Kohler EKOZD Series Service page 245

13.2.3 Timing Approach
The Generator Management in the Decision-Makerr
3500 controller uses Overload-Based Start Timing and
Capacity-Based Stop Timing. This means that the time
to start or stop a generator depends on the loading on
the system.
Start Timing
The Start Timing is inversely related to the system
load—increasing system load will decrease the time to
start a generator. This
Management system to start additional generators
when needed while providing ride-through capability for
transient loads.
The Start Delay and Start Percentage are adjustable,
but the curve shape
Decision-Makerr 3500 controller.
Figure 13-11 Overload-Based Start Timing
Start Percentage = 80%,
Start Delay = 10s
Figure 13-11 illustrates that the system load would have
to remain at 85% of running capacity for about
40 seconds before an additional generator would start,
but the generator will start within 2.5 seconds if the
system load reaches 100% of running capacity. The
curve shape is intended to approximate the capability of
the generators.
TP-6953 7/19
allows the Generator
is hard-coded for the
Stop Timing
The Stop Timing is directly related to the system
load—increasing system load will increase the time to
stop a generator. This
Management system to stop unneeded generators
while maintaining enough capacity online to support
transient loading.
The Stop Percentage and the Stop Delay are
adjustable, but the shape of the curve is hard-coded in
the Decision-Makerr 3500 controller.
Figure 13-12 Capacity-Based Stop Timing
Stop Percentage = 60%,
Stop Delay = 300s
Figure 13-12 illustrates that Generator Management
would require only 9 seconds to stop a generator if the
generator system were completely unloaded, but that
the generator would take 1200 seconds (20 minutes) to
stop a generator if the load on the other generators
would be 55% after that generator stopped. This
technique helps to ensure that the system can handle
the load without a particular generator before stopping
that generator.
Section 13 Generator Management Information
allows the Generator
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