CHAPTER 3: WELDING SYSTEM SET-UP
MODEL HF2 2 kHz HIGH FREQUENCY RESISTANCE WELDING POWER SUPPLY
3-8
990-057
UNITEK EQUIPMENT FORCE FIRED,
DUAL AIR ACTUATED WELD HEAD SYSTEM
General Information
Dual Air Actuated Weld Head System operation uses sequential action to activate one Weld Head and
then a second weld head using a single HF2 Weld Control and HF2 Weld Transformer. The operator
must close and release the Foot Switch to initiate each sequential weld. Sequential Weld Head
activation ensures that only one weld current path exists at a single point in time. To use multiple Weld
Heads simultaneously, refer to
Chapter 3, Non-Force Fired, Multiple Air Actuated Weld Head System.
HF2 Weld Control, Jumper Modifications (Figure 3-3)
Warning:
Before
modifying jumpers, disconnect the 3-phase input power to the HF2 to prevent
serious injury.
1
Remove the HF2 Weld Control cover.
2
The HF2 Weld Control PCB is located
on the right-hand side of the HF2 Weld
Control. Locate Jumpers E10 and E11
by looking in the lower right-hand
corner of the HF2 Weld Control PCB.
3
Using a needle nose pliers, move
Jumpers E10 and E11 from the RELAY
position to the HEAD2 position.
4
Replace the HF2 Weld Control cover.
5
Connect 3 phase input power to the
HF2.
Figure 3-3. HF2 Jumper Modifications
Weld Head Set-up (Figure 3-4)
1
Connect the Upper Weld Cable from each Weld Head to the Positive Terminal on the HF2
Weld Transformer.
2
Connect the Lower Weld Cable from each Weld Head to the Negative Terminal on the HF2
Weld transformer.
3
Adjust each Weld Head Force Adjust Knob to produce 5 units of force as displayed on the
Force Indicator. For a complete description of force control and its effect on the welding
process, please refer to your Weld Head manual.
4
Install electrodes in each Weld Head Electrode Holder.
5
Parallel two sets of twisted wire cables to the clip end of the standard Voltage Sensing Cable
that is connected to the Weld Transformer front panel. Connect one twisted wire cable to the
Left Weld Head electrodes and the other twisted wire cable to the Right Weld Head electrodes.
