Description Of Mig3840/T Pulse Power Source - Cebora SOUND MIG 3840/T Pulse Service Manual

CEBORA S.p.A.
Customizations of the welding system modes (parameter set-up) and the welding programs
created by the operator are saved in the EEprom in the micro board (543).
In order to concur the substitution of micro board (543) without to lose these data, the
EEprom is mounted on socket so as to be able to be removed from the board and being inserted
in one new board. In the same way it is also possible to transfer the customizations and the
customer programs from a generator to the other, so that this last one is found to operate with the
same identical parameters of the first generator.
With the Factory set-up function it is possible to cancel EEprom memory and to reshape it as
it was to exited new machine from factory. In order to select the Factory function:
− press push-button (AO) and maintaining pressed it press the push-button (E);
− select with grip knob (N), "FAC" function on display (O);
− select with grip knob (Q) one of the functions that appear on display (P), considering how
much it follows:
noP it means that it comes brought back to the factory set-up the operating parameters set-up
(the operating parameters set-up carried out from the customer comes cancelled) and
remain instead stored customized programs realized from the customer.
ALL it means that the control will come brought back to the factory set-up with cancellation
of all operating parameters set-ups and customer programs realized from the customer.
PrG it means that they come brought back to the factory set-up the job programs
(customized programs realized from the customer will be cancelled) and remain instead
stored the operating parameters set-up.
− in order to activate function to press push-button (AP).

2.4 - Description of MIG3840/T Pulse power source.

The MIG3840/T Pulse is a direct current power source with controlled current, consisting of a
three-phase rectifier bridge, a DC/AC converter (inverter), and an additional rectifier bridge.
The main switch (504) powers the filter board (542), which contains the filter to reduce
conducted interference reflected in the mains, and the chokes (516+522) to level the current
absorbed by the mains.
The pre-charge board (562), inserted downstream from the chokes (516+522), contains the
power rectifier bridge, the DC-capacitor (561) pre-charge circuit of the inverter, and the circuits
to analyze the mains voltage. It communicates with the control board (543) through an optically
isolated signals.
The control board (543) is composed from two boards (interface and micro) mounted one on the
other. For greater clarity in the identification of the connectors, in the present manual the two
boards are indicated singularly, and with the same identification number of control board (es.:
control board (543); interface board (543); micro board (543)).
The rectifier bridge converts the alternating mains voltage (400 Vac) to direct current (540
Vdc) suitable for powering the inverter, the DC-capacitors (561) to level this direct current and
the flyback board (539).
The pre-charge circuit of the DC-capacitors (561) is made up of the PTC (PTC1 - PTC8) and
relay RL1 on the pre-charge board (562). The latter is controlled by the micro board (543),
which analyzes the "mains voltage presence" and "DC-capacitors (561) direct current voltage"
signals coming from pre-charge board (562), through interface board (543).
More specifically, check the presence of each phase of the mains voltage and the level of the
direct current voltage at the rectifier bridge output, thus on the DC-capacitors (561).
If the test result is positive, the pre-charge relay RL1 is closed and the power source is
operated; otherwise RL1 remains open and the power source is blocked, while the control panel
(324) displays the cause of the block.
3.302.191
NOTE
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15/02/05