Miller XR Python 25 Ft. Owner's Manual - Page 18
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Check the resistance across pin "F" (wiper) and pin "H". The resistance
should vary from 5K - 0 ohms as the potentiometer is turned.
Testing the Micro Switch
Using the amphenol connector, check for continuity across pins "D" and "G"
when the trigger is pressed.
Section 7
Recommended Spare Parts
Listed in the table bale is the factory recommendation of the necessary spare
parts which should be kept on hand for maintaining proper operation of the
XR™ Python
This list, in no way, indicates that these parts are more likely to fail or cause
equipment damage. This is not an indication of premature failure or defect in
manufacture of said parts.
Section 8
Troubleshooting Guide
To aid in troubleshooting problems with your welding equipment, it is best
to understand the basic theory of operation for this Push-Pull System. The
slave motor in the feeder runs at a fast, constant speed, but has very low
torque. It is always trying to feed more wire than the gun motor wants,
and when the motor gets all it wants, it slows the slave motor, preventing
a bird's nest. Because of the low torque produced by the slave motor, a
brake system is used to prevent wire overrun rather than tension. The drag
adjustment in the feeder is used simply to keep the wire slightly taut, so it will
not pull off the spool while feeding wire.
The high torque 24VDC gun motor is controlled by a solid state speed
control located in the feeder, and a pot located in the gun. The gun motor,
potentiometer, and micro switch are connected to the cabinet/control box via
a control cable and Amphenol connector. If this cable becomes damaged, a
variety of symptoms can occur, depending on which wire(s) break. To test,
check each wire for continuity and shorts.
Remember, the micro switch in the gun activates both the slave motor and
gun motor circuits in the cabinet. Therefore, if the slave motor and brake
solenoid operate, but the gun does not, look more toward the gun motor's 24
V circuits, speed control, control cable, or the gun motor. If nothing operates,
look more toward the slave motor's input, micro switch leads, or micro switch.
welding gun.
®
Recommended Spare Parts List
Qty.
Part No.
1
615-0008
2
005-0694
2
005-0695
1
005-0699
2
005-0701
10
511-0101
5
005-0686
2
931-0137
A/R
206189
A/R
198855
A/R
206195
XR™ Python
Owner's Manual - Page 6
®
Description
Conduit
Trigger Assy Kit
Potentiometer Assy Kit
Handle Kit
Micro-Switch Assy Kit
Drive Roll
Idler Roll Kit
Liner Package - 5 pieces each
Contact Tips
Nozzle
Diffuser