CHAPTER 3: WELDING SYSTEM SET-UP
MODEL HF2 2 kHz HIGH FREQUENCY RESISTANCE WELDING POWER SUPPLY
3-10
990-057
Weld Head Valve Driver Connections (Figure 3-5)
1
Each air actuated Weld Head has one Solenoid Valve Driver Cable for automatic actuation and
timing control by the HF2 Weld Control. The HF2 Weld Control will automatically recognize
the solenoid voltage of your Weld Head. Connect the 4 pin black plastic connector on the Left
Weld Head Solenoid Valve Driver Cable to the matching Air Valve 1 Driver connector located
on the HF2 Weld Control rear panel.
2
Connect the 4 pin black plastic connector on the Right Weld Head Solenoid Valve Driver
Cable to the matching Air Valve 2 Driver connector located on the HF2 Weld Control rear
panel.
Foot Switch Connection (Figure 3-5)
1
Connect a Model FS1L, 1-Level, or a Model FS2L, 2-Level Foot Switch to the FOOT
SWITCH connector located on the HF2 rear panel. The HF2 will automatically recognize
which model of Unitek Equipment Foot Switch has been connected.
2
1-Level Foot Switch
-- The l-Level Foot Switch must be fully depressed by the operator.
When the Foot Switch closes, the HF2 energizes the Air Actuated Weld Head, causing the
Upper Electrode to descend and apply force to the parts. If the Foot Switch is released before
the Weld Head applies the Preset Firing Force, the HF2 will automatically return the Upper
Electrode to its up position.
3
2-Level Foot Switch
-- When a 2-Level Foot Switch is pressed to the first level, the HF2
energizes the Air Actuated Weld Head, causing the Upper Electrode to descend and apply force
to the parts. If the Foot Switch is released before the operator presses the Foot Switch to the
second level, the HF2 will automatically return the Upper Electrode to its up position so that
the parts can be repositioned. Once the second level has been reached and the Force Firing
Switch in the Weld Head has closed, Weld Current will flow and the HF2 will automatically
return the Upper Electrode to its up position.
