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Block 26
Block 27
Block 28
Block 29
Block 31
Block 32
Block 33
Block 35
Maximum current regulator
SCR Driver
Auxiliary transformer
Torch button
Solenoid valve relay and HF
Solenoid valve
HF generator
Consisting of: R105 (control board).
Processes the information arriving from block 25 (shunt
amplifier) and, via trimmer R105, allows calibration of the
maximum welding current that can be supplied by the power
source. The signal is re-dimensioned so that it can be
processed and compared with block 17 (adder).
Consisting of: ISO1,ISO5, Q1, Q2 and ISO2, ISO6, Q3, Q4
(secondary board)
Receives the signals arriving from block 18 (microcontroller)
and makes them appropriate for piloting block 9 (AC/DC
current converter).
Consisting of: T1, D2 (torch button board).
Its purpose is to supply a redimensioned, rectified voltage to
power block 30 (torch button relay).
(torch button board).
Consisting of: TIG Torch
When the torch button is operated, a separate signal is sent to
block 18 (microcontroller), to achieve arc strike and enable the
solenoid valve.
Consisting of: K2 (secondary board).
When the torch button is pressed, block 18 (microcontroller)
activates relay K2 which supplies the mains voltage needed to
power block 33 (solenoid valve) and block 34 (HF generator).
Consisting of: Y1
Supplies an appropriate amount of the desired gas mixture
to strike the arc in the torch and the quantity needed to
operate and cool the torch itself.
Consisting of: HF generator board
Using the signal sent by block 32 (s
), the
generator produces a high frequency signal that is sufficient
for powering block 12 (HF transformer).
olenoid valve relay
Fan
HF safeguard
Consisting of:V1.
Powered directly by block 13 (flyback transformer) and cools
the power components.
Consisting of: K1, R1
The HF safeguard also separates the control board from the
high frequency so as to prevent the residual signal from the
torch button cables from entering the board.
Block 30
TECHNOLOGY TIG 172 AC/DC
Block 17
Block 18
Block 21
Block 22
Block 23
Block 24
Block 25
Adder
Microcontroller
Galvanic separation
Inductance thermostat
Secondary diode thermostat
Control panel
Shunt Amplifier
Consisting of: U13A, U13B (control board).
Collects the information from block 26 (maximum current
regulator) and block 18 (microcontroller), producing a voltage
signal that is suitable for processing by block 16 (duty cycle
maker).
Consisting of: U4 (control board)
Control logic, which manages typical timing for the TIG and
MMA cycles. Also drastically limits power source output
current when it detects an alarm event. In the event of an alarm
it acts directly on block 16 (duty cycle maker) and directly
changes the reference signal obtained from block 23 (control
panel).
Consisting of: U3A, R62, U68 (primary board).
Consisting of: U3B, R61, U67 (primary board).
Consisting of: ISO3 (primary board).
The signal arriving from blocks 19 and 20 (over- and under-
voltage safeguard) is separated galvanically and sent to block
18 (microcontroller) for detection of a possible alarm event.
Consisting of: ST2.
When the temperature of the inductance is too high the
thermostat cuts in, sending an alarm signal to block 18
(microcontroller). It is reset automatically when this alarm
condition is no longer present.
Consisting of: ST1 (secondary board).
When the temperature of the secondary diode dissipator is too
high the thermostat cuts in, sending an alarm signal to block 18
(microcontroller). It is reset automatically when this alarm
condition is no longer present.
Consisting of: Control panel board
Panel for setting and displaying the parameters and operating
modes of the power source, all controlled by block 18
(microcontroller).
Consisting of: U12 (control board).
Amplifies the signal arriving from block 10 (shunt inductance),
and makes it appropriate for block 26 (maximum current
regulator).
Block 19
Block 20
Undervoltage safeguard
Overvoltage safeguard
If the main supply voltage falls below the minimum allowed
value this safeguard triggers (a tolerance of approx. ±15% of
the power supply voltage is allowed: outside this range the
safeguard triggers).
If the main supply voltage exceeds the maximum value this
safeguard triggers (a tolerance of approx. ±15% of the power
supply voltage is allowed: outside this range the safeguard
triggers).
