ProArc PT-502, Owner'S Manual

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11
3.2 TROUBLESHOOTING GUIDE
SYMPTOMS POSSIBLE CAUSES / REMEDIES
Power indicator LED does not
illuminate.
A. Blown fuse
：
Check the fuse, replace fuse when necessary.
B. Input power switch malfunction
：
Check and replace the power
switch.
C. Check for any loose cable connection between Control Board
and Switch Board.
D. LED malfunction, replace Switch Board.
E. Power supply malfunction, use a voltmeter and check power
supply’s 24VDC output.
Motor has no motion.
A. Damaged motor
：
Use ohmmeter to measure CM1 female plug
pin1 & Pin2 and It should read around 2ohm. Replace motor
when reading is either 0 (short circuit between wires) or infinite
(broken wires)
B. Check motor power cable for loose or disconnect cable
C. Damaged foot switch
：
Step on the footswitch and use an
ohmmeter to measure footswitch connector pin4 and pin5. The
reading should be 0 (short circuit). Replace the footswitch when
necessary.
D. Inspect Control Board JP2 for loose connection.
E. Inspect Control Board fuse F1.
Welder start output no response.
A. Damaged Weld / Test toggle switch (SW4), replace Switch
Board.
B. Inspect Control Board JP3 for loose connector.
Forward / Reverse rotation function
no response.
A. Switch Board
：
Step on the footswitch and flip the CW/CCW
toggle switch (SW1). Observe the TR and TL LED on the
Control Board. If both LEDs have no response, replace the
Switch Board.
Display Problem
A. Display malfunction.
B. Inspect cable between Switch Board and Display JP1 connector
for any loose connection.
Overload (Blinking Red LED)
Inspect the work and make sure it isn’t over-spec ( weight /
eccentricity..etc ). Place the Work / Move switch (SW2) in “OFF”
position to reset the system.