In Mig, Arc Difficult To Strike, The Arc Goes Out Immediately After Lighting; When Start Button Is Released, The Wire Sticks To The Workpiece (Ineffective Motor Braking) - Cebora TRI STAR MIG 1635/M Service Manual

CEBORA S.p.A.
♦ Replace power (32) and/or control (29) boards.
♦ Check connection between diode group heat sink on power board (32), inductor (28) and
power source +(H) output terminal, and between TP9 on power board (32) and power source
–(G) output terminal. If you find loose connections, tighten and replace any damaged
components.
♦ Check wiring between J7 and J3 of control board (29) and J4 of power board (32), between J1
of control board (29) and J1 power board (32), power source +(H) output terminal and J7 of
power board (32). If you find loose connections, tighten and replace any damaged
components.
♦ Make sure control board (29) power supply performing, if necessary, the CONTROL
BOARD (29) POWER SUPPLY TEST, of par. 3.3.1.
♦ Replace power (32) and/or control (29) boards.

3.3.9 - In MIG, arc difficult to strike, the arc goes out immediately after lighting.

"Hot-Start", "Soft Start" and "Impedance" functions, available in the "Service Functions"
menu (see Instruction Manual), can assist welding start.
Therefore, when dealing with start-up problems and difficulty in maintaining the arc, we
recommend:
− Carrying out welding tests, changing "Hot-Start", "Soft Start" and "Impedance" functions
values and, if necessary, the working program with one similar to the one being used, if
available.
− Checking the compatibility of the torch with the type of welding being carried out, and
especially matching the torch nozzle with the wire being used.
− Checking the wear status of the torch and its components, replacing them if necessary.
− Replace the control board (29).
3.3.10 - When start button is released, the wire sticks to the workpiece (ineffective motor
braking).
WIRE FEEDER MOTOR (31) BRAKING TEST.
Control board (29), connector J8, terminals 2 and 1 (gnd) = fig. 5.2.1, upon releasing the start
button and with open-circuit power source. The wire feeder motor stops immediately.
♦ If fig. 5.2.2 is found (the motor slows from its own inertia), the braking circuit on
the control board (29) does not work, replace control board (29).
♦ Carry out the WIRE FEEDER MOTOR (31) TEST, par. 3.3.6.
♦ Make sure that there are no mechanical impediments preventing the wire coil from stopping
despite the braking action of the motor (ex.: sliding by wire feeder rollers, improperly
adjusted roller spring).
♦ Replace the control board (29) and/or motor (31).
3.302.233
Correct?
YES
NO
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22/09/2008