Filter Board (7) 5602555; Services Board (6) 5602552 - Cebora 337 Manual De Servicio

CEBORA S.p.A.
(36) are fixed to the dissipater (39). The purpose of the network snubber is to limit the
voltage spikes at the ends of the diodes when they commutate.
The positive output of the diode bridge rectifier (35) is connected to one end of the
output choke (53). The other end of the output choke (53) goes into the diode board
(32) then passes through two Hall-effect current sensors and then out to connect to the
positive fast output connector. The negative output of the diode bridge rectifier (35) is
connected to the negative fast output connector.
The power source power outputs, to which the welding torch is connected, are
collected in the central adapter on the front panel. This is a multiple connector that
incorporates a power socket for the welding torch electrode, two contacts for the
welding torch nozzle, two contacts for the START button, four contacts for torch type
recognition and a pneumatic fitting for the air. This central adapter is equipped with a
protection device (62) A reed switch (59) fixed to the back of the front panel (56)
detects the presence of the protection device (62) and, if missing, it prevents operation
of the power source.

2.4 Filter board (7) 5602555

The three mains phases - U, V and W - enter the board in the points labelled FS1,
FS2 and FS3 then exit after having passed through a common mode choke in points
FSP1, FSP2 and FSP3.
The three wires connected to points FSP1, FSP2 and FSP3 are brought to the input
power bridge rectifier (41). In this filter board (7) there are three FASTON connectors
LD1, LD2 and LD3 connected to points FSP1, FSP2 and FSP3. From FASTON
connectors LD1, LD2 and LD3 the three mains phases are brought to the services
board (6).

2.5 Services board (6) 5602552

The three mains phases of the filter board (7) are brought to FASTON connectors F1,
F2 and F3 of the services board (6).
The board detects the sequence of passes through zero of the three phase-to-phase
voltages and sends the related three signals to the control board (48). If the sequence
of passes through zero is not correct, the control board (48) disables the inverter and
sends the ERR 67 error message to the LCD display.
An incorrect sequence of the passes through zero of the phase-to-phase voltage
can occur when a mains phase is missing or, for example, when the mains neutral is
accidentally connected instead of a mains phase.
The two phases coming from FASTON connectors F2 and F3 are brought by
connector J6 to the primary coils of the service toroidal transformer (5).
The service transformer features a primary coil equipped with various sockets so it
can adapt to 208, 230, 400 and 440 V mains voltages
At machine power on the two phases are applied between 0 V and 440 V given that
the control still does not know what the mains voltage is. The 22 V secondary coil is
brought from the service transformer to connector J19 of the control board (48). This
alternate voltage is rectified and used to create both the power needed by the boards
and to determine the mains voltage that is present.
3302336-B
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20/12/2019