56 - Excessive Duration Of Short-Circuit At Output; 57 - Excessive Current In Wire Feed Motor (208) - Cebora KINGSTAR 400TS Manual De Servicio

CEBORA S.p.A.
Carry out instructions for TESTING POWER SUPPLY TO CURRENT TRANSDUCER
(25) AND TESTING CURRENT TO SECONDARY WINDING OF TRANSFORMER, in
section 3.5.8.
Replace control board (37) and/or current transducer (25).

3.6.17- 56 - Excessive duration of short-circuit at output

During welding, the result of detecting output short-circuits is normal, provided they do
not last more than a given period. "Error 56" indicates that the short-circuit has
exceeded this limit.
This situation may be determined by the short-circuit created between the wire nozzle
and gas nozzle on the MIG torch due to dirt or metal dust deposits.
In any case, clean the torch and check:
- wiring between J16/J19 of control board (37) and output terminals – L and + K/N;
- Power wiring between and secondary winding in terminals of transformer (53), diode
assembly (27) and output terminal + K/N;
- Power wiring between central socket of transformer (53), inductor (52) and power
source output terminal - L.
If there are any defective connections, repair them and replace any damaged
components. If necessary, perform a no load operation test, section 3.5.9
Replace control board (37) and/or transformer (53)

3.6.18- 57 - Excessive current in wire feed motor (208)

Motor control board (222) is equipped with a circuit to limit the current supplying motor
(208) to protect it against overload. The circuit detects when the motor current is pulsed
or continuous, if the current exceeds 4A for longer than approximately 2 sec., this
triggers error -57-. The current taken up by the motor is indicated on display H when
"Power Source Status" is selected by means of the relevant button (see fig. 3.6.1a-b)
This overload is mainly determined by mechanical causes, such as dirt in the gear
motor gears, thread guide rod n against the roller, difficulty in feeding the thread spool,
constriction in the thread sheath along the torch cable, etc.
Therefore, clean the gear motor assembly and check whether the problem persists
during operation without wire feed.
In this case, the problem probably lies in deterioration of the motor winding or of the
mechanical gear set built into the motor and requires replacement of motor (208).
If necessary, perform the wire feed motor operating tests in section 3.5.7.
3301045
Fig.3.6.1a Fig.3.6.1b
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17/09/2019