Kohler APM402 Operation page 25

If the unit is running and Yes is entered when the Enter Calib? is shown, the display will show the following values for three-
phase generator sets. Single-phase generator sets will only display items marked (*).

Volts L1-L2 *

Volts L2-L3

Volts L3-L1

Volts L1-N *

Volts L2-N *

Volts L3-N

Current L1 *

Current L2 *

Current L3
The user can change individual values or can enter Yes when Reset all Calib? is displayed. At the end of the Generator Set
Calibration menu, Exit calibration is shown. Press the pushbutton/rotary selector dial to exit this menu. Refer to the requirements
shown with Generator Set Calibration in the section titled: Status and Notice Digital Displays.
Voltage Regulator Menu
®
Decision-Maker 3000 Controller firmware before 3.0.25:
The voltage regulator value is reviewable at all times. In order to review the value when the generator set is NOT running, enter
Yes when the Enter volt reg? is displayed. The user can review the value but attempting to change the value will cause a Cannot
edit when stopped error message.
If the unit is NOT running and No is entered when the Enter volt reg? is shown, the display returns to the Voltage Regulator main
menu and entry to the Voltage Regulator menu is denied.
If the unit is running and Yes is entered when the Enter volt reg? is shown, the display will show the value.
The user can change the value at this time. At the end of the Voltage Regulator menu, Exit voltage reg is shown- - press the
pushbutton/rotary selector dial to exit this menu.
®
Decision-Maker 3000 Controller firmware 3.0.25 and higher, or APM402 Controller:
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.
To enable calibration, start the generator set and select the VR Volt Adj display. Then push and hold the pushbutton/rotary
selector dial until the Editing Enabled popup appears. Editing of the voltage adjustment is now available.
The user can change the individual value or can select Reset VR?- Yes to reset to the default value. The Reset VR Settings
display will only show if editing is enabled.
To disable calibration, Rotate the pushbutton/rotary selector dial until the <- Return popup appears. Momentarily press the
pushbutton/rotary selector dial. Stop the generator set if not already done.
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