC-2020 and LSM-2020 must be established
•
LSM-2020s must be connected to each other via Ethernet on the inter-genset communications
network
Section 9, LSM-2020 (Load Share Module) provides setup information and connection diagrams for load
sharing.
Voltage Trim
The voltage trim settings for Rev 1 & 2 hardware differ from those of Rev 3 hardware. Hardware version 3
units support paralleling of reconfigurable machines.
Revision 1 and 2 Hardware
The voltage trim enable setting E maintains system voltage at the setpoint while the system is in islanded
var sharing mode.
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 dead band setting
F ,
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. The Voltage Trim Dead Band is in units of Percent.
Revision 3 Hardware
The voltage trim enable setting E maintains system voltage at the setpoint while the system is in islanded
var sharing mode. When Enable When Gen Breaker Closed is selected, voltage trim is enabled when the
generator breaker is closed, but disabled when the generator breaker is open. This is the default value.
When Enable Always is selected, voltage trim is always enabled.
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
F , 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
9400200990 Rev X DGC-2020 BESTCOMSPlus
® Software
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