OPERATION |
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CONTROLS AND SETTINGS
Operator controls are illustrated in Figure B.1. Refer to the figure and the following explanations of the controls.
WIRE FEED SPEED CONTROL. This control sets the feed speed of the wire feeder. Turn the knob to the left for slower speeds and to the right for higher speeds. The control is calibrated. The nameplate shows the wire speed for the given setting of the control.
BURNBACK CONTROL (OPTIONAL). This control, located on the optional K419 Burnback Timer and K418 GMA Timer Kits, provides a precise time delay that allows the wire to be burned off at the end of the weld. This is useful for those applications where higher speed, fine wire feeding is used and there is a tendency for the electrode to overrun at the end of the weld and cause “sticking” in the crater. The delay is adjustable for optimum burnback depending on wire size, process, procedure, etc.
PREFLOW CONTROL (OPTIONAL). This control, located on the optional K418 GMA Timer Kit, provides flow of shielding gas to the work before the arc is established. The gas solenoid valve is energized
immediately when the gun trigger is closed, but the time delay before the wire feeder is energized is adjustable from 0 to 1.5 seconds. Turn the knob to the left for shorter delays and to the right for longer delays.
POSTFLOW CONTROL (OPTIONAL). This control, located on the optional K418 GMA Timer Kit, provides flow of shielding gas to the work after welding has stopped. Delay for the gas solenoid valve shutoff is adjustable from 0 to 1.5 seconds. Turn the knob to the left for shorter delays and to the right for longer delays.
PURGE - COLD INCH SWITCH (OPTIONAL). This control, located on the optional K418 GMA Timer Kit, provides control of some wire feeder functions without energizing the welding power source. The momentary up position energizes the gas solenoid but not the wire feeder or welding power source. The momentary down position energizes the wire feeder but not the gas solenoid or the welding power source.
ELECTRODE POLARITY SWITCH (OPTIONAL). This switch, located on the optional K416 Digital and K417 Analog Meter Kits, controls the polarity of the meter. Set this switch to the same polarity as the electrode lead to allow correct operation of the meter.
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FIGURE B.1 – WIRE FEEDER CONTROLS.
PREFLOW POSTFLOW CONTROL CONTROL (OPTIONAL) (OPTIONAL)
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BURNBACK CONTROL (OPTIONAL)
WIRE FEED SPEED CONTROL
ELECTRODE POLARITY SWITCH (OPTIONAL)
