Basler Electric DGC-2020 - Manual (Page 198)

Figure 4-72. Demand Start/Stop
A Demand Start Stop Enable: Enable or Disable.
B Delayed Start Level: Adjustable from 0 to 1 in increments of 0.001.
C Start Level Timeout: Adjustable from 0 to 600 s in 0.1 s increments.
D Delayed Stop Level: Adjustable from 0 to 1 in increments of 0.001.
E Stop Timeout: Adjustable from 0 to 600 s in 0.1 s increments.
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
A 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 B 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
C defines the time to wait after a demand start/stop request before the next unit
responds to a demand start/stop request.
Each LSM-2020 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 will propagate to all connected units that are not
in the disabled mode. All units on the network are notified of this mode change via the system. A unit is
available for sequencing if it is in auto mode and its sequencing mode is other than disabled.
If two or more units have the same sorting order parameter, the sequencing ID D 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 will be 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) will be 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
E .
The BESTCOMSPlus Generator Sequencing screen is illustrated in Figure 4-73.
The available sequencing modes are defined in the following paragraphs.
Disabled
This is the only mode that can coexist with a different mode on a networked system. A unit configured as
disabled does not participate in sequenced starting and stopping and does not respond to demand
start/stop requests.
Staggered Service Time
If this mode is selected, units will seek to sort the start priority of all non-disabled networked units in
ascending order of service hours remaining. In this configuration, a network of units will respond to a
demand start request by starting the unit with the least number of service hours remaining first. If a unit is
down to zero service hours remaining, it is moved to the lowest start priority position. In the event that two
or more units have matching service hours remaining, the unit with the lowest sequencing ID is assigned
4-88 DGC-2020 BESTCOMSPlus
® Software
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