Selco Genesis 240 TLH, Repair Manual

Page: 14 / 82

96 Description of machine operation
5.5)
Control circuits ( front panel ) (o).
(see fig. 11-12)
G 240 (FP104)
These circuits, which are contained in card 15.14.239 fitted at
the rear of the machine front panel, enable the following:
- setting of welding current by means of the potentiometer
- setting of welding current increase percentage via potentiometer
- selection of function mode MMA / TIG (LIFT)
When the selector switch is in MMA (low) position, open circuit
voltage is available on the machine terminals when it is powe-
red, and further, the hot-start, arc-force, and overheating
protection functions are all enabled.
When the selector switch is in TIG (high) position, open circuit
voltage increases when the machine is powered and, further-
more, current is limited to 30 A while the electrode is short-cir-
cuited and until it is raised.
Two leds are present with diagnostic functions.
Moreover, a potentiometer for setting delivered current are fit-
ted on card 15.14.239, but can be accessed only when the
machine is open.
k)
a)
o)
l)
i)
j)
d) e) f) g)
h)
e)
c)
n)
m)
b)
FIG. 11