Selco Genesis 240 TLH, Repair Manual

Page: 10 / 82

92 Description of machine operation
5.3)
rectifier circuit with overtemperature detection device and
snubber circuit (g) - output filter (h) - levelling inductance with
overtemperature detection device (i). (see fig. 7-8)
The power transformer output is connected to the two current
rectifier diodes fixed on the aluminium radiator by means of
screws.
Like the inverter, the radiator is cooled by the air flow genera-
ted by the fan. The rectifier circuit is protected against overloads
or blocking of the ventilation air flow by a radiator temperatu-
re detection device; this device sends a signal to the control
logic which then locks the inverter and signals the fault to the
front panel.
The diodes are connected to board 15.14.240 by means of cop-
per bus-bars containing the snubber circuit (g) , the function of
which is to suppress the overvoltages produced at the ends of
the diodes during normal operation.
The output board 15.14.238 contains the output filter (h) .
The levelling inductance (i) at the output guarantees a constant
welding current. The inductance is also thermally protected by
means of a winding temperature detection device which opera-
tes as described above.
k)
a)
o)
l)
i)
j)
d) e) f) g)
h)
e)
c)
n)
m)
b)
FIG. 7