In Mig Mode, When The Start Button Is Released, The Wire Sticks To The Workpiece (Ineffective Motor Braking) - Cebora SOUND MIG 3840/T Pulse Service Manual

CEBORA S.p.A.
3.5.13 - In MIG mode, when the start button is released, the wire sticks to the workpiece
(ineffective motor braking).
To maximize the end of MIG welding, the work programs include the "Burn-Back" function,
adjustable using the keys on the control panel (324) (see Instruction Manual).
In case of difficulty at the end of MIG welding:
− Make sure that the wire feeder motor brakes properly, if necessary performing the WIRE
FEEDER MOTOR (404) BRAKING TEST described below.
− Make sure that the "Burn-Back" function adjustment is working, by carrying out welding tests
with different parameter settings or switching the working program with a similar one, if
available. If you encounter problems, make sure the software versions installed in the welding
system are compatible. Upgrade if necessary by connecting to the Cebora Web site (see par.
2.3 - Description of SOUND MIG 3840/T Pulse system (art. 287)).
− Check the compatibility of the components being used (torch, type of contact tip, wire type
and diameter, type of gas, etc.) with the type of welding being carried out.
− Check the wear status of the torch and its components, replacing if necessary.
− Replace the control board (543) and/or motor control board (232) and/or control panel (324).
WIRE FEEDER MOTOR (404) BRAKING TEST.
Motor control board (232), connector J19, terminals 2 and 1 (gnd) = fig. 5.2.5, upon releasing
the start button and with open-circuit power source (voltage on the wire feeder motor (404)
during correct braking, beginning with the maximum speed of 22 m/min.). The wire feeder
motor stops immediately (braking time approximately 200 msec.).
♦ Check the wiring between connector J19 of motor control board (232) and motor
(404).
♦ If the motor slows down with its own inertia (fig. 5.2.6 or similar), the braking
circuit on motor control board (232) may not be working, in which case replace
the motor control board (232).
♦ Make sure that there are no mechanical impediments preventing the wire coil from stopping
despite the braking action of the motor (ex.: slipping of the wire feeder rollers, improperly
adjusted roller spring, etc.).
♦ Replace the motor control (232) and/or motor (404) board.
3.302.191
Correct?
YES
NO
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15/02/05