Cebora SOUND MIG 2035/M Pulse Service Manual page 6

CEBORA S.p.A.
The diode group (56) is made up of two diodes connected to a shared cathode, and provides a
positive output voltage with regard to the central socket of the transformer. Actually, each diode
in the group is in turn made up of two diodes parallel connected together.
The Hall-effect current transducer (33), inserted at the diode group (56) output, sends the
feed-back signal of the secondary current to the control board (27) to regulate welding current.
The choke (29) and diode group (56) outputs, are connected to the power source output
terminals, from which is taken the power source output voltage signal. This signal is used by the
control board (27) to detect short-circuits of the wire on the workpiece during welding, and
consequently adjust the welding current, as well as stop the power source if the short-circuit lasts
too long.
The control board (27) contains the main power source microprocessor.
It supervises management of the other boards, more specialized in their functions, regulates
the welding current and communicates with the panel board (41), which acts as a control panel
for the entire welding system.
The following controls and indicators are present on the panel board (41) (see Instruction
Manual for more information):
− the potentiometers to adjust the output voltage, wire speed, working times and operating
pauses in "spot" or "pulse" mode, and the choke for more or less hot and penetrating welding;
− a set of leds to indicate the operating status;
− a 3-digit display to show material type (in synergic programs), services functions, wire speed,
welding current and error codes;
− a 2-digit display to show the working program selected or the value for the service function
shown by display (G).
Near the output terminals, mounted on the panel board (41), is the push-pull board (43),
which contains the control circuit of the push-pull torch motor, and the signal interface connector
for the push-pull torch.
These signals include:
− Start power source (from push-pull torch button).
− External adjustment of the welding current (UP/DOWN buttons on push-pull torch).
− Inputs for push-pull torch recognition.
− Power supply output for push-pull torch motor.
The power source power outputs are gathered together on the front panel. A central adapter
(38) is set up for the torch, with a built-in power socket, two contacts for the start command, and
a pneumatic socket for gas.
The start signal of the central adapter (38) is similar to the one present in the connector (J1) of
the push-pull board (43) (the connector (S) of the power source); these are alternately enabled
based on the type of torch connected to the power source.
With standard torch, the connector (J1) on push-pull board (43) remains free; the start
command must be applied to the start terminals of the central adapter (38).
With push-pull torch, the start input on central adapter (38) is deactivated, and the start
command must be applied to the start terminals of the connector (J1) on push-pull board (43).
The signals processed by the electronic boards and present at their connectors are listed in the
table in chapter five of this manual.
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24/03/2004