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Given the particular type of installation, direct soldering
to connector J10-J11-J12 of power board (56), in this
manual the board INV is considered integral part of the
power board (56).
EN
The board INV contains a microprocessor that manages
autonomously inverter operation.
Receives information on the mains voltage status, through
the OP1 optocoupler, on power board (56), the primary
and secondary current feedback signal, the power source
output voltage signal and the temperature signals from the
NTC sensors, on power card (56).
The INV board communicates with the panel board (47),
that acts as power source master control, via CAM line:
receives the start and set point commands for the inverter
management and sends information on inverter operating
status.
The mains voltage present at the input rectifier bridge input
is sent also to the services transformer (54) that delivers
the voltage supply for all welding system circuits.
The services transformer (54) secondary voltages are:
− 30 Vac for the power source control circuits motor
panel (47);
− 25 Vac for the power source control circuits power
supply ( 56 + INV BOARD );
− 18 Vac for the isolated power supply of the interface
circuits with the cooling unit (optional);
− 220 Vac, supplied from a services transformer (54)
intermediate socket, for the cooling unit power
supply through socket (15) on the power source rear
panel.
The inverter is made up of fourpack module IGBT
connected in an "H-bridge" configuration, driven by the
driver circuits located in proximity of the igbt and directly
controlled by the INV board.
The task of the inverter is to generate the square-wave
alternating voltage for (57) power transformer.
Welding current is adjusted by modulating this voltage
20
Fig. 2.3.1 (art. 386/388)
Fig. 2.3.1 (art. 386/388)
NOTE
appropriately.
On the power board is installed a TA, T2, inserted on the
(57) power transformer primary circuit, that provides the
current feedback signal used to verify that the inverter is
working properly; this signal does not normally affect the
welding current adjustment.
The power transformer (57) provides the secondary circuit
with voltage and current values suitable for welding.
Its secondary circuit is made up of 2 windings connected
to a shared point on the L_OUT inductor terminal, used to
level the welding current.
The other ends of the windings are connected to the
secondary diodes group present on power board (56),
which rectifies the alternating current generated by the
inverter, making it available at the power source output.
The secondary diodes group is made up of 8 diodes
connected to a shared cathode and provides a positive
output voltage with respect to the (57) power transformer
central socket. In truth these diodes are enclosed in
modules with two diodes each.
The Hall-effect current transducer (59), inserted on the
central socket of the power transformer (57), sends to the
INV board the secondary current feedback signal, used to
regulate the welding current.
This power is supplied by the services transformer (54),
using the same power supply circuits of the power board
(56).
From power board (56) J9 terminals, is picked up the
power source output voltage signal, used by the INV
board in order to adapt the power source behaviour to the
arc welding conditions.
In the power source art. 386 the wire feeder unit is inte-
grated and is composed by the gearmotor and the holder
coil support, in the art.388 it is placed on an external wire
feed trolley, in both machines there is a protection carter.
The switch (07) on the wire feeder unit carter provide the
panel board (47) with the signal to stop the power source
in case of carter opening.
This alarm condition is signalled on the control panel with
3302339/A
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