Kohler 20EKOZD

257Section 14 Load ManagementTP-6953 7/19
Section 14 Load Management
14.1 Purpose
Load Management is intended to disconnect
low-importance loads from the generator system in
order to allow the generator system to continue to
supply important loads. Load Management will permit
low-importance loads to receive power as long as the
generator s ystem has adequate capacity to supply
them, only removing them if the system is operating in a
state of reduced or insufficient power to supply all the
loads.
14.2 Basic Function
Load Management is available in all Decision -Makerr
3500 controllers, but is only active when the controllers
are receiving a remote start signal.
Load Management controls six priority shed outputs.
The priorities add and shed in a fixed order. Priority 6
sheds first and re-adds last. Priority 1 sheds last and
re-adds first. The outputs are controlled with notices in
the controller, but they have to be assigned to digital
outputs or Relay Driver Outputs (RDOs) on the
controller in order to be available to connect t o
low-importance loads.
Note: Load Management uses the load on a single
generator and the frequency of that generator to
determineloadprioritystatus if there is only a
single generator in the paralleling system. Load
Management uses the total generator system
load and the frequency of the paralleling bus to
determine load priority status if there are multiple
generators in the paralleling system (hence all
generators in the system add and shed priorities
simultaneously ( as long as the settings a re
identical).
14.2.1 Sequence of Operation—Singl e
Generator System
1. Startup Shed. When a remote start signal is
applied to the generator, the generator will start and
all the load priorities will shed to ensure that the
generator has enough capacity to handle the inrush
load.
25kW
Critical
loads
Most
important
non-
critical
loads
Least
important
non-
critical
loads
Additional
non-critical
loads
Load
Shed
Panel
Load
Shed
Panel
Generator
(99kW rating)
18kW 8kW 3kW 10kW 12kW 5kW
25kW
Figure 14-1 A Single Generator System Using Load
Management
2. Load Add. After the generator starts and reaches
rated voltage and frequency, Load Management will
become active. If the load on the generator is more
than 15% (the expected load demand per priority)
below the Genset Maximum Percent Capacity,
Load Management will begin timing to add the first
load.
The time required to add the first load is dependent
on the Genset Maximum Perc ent Capacity, the
Base Load Add Time, and the actual real power
output of the generator.
Figure 14-2 Load Add Timing Based on Generator
Output Power
(Genset Max. Percent Capacity = 70%,
Base Load Add Time = 60 seconds)