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The trickle charge feature cannot be used to recharge a discharged battery. 1.18 THE FUSE The generator panel’s 15-amp fuse protects the DC control circuit against overload. The fuse is wired in series with the battery output lead to the panel. If the fuse element has melted open, you cannot crank or start the engine. You should replace the fuse using only an identical 15-amp replacement. 1.19 POST INSTALLATION INSPECTION Before placing the home standby electrical system into service, inspect the entire installation carefully. Some areas may require that an inspection be performed by a building or electrical inspector. Section 1 — Installation Guardian Air-cooled Generators Figure 1.15 – Typical Emergency Power System 18 Generac® Power Systems, Inc. NOTE: Throughout the “Operation” section, differences in procedures specific to sound attenuated units will be denoted as follows: (SA = information). 2.1 USING THE AUTO/OFF/MANUAL SWITCH (FIGURE 2.1/2.2) 2.1.1 “AUTO” POSITION Selecting this switch position activates fully automatic system operation. It also allows you to start and exercise the engine every seven days with the setting of the exercise timer (see Section 3.10, Page 26). This position also is used for remote starting, when it is set up. 2.1.2 “OFF” POSITION This switch position shuts down the engine. This position also prevents automatic operation. 2.1.3 “MANUAL” POSITION Set the switch to MANUAL to crank and start the engine. Transfer to standby power will not occur unless there is a utility failure. With the switch set to AUTO, the engine may crank and start at any time without warning. Such automatic starting normally occurs when utility power source voltage drops below a preset level or during the normal exercise cycle. To prevent possible injury that might be caused by such sudden starts, always set the switch to OFF and remove the fuse before working on or around the generator or transfer switch. Then, place a “Do Not Operate” tag on the generator panel and on the transfer switch. Figure 2.1 – Generator Control Panel (6 kW, 8 kW, 10 kW Non-SA) Figure 2.2 – Generator Control Panel (Sound Attenuated) 2.2 AUTOMATIC TRANSFER OPERATION To select automatic operation, do the following: 1. Make sure the transfer switch main contacts are set to their “Utility” position, i.e., loads connected to the utility power source (Figure 2.3, Page 19). 2. Be sure that normal utility power source voltage is available to transfer switch terminal lugs N1 and N2. 3. Set the generator’s Auto/Off/Manual switch to AUTO. 4. Set the generator’s main circuit breaker to its ON (or closed) position. With the preceding steps complete, the generator will start automatically when utility source voltage drops below a preset level. After the unit starts, loads are transferred to the standby power source. Refer to “Sequence of Automatic Operation.” Section 2 — Operation Guardian Air-cooled Generators Section 2 — Operation Guardian Air-cooled Generators 2.3 SEQUENCE OF AUTOMATIC OPERATION The generator’s control panel houses a control logic circuit board. This board constantly monitors utility power source voltage. Should that voltage drop below a preset level, circuit board action will signal the engine to crank and start. After the engine starts, the circuit board signals the transfer switch to activate and connect load circuits to the standby power supply (load terminal lugs T1/T2 connect to terminal lugs E1/E2). Upon restoration of utility source voltage above a preset level, generator circuit board action signals the transfer switch to transfer loads back to that power supply. After retransfer, the engine is signalled to shut down. The actual sequence of operation is controlled by sensors and timers on a control logic circuit board, as follows: A.Utility Voltage Dropout Sensor • This sensor monitors utility source voltage. • If utility source voltage drops below about 60 percent of the nominal supply voltage, the sensor energizes a 15-second (SA = six-second) timer. • Once the timer has expired, the engine will crank and start. B.Engine Warm-up Time Delay • This mechanism lets the engine warm up for about 10 (SA = 15) seconds before the load is transferred to a standby source. C.Standby Voltage Sensor • This sensor monitors generator AC output voltage. When the voltage has reached 50 percent of the nominal rated voltage, transfer to standby can occur. D.Utility Voltage Pickup Sensor • This sensor monitors utility power supply voltage. When that voltage is restored above 80 percent of the nominal source voltage, a retransfer time delay starts timing. E.Retransfer Time Delay • This timer runs for about 15 (SA = six) seconds. • At end of a 15-second (SA = six-second) delay, circuit board action de-energizes transfer relay in the transfer switch. • Retransfer to utility power source then occurs. F. Engine Cool-down Timer • When the load is transferred back to utility power source, the engine cool-down timer starts timing. • T...

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