Kohler 20-3250 kW manual Overfrequency Specs

Over Current VR Shutdown. The lamp illuminates and the unit shuts down when the controller detects an overcurrent fault with voltage restraint. The local display shows sd over current pr. (Paralleling applications only.)

Overfrequency. The lamp illuminates and the unit shuts down when the frequency is above the overfrequency setting. The local display shows overfrequency. See Figure 2-3.

Overfrequency		Overfrequency
Setting Range	Time Delay	Default Setting
102%--140% of nominal	10 sec.	110% of nominal

Figure 2-3 Overfrequency Specs

Overpower. The lamp illuminates and the unit shuts down when the controller detects a fault in the paralleling system. The shutdown is set at 102% for standby and 112% for prime power applications. The local display shows over power. (Paralleling applications only.)

Overspeed. The lamp illuminates and the unit shuts down immediately when the governed frequency on 50 and 60 Hz models exceeds the overspeed setting for

0.25seconds. The local display shows overspeed. See Figure 2-4 for overspeed specs.

Generator		Overspeed	Overspeed Default
Set	Time Delay	Range Hz	Setting Hz
Frequency Hz
60	0.25 sec.	65--70	70
50	0.25 sec.	55--70	70

Figure 2-4 Overspeed Specs

Overvoltage. The lamp illuminates and the unit shuts down when the voltage exceeds the overvoltage setting for the time delay period. The local display shows overvoltage. Overvoltage specifications follow. See Figure 2-5.

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
Overvoltage	Time	Default Setting	Overvoltage
Setting	Delay	without	Default Setting
Range	Range	Paralleling	with Paralleling
105%--135%	2--10 sec.	115% at 2 sec.	135% at 10 sec.
of nominal

Figure 2-5 Overvoltage Specs

Reverse Power. The lamp illuminates and the unit shuts down when the controller detects a reverse power condition. The reverse power relay senses AC power flow into the generator set. If the generator set is being feed power or being ”motored” by another generator set or the utility, the reverse power relay senses this AC power flow and opens the generator set circuit breaker. The local display shows sd reverse power. (Paralleling applications only.)

Underfrequency. The lamp illuminates and the unit shuts down when the frequency falls below the underfrequency setting. The local display shows underfrequency. See Figure 2-6.

		Underfrequency
Underfreq.		Default Setting	Underfrequency
Setting	Time	without	Default Setting
Ranger	Delay	Paralleling	with Paralleling
80%--95%	10 sec.	90% of nominal	80% of nominal
of nominal
Figure 2-6 Underfrequency Specs

Undervoltage. The lamp illuminates and the unit shuts down when the voltage falls below the undervoltage setting for the time delay period. The local display shows undervoltage. Undervoltage specifications follow. See Figure 2-7.

		Undervoltage
Undervoltage		Default Setting	Undervoltage
Setting	Time Delay	w-o/Parallelin	Default Setting
Range	Range	g	w/Paralleling
70%--95% of	5--30 sec.	85% of nominal	70% of nominal
nominal		at 10 sec.	at 30 sec.

Figure 2-7 Undervoltage Specs

40 Section 2 Operation TP-6200 10/12