Briggs & Stratton 1679-0 Installation Manual download pdf (Page 16)

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Bri_,_s& Stratton Power Products Home Generator System

Installation Manual

AUTOMATIC OPERATION

SEQUENCE

The generator's control panel houses a logic control circuit

board.This control board constantly monitors utility power

source voltage. Should that voltage drop below a preset

level,control board action will signal the engine to crank

and start.After the engine starts, the control board signals

the transfer switch to activate and to connect load circuits

to the backup power supply.

When utility source voltage is restored above a preset

voltage level,the control board signalsthe transfer switch

to transfer loads back to the power supply.After retransfer,

the engine is signaledto shut down.

The actual system operation is not adjustable and is

sequenced by sensors and timers on the control board, as

follows:

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

B-second timer.The timer is used to'sense' brown-outs.

• Once the timer has expired, the engine will crank and

start.

Engine Warm-up Time Delay

This mechanism lets the engine warm up for about

15 seconds before the load is transferred to the Home

Generator System.

Backup Voltage Sensor

This sensor monitors generator AC output voltage.When

the voltage has reached 50 percent of the nominal rated

voltage, transfer to the backup generator can occur.

Utility Voltage Pickup Sensor

This sensor monitors utility power supply voltage.When

that voltageis restored above 70 percent of the nominal

source voltage, a retransfer time delay starts timing.

Retransfer Time Delay

• Thistimer runs for about 6 seconds.

• At the end of a 6-second delay,circuit board action de-

energizes the generator relay in the transfer switch.

• Retransfer to utilitypower source then occurs.

Engine Cool-down Timer

• When the loadistransferred back to the utility power

source, the engine cool-down timer starts timing.

• The timer will run for about one minute, then the

generator will stop.

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Briggs & Stratton 1679-0 Installation Manual Page 16

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