MK Products Python Rev.D - Manual (Page 17)

Python Owner's Manual - Page 10
Troubleshooting Guide
Regardless of which torch or feeder used, all MK Products’ push-pull guns
operate on the same principle. 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 torch 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 torch motor is controlled by a solid state speed
control located in the feeder, and a pot located in the torch. The torch 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 torch activates both the slave motor and
torch motor circuits in the cabinet. Therefore, if the slave motor and brake
solenoid operate, but the torch does not, look more toward the torch motor’s
24 V circuits, speed control, control cable, or the torch motor. If nothing
operates, look more toward the slave motor’s input, micro switch leads, or
micro switch.
Testing The Torch
Reference the "W" clocked torch wiring diagram on
the Python ® electrical diagram for information
about pin-outs and locations.
Motor Check
Remove the torch connector from the cabinet.
Using the torch Amphenol connector, check the resistance across pins
“A”
and “B” (motor leads). The resistance across the motor should be between
5 - 10 ohms as the potentiometer is turned.
If an open circuit or short exist, check the motor leads and motor
independently.
Testing the Potentiometer - “W” Clocked
Using the torch amphenol connector, check the resistance across pin
“D”
(wiper) and pin “C”. The resistance should vary from 0 - 5K ohms as the
potentiometer is turned.
Check the resistance across pin
“D” (wiper) and pin “G”. The resistance
should vary from 5K - 0 ohms as the potentiometer is turned.
Testing the Micro Switch
Using the torch amphenol connector, check for continuity across pins
“E”
and “F” when the trigger is pressed.