CHAPTER 4: CONTROLS
2 KHZ INVERTER WEDLING POWER SUPPLY
990-057
4-5
FOOT SWITCH Connector
Power Supply
FOOT SWITCH
connector uses a 4-pin Amphenol 91-PC4F (AWTA Part # 550-006)
bulkhead connector that mates with an Amphenol 91-MC4M (AWTA Part # 520-009).
Single-Level Foot Switch (Figure 4-3)
1
A Single-Level Foot Switch must be fully
depressed by the operator. When the Foot
Switch closes, the Power Supply 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 Power Supply will
automatically return the Upper Electrode to
its up position.
2
Connect a AMADA WELD TECH - FS1L
Foot Switch, reed relay, or the open collector
of an opto-coupler to the Foot Switch
connector to initiate the welding process.
Figure 4-3. Single-Level Foot Switch
The emitter of the opto-coupler must be connected to Pin 4.
3
When using a non-AMADA WELD TECH Foot Switch, connect Pin 2 to Pin 3.
Two-Level Foot Switch (Figure 4-4)
1
When a Two -Level Foot Switch is pressed to
the first level, the Power Supply 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 Power Supply will
automatically return the Upper Electrode to
its up position so that the parts can be re-
positioned. Once the second level has been
reached and the Force Firing Switch in the
Weld Head has closed, Weld Current will
flow and the Power Supply will automatically
return the Upper Electrode to its up position.
Figure 4-4. Two-Level Foot Switch
2
Connect an AMADA WELD TECH - FS2L Foot Switch, reed relay, or the open collector of an
opto-coupler to the Foot Switch connector to initiate the welding process. The emitter of the
opto-coupler must be connected to Pin 4.
