Voltage Regulation Submenu - Kohler 500EOZCS Operation

1.7.4

Voltage Regulation Submenu

Note: Have setup
Decision-Makerr 3500 controller performed only
by an authorized Kohler distributor/dealer. The
setup and adjustments are password protected.
The Decision-Makerr 3500 controller has a built-in
voltage regulation function. This means that no external
voltage regulator is necessary. The voltage regulation
of the controller uses Root Mean Square (RMS) sensing
for fast response to changes in indicated and regulated
voltages resulting in excellent regulation accuracy.
The descriptions of the voltage regulator adjustments
and features follow.
Avg Gen Voltage L-L. Average generator set voltage
L-L and each line-to-line volts is shown.
Voltage Adjust. The voltage adjust allows the user to
enter the desired generator set output level.
voltage regulator controls the average of the three
output phase voltages to this target in a three phase
configuration, and L1-L2 voltage to this target in a single
phase configuration.
Submenus display the individual line-to-line voltages
and the individual phase voltages. These voltages are
for reference only and are relevant in unbalanced load
conditions. The voltage adjust setpoint can be changed
to accommodate an important phase in an unbalanced
system.
Target Voltage.
Decision-Makerr 3500 controller is trying to achieve
including droop and parallelling bias.
Gen Frequency. Generator set frequency in Hz is
shown.
Volts/Hz. The excitation control system includes an
under- frequency unloading feature. This is sometimes
referred to as Volts- per- Hertz or V/Hz.
frequency drops below a certain value, the output
voltage is reduced to decrease engine load, allowing the
engine speed to recover more quickly. The output
voltage reduction is based on the frequency.
Volts per Hz Settings. The amount of voltage reduction
can be adjusted to achieve the desired transient
response of the engine and alternator system. The V/Hz
function will use the following parameter settings:
V/Hz Setpoint (Hz)
D
V/Hz Slope (%/Hz)
D
V/Hz reduction limit (fixed at 50% of rated voltage)
D
Volts per Hz Adjustment. The V/Hz settings can be
changed using the PC-based setup program or at the
front panel using the password. The setup program will
TP-7126 5/20
and adjustments of
The voltage that
When the
read current settings to determine a similar function
when making changes to alternator connections,
the
system voltages or operating frequency.
Volts/Hz Setpoint. This adjustment affects the voltage
droop (volts per Hz) when load is applied and
underfrequency occurs. The volts/Hz setpoint setting
defines the threshold below which the underfrequency
unloading is active. Any frequency below the setpoint
causes the voltage to drop thus reducing the load
allowing the engine speed to recover according to the
volts/Hz slope setting.
Engine speed recovery depends upon characteristics
such as engine make, fuel type, load types, and
operating conditions. The volts/Hz setpoint setting is set
at the factory to match the engine speed recovery
characteristics for the application.
Volts/Hz Slope. This setting determines how much the
voltage drops during an underfrequency condition. The
The
Volts/Hz Slope setting is set at the factory. Typically,
applying a large electrical load causes a dip in engine
speed and frequency. The voltage regulator reduces
voltage, allowing engine speed recovery.
volts-per-Hz setting determines the degree of unloading
that occurs for each 1 Hz decrease in frequency.
Voltage Droop at 100% kVAR (Reactive Droop).
Reactive droop compensation provides reactive current
flow adjustment in the generator set when connected in
paralleling applications.
excitation levels with increasing reactive power.
reduced excitation level reduces generator set reactive
the
power or generated VARs, improving reactive load
sharing.
Enter the parameter as a percentage of system voltage
when full-rated load with 0.8 power factor is applied.
Any loads less than full load force the voltage to drop by
the ratio of reactive volt-amps (VARs) to rated VARs.
Voltage Gain Adjust. Regulator gain refers to the gain
of the control system. Generally, the higher the gain the
faster the system responds to changes and the lower
the gain, the more stable the system.
If the voltage is slow to recover when loads are applied
or removed, increase the regulator gain. If the voltage is
unstable, decrease the regulator gain.
The voltage regulator value is reviewable at all times
and provides the ability to fine adjust voltage. Changing
the system voltage or replacing the circuit board
typically requires a voltage adjustment.
Start-Up Ramp Rate. Slowly ramps the voltage to its
target to minimize voltage overshoot at startup.
The
Reactive droop reduces
Section 1 Specifications 25
A