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OM-2221 Page 19
C. Sensing Leads Placement Guidelines For Multiple Arcs
Ref. 804 108-A
BEST
Both sense leads are out of the
current paths.
Both sense leads detect arc volt-
age accurately.
No voltage drop between lead and
trail sense.
Best starts, arcs and most reliable
results.
BETTER
Lead sense is only affected by
weld current from lead.
Trail sense lead is only affected
by weld current from trail.
Due to voltage drops across work
piece, arc voltage may be low,
causing need for deviation from
standard procedures.
BAD
Current flow from lead affects trail
sense.
Current flow from trail affects lead
sense.
Neither sense lead picks up the
correct work voltage, causing
starting and welding arc instability.
Lead
Trail
Lead
Trail
Lead
Trail
Trail
Trail
Lead
Lead
Work
Clamp
Work
Clamp
Trail
Lead
Work
Clamp
Work
Clamp
Trail
Lead
Trail
Lead
Trail
Lead
Welding Power
Source
Welding Power
Source
Welding Power
Source
Welding Power
Source
Welding Power
Source
Welding Power
Source
Remote Voltage
Sense Leads
Remote Voltage
Sense Leads
Remote Voltage
Sense Leads
Remote Voltage Sense Leads
Remote Voltage
Sense Leads
Remote Voltage Sense Leads