49 - Nozzle Current During Cutting; 50 - Torch Central Adapter Protection Not Inserted; 51 - Torch Recognition Failed - Cebora PLASMA PROF 123 ACC Service Manual

CEBORA S.p.A.
♦ Check the wiring between J3 sensor board (52) and J16 control board (47).
♦ With Power Source off, temporarily disconnect J16 from control board (47) and check the
resistance on terminals 5 and 6 of J16 on control board (47)(V_ARC signal). Correct value =
4.7 Kohm approximately. If incorrect, replace control board (47).
♦ Replace sensor board (52) and/or control board (47).

3.4.6 - 49 - Nozzle current during cutting.

When cutting operation starts, the nozzle current must become 0. If not, torch problems or a
poor cutting quality may be caused: this is signalled by error 49.
To analyze the problem perform tests in par. 3.3.10, 3.4.2 and 3.4.4.

3.4.7 - 50 - Torch central adapter protection not inserted.

TORCH CENTRAL ADAPTER PROTECTION SIGNAL TEST.
Control board (47), connector J5, terminals 1(+) and 2(-) = 0 Vdc approximately, with
protection device inserted (reed = closed); +33 Vdc approximately, with protection device
not inserted (reed = opened).
♦ Check wiring between J5 of control board (47) and central adapter (41) protection
reed (31).
♦ Check the correct position of the reed on Power Source front panel. The position
is correct when the magnet on the protection hood corresponds to the reed fitted
on the central adapter (41) support, when the protection device is inserted.
♦ Check the supply voltage for the control board (47), performing, if necessary, the
CONTROL BOARD (47) POWER SUPPLY TEST of par. 3.3.1.
♦ Replace the control board (47).
♦ Replace control board (47).

3.4.8 - 51 - Torch recognition failed.

This alarm signals that the inserted torch is not suitable for the Power Source.
On Plasma PROF 123 ACC actually is possible to install cutting torch CP161 (artt. 1230 or
1231), which is provided with an automatic recognition system.
The recognition signal is delivered by the type of connection set in the torch central adapter.
More precisely:
− terminals 2 and 7 of torch central adapter must be connected together;
− terminals 2 and 8 of torch central adapter are connected to a diode, with anode connected to
terminal 2.
The control board (47) receives the torch recognition signal from the central adapter (41) and
perform the recognition, thus enabling or stopping the Power Source operation.
3.302.269
Correct?
YES
NO
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12/04/2012