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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 recom-
mendations .for best results.
For straight polarity, attach the electrode cable to the negative terminal,
and attach the work cable to the positive terminal. To change to reverse
polarity, reverse the cables.
I
STRAIGHT POLARITY
I
REVERSE POLARITY
WORK CABLE
ELECTRODE
WELDING DUTY CYCLE
The duty cycle is the percentage of time that the welder can be operated in
a given 10 minute beriod.
For example, at a rated output of 130 amperes, the EW 171’s duty cycle is
50%. This means that at 130 amperes, welding can be performed for a
total of 5 minutes out of every 10 minute period. The duty cycle is longer at
lower operating currents, and shorter at higher currents.
(EW171)
Current
170A
150A 136A IIOA Below 90A
Rate
15% 25% 50% 65% 100%
(EWI 40)
Current
140A 115A IOOA / 85A 1 Below 65A 1
I
Rate
I
15%
I
25%
I
40%
I
65%
I 100% I
CAUTION: Do not operate the welder beyond its duty cycle; doing so will
decrease the performance and service life of the generator/welder.
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