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OM-303 Page 15
SECTION 6 − OPERATION
6-1. Controls
Ref. ST-155 790-F
1 Weld Process Switch
Use switch to select weld process.
In Stick position (down), weld output goes On
and Off with Power switch.
In GTAW (TIG) position (up), remote control
device turns on and adjusts weld output of unit
as limited by Amperage control. Built-in arc
starter comes on when needed to start or stabi-
lize welding arc. No adjustments needed for
arc starter.
2 Pilot Light
3 Power Switch
Use switch to turn unit, fan, and pilot light On
and Off.
4 Amperage Control
For Stick (SMAW), use control to adjust amper-
age within range selected by the Range/Polar-
ity Switch.
5 Stick (SMAW) Table
Use table to find approximate Stick amperage
output at Amperage control setting.
See Section 6-2 for example of front panel am-
perage control.
For remote amperage control used when TIG
(GTAW) welding, front panel Amperage control
setting is the maximum amperage percentage
available at the remote control device.
See Section 6-3 for example of remote amper-
age control.
6 Range/Polarity Switch
Use switch to select range and polarity of weld
output.
For Direct Current Electrode Negative
(DCEN), use Electrode Negative position.
For Direct Current Electrode Positive (DCEP),
use Electrode Positive position.
For alternating current (AC), use range needed
for welding application − AC Low or AC High
position − see Warning.
See Section 6-4 to find suggested type of weld
output for application.
7 High Temperature Shutdown Light
Lights when unit overheats and shuts down
(see Section 7-2).
8 Output On (Contactor) Light
Lights when output (contactor) and unit power
are on.
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