Tweco HMC-410 - Manual (Page 65)

HMC-410
May 5, 2005 5-3
E. No wire feed speed control, but programming
appears to be correct.
1. Tachometer failure. The normal symptom of tach
failure is that the feed motor runs at full speed
whenever the motor is activated.
a. Adjust or replace PC board in motor housing.
2. Interconnecting cable between the controller and
feedhead is not plugged in or may have a bad
connection or short circuit.
a. Repair or replace interconnecting cable.
3. PS/MC PC board failure.
a. Replace motor control PC board or bad drive
component.
4. Controller board failure.
a. Check wire feed speed control signal on con-
troller board using diagnostic test #2. Replace
controller board if
defective.
5. Blown fuse on the PS/MC board.
a. Replace fuse.
6. Over current shutdown on PS/MC board.
a. Replace fuse.
F. Wire feed motor does not run, but programming
appears to be correct.
1. Cycle test mode is active.
a. Turn off cycle test mode.
2. Interconnecting cable between the controller and
feedhead is not plugged in or may have a bad
connection or short circuit.
a. Repair or replace interconnecting cable.
3. PS/MC board failure.
a. Replace motor control board or bad drive
component.
4. Controller board failure.
a. Check wire feed speed control signal on
controller board using diagnostic test #2.
Replace controller board if defective.
5. Blown fuse on the PS/MC board.
a. Replace fuse.
6. Over current shutdown on PS/MC board.
a. This could be from a bind on the feed, bad
cabling or various other causes. In order to
clear the error, power should be cycled on the
control panel. If the problem persists, the
feeder control cable, feeder, gun/torch, and wire
feed should be thoroughly checked for
blockage and short circuits in the feeder control
cable. EMI can also create this problem, so
check for electrical interference in the area (like
TIG machines).
7. Motor failure.
a. Verify motor/feeder is not frozen or stuck.
Replace motor.
G. Wire feed motor will not inch, but motor will run
during the weld cycle.
1. C/D board failure.
a. Replace C/D board.
2. Controller board failure.
a. Replace Controller Board.
3. C/D board/Controller board ribbon cable
interface failure.
a. Repair or replace ribbon cable.