SGC SG-2000 Uživatelský manuál stáhnout pdf (Strana 2)

MAY 2010 2 Volume 39, No 5

Some experienced electricians are relatively casual

about touching 110 V circuits, but all respect 230 V.

(This constitutes a "don't-try-this-at-home thing, though

--it's quite possible to get a fatal shock or start a fire

with 110 V!) Current trends are toward the use of even

lower voltages (24V, 12V, 5V, 3.3V...) for any devices

which do not draw much total power to increase safety.

Power is rarely distributed at these lower voltages;

rather it is converted from 110 V or 230 V by a trans-

former at the earliest opportunity. Even in North Amer-

ica, 220-240V is commonly used in residential appli-

ances for most high-power electrical appliances (ovens,

furnaces, dryers, large motors, etc.) so that the supply

current and supply wire size can be smaller. Higher

power industrial applications often use 480 V or more.

And, of course, transmission lines use progressively

higher voltages as the distance and total power go up

(22,000 V for local distribution to 1,000,000 V for long

distance lines).

How does 220w work from the fuse box?

For 220 volts you have two 110 hot lines and a neutral

coming to your box. A 110 breaker only uses one line

of this to send power to whatever you have connected

to it and then the power is returned on your neutral

wire. A 220 breaker uses one of each of the two lines

to send 220 volts to whatever you have connected to it

the neutral does not complete the circuit as it does in a

110 volt circuit. In a breaker box each slot that a

breaker can connect to the power is alternately picked

up from one line and then the other line. Slot 1 would

use line 1…slot 2 would use line 2...slot 3 uses line

1...slot 4 uses line 2 etc etc. A 110 volt breaker only

uses one slot and a 220 volt breaker uses two slots..

What is the difference between a voltage converter

and a voltage regulator?

A voltage regulator functions as a voltage converter as

well as a voltage stabilizer.

A voltage stabilizer will stabilize the electricity to a

fixed current. This unit is usually used in countries

where the voltage currency is not stable.

The voltage regulator will stabilize a voltage fluctua-

tion between 75v-130v to 110v (+- 4%).

The voltage regulator will stabilize a voltage fluctua-

tion between 180v-260v to 220v (+- 4%).

I have a product that has a UK, Australian or Indian

plug on it can I connect it to the VC models?

Yes, you can connect it directly to the VC series trans-

formers since they come with a UNIVERSAL outlet

which can accept any 220 Volt/50Hz (overseas) plug

type except for the South African plug.

Do voltage converters convert the cycle (Hz)?

All voltage converters only convert the voltage and

not the cycle, however most appliances and electronics

will function properly with them.

North America 110-120 volt electricity is generated at

60 Hz. (Cycles) Alternating Current. Most foreign 220

-240 volt electricity is generated at 50Hz. (Cycles) Al-

ternating Current. This difference in cycles may cause

the motor in your 60Hz North American appliance to

operate slightly slower when used on 50Hz foreign

electricity. This cycle difference will also cause analog

clocks and timing circuits that use Alternating Current

as a timing base to keep incorrect time. Most modern

electronic equipment including battery chargers, com-

puters, printers, stereos, tape and CD players, VCR/

DVD players, etc. will not be affected by the differ-

ence in cycles.

What is the Difference between Servo and Relay

type voltage regulators?

The Servo type voltage regulator

stabilizes the voltage by adjusting

the transformer to the desired output

voltage. This ensures the highest

precision in voltage stabilization.

The relay type is all done electronically, therefore less

precision.

With the exception of

passive shunt regula-

tors, all modern elec-

tronic voltage regula-

tors operate by com-

paring the actual out-

put voltage to some

internal fixed reference voltage. Any difference is am-

plified and used to control the regulation element in

such a way as to reduce the voltage error.

SERVO TYPE

RELAY TYPE

1 2 3 4 5 6 7 ... 11 12

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