Lincoln Electric IM716 POWER WAVE 455STT - Manual (Page 19)

A-11 INSTALLATION
POWER WAVE 455
A-11
MULTIPLE ARC SENSE LEAD AND WORK
LEAD PLACEMENT GUIDELINES
Work #2
Sense #2
Power
Source
#2
Power
Source
#1
Arc #1
Arc #2
Work #1
Sense #1
Work # 2
Power
Source
#2
Power
Source
#1
Arc #1
Arc #2
Work # 1
Sense #1
Sense # 2
Current Flow
Power
Source
#1
Power
Source
#2
Work #1
Sense #1
Work #2
Sense #2
Arc #2
Arc #1
Current Flow
Ø
Current flow from Arc #1
affects sense lead #2
Ø
Current flow from Arc #2
affects sense lead #1
Ø Neither sense lead picks up
the correct work voltage,
causing starting and welding
arc instability.
BAD
Ø Sense #1 is only affected by weld
current from Arc #1
Ø Sense #2 is only affected by weld
current from Arc #2
Ø Due to voltage drops across work piece,
Arc voltage may be low, causing need
for deviation from standard procedures.
BETTER
Ø Both Sense leads are out of the current
paths.
Ø Both Sense leads detect arc voltage
accurately.
Ø No voltage drop between Arc and Sense
lead.
Ø Best starts, best arcs, most reliable
results.
BEST
Current Flow