Kohler Industrial Generator Set Operation Manual page 117

As a reference, the present voltage adjust setting is
displayed as well as the average value of the line-to-line
voltages. The individual line-to-line voltages are also
displayed on the subsequent menu screens.
allows the user to monitor any individual phase, if
desired.
The voltage adjust setting may be changed by means
other than the menu including user-defined digital input
or remote communications.
occurs, the new value will be displayed accordingly in
the voltage adjust menu.
Underfrequency Unload Enable
The underfrequency unload enable menu is used to turn
the underfrequency unload on or off. A YES entry will
turn the feature on and the display will show ENABLED
YES. A NO entry will turn the feature off and the display
will show ENABLED NO. The underfrequency unload
defaults to an enabled (ON) condition.
TP-6694 7/18
This
If voltage adjustment
Frequency Setpoint
The frequency setpoint is the cut-in point for
underfrequency unloading. At any operating frequency
below the frequency setpoint, the output voltage will be
reduced. The frequency may be entered with resolution
to tenths of a Hz. The range of acceptable entries is 30
to 70 Hz. The default value is one cycle-per-second (or
two for non-ECM engines) below the normal system
frequency. The frequency setpoint changes to the
default value if the system frequency changes. A setting
of 30 Hz essentially disables the underfrequency unload
feature because most engines do not normally drop to
speeds this low, even during load applications.
Underfrequency Unload Slope
The slope determines how much voltage is reduced
during an unloading condition. The line-to-line voltage
is regulated to a value less than the voltage adjust
setting by this amount for every cycle below the
frequency setpoint. The voltage may be entered with
resolution as fine as one-tenth of one volt. The default
value is 2.0 volts per-cycle-per-second. A zero entry for
the slope in effect turns the underfrequency unload
feature off.
Appendix 117