-4-
Block 25
Block 23
Block 27
Block 28
Block 29
Block 30
Block 31
Overvoltage safeguard
Undervoltage safeguard
Fan
Short circuit detector
Hot Start
Arc Force
Short circuit delay
Consistingof:U3A, R62, R68 (primary board).
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).
Consistingof:U3B,R61,R67(primaryboard).
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).
Consistingof:V1.
Powered directly 230V by block 11 (flyback transformer) and
coolsthepowercomponents.
Consisting of: U3B (hybrid board).
If the welding voltage is below 10V this circuit causes block 30
(arcforce) to trigger.
Consisting of: Q2,Q3,C9 (hybrid board).
At the start of MMA welding, Hot Start generates a temporary
overcurrent based on the current setting made by block 20
(current potentiometer) in order to pre-heat the electrode and
preparetheweldpool.
Consisting of: Q6, Q7, C14 (hybrid board).
If the arc voltage falls below 10V, this block produces a
temporary increase in the output current, so as to detach the
electrodefromthepieceafterithasbecomestuck.
Consisting of: U3B (hybrid board).
If the output shorting persists this block shuts down the
power source via block 16 (alarms).
TECHNOLOGY 150-170-200-186CE/GE
Block 17
Block 18
Block 19
Block 20
Block 21
Block 22
Block 23
Block 24
Alarm LED
Current potentiometer
Welding mode function selector
Shunt Amplifier
Maximum current regulator
Secondary diode thermostat
Inductance thermostat
Galvanic separation
Consistingof:D9 (primary board).
Itisswitched on byblock16(alarms) in the eventof:
1) Triggeringofthermostatic capsule on inductance.
2) Triggeringofthermostatic capsule on secondary diodes.
3) Triggeringduetoundervoltage.
4) Triggeringduetoovervoltage.
5) Short circuit at output (electrode holder clamp and earth
cable connected to one another or electrode stuck to piece
beingwelded).
Consistingof:R16 (primary board).
This is used to set the reference voltage needed to adjust the
output current: when the potentiometer knob is turned the
cursor voltage varies, thus varying the current from the
minimumtothemaximumvalue.
Consisting of: SW1 (primary board)
The switch is used to select the type of welding procedure:
TIG-Lift, Hard or Soft.
Consisting of: U4 (hybrid board)
Amplifies the signal arriving from block 10 (shunt
inductance), making it suitable for block 21 (maximum
current regulator).
Consistingof:R13 (primary board)
Used to regulate the maximum welding current that can be
suppliedbythepowersource.
Consistingof:ST1
When the temperature of the secondary diode dissipator is too
high the thermostat cuts in, sending an alarm signal to block 24
(galvanic separation). It is reset automatically when this alarm
conditionisnolongerpresent.
Consistingof:ST2
When the temperature of the inductance is too high the
thermostat cuts in, sending an alarm signal to block 24
(galvanic separation). It is reset automatically when this alarm
conditionisnolongerpresent.
Consistingof:ISO3 (primary board).
The signals arriving from blocks 22 and 23 (transformer
thermostat and inductance thermostat) are separated
galvanically and sent to block 16 (alarms) for detection of a
possiblealarm event.
TECHNOLOGY 150-170-200-186CE/GE
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