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FIGURE B.1
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CASE FRONT CONTROLS (See Figure B.1)
ITEM | DESCRIPTION |
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1. | Analog Voltmeter |
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2. | Wire Feed Speed Control |
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3. | |
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4. | Work Sense Lead Connector |
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5 | Thermal LED (Motor Overload) |
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6. | Polarity LED |
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7. | Wire Feed Speed Range Switch |
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1. ANALOG VOLTMETER
The analog voltmeter shows the voltage between electrode and work. The voltmeter shows open cir- cuit voltage when the wire feeder is not welding. As a result, it is not unusual to see the needle “pegged” when not welding. The voltmeter is polarity insensi- tive and the range is 0 - 40VDC.
2.WIRE FEED SPEED KNOB
The large, calibrated wire feed speed knob makes for easy and accurate adjustment of the wire feed speed. The knob rotates 3/4 turn. Turn the knob clockwise to increase the wire feed speed, and counter clockwise to reduce the wire feed speed.
Models with analog voltmeters have a calibrated scale printed around the wire feed speed knob using "in/min" units. A separate decal with "m/min" units is included with these models wire feeder. Units with a range switch have two calibrated scales.
Wire Feed Speed, CV Operation
When Across the Arc models are operated with CV power sources, the wire feed speed will remain a con- stant value, independent of arc voltage changes, as long as the arc voltage does not drop below the mini- mum values per the following table.
TABLE B.1 - CV OPERATION | ||
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Minimum | Maximum WFS | Maximum WFS |
Arc Voltage | (Standard) | (Extra Torque) |
15 V | 280”/min. | 210”/min. |
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17V | 340”/min. | 235”/min. |
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21V | 440”/min. | 400”/min. |
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24V | 520”/min. | 400”/min. |
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27V | 600”/min | 400”/min. |
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