Cebora SYNSTAR 200 T Manual De Servicio página 20

Given the particular type of installation, direct soldering
to connector J6 (J8 on art. 324) of power board (45), in this
manual the board INV is considered integral part of the
power board (45).
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 (45), the primary
and secondary current feedback signal, the power source
output voltage signal and the temperature signals from the
NTC sensors, on power card (45).
The INV board communicates with the panel board (48),
that acts as power source master control, via RS422 seri-
al 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 in-
put is sent also to the services transformer (62) (installed
on power board (45) on art. 323) that delivers the voltage
supply for all welding system circuits.
The services transformer (62) secondary voltages are:
− art. 323, see Fig. 2.3.1 and Connectors map, par. 5.6:
− 24 Vac, for all welding system control circuits pow-
er supply;
− art. 324, see Fig. 2.3.2 and Connectors map, par. 5.7:
− 30 Vac for the power source control circuits power
supply;
− 18 Vac for the isolated power supply of the interface
circuits with the cooling unit (optional);
− 220 Vac, supplied from a services transformer (62)
intermediate socket, for the cooling unit power sup-
ply through socket L on the power source rear panel.
The inverter is made up of four igbt connected in an
"H-bridge" configuration, driven by the driver circuits lo-
cated in proximity of the igbt and directly controlled by
the INV board.
The task of the inverter is to generate the square-wave al-
20
Fig. 2.3.1 (art. 323)
NOTE
ternating voltage for T4 power transformer.
Welding current is adjusted by modulating this voltage
appropriately.
On the power board (45) is installed a TA, T3, inserted on
the T4 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 T4 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 L3 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 (45),
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 (10
on art. 324) connected to a shared cathode and provides
a positive output voltage with respect to the T4 power
transformer central socket. In truth these diodes are
enclosed in modules with two diodes each.
The Hall-effect current transducer (58), inserted on the
power board (45) output cable, sends to the INV board the
secondary current feedback signal, used to regulate the
welding current.
On art. 323, an other secondary winding of the T4 power
transformer, during inverter operation, delivers auxiliary
energy to the supply for wire feeder motor control circuits,
present on the panel board (48) (+VDC-MOT).
On art. 324, this power is supplied by the services
transformer (62), using the same power supply circuits of
the power board (45).
From power board (45) VITE1 and VITE2 output
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 sources art. 323 and 324 the wire feeder unit
is integrated and is composed by the gearmotor and the
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