WTC MedWeld 3005, Operator'S Manual

Page: 100 / 206

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Phase shift during test fire will NOT vary by voltage compensation. The
reported current will be extrapolated to what the value of current would
have been delivered, using the following calculation:
This is implemented because the test fire is a single-cycle pulse, and the
control is monitoring only changes in resistance (rather than changes in
current).
80 VERIFY TIPS DOWN EVERY nn CY nn TIMES
This function lets you verify that the electrode tips are
making full contact with the work piece, using the control’s
dynamic squeeze capabilities.
During this function, the control fires one cycle of weld
current at the percent entered for the Tips Down Test Fire
setup parameter, then monitors the weld current provided
and the power factor.
This is compared to the value programmed in the Tips Down
Verified Current setup parameter, (described on page 6-14). If
the primary current detected exceeds the value programmed,
the control proceeds to the next function in the weld
schedule.
If the current is less than the value programmed, the control
waits for the number of cycles programmed (nn CY), then
repeats the test fire. This wait-and-fire process continues up
to the programmed number of tries (nn TIMES).
If the current never reaches the value programmed, the
control generates a TIPS NOT TOUCHING fault and
schedules in No Weld. (Refer to “Dynamic Squeeze Features”
on page 5-7.)
81 SLOW CYLINDER TEST EVERY nn CY nn TIMES
This function is similar to the previous function (VERIFY
TIPS DOWN), but reports a different fault. It will schedule in
Weld mode even when it detects a fault.
If the primary current detected by the control exceeds the Tips
Down Verified Current: nnnn setup parameter, it proceeds to
the next function in the weld schedule.
If the current is less than the setup parameter, the control
waits the number of cycles programmed (nn CY), then
repeats the test fire.
Current Reported =
Current Measured x Nominal Voltage
Measured Voltage