Generac Power Systems 18 kW NG manual Circuit Condition Initial Dropout of Utility Source Voltage

DC control

Part 4

Section 4.2

Operational analysis

•Should utility voltage drop below approximately 65 percent of the nominal source voltage, a programmable timer on the circuit board will turn on.

•In Figure 2, the 10-second timer is still timing and engine cranking has not yet begun.

•The AUTO-OFF-MANUAL switch is shown in its AUTO position. Battery voltage is available to the circuit board via Wire 13, a 7.5 amp fuse (F1), and Wire 15B.

Figure 2. Circuit Condition - Initial Dropout of Utility Source Voltage

CB

44 240 VAC

11

GENERATOR OUTPUT

33	NEUTRAL
22

CONTROLLER DISPLAY 00

Utility Loss Delay
Pausing 10 sec
								N1											240 VAC
																			UTILITY
																			INPUT
	OPTIONAL
	BATTERY WARMER											N1 N2
			CONTROLLER
	PRINTED CIRCUIT BOARD											N1	N2
85	1																		LED BOARD
86	2	J1														TO	820	1
13	3									7.5 AMP FUSE									L1
															PCB		817	2
18	4																		L2
																	818	3
										SELF RESETTING FUSE							819	4
GOVERNOR		J3
ACTUATOR
									J2
	1	2	3	4	5	6	7	8	9	10	11	12	13 14	15	16	17 18
							4
		0	14		23			15B		0	56
	14														820
			14												817
															818
CS			FS												819
																	0		GROUND
90			0
																	15B		+ BATTERY
								0									23		TRANSFER
																	= 12 VDC ALWAYS PRESENT
		0															= AC VOLTAGE
																	= GROUND FOR CONTROL PURPOSES
LEGEND																	= 12 VDC DURING CRANKING ONLY
BA - BRUSH ASSEMBLY							LOP - LOW OIL PRESSURE SWITCH										= 12 VDC DURING ENGINE RUN CONDITION
CB - CIRCUIT BREAKER, MAIN OUTPUT							SC - STARTER CONTACTOR
CS - CHOKE SOLENOID							SCR - STARTER CONTROL RELAY										= DC FIELD EXCITATION
FS - FUEL SOLENOID							SM - STARTER MOTOR										= 5 VDC TO LED
HTO - HIGH TEMPERATURE SWITCH							SP_ - SPARK PLUG
IM_ - IGNITION MODULE

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