Kohler APM402 Operation page 51

Overcrank. The fault lamp illuminates red, the alarm horn sounds, and cranking stops when the unit does not start within the
defined cranking period. The local display shows Over Crank Shutdwn. See the section titled: Auto Starting, and the section
titled: Status Event and Fault Specifications for cyclic crank specifications.
Note:
The controller is equipped with an automatic restart function. When speed drops below 25 Hz (750 rpm) while the engine is
running, the unit attempts to recrank. The unit then follows the cyclic cranking cycle and, when the engine fails to start, will shut
down on an overcrank fault condition.
Overfrequency. The fault lamp illuminates red, the alarm horn sounds, and the unit shuts down when the frequency is above
the overfrequency setting. The local display shows Freq High Shutdwn. See Figure 13.
Overfrequency Setting Range
102%- 140% of nominal
Figure 13 Overfrequency Specs
Overvoltage (Each Phase). The fault lamp illuminates red, the alarm horn sounds, and the unit shuts down when the voltage
exceeds the overvoltage setting for the preset time delay period. The local display shows Volts (L1- L2, L2- L3, or L3- L1) High
Shutdwn. See Figure 142 for overvoltage specifications.
Note:
Overvoltage can damage sensitive equipment in less than one second. Install separate overvoltage protection on online
equipment requiring faster than 2-second shutdown.
Overvoltage Setting Range
105%- 135% of nominal
Figure 14 Overvoltage Specs
Run Relay Overload. The fault lamp illuminates red, the alarm horn sounds, and the unit shuts down when the controller smart
switch that operates generator set wire number 70 (Run) is overloaded. The local display shows Run Relay Overload.
Underfrequency. The fault lamp illuminates red, the alarm horn sounds, and the unit shuts down when the frequency drops
below the underfrequency setting. The local display shows Frequency Low Shutdwn. See Figure 15 for underfrequency
specifications.
Underfreq. Setting Range
80%- 95% of nominal
Figure 15 Underfrequency Specs
Note:
The long-term shutdown occurs if the frequency is 1 Hz or more below the system frequency for 60 sec. The long-term shutdown
is not adjustable.
Undervoltage. The fault lamp illuminates red, the alarm horn sounds, and the unit shuts down when the voltage drops below
the undervoltage setting for the time delay period. The local display shows Volts (L1- L2, L2- L3, or L3- L1) Low Shutdwn. See
Figure 16 for undervoltage specifications
Undervoltage Setting Range
70%- 95% of nominal
Figure 16 Undervoltage Specs
(Voltage) Regulator Communications Loss. The fault lamp illuminates red, the alarm horn sounds, and the unit shuts down
when the voltage regulator to controller communication link is disrupted. The local display shows RegCommLos Shutdwn.
TP-6694 9/20
Time Delay Overfrequency Default Setting
10 sec.
Time Delay Overvoltage Default Setting
2- 10 sec.
Time Delay Underfrequency Default Setting
10 sec. (short term)
Time Delay Range Undervoltage Default Setting
5- 30 sec.
110% of nominal
120% at 2 sec.
90% of nominal
80% of nominal at 10 sec.
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