WTC MedWeld 4000, Руководство оператора

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Advanced Software Features
MedWeld 4000 Operator’s Guide Modified: 9/17/08 7 - 3
M-032116 Programs #T03300, #T02300 and #T02400
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 4000 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.
Low C-Factor Limit
The low C-factor limit detects cable and connection deterioration.
Determining a Low Limit:
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.
High C-Factor Limit
The high C-factor limit can detect secondary shunting paths.
Determining a High Limit
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.