Bryant ASPAX1BBA015 owner manual Sequence of Automatic Operation, Manual Transfer Operation

Section 3 — Operation

15 kW Generator

‹3.3.2 120 VAC GFCI OUTLET

The generator is equipped with an external 15 amp, 120 volt, GFCI convenience outlet that is located in the right rear of the generator enclosure. When the generator is running, in the absence of utility power, this outlet may be used to power items outside a home such as lights or power tools. This outlet may also be used when utility power is present by run- ning the generator in manual mode. This outlet does not provide power if the generator is not running. This outlet is protected by a 15 amp circuit breaker located in the generator control panel (Figure 3.1).

E.Retransfer Time Delay

•This timer runs for about 15 seconds.

•At end of a 15-second delay, circuit board action de-energizes the 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 tim- ing.

•The timer will run for about one minute, and the generator will then shut down.

3.4SEQUENCE OF AUTOMATIC

OPERATION

The generator’s control panel houses a control logic circuit board. This board constantly monitors util- ity 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 acti- vate 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 70 percent of the nominal supply voltage, the sensor energizes a 15-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 seconds before the load is transferred to a standby source.

C.Standby Voltage Sensor

•This sensor monitors generator AC output volt- age. 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 volt- age. When that voltage is restored to above 70 percent of the nominal source voltage, a retrans- fer time delay starts timing.

3.5MANUAL TRANSFER OPERATION

‹3.5.1 TRANSFER TO GENERATOR POWER SOURCE

To start the generator and activate the transfer switch manually, proceed as follows:

1.Set the generator’s AUTO/OFF/MANUAL switch to OFF.

2.Set the generator’s main circuit breaker to its OFF (or OPEN) position.

3.Turn OFF the utility power supply to the transfer switch using the means provided (such as a utility main line circuit breaker).

DANGER

Do not attempt to activate the transfer switch manually until all power voltage supplies to the switch have been positively turned off. Failure to turn off all power voltage supplies may result in extremely hazardous and possibly fatal elec- trical shock.

4.Use the manual transfer handle inside the trans- fer switch to move the main contacts to their “Standby”position, i.e., loads connected to the standby power source (Figure 3.2).

Figure 3.2 – Manual Transfer Switch Operation

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