8.3 Measurement of plasma arc voltage.
The plasma arc voltage ( 70 - 170V DC* ) is proportional to the
distance of the electrode from the material being cut. This voltage is used
by the SYSTEM to control the torch distance during cutting. This makes it
possible to maintain a constant height during thermal distortion or uneven
material alignment.
Cutters suitable for CNC applications usually have this voltage
available at the CNC connector ( CPC ). Most ( but not all ) sources for
CNC have a built-in voltage divider that delivers a reduced and safe
voltage usually divided 1/50 or 1/20 to the connector.
Important !!! Make sure what maximum voltage is present at the
measurement connector. Connecting too high a voltage to the DV
connector ( Max 20V ) will irreversibly damage the plasma interface.
Connecting a plasma sources
without voltage divider ( 300V MAX )
Connection of plasma sources with
voltage divider 1:50 ( 20V MAX )
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