Selco Genesis 240 TLH, Руководство по ремонту

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Description of machine operation 95
G 240 TLH :
- in MMA : Same as the G 240 version but, in this case, in
addition to the arc force current increase percentage, the hot
start percentage can also be adjusted from 0% to 100% via the
panel (both with the setup function).
- in TIG (lift) : same as version G 240 .
- in TIG (H.F.) : initial current increase following triggering of
H.F. (fixed value).
An inverter protection circuit is also present which blocks
modulation when the power supply line voltage drops below or
oversteps the 310 Vac - 470 Vac range for a few seconds. If the
line voltage returns within the permitted limits, re-set occurs
automatically after a few seconds in the case of the G 240; to
re-set the G 240 TLH, press any button on the front panel.
All the machine electronic circuits are powered by the voltages
produced by a switching power supply on board 15.14.254, the
input of which is supplied with a voltage of 230 Vac via the auxi-
liary transformer (l).
With respect to GNDL reference potential, the following
voltages are generated:
• +17Vdc
• +5Vdc
• -10Vdc
• +15Vdc
• -15Vdc
The +5Vdc power supply is supplied also to board 15.14.239
(G 240 front panel) for control of the leds.
The +15Vdc and -15Vdc power supplies are supplied also to
current transducer (Hall effect probe) and to board 15.14.236
(G 240 TLH front panel).
FIG. 10
n)
m)
k)
a)
o)
q)
r)
l)
c)
b)
i)
p)
j)
d) s) e) f) g) h) e)