MK Products Python LX Fronius Com ACWC - Manual (Page 17)

Python ® LX Fronius Compatible™ Owner's Manual - Page 10
Troubleshooting Guide
Regardless of which gun 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 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.
Testing The Gun
Reference the 9-pin rectangular diagram
on the Python LX Fronius Compatible electrical diagram
for information about pin-outs and locations.
Motor Check
Remove the connector from the cabinet.
Using the 9-pin connector, check the resistance across pins
“1” and “6”
(motor leads).
If an open circuit (more than
K ohms) or short (less than 2 ohms) exists, check
the motor leads and motor independently.
Testing the Gun Potentiometer
Using the 9-pin connector, check the resistance across pin “3” (wiper) and
pin “2”. The resistance should vary from 0 - 5K ohms as the potentiometer
is turned.
Check the resistance across pin
“3” (wiper) and pin “7”. The resistance
should vary from 5K - 0 ohms as the potentiometer is turned.
Testing the Micro Switch
Using the 9-pin connector, check for continuity across pins “9” and “5” when
the trigger is pressed.