WTC MedWeld 3005, Operator'S Manual

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With SPC (Statistical Process Control) Indexing, the control
collects weld data in temporary storage bins. This data can be
collected either in controlled intervals or continuously (in special
situations such as tear-down).
Analyzing the collected weld data can help recognize certain
welding trends such as changes in resistance of the work piece,
primary current and line voltage. You can then use the WTC
XWSS (Weld Support System) to retrieve and analyze the stored
data.
To perform SPC indexing, use the following functions in a weld
schedule, along with the SPC setup parameters described below.
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87 SET SPC OFFSET TO nn
For the purpose of data collection, each weld is assigned a
data storage bin number (00 – 99). This function establishes
the starting bin number for SPC indexing. Here is an
example:
Car Type #1:
Weld Schedule #20 - (SET SPC OFFSET TO 01)
Weld Schedule #01 - 15 Welds Made (Bins 1–15)
Weld Schedule #02 - 15 Welds Made (Bins 16–30)
Weld Schedule #03 - 18 Welds Made (Bins 31–48)
Car Type #2:
Weld Schedule #21 - (SET SPC OFFSET TO 51)
Weld Schedule #04 - 12 Welds Made (Bins 51–62)
Weld Schedule #05 - 12 Welds Made (Bins 63–74)
Weld Schedule #06 - 14 Welds Made (Bins 75–88)
After establishing a bin number, the program stores the data
for each weld made in its own individual bin. The bin
numbers increase by one each time a weld is made, until
another schedule with a different offset is executed.
Bin #99 is the last usable bin. If the weld control reaches bin
#99 and is still collecting data, the data for each weld will be
stored in bin #99 until a new offset is assigned, therefore
making the data unsuitable for analysis.
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This function does NOT tell the control to collect weld data. It only
assigns a data storage bin number. Refer to the Data Collection Sample
Size and Data Collection Sample Frequency setup parameters described
below for instructions on how to specify data collection.