Kohler EKOZD Series Service page 263

14.4 Setup
Load Management requires consideration of several
factors as each parameter is configured. The default
settings will work in most scenarios, but many
applications will require additional configuration.
14.4.1 Genset Maximum Percent Capacity
The Genset Maximum Percent Capacity is the threshold
above which the Load Management logic will not
intentionally load the generator. Each load priority is
expected to add 15% load to the generator system, so
load priorities will not add if the load on the system is more
than 15% below the Genset Maximum Percent Capacity.
Range: 0.0% – 120.0%
Default: 70.0%
14.4.2 Generator Overloaded Percent
The Generator Overloaded Percent is the threshold
above which Load Management considers the
generator system to be overloaded. When the generator
output is above the generator overloaded percent, Load
Management will start filling the accumulator to shed the
highest added priority.
Range: 0.0% – 120.0%
Default: 85.0%
14.4.3 Under Frequency Shed Level
The amount of frequency dip from the nominal
frequency below which the underfrequency shed starts
timing. This level should be configured to avoid
underfrequency shutdown or protective relay trips due
to underfrequency. Because the controller has an
extended underfrequency shutdown (1 minute at 1 Hz
below rated speed) it is not recommended to adjust the
underfrequency shed level below 59 Hz (as the
generator will shut down before shedding load).
Range: 0.00 Hz – 5.00 Hz
Default: 0.50 Hz
TP-6953 7/19
14.4.4 Base Load Add Time
The Base Load Add Time defines the time to add a load if
the generator has 25% available capacity. Available
capacity is the difference between the power output
level of the generator and 15% below the Genset
Maximum Percent Capacity level. The timing of the load
add curve is adjusted by changing the Base Load Add
Time. The entire curve is shifted by a factor related to the
new Base Load Add Time. A priority will take
1500 seconds to add with 50% load and a 70% Genset
Maximum Percent Capacity with the default Base Load
Add Time of 60 seconds, but will only take 250 seconds
with a Base Load Add Time of 10 seconds.
Range: 10.0 sec – 2400.0 sec
Default: 60.0 sec
14.4.5 Base Over Load Shed Time
The Base Over Load Shed Time defines the time to shed
a load if the generator has a 10% overload condition.
The overload condition is the difference between the
measured power output percentage of the generator
and the Generator Overloaded Percent. The timing of
the over load shed curve is adjusted by changing the
Base Over Load Shed Time. The entire curve is shifted
by a factor related to the new Base Over Load Shed
Time. A priority will take 120 seconds to shed with
90% load and a 85% Generator Overloaded Percent
with the default Base Over Load Shed Time of
30 seconds, but will only take 12 seconds with a Base
Over Load Shed Time of 3 seconds.
Range: Range: 2.0 sec – 30.0 sec
Default: 30.0 sec
14.4.6 Base Under Frequency Shed Time
The Base Under Frequency Shed Time defines the time
to shed a load if the generator has a 1 Hz underfrequency
condition. The underfrequency condition is the difference
between the measured frequency of the generator and
the Under Frequency Shed Level less than the nominal
(rated) frequency. The timing of the under frequency
shed curve is adjusted by changing the Base Under
Frequency Shed Time. The entire curve is shifted by a
factor related to the new Base Under Frequency Shed
Time. A priority will take 20 seconds to shed with the
frequency drooped to 59 Hz with a 0.50 Hz Under
Frequency Shed Level, a nominal frequency of 60 Hz
with the default Base Under Frequency Shed Time of 5
seconds, but will only take 4 seconds with a Base Under
Frequency Shed Time of 1 second.
Range: 1.0 sec – 20.0 sec
Default: 5.0 sec
Section 14 Load Management 263