THEORY OF OPERATION

E-4

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FIGURE E.5 - Pilot Arc

 

 

 

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PILOT ARC

nozzle to the electrode in the torch head and then

TOC

TOC

 

on to the torch bulkhead connector, which is con-

The Pro-Cut 60 has a smooth, continuous pilot

nected to the negative potential within

the

 

 

 

 

machine. When the torch head is brought close to

Section

Master

arc. The pilot arc is a means of establishing and

surface and the cutting arc is established.

This

The pilot arc current flow is from the positive

 

 

transferring the arc to the work piece for cutting.

the work piece the pilot arc transfers to the work

 

 

 

 

to

to

potential work terminal through the R2 resistor

transition takes place because of the low resis-

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Return

and CR2 contacts to the pilot lead circuit in the

tance between the torch electrode and the work

 

 

 

 

piece.

 

 

 

torch cable. The pilot current transfers from the

 

 

 

 

 

to Section TOC

to Master TOC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Return

Return

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FIGURE E.6 - Pilot Lead Circuit

 

 

 

 

 

 

 

NOTE: Unshaded areas of Block Logic

 

Diagram are the subject of discussion

PRO-CUT 60

Page 37
Image 37
Lincoln Electric SVM104-A service manual Theory of Operation, Pilot ARC