Senci SC-200A, User Manual, Page: 80 / 90

Welding Duty Cycle
The duty cycle is the percentage of time that the welder can be operated in a given 10 minute period.
For example, at a rated output of 140 amperes, the 190's duty cycle is 40%. This means that at 140 amperes, welding can be performed for a total
of 5minutes out of every 10 minute period. The duty cycle is longer at lower operating currents, and shorter at higher currents.
High Altitude Operation
At high altitude, the standard carburetor air-fuel mixture will be too rich. Performance will decrease, and fuel consumption will increase. A very rich
mixture will also foul the spark plug and cause hard starting. Operation at an altitude that differs from that at which this engine was certified, for
extended periods of time, may increase emissions. High altitude performance can be improved by specific modifications to the carburetor. If you
always operate your generator/welder at altitudes above 5,000 feet (1,500 meters), have an authorized our servicing dealer perform this carburetor
modification. This engine, when operated at high altitude with the carburetor modifications for high altitude use, will meet each emission standard
throughout its useful life.
Even with carburetor modification, engine horsepower will decrease about3.5% for each 1000-foot (300-meter) increase in altitude.
The effect of altitude on horsepower will be greater than this if no carburetor modification is made.
NOTICE: When the carburetor has been modified for high altitude operation, the air fuel mixture will be too lean for low altitude use.
Operation at altitude below 5000 feet (1,500 meters) with a modified carburetor may cause the engine to overheat and result in serious engine
damage. For use at low altitudes, have an authorized service shop for modification.
Do not operate the welder beyond its duty cycle; doing so will decrease the performance and service life of the generator/welder.
Polarity Selection
The welding terminals are labeled "+" (positive) and "-" (negative). Changing the polarity of the cables will affect the weld. The correct polarity
selection is dependent on the type of electrode you are using and the type of material you are welding; refer to the electrode manufacturer's
recommendations for best results.
For straight polarity, attach the electrode cable to the negative terminal, and attach the ground cable to the positive terminal. To reverse polarity,
reverse the cables.
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