Voltage Sensing - Lincoln Electric POWER FEED 10M SINGLE/DUAL SVM172-A Service Manual

AA-5
The Power Feed 10M Dual Wire Feeder is factory set
for Electrode Positive welding.
Most welding procedures use Electrode Positive weld-
ing. Some Innershield procedures may use Electrode
Negative welding. For most applications, the Power
Feed 10M Dual Wire Feeder will have both sides of the
Wire Drive set to the same polarity. To weld with oppo-
site polarities, each head would have to be welding on
isolated work pieces and the weld cable attaching the
two feed heads would have to be removed.
To change the DIP switch inside the Power Feed 10M
Dual Wire Feeder for electrode polarity:
1. Turn off power at the welding power source.
2. Remove the rear access panel on the wire drive.
3. Locate DIP switches on BOTH Wire Drive Boards.
4. Set DIP switch #7 on BOTH Wire Drive Boards to
the desired polarity.
DIP Switch #7 Position
Polarity
ON (Up) - (negative) polarity
OFF (Down) + (positive) polarity
5. Assemble the rear access panel to the wire drive.
6. Restore power.
INSTALLATION
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POWER FEED 10M SINGLE/DUAL

VOLTAGE SENSING

The best arc performance occurs when the
PowerWaves have accurate data about the arc condi-
tions. Depending upon the process, inductance within
the electrode and work lead cables can influence the
voltage apparent at the studs of the welder. Voltage
sense leads improve the accuracy of the arc conditions
and can have a dramatic effect on performance.
Sense Lead Kits (K940-xx) are available for this pur-
pose.
CAUTION
If the voltage sensing is enabled but the sense
leads are missing, improperly connected, or if the
electrode polarity switch is improperly configured,
extremely high welding outputs may occur.
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The ELECTRODE sense lead (67) is built into the con-
trol cable, and is automatically enabled for all semi-
automatic processes. The WORK sense lead (21) con-
nects to the Power Wave at the four pin connector
located underneath the output stud cover. By default
the WORK voltage is monitored at the output stud in
the Power Wave 455. For more information on the
WORK sense lead (21), see"Work Voltage Sensing"
in the following paragraph.
Enable the voltage sense leads as follows:
TABLE AA.2
Process Electrode Voltage
Sensing 67 lead *
GMAW 67 lead required
GMAW-P 67 lead required
FCAW 67 lead required
GTAW Voltage sense at studs
GMAW Voltage sense at studs
SAW 67 lead required
CAC-C Voltage sense at studs
* The electrode voltage 67 sense lead is integral to the
control cable to the wire feeder.
AA-5
-
Work Voltage
Sensing 21 lead
21 lead optional
21 lead optional
21 lead optional
Voltage sense at studs
Voltage sense at studs
21 lead optional
Voltage sense at studs