Tweco VA 4000 Ultra-Feed - Manual (Page 41)

ULTRAFEED VA 4000
September 18, 2012 5-3
a. Refer to Table in welding gun manual for correct
size.
4. Worn or damaged contact tip.
a. Replace contact tip. Refer to Options and
Accessories chart in the Appendix section of
this manual.
D. Wire does not feed with gun switch depressed
1. Check the ground fault indicator light.
a. Remove ground fault (refer to Section 4.13
Ground Fault Operation).
2. Check the continuity of the welding gun trigger
leads with the trigger depressed.
a. Repair or replace the welding gun.
3. Check the gun switch receptacle located on the
feeder for loose or faulty connections.
a. Repair or replace connection.
4. Check the motor lead connections for loose or
faulty connections.
a. Repair or replace connection.
5. Check for a blown fuse on the motor control PC
board.
a. Replace the blown fuse (refer to Section 4.11
Replacing Motor Fuse ).
E. Motor continues to run after gun switch has been
released
1. Check to see if wire feeder is in proper mode (two
step or four step).
a. Refer to the Operation Section 4 in this manual.
2. Check for shorted welding gun trigger leads.
a. Repair or replace welding gun.
3. Check for shorted gun switch receptacle located
on the wire feeder.
a. Remove the short.
F. No wire feed speed (WFS) control
1. Check for a loose WFS control knob.
a. Tighten the WFS control knob.
2. Make sure the ribbon cable assembly is connected
to both J1 of the display PC board assembly and
J1 of the motor control board assembly.
a. Repair or replace ribbon cable assembly.
3. With the power switch ON, measure the DC voltage
on the motor control PC board from FT2-5 (+) to
FT1-5 (-) while adjusting the WFS control knob.
The reading should vary from approximately 1 to
10 vdc.
a. Replace the display PC board.
G. No arc voltage (VOLTS) control
1. Make sure the local/remote switch on the power
source is in the remote position.
a. Refer to the power source owner’s manual.
2. Check for a loose VOLTS control knob.
a. Tighten the VOLTS control knob.
3. Make sure the ribbon cable assembly is connected
to both J1 of the display PC board assembly and
J1 of the motor control board assembly.
a. Repair or replace ribbon cable assembly.
H. Wire does not feed with INCH button depressed
1. Check the INCH/PURGE switch located on the wire
feeder for loose or faulty connections.
a. Repair or replace connections.
I. Gas does not flow with PURGE button depressed
1. Check the INCH/PURGE switch located on the wire
feeder for loose or faulty connections.
a. Repair or replace connection.
J. Feed Monitor Display does not function
1. Make sure the ribbon cable assembly is connected
to both J1 of the display PC board assembly and
J1 of the motor control board assembly.
a. Repair or replace ribbon cable assembly.