North-star 5500 Bedienungsanleitung PDF herunterladen (Seite 7)

multiplying nameplate voltage by nameplate

amperage.

VOLTS X AMPS = WATTS

Example: 120V X 5A = 600W

When connecting a resistive load such as

incandescent lights, heaters or common electric power

tools, a capacity of up to the generator full rated

wattage output can be used.

When connecting a resistive-inductive load such

as a fluorescent or mercury light, transformers or

inductive coils, a capacity of up to 0.6 times the

generator’s full rated output can be used.

Always allow the generator to reach operating

speed before a load is applied.

STARTING ELECTRIC MOTORS

Electric motors require much more current (amps)

to start than to run. Some motors, particularly low cost

split-phase motors, are very hard to start and require 5

to 7 times more current to start than to run. Capacitor

motors are easier to start and usually require 2 to 4

times as much current to start than to run. Repulsion

Induction motors are the easiest to start and require

1.5 to 2.5 times as much to start than to run.

Most fractional motors take about the same

amount of current to run them whether they are of

Repulsion-Induction (RI), Capacitor (Cap), or Split-

Phase (SP) type. The following chart shows the

approximate current required to start and run various

types and sizes of 120 volt 60 cycle electric motors

under various conditions.

120V, 60 Hz Motors

Starting Amps

Hp motor Running

Watts

RI type Cap type SP type

1/6 525 7-11 9-18 16-22

1/4 700 9-15 12-23 22-32

1/3 875 11-18 14-29 26-35

1/2 1175 15-25 20-40 NA

1 1925 24-40 32-64 NA

1 1/2 2400 30-50 40-80 NA

2 2900 36-60 48-96 NA

3 4075 51-85 68-136 NA

5 6750 84-140 112-224 NA

The figures given above are for an average load

such as a blower or fan. If the electric motor is

connected to a hard starting load such as an air

compressor, it will require more starting current. If it is

connected to a light load or no load such as a power

saw, it will require less starting current. The exact

requirement will also vary with the brand or design of

the motor.

Generators respond to severe overloading

differently than the power line. When overloaded, the

engine is not able to supply enough power to bring the

electric motor up to operating speed. The generator

responds to the high initial starting current, but the

engine speed drops sharply. The overload may stall

the engine. If allowed to operate at very low speeds,

the electric motor starting winding will burn out in a

short time. The generator head winding might also be

damaged.

Running the generator under these conditions may

result in damage to the generator stator as well as the

motor windings. Because the heavy surge of current

is required for only an instant, the generator will not be

damaged if it can bring the motor up to speed in a few

seconds. If difficulties in starting a motor are

experienced, turn off all other electrical loads and if

possible reduce the load on the electric motor.

EXTENSION CORDS

When electric power is to be provided to various

loads at some distance from the generator, extension

cords can be used. These cords should be sized to

allow for distance in length and amperage so that the

voltage drop between the set and point of use is held

to a minimum.

Current/Power Maximum Extension Cord Length

Amps

240V

Load

(watts)

#10

Ga.

Cord

#12

Ga.

Cord

#14

Ga.

Cord

#16

Ga.

Cord

10 2400 250’ 150’ 100’ 75’

20 4800 125’ 75’ 50’ 25’

30 7200 60’ 35’ 25’ 10’

40 9600 30’ 15’ 10’ *

50 12000 15’ * * *

*Not recommended

CAUTION: Equipment damage can result from the

low voltage caused by using an extension cord with a

sm a ll wi re si ze .

Use this chart to estimate the total load on your

generator.

For Determining Generator Load Requirements

Device Running Watts

Air Conditioner (12,000 Btu) 1700 (b)

Battery Charger (20 Amp) 500

Belt Sander (3”) 1000

Chain Saw 1200

Circular Saw (6-1/2”) 900

Coffee Maker 1000

Compressor (1 HP) 2000 (b)

Compressor (3/4 HP) 1800 (b)

Compressor (1/2 HP) 1400 (b)

Curling Iron 700

Dishwasher 1200

Edge Trimmer 500

Electric Nail Gun 1200

Electric Range (one element) 1500

Electric Skillet 1250

Furnace Fan (1/3 HP) 1200 (b)

Freezer 800 (c)

Hair Dryer 1200

Hand Drill (1”) 1100

Hand Drill (1/2”) 875

Hand Drill (3/8”) 500

Hand Drill (1/4”) 250

1 2 3 4 5 6 7 8 9 10

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