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OM-222 Page 23
4-2. Controls (CE Models)
1 Polarity Selector Switch (Optional On 50
Hz Models)
To change polarity on models not equipped
with a Polarity Selector switch, reverse work
and electrode cables at the weld output termi-
nals (see Section 3-8).
Y Turn Off Power before reversing
cables.
2 Arc Force (Dig) Control
Control increases SMAW short-circuit amper-
age which allows the operator to use a very
short arc length without sticking the electrode.
Set control at 0 for normal welding amperage.
Turn clockwise to increase short-circuit
amperage.
3 Hot Start Switch
Turn switch On for SMAW and Off for GTAW
welding.
4 Amperage Adjustment Control
5 Digital Meters (Optional)
6 Power Switch With Indicator Light
7 High Temperature Shutdown Light
8 Remote Amperage Control Switch
For front panel control, place switch in Panel
position. For remote control, place switch in
Remote position, and connect remote device
(see Section 3-10).
9 Output Switch (Contactor)
For front panel control of output, place switch
in Panel position. For remote control of output,
place switch in Remote position, and connect
remote device (see Section 3-10).
Y Turn Off power before connecting re-
mote device.
Ref. ST-173 450-B
300 Amp Model Shown
1
2
89
4
67
3 5
SECTION 5 – MAINTENANCE AND TROUBLESHOOTING
5-1. Routine Maintenance
Y Disconnect power before maintaining.
3 Months
Replace
unreadable
labels.
Repair or
replace
cracked
weld cable.
Clean and
tighten weld
terminals.
6 Months
Blow out or
vacuum inside.
During heavy
service, clean monthly.
OR