Thermal Arc PRO-WAVE 300 TSW, Service Manual

Page: 42 / 110

PRO-WAVE 300TSW
4-12 August 10, 2005
D. Slope Mode Sequence
Weld Current Down
Slope
Up
Slope
I n itial
Current
Switch
Closed Switch
Open Switch
Closed Switch
Open
Pr ef low
Final
Current
Postflow
Art # A-05533
Figure 4-6: Slope Mode Sequence
NOTE
Slope function operates with a Remote ON/OFF device only.
1) To start Slope sequence Close remote switch contacts. Once the welding arc is established the Power Source will
maintain initial current setting as long as the remote switch contacts areclosed.
a) In the HF TIG mode, after Preflow time High Frequency is present at the torch. When the torch is positioned
close to the work the welding current will transfer to the work and establish the arc at the initial current
setting.
b) In the Lift TIG mode, after preflow time Lift Start current is present at the torch. When the electrode is
touched to the work and lifted off, the welding arc is established at the initial current setting.
2) Open Remote Switch – current increases to weld current. Once welding arc has reached weld current the power
source will maintain weld current as long as the remote switch contacts areopen.
3) Close Remote Switch – Welding current decreases to final current setting. Once final weldingcurrent is reached the
power source will maintain final current setting as long as the remote switch contacts are closed.
4) Open Remote Switch – Welding arc stops and post flow begins.
E. Slope Mode with repeat sequence
The repeat function is operated during the down slope cycle of the Slope Sequence and is active through the down
slope period only. During the down slope period by opening the Remote Switch contacts the current will increase back
to weld current. Within the Down Slope period the repeat function can be operated as many times as desired. To
continue slope cycle and end slope sequence close remote switch contacts and allow weld current to reach final
current setting. Once final current setting is reached opening the Remote Switch again will turn off the welding arc and
post flow begins.