Kohler KG40 Operation page 169

Adjustment and Setting Specifications
Voltage Adjust
The voltage adjust is entered as the rated or otherwise desired line-to-line voltage. The average of the line-to-line voltages is
then regulated to the corresponding value as previously described. The setting may be as fine as tenths of volts. The voltage
adjust defaults to the rated system voltage whenever the system voltage is changed. The voltage adjust may be set to any value
within ±10% of the system voltage. The upper limit is ±10% above the system voltage and the lower limit is ±10% below the
system voltage.
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. This allows the user to monitor any individual
phase, if desired.
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.
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.
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