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Unitek HF2/230 User Manual
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Contents
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CHAPTER 6: ADVANCED WELD FUNCTIONSMODEL HF2 2 kHz HIGH FREQUENCY RESISTANCE WELDING POWER SUPPLY990-057 6-3WELD/REPEAT (Figure 6-4)Weld/Repeat provides a repeat capability forsimple automated Air Actuated Weld Headapplications using an operator. This weldfunction is ideal for volume production, whichrequires a single schedule.Weld/Repeat can only be used with an AirActuated Weld Head. For Force Fired AirActuated Weld Heads, weld current begins whenboth levels of a two-level Foot Switch are closedand the Force Firing Switch in the Air ActuatedWeld Head closes. Figure 6-4. Weld/RepeatWhen Weld/Repeat is used with a Non-Force Fired Air Actuated Weld Head, the Squeeze (SQZ) Periodmust be used to allow sufficient time for the electrodes to close and apply the required weld force to theparts before the Weld Period begins. Weld current begins when the Squeeze Period ends and both levelsof a two-level Foot Switch are closed.When Weld/Repeat is used with any type of Air Actuated Weld Head, the Hold Period can be used toautomatically keep the electrodes closed on the parts after weld current has terminated for the purpose ofproviding additional heat sinking or parts cooling. Squeeze and Hold Periods have no meaning withManually Actuated Weld Heads and do not appear on either the weld schedule Program or Run screens.Off Period, which is applicable only to Weld/Repeat, sets the cycling rate between spot welds bycontrolling how long the electrodes remain open to allow the parts to be repositioned before the entireweld process repeats.Weld/Repeat Weld Graph Run Screen(Figure 6-5)Weld schedule 002 is pre-programmed at thefactory for Weld/Repeat operation and will onlyfunction using an Air Actuated Weld Head. |
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