Lincoln Electric power wave ac/dc 1000 sd Operator's Manual page 27

A-18
CABLE INDUCTANCE, AND ITS EFFECTS
ON WELDING
Excessive cable inductance will cause the welding
performance to degrade. There are several factors
that contribute to the overall inductance of the cabling
system including cable size, and loop area. The loop
area is defined by the separation distance between
the electrode and work cables, and the overall welding
loop length. The welding loop length is defined as the
total of length of the electrode cable (A) + work cable
(B) + work path (C) (see Figure A.11). To minimize
inductance always use the appropriate size cables,
and whenever possible, run the electrode and work
cables in close proximity to one another to minimize
the loop area. Since the most significant factor in
cable inductance is the welding loop length, avoid
excessive lengths and do not coil excess cable. For
long work piece lengths, a sliding ground should be
considered to keep the total welding loop length as
short as possible.
FIGURE A.11
POWER
WAVE
B
REMOTE SENSE LEAD CONNECTIONS
Voltage Sensing Overview
The best arc performance occurs when the Power
Wave ® AC/DC 1000 ® SD has accurate data about the
arc conditions. Depending upon the process, induc-
tance within the electrode and work cables can influ-
ence the voltage apparent at the studs of the welder,
and have a dramatic effect on performance. To coun-
teract this negative effect, remote voltage sense leads
are used to improve the accuracy of the arc voltage
information supplied to the control pc board.
There are several different sense lead configurations
that can be used depending on the application. In
extremely sensitive applications it may be necessary
to route cables that contain the sense leads away
from the electrode and work welding cables.
CAUTION
If the remote voltage sensing is enabled but the
sense leads are missing, improperly connected
extremely high welding outputs may occur.
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INSTALLATION
A
C
WORK
POWER WAVE
Electrode Voltage Sensing
The remote ELECTRODE sense lead (67) is built into
the wire feeder control cable (K1785) and accessible
at the wire drive. It should always be connected to the
Contact Assembly where the Weld Cable is connect-
ed. Enabling or disabling electrode voltage sensing is
application specific, and automatically configured
through software.
Work Voltage Sensing
The use of a remote work voltage sense lead is
always required. The Power Wave
is shipped from the factory with the remote work volt-
age sense lead enabled. It must be attached to the
work as close to the weld as practical, but out of the
weld current path. For more information regarding the
placement of remote work voltage sense leads, see
the section entitled "Voltage Sensing Considerations
for Multiple Arc Systems." The remote WORK sense
lead (21) can be accessed at the four-pin WORK
sense lead connector located on the back panel of the
Power Wave AC/DC 1000 SD.
NOTE: All of the machines of a given arc group
(Master and Slaves) will relate to the
Voltage Sense Lead of the Master machine.
Never connect the WORK sense lead at two differ-
ent locations.
ELECTRIC SHOCK can kill.
• Do not touch electrically live parts or
electrodes with your skin or wet
clothing.
• Insulate yourself from the work and
ground.
• Always wear dry insulating gloves.
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® AC/DC 1000 ® SD
AC/DC 1000
®
CAUTION
WARNING
A-18
SD
®