Kohler EKOZD Series Service page 246

13.3 Generator Management
Considerations
Generator Management is disabled by default on the
Decision-Makerr 3500 controller. It is important to
consider the following before enabling Generator
Management:
Application of the Generator System.
D
applications where the generators run for extended
durations and for extended time intervals, Generator
Management will provide a significant improvement
in the life and fuel efficiency of the generators.
Standby applications that run only occasionally are
less dependent on Generator Management.
Load Types. In applications where the load varies
D
quickly and significantly, it is more difficult to manage
the generators, as a large increase in load may
overload the generator system before Generator
Management can start another generator. Although
Generator Management can be used in these
applications, the system needs to be configured to
keep enough generators online to support the
transient load.
Generator Sizing. If the generators are sized such
D
that any of them can support the entirety of the load,
Generator Management provides the function of
stopping unneeded generators while permitting them
to be available in case of a failure.
Criticality of the Application.
D
applications typically require one or more generators
in spinning reserve. Although, it is possible to
configure Generator Management to keep an
additional generator running, this might not meet the
needs of the application.
Complexity of Operation. Many facilities prefer
D
simple, understandable
generators running when the utility is not available)
which allows for easier troubleshooting (if a generator
is not running, something is wrong).
246 Section 13 Generator Management Information
In
Highly critical
system operation (all
13.4 Generator Management Setup
Generator Management requires consideration of
several factors as each parameter is configured. The
default settings will only work in certain scenarios.
13.4.1 Control Mode
The Control Mode Parameter controls the Order
Selection Method for Generator Management. The
available Methods are:
Manual/Fixed: The Generator Start/Stop Order is
D
manually selected. In this mode, the user sets the
order of each generator at the controller and
Generator Management retains the order (there is no
automatic re-sort during operation).
Note: All generators must have different orders. If two
or more generators have the same order,
Generator Management is disabled (all available
generators will run, but no fault will be displayed
on the controller). The system will attempt to
resolve order conflicts, but this may require
manual intervention, especially if more than one
order is changed
SiteTecht). If generators are added to or
subtracted from the paralleling system, the
system may see an order conflict – resulting in a
reassignment of the orders in the system (the
order for any generator could change from the
previous setting).
Manual mode can be used in a scenario where
certain generators are preferred to run more
frequently for any reason (such as position, sound
level, fuel efficiency, fuel type, etc.).
The need for manual mode should decrease as
additional automatic modes are added.
Runtime: The Generator Start/Stop Order is selected
D
automatically by the controller based on the runtime
hours on each generator. In this mode, the generator
with the lowest runtime hours will be assigned the
lowest order (starting first, stopping last), with each
sequential order number being assigned to generators
of increasing runtime hours. The intent is to equalize
runtime hours between the units.
If the generator system is supplying the load,
Generator Management implements a Runtime
Threshold to avoid starting and stopping generators
every 0.1 hours. The Runtime Threshold is added to
the runtime hours of generators that are not running
(for the purpose of comparison), preventing
excessively frequent starting and stopping of
generators.
simultaneously (using
TP-6953 7/19