Kohler 14RESA Installation And Operation Instruction Manual - Page 19
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If any voltage dip is observed (typically by dimming
lights) when a generator closes the paralleling contactor
after synchronizing, it may be necessary to determine if
the fuel systems of the generators are allowing them to
maintain a stable speed. (The speed must be changing
at the moment that the contactor closes).
If the throttle of one of the generators is closed or the
generator fuel supply is exhausted, the generator will
start to absorb power. This means that the alternator is
acting as a motor and is spinning the generator. When
this occurs the other generator will have to supply power
to the load and supply power to the generator that is
"motoring". The controller will sense this condition and
open the paralleling contactor for the generator that is
absorbing power after 20 seconds.
5.2 Primary and Secondary Controllers
The generator set controllers are designated as primary
and secondary.
The RBUS primary controller is responsible for initiating
all communication over RBUS.
The primary controller operates all of the RBUS
D
modules.
The primary controller reads status from all RBUS
D
modules.
If the primary controller loses power, RBUS
D
communication for the paralleling system is lost.
The RBUS secondary controller responds to requests
from the primary controller.
The secondary controller monitors activity on the
D
RBUS but is not able to control any RBUS devices.
The
secondary
controller
D
management information from the primary controller.
The secondary controller can only change the state of
D
the contactor for the secondary generator if the
primary controller sends a request to close.
Note: The
primary
designations will change if AUTO- OFF is
pressed on the primary controller.
Section 5.3.2.
TT-1596
8/22
receives
generator
and
secondary
controller
5.3 Generator Management
The
paralleling
management as described below.
If one generator does not start, the other generator
D
remains online and supplies as many loads as it can
support. The load management device sheds the
loads that exceed the capacity of the generator set.
After both generators are connected to the load, one
D
generator will disconnect from the bus and shut down
if not needed for 5 minutes. If a load control module or
load shed kit is connected, the generator will stop
5 minutes after all of the loads are added.
minimum time before a generator will stop is
5 minutes without a load management device and
11 minutes with a load management device.
The
generator
D
generator set operation when possible to equalize the
generator set run times.
Operating order is changed during operation if the
D
generator set run time hours differ by more than 24
hours.
Generator management logic is solved in the primary
D
controller. Generator management configuration is
verified in the secondary controller when it connects.
A message will warn the user of a difference in
configuration.
The
primary
D
configuration in each of the attached devices.
Changing a generator management parameter
setting at the primary controller will change the setting
on both generator set controllers.
5.3.1 Generator Management Operation
If a single generator is overloaded, the load control
module (if equipped) will shed load until the other
generator has come online.
Generator Management requires the following to be true
before it will consider stopping a generator:
An ATS start signal is present, a loaded exercise is
D
See
active, or an unloaded full-speed exercise is active.
Both generators are online.
D
All load control priorities have been added (generator
D
management does not wait for all loads to be added if
no Load Control Module exists on the RBUS
network).
The system has been stable (no changes in the
D
above conditions) for 5 minutes.
system
performs
management
logic
controller
can
overwrite
generator
The
alternates
the
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