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• After the engine starts and when the generator AC output voltage and frequency have reached a pre-set value, transfer switch circuits signal the transfer switch main contacts to actuate to the “Standby” power source side. Generator AC output then powers load circuits. • When the utility power source voltage is restored above a pre-set level, transfer switch solid state circuits signal the switch main contacts to move back to their utility power source side. • Following re-transfer back to the utility power source side, transfer switch circuit board action opens the circuit. Engine then shuts down. NOTE: If the generator is installed in conjunction with a GTS type transfer switch, refer to the applicable transfer switch manual for exact operating parameters and timing sequences. 12 Generac® Power Systems, Inc. Section 3 - Operation Guardian Liquid-cooled 15 kW, 20 kW and 25 kW Generators 3.2 CONTROL CONSOLE COMPONENTS The components of a liquid-cooled generator control console (Figure 3.1) are as follows: Figure 3.1 - Liquid-Cooled Generator Panel • 3.2.4 15 AMP FUSE The fuse protects the control console’s DC control circuit against electrical overload. If the fuse has melted open because of an overload, engine cranking and startup cannot occur. If replacement of the fuse is necessary, use only an identical 15-amp fuse. (Type AGC, part number 022676). FUSE FAULT HOUR METER 15-A INDICATOR AGC AUTO SET EXERCISE OFF TIME ON MANUAL • 3.2.1 HOURMETER Indicates time the engine-generator has operated, in hours and tenths of hours. Use the hourmeter along with the periodic maintenance schedule for the generator set. • 3.2.2 AUTO/OFF/MANUAL SWITCH Use this three-position switch as follows: • Set the switch to AUTO for fully automatic operation. See “Automatic Operation”, Section 3.4. • Set switch to MANUAL position to crank and start the generator engine. • Set switch to OFF position to shut down an operating engine. With OFF selected, operation will not be possible. DANGER ! With switch set to AUTO, engine can crank and start suddenly without warning. Such automatic start up normally occurs when utility source voltage drops below a pre-set level. To prevent possible injury that might be caused by such sudden starts, set AUTO/OFF/MANUAL switch to OFF before working on or around the unit. Then, place a "DO NOT OPERATE" tag on control console. • 3.2.3 FAULT INDICATOR LAMP The lamp goes ON when one or more of the following engine faults occurs and when engine shuts down. • Low oil pressure • Overcrank • High coolant temperature • Overspeed • Low coolant level • 3.2.5 7.5 AMP INLINE FUSE This inline fuse is connected in the 15A line that runs between the AUTO/OFF/MANUAL switch and position 10 of the 76009A PCB. This fuse protects the start, fuel, field boost, and transfer outputs from the PCB and will open if there is excessive current draw on any one of these outputs. NOTE: This fuse will not remove the positive (+) battery input power from the PCB when it opens. This means the exercise timer will not be reset. If this fuse does open, carefully check the wiring to the start, fuel, field boost and transfer outputs before replacing the fuse. • 3.2.6 SET EXERCISE TIME SWITCH This switch allows for programming the generator to start and exercise automatically. See “Weekly Exercise Cycle” (Section 3.5). 3.3 MANUAL TRANSFER AND START-UP To transfer electrical loads to the STANDBY (GENERATOR) power source side and start the engine manually, refer to the Owner’s Manual of the particular transfer switch. 3.4 AUTOMATIC OPERATION To set the system for fully automatic operation, proceed as follows: • Check that load circuits are connected to the utility power supply. • Set the AUTO/OFF/MANUAL switch to its AUTO position. • Set the generator main circuit breaker to its ON or CLOSED position. 3.5 WEEKLY EXERCISE CYCLE The generator will start and exercise once every seven days. During this weekly exercise, the unit runs for about 20 minutes and shuts down. Transfer of loads to generator output does not occur during the exercise. To select day and time for exercising, proceed as follows: Generac® Power Systems, Inc. 13 Section 4 — Maintenance Guardian Liquid-cooled 15 kW, 20 kW and 25 kW Generators • Set the AUTO/OFF/MANUAL switch to OFF. • Set generator main circuit breaker to OFF or OPEN. • Locate the rocker switch on the control panel identified with the words “Set Exercise Time” (Figure 3.2). • Push “Set Exercise Time” switch to ON position for 20 to 30 seconds and then release. Switch will spring back into its original position when released. • Wait 30 seconds before setting the AUTO/OFF/ MANUAL switch to AUTO position. ! If the AUTO/OFF/MANUAL switch is switched too soon, the engine may start. If engine does start, it will shut down automatically in about two (2) minutes. • Set the generator main circuit breaker to its ON or CLOSED position. • Generator is now programmed to start and exercise every seven days thereafter, on da...