Installation, Negative electrode polarity, Caution – Lincoln Electric INVERTEC SVM199-A User Manual
Page 13: Cable inductance, and its effects on pulse welding
INSTALLATION
A-5
A-5
INVERTEC® V450-PRO
CABLE INDUCTANCE, AND ITS EFFECTS
ON PULSE WELDING
For Pulse Welding processes, cable inductance will
cause the welding performance to degrade. For the
total welding loop length less than
50 ft.(
15.24m), tradi-
tional welding cables may be used without any effects
on welding performance. For the total welding loop
length greater than
50 ft. (
15.24m), the K1796 Coaxial
Welding Cables are recommended. The welding loop
length is defined as the total of electrode cable length
(A) + work cable length (B) + work length (C) (See
Figure A.2).
For long work piece lengths, a sliding ground should be
considered to keep the total welding loop length less
than
50 ft.(
15.24m). (See Figure A.3.)
Output connections on some V450-PRO are made via
1/2-13 threaded output studs located beneath the
spring-loaded output cover at the bottom of the case
front.
Most welding applications run with the electrode being
positive (+). For those applications, connect the elec-
trode cable between the wire feeder and the positive
(+) output stud on the power source (located beneath
the spring loaded output cover near the bottom of the
case front). Connect the other end of the electrode
cable to the wire drive feed plate. The electrode cable
lug must be against the feed plate. Be sure the con-
nection to the feed plate makes tight metal-to-metal
electrical contact. The electrode cable should be sized
according to the specifications given in the work cable
connections section. Connect a work lead from the
negative (-) power source output stud to the work
piece. The work piece connection must be firm and
secure, especially if pulse welding is planned.
For additional Safety information regarding the elec-
trode and work cable set-up, See the standard "SAFE-
TY INFORMATION" located in the front of the
Instruction Manuals.
Excessive voltage drops caused by poor work
piece connections often result in unsatisfactory
welding performance.
------------------------------------------------------------------------
NEGATIVE ELECTRODE POLARITY
When negative electrode polarity is required, such as in
some Innershield applications, switch the output con-
nections at the power source (electrode cable to the
negative (-) stud, and work cable to the positive (+)
stud.
CAUTION
B
A
C
FIGURE A.2
WORK
V450-PRO
A
C
B
FIGURE A.3
K1796 COAXIAL CABLE
MEASURE FROM END
OF OUTER JACKET OF
CABLE
C
A
B
WORK
SLIDING WORK
V450-PRO
A
C
B
FIGURE A.3
K1796 COAXIAL CABLE
MEASURE FROM END
OF OUTER JACKET OF
CABLE
C
A
B
WORK
SLIDING WORK
V450-PRO