Basler Electric DGC-2020HD - Manual (Page 133)

9469300990 Rev B 123
Generator Sequencing
Enabling sequencing on a networked group of load share units allows these units to manage load by
starting and stopping appropriate units based on a factor of load demand and available capacity. The
mode of operation is used to determine the order in which each generator in a group will contribute to the
systems power production upon a demand start/stop request. The maximum start time setting defines the
time to wait after a start request before demand start/stop can request the next priority unit to start. The
maximum stop time defines the time to wait after a demand start/stop request before the next unit
responds to a demand start/stop request.
Caution
For generator sequencing to function properly, the Load Control
Enable setting must first be enabled. This setting is found on the
Governor Bias Control Settings screen in BESTCOMSPlus or through
the Front Panel interface.
By default, units first check to see if a consistent mode is present on the currently networked controllers. If
a consistent mode is found, that mode is adopted. If a consistent mode is not found, the unit enters a
mode mismatch state. If a mode mismatch occurs, verify that all machines on the network are configured
for the same generator sequencing mode.
Each DGC-2020HD maintains its own start/stop status with respect to sequencing. When there is a
change to generator sequencing mode on any one unit, this change propagates to all connected units
that are not in the disabled mode. All units on the network are notified of this mode change. A unit is
available for sequencing if it is in auto mode and its sequencing mode is any other than disabled.
If two or more units have the same sorting order parameter, the sequencing ID will be used to determine
which unit has priority. For example, if the sequencing mode is set for largest size first and both are
100-kW machines, the unit with the lower sequencing ID is given priority. In the event that both units have
the same sequencing ID, the unit with the lower unit ID (based on the Mac address) is given priority.
If a unit fails to sequence on, the next generator in the sequence will be requested. The generator that
previously failed will be requested again in the next sequence cycle.
The last machine can be shut down if there is no load on the system by enabling Allow Last Unit
Shutdown.
The BESTCOMSPlus Generator Sequencing screen is illustrated in Figure 65. Settings are listed in Table
43.
Figure 65. Settings Explorer, Multigen Management, Generator Sequencing
DGC-2020HD Multiple Generator Management