Miller XR Python Owner's Manual download pdf (Page 18)

XR™ Python

Owner's Manual - Page 6

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

welding gun.

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.

Recommended Spare Parts List

Qty. Part No. Description

1 615-0008 Conduit

2 005-0694 Trigger Assy Kit

2 005-0695 Potentiometer Assy Kit

1 005-0699 Handle Kit

2 005-0701 Micro-Switch Assy Kit

10 511-0101 Drive Roll

5 005-0686 Idler Roll Kit

2 931-0137 Liner Package - 5 pieces each

A/R 206189 Contact Tips

A/R 198855 Nozzle

A/R 206195 Diffuser

1 2 ... 13 14 15 16 17 18 19 20 21 22 23 ... 30 31

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Miller XR Python Owner's Manual Page 18

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