Thermal Arc 281 FABRICATOR, Руководство по обслуживанию

Страница: 40 / 108

FABRICATOR 281
OPERATION 4-4 Manual No. 0-4880B
0
100
200
300
400
500
600
700
800
900
25 50 75 100 125 150 175 200 225 250 275 300 325
Current (Amps)
Wire Speed (IPM
)
(.030 - AL)(.035 - AL)
(.047 - AL)
Art # A-07453
ALUMINUM
Figure 4-5: Aluminum - AMP to IPM Conversion
Thermal Overload
The critical component for thermal protection are the rectifier stack and the transformer, which are fitted
with thermal overload cut out devices. If the overload is activated then the machine should be left to cool for
approximately 15 minutes before resuming welding. If the Power Source is operated within its duty cycle, the
thermal overload will not activate. Refer to section 2.09 for an explanation of duty cycle and section 2.10 for the
power supply specifications.
Wirespeed Control
The Wirespeed Control knob controls the welding current via the electrode wire feed rate, i.e. the speed of the
wire feed motor.
Coarse Voltage Selector Switch
The Coarse Voltage Selector sets the voltage level to the welding terminals as it is rotated in the clockwise
direction.
Fine Voltage Selector Switch
The Fine Voltage Selector switch increases the voltage (in smaller increments than the Coarse switch) as it is
rotated in either direction.
CAUTION
The Coarse & Fine Voltage Selector switches MUST NOT BE SWITCHED during the welding process.