Kohler 23EKOZD

203Section 12 Paralleling System InformationTP-6953 7/19
Section 12 Paralleling System Information
12.1 Controller Functionality
The Decision-Makerr 3500 cont roller is intended for
single-generator applications, applications where the
generator speed and voltage is controlled by external
gear to parallel the generators (External Paralleling),
and applications where the controller performs the
synchronization, load sharing, and generator
management (Internal Paralleling).
12.1.1 Single-Generator Operation
No configuration is necessary for the Decision-Makerr
3500 controller to support single-generator operation,
the personality profile that is loaded at the factory will
support this mode.
The Decision-Makerr 3500 controller sets the engine
speed to the target speed, which is determined by the
engine run speed from the personality profile and the
engine speed adjustment (which will adjust the speed
down 50 rpm and up 49 rpm).
On a non-ECM engine, the Decision-Makerr 3500
controller does not control the target speed, it is set at
the governor (unless the engine is fitted with an
electronic governor).
The output voltage of the generator is controlled to the
voltage regulator t arget voltage (which can be adjusted
on the user interface).
12.1.2 External Paralleling
External paralleling requires the external speed and
voltage bias inputs to be enabled ( External Bias Inputs
Enabled under Synchronizatio n Control in SiteTecht).
The speed and voltage bias inputs are configured to
revert to nominal speed and voltage when the signal
goes out of range. The Speed Bias and Voltage Bias
inputs are pulled down to - 3.3V when inactive, providing
wire breakage detection. In the case of wire breakage,
the signal will go out of range and the controller will
revert to nominal s peed or voltage.
With the external bias enabled, the engine speed is set
based on the voltage between SBP and SBN:
D Voltage < 0.5V: Engine Run Speed (Out of Range
condition).
D Voltage = 0.5V: 95% of Engine Run Speed.
D Voltage = 2.5V: Engine Run Speed.
D Voltage = 4.5V: 105% of Engine Run Speed.
D Voltage > 4.5V: Engine Run Speed (Out of Range
condition).
With the external bias enabled, the output voltage is set
based on the voltage between VBP and VBN:
D Voltage < 0.5V: Voltage Regulator Average Voltage
Adjustment (Out of Range condition).
D Voltage = 0.5V: 90% of Voltage Regulator Average
Voltage Adjustment.
D Voltage = 2.5V: Voltage Regulator Average Voltage
Adjustment.
D Voltage = 4.5V: 110% of Voltage Regulator Average
Voltage Adjustment.
D Voltage > 4.5V: Voltage Regulator Average Voltage
Adjustment (Out of Range condition).
The Decision -Maker r 3500 controller reads the voltage
on the speed and voltage bias inputs every 50 ms
(20 times per second) and passes the new target to the
voltage regulator and the ECM.
Reactive droop should be enabled on the
Decision-Makerr 3500 controller when paralleling with
another generator set (either in external or internal
paralleling). The slope should be identical on all
generators in the paralleling system (the default is
1.0%). Reactive Droop is configured under Reactive
Power Load Sharing in SiteTecht and in the Generator
Info -> Voltage Regulation Menu and the Generator Info
-> Paralleling Operation -> Sharing Setup Menu on the
controller user interface.
Note: Non-ECM engines will require a n electronic
governor and an appropriate Kohler governor
calibration in order to permit speed adjustment.