Tweco SC-3000 - Manual (Page 73)

SC-3000
Manual 0-5100 A-3 APPENDIX
PLASMA CURRENT RETURN PATH
The plasma cutting current is generated by the plasma source. The current flows from the negative terminal to the
torch, flows through the arc and the work piece to the cutting table.
From the star point the current flows back to the positive terminal of the plasma source.
To achieve a trouble-free operation, the impedance of the return path must be as small as possible.
For this purpose the proper electrical connection to the star point and to the plasma source have a great influence.
These electrical connections should be well maintained.
Figure 2
Plasma Source
plus
minus
Cutting Table Return Path
Work piece
Star Point
Art # A-08942
Art # A-08943
PROPER ELECTRICAL CONTACT
A proper electrical contact needs connections which are made with bare metal to metal contact. The connections
have to be very tight and should be protected against rust and corrosion.
Grounding connexion has to be connected to the machine ground in the shortest possible way.