Generac Power Systems 9 kW NG, 10 kW LP, 13 kW NG Circuit Condition Engine Startup and Running

DC control

Part 4

Section 4.2

Operational analysis

•The “engine warm-up timer” will run for about 5 seconds. When this timer finishes timing, board action will initiate transfer to the STANDBY power source. As shown in Figure 4 (below), the timer is still running and transfer has not yet occurred.

•Generator AC output is available to transfer switch Terminal Lugs E1/E2 and to the normally open contacts of a transfer relay. However, the transfer relay is de-energized and its contacts are open.

Figure 4. Circuit Condition - Engine Startup and Running

CB

CONTROLLER DISPLAY

Running - Utility Lost

44

11

33

22

00

240VAC GENERATOR OUTPUT

NEUTRAL

	N1	240 VAC
		UTILITY
		INPUT
OPTIONAL
BATTERY WARMER	N1	N2

			CONTROLLER
	PRINTED CIRCUIT BOARD											N1	N2
85	1
86	2	J1														TO
13	3									7.5 AMP FUSE
															PCB
18	4
GOVERNOR		J3								SELF RESETTING FUSE
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
90			0
								0
		0
LEGEND
BA - BRUSH ASSEMBLY							LOP - LOW OIL PRESSURE SWITCH
CB - CIRCUIT BREAKER, MAIN OUTPUT							SC - STARTER CONTACTOR
CS - CHOKE SOLENOID							SCR - STARTER CONTROL RELAY
FS - FUEL SOLENOID							SM - STARTER MOTOR
HTO - HIGH TEMPERATURE SWITCH							SP_ - SPARK PLUG
IM_ - IGNITION MODULE

		LED BOARD
820	1	L1
817	2
		L2
818	3
819	4

0 GROUND

15B + BATTERY

23 TRANSFER

=12 VDC ALWAYS PRESENT

=AC VOLTAGE

=GROUND FOR CONTROL PURPOSES

=12 VDC DURING CRANKING ONLY

=12 VDC DURING ENGINE RUN CONDITION

=DC FIELD EXCITATION

=5 VDC TO LED

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