Carrier 12KW Owner's Manual download pdf (Page 17)

Generac

Power Systems, Inc. 15

3.2.3 “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 pre-

set 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 fuses 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.

3.3 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 connect-

ed to the utility power source (Figure 3.2).

2. Be sure that normal UTILITY power source volt-

age 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

Section 3.4, “Sequence of Automatic Operation.”

3.3.1 12 VDC ACCESSORY OUTLET

Your generator is equipped with a 12 VDC accessory

outlet in the Generator Control Panel. (Figure 3.1)

With the generator running or in standby mode, this

outlet may be used to temporarily power low power

accessories such as a work light, cell phone, radio or

any other automotive style accessory. This outlet is

capable of delivering a MAXIMUM of 7.5 Amps. If the

accessory to be used through this circuit demands

too much power, the fuse that protects this circuit

will melt open and the circuit will not be functional.

This 12 VDC outlet draws power from the

generator's starting battery and extended use

of this outlet may drain the battery and the

engine may not start. This outlet should NOT

be used for battery charging.

3.3.2 120 VAC GFCI OUTLET

Your generator is equipped with an external, 15 amp,

120 volt, GFCI convenience outlet that is located in

the right rear of the generator enclosure. (Figures 1.1

and 1.2, page 5) When the generator is running, in

the absence of utility power, this outlet may be used

to power items outside your home such as lights or

power tools. This outlet may also be used when utili-

ty power is present by running the generator in man-

ual mode. This oultlet does not provide power if the

generator is not running. This outlet is protected by a

15-amp circuit breaker located in the generator con-

trol panel. (Figure 3.1).

3.4 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 sup-

ply (load terminal lugs T1/T2 connect to terminal

lugs E1/E2).

Upon restoration of utility source voltage above a pre-

set 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 per-

cent 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 the 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 above 70 per-

cent of the nominal source voltage, a retransfer

time delay starts timing.



Section 3 — Operation

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Carrier 12KW Owner's Manual Page 17

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