Kohler APM402, Operation

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TP-6694 9/20 21

Low oil pressure

Megajector communications loss
(GM/PSI and Doosan gas-powered models only)

Metering communication loss

No coolant temperature signal

No oil pressure signal

Overcrank

Overfrequency

Overvoltage (each phase)

Run relay overload

Underfrequency

Undervoltage (each phase)

(Voltage) regulator communication loss
* Requires optional input sensors
1.2.3 Digital Display
Press the pushbutton/rotary selector dial to turn on the controller lamps and display. The lamps and display turn off 60 minutes
after the last entry.
Note:
The APM402 controller takes about 5-10 seconds to power on.
The generator set must be running for some displays to indicate values. If the generator set is not running some values will
display zero or N/A (not available).
Some displays are engine dependent. Refer to the Appendix titled: Controller Displays from the Engine ECM.
The 12-character, 2-line backlit heated display provides generator set and engine data, system status, and fault information.
See the figure titled: Controller with Digital Display and Pushbutton/Rotary Selector Dial. The digital display shows abbreviations
in some instances. Refer to the section titled: Status Event and Fault Specifications for the abbreviations and their full
descriptions.
Note:
US/Metric Unit Display is selectable in Generator Set System.
Note:
Display Contrast is selectable in Generator Set System. The contrast display adjustment allows user selected resolution values
to improve digital display clarity.
Note:
After about 5 minutes of no user input (pushbutton/rotary selector dial or buttons), the menu resets to the top of the main menus
and auto-paging activates for the Overview submenus.
The main menus are listed below. Within each main menu are multiple submenus with descriptions following.

Overview

Engine Metering

Generator Metering

GenSet Information

GenSet Run Time

GenSet System