Kohler 14EKOZD Operation page 33

Protective Relays
The protective relays serve two purposes:
1. To protect the generator from damage
2. To protect the loads supplied by the generator from damage
The protective relays are configured during commissioning and should not be adjusted except by a trained commissioning agent.
These settings are often taken into consideration for breaker trip curves, load control settings, and generator management
settings. The adjustment without careful consideration of the implications may mask a problem in the system and cause another.
Properly-configured protective relays should only trip due to a failure.
Note:
All protective relay events will trip the breaker/contactor, but will not stop the generator until the Trip to Shutdown Delay has
expired. During this time, the protective relay which tripped the breaker/contactor will be listed under the Active Events, the
warning LED will be active, and the generator will remain running. The protective relay can be reset by pressing the AUTO button
(note, if the generator is in Run, the protective relay will have to be cleared by stopping the generator). Pressing OFF/RESET or
removing the remote start signal to the generator system also clears any active protective relays.
Gen Management
Generator Management is intended to minimize wear and tear, fuel consumption, pollutant/sound emissions, and generated
heat. It acts by signaling each generator to stop when it is unneeded. If generator management for a generator is disabled, the
generator will start—generator management failures will result in additional generators running any time the system receives a
start signal (this unit or others).
Generator management sequences the generators off in a predetermined order. The highest order generators stop first (when
load is low enough) and re-start last (when load is too high). The order can be viewed on the front panel of the controller, but
can only be adjusted under certain conditions (see Gen Management Order later in this section).
The time to start a generator (if the load increases) varies with the degree of overload.
The time to stop a generator (if the load is low enough that the generator is no longer needed) varies with the degree of available
capacity.
Note:
Receipt of a start signal will cause all generators to start, synchronize, and close to the bus. Generator management requires
that the generators are available (not faulted) in order to be permitted to stop. If a generator is faulted or manually stopped and
then placed back in Auto, Generator Management will require the generator to start and connect to the bus before it is considered
available (and permitted to stop) again—even if generator management had previously signaled the generator to stop.
Start Capacity. The percent of generator rated kW of the running generators that the system allows before the accumulator to
start this generator begins filling. The Start Capacity is set during commissioning and should not be changed.
Start Delay. The time to decide to start the generator at 10% over capacity. The Start Delay is set during commissioning
and should not be changed.
Stop Capacity. The percent of generator rated kW of the other running generators that the system allows before the accumulator
to stop this generator begins filling. The Stop Capacity is set during commissioning and should not be changed.
Stop Delay. The time to decide to stop the generator at 10% available capacity. The Stop Delay is set during commissioning
and should not be changed.
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