OM-278 Page 13
3-2. Duty Cycle And Overheating
Duty Cycle is percentage of 10 min-
utes that unit can weld at rated load
without overheating.
If unit overheats, thermostat(s)
opens, output stops, and cooling
fan runs. Wait fifteen minutes for
unit to cool. Reduce amperage or
duty cycle before welding.
YExceeding duty cycle can
damage unit and void
warranty.
100% Duty Cycle
Overheating 0
15

A/V

OR
Reduce Duty Cycle
Minutes duty1 4/95 / Ref. SA-168 918
Continuous Welding
3-3. Volt-Ampere Curves
Volt-ampere curves show mini-
mum and maximum voltage and
amperage output capabilities of
unit. Curves of other settings fall be-
tween curves shown.

A. CC Mode B. CV Mode

va_curve1 – 4/95 – ST-168 916 / ST-168 917