Telwin Superior Plasma 90 HF Скачать руководство пользователя страница 4

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Block 18

Block 19

Block 20

Block 21

Block 22

Block 23

Block 24

Block 25

Block 26

Block 27

Block 28

Block 29

Block 30

Block 31

Block 32

Block 33

Alarm block

Microcontroller

Hall sensor amplifiers

Maximum current control

Overvoltage safeguard

Undervoltage safeguard

Secondary diodes thermostat

Power transformer thermostat

Red LED for general alarm

Yellow LED for air failure

Yellow LED for torch voltage

Green LED for power supply

Yellow LED for phase failure

Current Potentiometer

Air button

Phase failure

Auxiliary transformer

Consisting of: Q3, D12, D15 (control board)
When an alarm is detected, the block drastically limits machine
output current by acting directly on and changing the reference
signal obtained from block 16 (duty cycle maker), in the event
of:
1)Triggering of thermostatic capsule on secondary board

dissipator diodes.

2)Triggering of thermostatic capsule on power transformer.
3)Triggering due to undervoltage.
4) Triggering due to overvoltage.
5) Phase failure at input.
6) Short circuit at output (electrode holder clamp and earth
cable connected to each other or electrode stuck to piece
being welded).

Consisting of: U7 (control board).
Control logic, which manages typical timing for the plasma
cutting cycle. It also drastically limits power source output
current when it detects an alarm. In the event of an alarm it has
a direct effect on block 18 (alarm block), directly changing the
reference signal obtained from block 31 (current
potentiomenter).

Consisting of:U3A, U3C, U4C, U4D and U5 (control board)
They amplify the signals arriving from block 10 (Hall sensors
inductance) and the Hall sensors (Hall1 and Hall2) supplying
two types of output signal:
- analogue signal: used to obtain a current-controlled cutting

arc and pilot arc (signal arriving from the Hall1 sensor);

- digital signal: by means of two comparators placed

downstream of the shunt amplifiers, it is used to obtain two
signals (pilot arc presence and cutting arc presence) which
are sent to the microcontroller (signal arriving from the Hall2
sensor).

Consisting of: R55 (control board)
Processes the information arriving from block 20 (shunt
amplifiers) and uses R55 to adjust the maximum welding
current that can be supplied by the power source.

Consisting of: U5A, R38, R40
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).

Consisting of: U5B, R30, R32
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).

Consisting of: thermostatic capsule ST1 When the
temperature of the secondary board dissipator reaches 70°C
(approx.) this safeguard triggers. Reset is automatic when the
cause for alarm is removed.

Consisting of: thermostatic capsule ST2
When the temperature in the power transformer is too high this
safeguard triggers. It is reset automatically when the alarm
condition is no longer present.

Consisting of: D2 (panel board)
Lights up following triggering of main supply overvoltage or
under voltage or of thermostatic capsules.

Consisting of: D7 (panel board)
Lights up simultaneously with red LED D37 if the air pressure is
insufficient or lacking.

Consisting of: D4 (panel board)
Lights up when the torch button is pressed, and shows the
cutting circuit is activated.

Consisting of: D5 (panel board)
Lights up when the machine is powered and shows the
machine is ready for operation.

Consisting of: D1 (panel board)
Lights up simultaneously with red LED D37 if there is a power
supply phase failure.

Consisting of: R1 (panel board)
Used to create the reference voltage needed to adjust the
output current: varies the current from the minimum to the
maximum value.

Consisting of: S1 (panel board)
When this button is pressed, air will continue to flow from the
torch for approx. 45 sec. It is usually used to cool the torch and
to adjust the pressure on the pressure gauge.

Consisting of: ISO2,ISO3 (opto-isolators board), UT (control
board).
If one of the 3 phases of the main supply fails this safeguard
triggers.

Consisting of:T3
Its purpose is to supply the machine with two alternating
voltages with different values:
- 230Vac to power block 43 (fan);
- 18Vac-0-18Vac to power the auxiliary power supply board;
- 9Vac to power block 35 (HF safeguard).

Block 34

SUPERIOR PLASMA 90 HF