WTC MedWeld 3005, Operator'S Manual

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This chapter describes some of the advanced features of the
MedWeld 3005 control.
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C-Factor is the value of current obtained for each change in
percentage of the maximum secondary current delivered. C-
Factor equals 1% of the total available current during a weld.
The C-Factor can be used in various ways:
• It can be used as a conversion factor between %I values and
the actual value of current that would be produced.
• A change in C-Factor will indicate changes in the welding
environment.
The actual C-Factor is calculated by the MedWeld 3005 after
every weld, and is displayed by the programming device in the
Weld Data displays.
The processor calculates C-Factor is by dividing the average
secondary current during the weld by the %I fired. The
following formula shows this:
where n = transformer turns ratio.
The C-Factor varies with changing conditions in the secondary.
Decreasing C-Factor indicates that the total capacity of the system
is decreasing. This is evident when the tool current pathways
become more resistive. This, in turn, results in deterioration in
the secondary circuit. (Two examples of this are cable wear and
deterioration of connections.)
C-Factor = I x x = x
pri
n
%I
I
%I
sec
V
nominal
V
line
V
nominal
V
line