Black & Decker 200 WATT Guide de dépannage télécharger pdf (Page 4)

The modified sine wave produced by the Power Inverter has an RMS (root mean

square) voltage of 115 volts, which is the same as standard household power. Most

AC voltmeters (both digital and analog) are sensitive to the average value of the

waveform rather than the RMS value. They are calibrated for RMS voltage under the

assumption that the waveform measured will be a pure sine wave. These meters will

not read the RMS voltage of a modified sine wave correctly. They will read about 20

to 30 volts low when measuring the output of the inverter. For accurate measurement

of the output voltage of this unit, use a true RMS reading voltmeter such as a Fluke

87, Fluke 8060A, Fluke 77/99 series, Beckman 4410, or Triplett 4200.

Modified Sine Wave and Sine Wave Comparison

OPERATING INSTRUCTIONS

Power Source Requirements

The power source must provide 12.5 volts DC and must be able to supply the

necessary current to operate the load. The power source may be a battery or a well-

regulated DC power supply. To obtain a rough estimate of the current (in amperes)

the power source must deliver, simply divide the power consumption of the load (in

watts AC) by 10.

Example: If a load is rated at 200 watts AC, the power source must be able to deliver:

200 divided by 10 = 20 amperes

CAUTION

The Power Inverter must be connected only to batteries with a nominal

output voltage of 12 volts. The unit will not operate from a 6 volt

battery and will sustain permanent damage if connected to a 24 volt

battery.

Connection to Power Source

The Power Inverter comes equipped with a DC accessory outlet plug and battery clip

cables for connection to a power source (Models 1045BD and 1046 BD only).

Connecting to a Power Source Using the Accessory Outlet Plug

The DC accessory outlet plug is suitable for operating the inverter at power outputs up

to 100 watts. The tip of the plug is POSITIVE (+) and the side contact is NEGATIVE (–).

Connect the inverter to the power source by inserting the DC accessory outlet plug

firmly into the accessory outlet of a vehicle or other DC power source.

CAUTIONS

• Connect directly to power source when operating above 100 watts.

• Do not use with positive ground electrical systems.

• Reverse polarity connection will result in a blown fuse and may

cause permanent damage to the inverter.

HOW THIS INVERTER WORKS

The inverter converts low voltage DC (direct current) from a battery or other power

source to standard 120 volt AC (alternating current) household power.

Principle of Operation

The inverter converts power in two stages. The first stage is a DC-to-DC conversion

process that raises the low voltage DC at the inverter input to 145 volts DC. The

second stage is the actual inverter stage that converts the high voltage DC into 115

volts, 60 Hz AC.

The DC-to-DC converter stage uses modern high frequency power conversion

techniques that have replaced the bulky transformers found in less technologically-

advanced models. The inverter stage uses advanced power MOSFET transistors in a

full bridge configuration. This ensures excellent overload capability and the ability to

operate reactive loads like small induction motors.

The Power Inverter Output Waveform

The AC output waveform of the Power Inverter is known as “modified sine wave.” It

is a waveform that has characteristics similar to the sine wave shape of utility power.

This type of waveform is suitable for most AC loads, including linear and switching

power supplies used in electronic equipment, transformers, and motors.

12VDC to

145VDC

CONVERSION

145VDC to

115VAC

CONVERSION

Internal

Fuses

Two AC

Outlets

12VDC

Input

115VAC, 60Hz

to AC appliances

Figure 4. Rear Panel (All Models)

1. Negative (–) DC

Power Connection

2. High-Speed Cooling Fan

3. Positive (+) DC

Power Connection

1. Power LED

2. Warning LED

3. ON/OFF Switch

4. AC Outlets

Figure 2. VEC1046BD/1047BD Front Panel

VEC1045_46_47_BD_Manual 4/28/05 5:16 PM Page 2

1 2 3 4 5 6

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Black & Decker 200 WATT Guide de dépannage Page 4

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