Carrier ASPASICCA012 Owner's Manual

Contents

OPERATION Section 2 -- OperationCarrier Air-cooled 7 kW, 12 kW and 15 kW Generators2.3 AUTOMATIC TRANSFEROPERATIONTo select automatic operation, do the following:1. Make sure the transfer switch main contacts are setto their UTILITY position, i.e., loads connected to theutility power source (Figure 2.2).2. Be sure that normal UTILITY power source voltage isavailable to transfer switch terminal lugs N1 and N2.3. Set the generator's AUTO/OFF/MANUAL switch toAUTO.4. Set the generator's main circuit breaker to its ON (orclosed) position.With the preceding steps complete, the generator willstart automatically when utility source voltage dropsbelow a preset level. After the unit starts, loads aretransferred to the standby power source. Refer to Section2.4, "Sequence of Automatic Operation."2.3.1 12 VDCACCESSORY OUTLETYour generator is equipped with a 12 VDC accessoryoutlet in the Generator Control Panel. (Figure 2.1) Withthe generator running or in standby mode, this outlet maybe used to temporarily power low power accessoriessuch as a work light, cell phone, radio or any otherautomotive style accessory. This outlet is capable ofdelivering a MAXIMUM of 7.5 Amps. If the accessory tobe used through this circuit demands too much power,the fuse that protects this circuit will melt open and thecircuit will not be functional.WARNINGThis 12 VDC outlet draws power from thegenerator's starting battery and extended useof this outlet may drain the battery and theengine may not start. This outlet should NOTbe used for battery charging.2.3.2 120 VAC GFCI OUTLETYour generator is equipped with an external, 15 amp, 120volt, GFCl convenience outlet that is located in the rightrear of the generator enclosure. (Figures 1.1 and 1.2,page 5) When the generator is running, in the absence ofutility power, this outlet may be used to power itemsoutside your home such as lights or power tools. Thisoutlet may also be used when utility power is present byrunning the generator in manual mode. This oultlet doesnot provide power if the generator is not running. Thisoutlet is protected by a 15-amp circuit breaker located inthe generator control panel. (Figure 3.1).2.4 SEQUENCE OF AUTOMATICOPERATIONThe generator's control panel houses a control logiccircuit board. This board constantly monitors utility powersource voltage. Should that voltage drop below a presetlevel, circuit board action will signal the engine to crankand start. After the engine starts, the circuit board signalsthe transfer switch to activate and connect load circuits tothe standby power supply (load terminal lugs T1/T2connect to terminal lugs El/E2).Upon restoration of utility power supply, generator circuitboard action signals the transfer switch to transfer loadsback to the utility power supply. After retransfer, theengine is signalled to shut down.The actual sequence of operation is controlled bysensors and timers on a control logic circuit board, asfollows:A. Utility Voltage Dropout Sensor• This sensor monitors utility source voltage.• If utility source voltage drops below about 70 percentof the nominal supply voltage, the sensor energizesa 15-second timer.• Once the timer has expired, the engine will crank andstart.B. Engine Warm-up Time Delay• This mechanism lets the engine warm up for about10 seconds before the load is transferred to thestandby source.C. Standby Voltage Sensor• This sensor monitors generator AC output voltage.When the voltage has reached 50 percent of thenominal 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 70 percent ofthe nominal source voltage, a retransfer time delaystarts timing.E. Retransfer Time Delay• This timer runs for about 15 seconds.• At end of a 15-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 powersource, the engine cool-down timer starts timing.• The timer will run for about one minute, and thegenerator will then shut down.10 Carrier