Originally Posted by jcc3inc  Hello,
The approach we took was to monitor the arc voltage; it is typically high, 200 or more volts before the arc is struck. When the arc transfers, the voltage drops to 90-120 volts as current flows form torch to workpiece. When this happens, a relay closure or other signal can be sent to begin the machine motion and enable the auto height operation. I designed these controls around 1990. |
I agree the AHC can sense the Voltage, but this is for arc transfer/arc good signal, here I believe the current flow is sensed for this.
Al.