Phase Adjustment For Multiple Arc Systems - Lincoln Electric power wave ac/dc 1000 sd Operator's Manual

B-11
PHASE ADJUSTMENT FOR MULTIPLE
ARC SYSTEMS
Phase
• The phase relationship between the arcs helps to
minimize the magnetic interaction between adjacent
arcs. It is essentially a time offset between the
waveforms of different arcs, and is set in terms of an
angle from 0 to 360°, representing no offset to a full
period offset. The offset of each arc is set
independently with respect to the lead arc of the
system (ARC 1).
Recommendations:
• For balanced waveforms a phase relationship of 90°
should be maintained between adjacent arcs.
TABLE B.1 - PHASE RELATIONSHIP
ARC 1 ARC 2 ARC 3
Lead Trail
2 Arc
0° 90°
System
3 Arc
0° 90°
System
4 Arc
0° 90°
System
5 Arc
0° 90°
System
6 Arc
0° 90°
System
• For unbalanced waveforms:
– Avoid switching at same time.
– Break up long periods of unchanged polarity
relative to adjacent arcs.
PHASE RELATIONSHIP
Use Phase Relation ship to minimize arc blo w
in multip le arc systems.
(Balanced two arc syst em shown)
0°
(PULL)
500
ARC 1
ARC 2
0
-500
BAD
Best results obtained by alternating and equalizing the duration of
magnetic for ces between adjacent arcs.
OPERATION
ARC 4 ARC 5 ARC 6
Trail Trail Trail Trail
X X X
180° X X
180° 270° X
180° 270° 0°
180° 270° 0° 90°
90°
180°
(PUSH/PULL )
(PUSH)
BAD
GOOD
POWER WAVE
X
X
X
X
® AC/DC 1000 ® SD
B-11