Voltage Selector Switch; Paralleling Operation - Kohler 500EOZCS Operation

1.7.5

Voltage Selector Switch

The voltage selector switch menu does not apply to the
EOZCS/EFOZCS models.
1.7.6

Paralleling Operation

Note: Have paralleling setup performed by appropriately
skilled and suitably
personnel familiar with generator set parallel
commissioning,
troubleshooting.
The Decision-Makerr 3500 controller is a paralleling
controller and provides varying degrees of paralleling
functionality.
While the Decision-Makerr 3500 controller can also be
used with external switchgear controlling the speed,
voltage and paralleling breaker/contactor, the Parallel
Operation menu is used to configure settings for parallel
operation where the controller is communicating on a
network with other controllers and provides integral
paralleling functionality.
Paralleling Setup
The Paralleling Setup menu is intended to configure the
basic settings for the parallel operation of the controller.
Most of the settings in this menu are configured during
commissioning and do not require user adjustment.
There are a few settings that may be viewed or adjusted
after commissioning is complete.
Volts-Hz OK Delay. The time that the voltage and
frequency must remain within the acceptable window
before the controller considers them to be stable. The
voltage window requires the output voltage of the
generator to be within the Voltage OK Pickup of the
system voltage, the frequency window requires the
operating frequency of the generator to be within the
Frequency OK Pickup of the system frequency. This
delay may need to be increased if the first generator to
close to the bus has not yet reached rated operating
parameters or if the speed/voltage is in an overshoot
condition when the generator comes online.
First On Delay. The time that the system will wait before
closing the first generator to the bus. This delay should
be set as low as possible, but can be extended to ensure
that a different generator will be the first to close. One
generator in the system should have the first on delay
set to a low number to minimize the delay before the
generator can supply power to the load.
26 Section 1 Specifications
trained maintenance
operation, service,
kW Ramp Rate. The generator will load and unload
against the other generators at this rate. The default rate
(5%/sec) requires 20 sec to accept 100% load.
Increasing the ramp rate will allow the generator to
disconnect more quickly from the bus when signal to
stop by generator management, but may result in
variations in the output voltage or frequency of the
generator system. The ramp rate can be decreased if
there is noticeable fluctuation in the voltage or
frequency when a generator is loading or unloading.
and
Trims Enable. The trims are the mechanism that the
paralleling system uses to keep the output voltage and
frequency near the rated values when the generator
system is operating. The trims default is enabled on all
generators, but they can be disabled on some
generators in the system to improve load sharing. The
trims should be enabled on at least one generator in the
paralleling system or the voltage and frequency may
drift significantly during the operation of the system.
Load Enable. The generator will unload and trip the
circuit breaker/contactor when this setting is set to OFF.
This can be used to force a generator to soft-unload and
shut down for service. To keep the breaker/contactor
from reclosing, the Sync Mode in Auto can be set to OFF
(see Sync Mode In Auto below). A generator is not
considered for generator management when Load
Enable is set to OFF. This parameter should always be
returned to ON after the generator has been stopped for
service, as it will keep the generator from sharing load or
starting for generator management if it is set to OFF.
Stand Alone Mode. This will tell the controller that it is a
paralleling controller, even if it does not see another
generator on the communication lines. This may be
required if all other generator controllers are removed
from service for a period of time in which the battery
power to this controller will be cycled (the controller
remembers that it is in a paralleling system until power is
cycled). If the controller sees another controller on the
PGEN communication network, this parameter will not
change the operation of the system in any way. The
Stand Alone Mode is set to OFF in order for the
controller to see PGEN communication to control the
motor operator breaker.
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