Appendix D. Alternator Protection - Kohler APM402 Operation

The controller has built-in thermal protection for the alternator. This feature functions similarly to a thermal circuit breaker. When
the output current exceeds the nominal rating for a short period of time the condition causes the fault shutdown. The amount of
time at which current is over the rating is inversely related to the amount of current above the nominal rating. In other words, the
higher the current, the shorter the acceptable time.
The current and time limits are defined by actual test data and are maintained in the personality parameter file. Although the
equation for detecting a fault is proprietary, some of the important limits are shown below for informational purposes.
Rated Current Time Delay
200% 40 seconds
300% 10 seconds
425% 5 seconds
950% 1 second
TP-6694 9/20
Appendix D. Alternator Protection
169