Thermal Arc 400 GTSW AC/DC, Operating Manual

Page: 33 / 52

15 OPERATION
3.1 OPERATOR CONTROLS (continued)
Arc Control
Arc Control Knob
Main Knob = Arc Control Knob
Main Knob
5-400A
19V 10V/100A Droop
0 25% 50% 75% 100%
145A
A-00328
Figure 3-B Arc Control Characteristics
The POSTFLOW TIME, PREFLOW TIME, and HOT START
controls are located behind the hinged access door on the front
panel.
The POSTFLOW TIME control allows the operator to select the
length of time gas flows after the arc is extinguished. Postflow
time begins when the arc is broken and the contactor opens.
When postflow time ends, the gas valve closes, shutting off
shielding gas flow to the torch.
The POSTFLOW TIME can be adjusted from 1-50 seconds.
Rotating the control clockwise increases postflow time.
The POSTFLOW TIME control and gas valve only work if the
Process Selector switch is in one of the Gas Tungsten Arc Weld-
ing positions, the OUTPUT CONTACTOR switch is in the RE-
MOTE position, and a remote control is connected to the RE-
MOTE 14 receptacle.
The PREFLOW TIME control only works if the PROCESS SELEC-
TOR switch is in the LIFT TIG or HF TIG position, the OUTPUT
CONTACTOR switch is in the REMOTE position and a remote
control is connected to the REMOTE 14 receptacle.
The PREFLOW TIME can be adjusted from 0.5 to 15 seconds. The
welding arc and high frequency will not become established until
the PREFLOW TIME control completes timing. Rotating the
control clockwise increases the PREFLOW TIME.
NOTE
POSTFLOW TIME
Control(13)
NOTE
PREFLOW TIME
CONTROL(11)
POST FLOW
t 1
PRE FLOW
t 2