WTC MedWeld 3005, Operator'S Manual

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• Initial C-Factor = 12,450 A. / 65% = 192.
• Final C-Factor = 14,300 A. / 65% = 220.
C-Factor can be used to alert the maintenance staff of a welder’s
deteriorating secondary circuit. You can establish upper and
lower C-Factor limits that correspond to a current threshold, to
meet the needs of the welding process.
The MedWeld 3005 also provides Function #97 (C-FACTOR
LIMIT: HI=000 LO=000) to define the high and low C-Factor
limits for a weld schedule. Use to determine when the welding
conditions indicate the need for maintenance.
When the weld processor detects that the high or low C-Factor
limits were exceeded, it activates the High or Low C-Factor Limit
condition (which can be defined as either a Fault or an Alert in
the setup parameters).
• Low C-Factor is a monitoring condition and usually defined
as an ALERT
• High C-Factor is a welding quality issue, and usually defined
as a FAULT.
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The low C-factor limit detects cable and connection deterioration.
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Suppose a weld schedule requires 14,000 A. at the end of a
stepper program. However, you do not want to exceed 90% of the
tool’s maximum current capacity.
This means that the lowest full-current capacity of the tool should
be 15,555 A. (14000/90=155.555). This makes the low C-Factor
limit 155.
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The high C-factor limit can detect secondary shunting paths.
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A spot weld requires 10,000 A. The maximum current achievable
is 20,000 A. Then the C-Factor is 200.
However, if shunting conditions are simulated and the welds
become substandard at C-Factor of 230, then the High C-Factor
limit can be set to 230.