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Service TrainingService Training

Invertec ® PC65 - PC105

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PC 65PC 105

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PC 65

A Output curret settingB Gas PurgeC Power ON/OFF LEDD Output LEDE Gas alarm LEDF Thermal LED

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PC 105

A Output current settingB Gas PurgeC Power ON/OFF LEDD Output LEDE Gas alarm LEDF Thermal LEDG Cutting LEDH Remote switch I Remote connector

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Torch & RemoteConnectors

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PC65 PC105General Information

• Plasma is a gas heated to a very high temperature (>10.000°C)

• The gas is ionized, thus being able to conduct an electric current

• A narrow orifice on the nozzle of the torch constricts the arc

• The heat of the arc melt the metal • The high velocity jet blows away the molten metal• Voltage drop in the arc is => 80 + (0,4 x A(output

current ))

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The pilot arc (non transferred

arc)

• A pilot arc is necessary to ionized the gas and to provide a conductive path between the electrode and the torch tip or nozzle

• To strike the pilot arc two methods are mainly used:– High frequency that generates a spark

between the electrode and the torch tip– The touch start with movable electrode that

touches the tip being momentarily shorted, then retracts immediately to establish the cutting arc • The pilot arc provides an ionized,

conductive path• When the torch is close enough to the

workpiece, so that the flame touches it, the cutting arc can be established

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Pilot arc relay

Reed Switch

Torch sideMachine Side

Arc transfer system

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What we need for a correct

cut

• Air supply– pressure at the inlet of the gas regulator

must be between 5 and 7,5 bar ( approx. from 72,5 to 108,5 PSI )

– oil in the air creates severe problem– humidity in the air creates higher orifice’s

and electrode’s consumption and more DrossDross

• Consumables– check the consumables conditions– worn consumables reduce the cutting

capability and increase the DrossDross production

The Torch needs:The Torch needs: 130 l/min for PC65130 l/min for PC65 180 l/min for PC105180 l/min for PC105

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What we need for a correct

cut• …….Consumables

– use the orifice according to the Cutting Current

– Current Orifice• 30 A 0,8mm• 50 A 1,0mm• 70A 1,2mm• 100A 1,3mm

• Distance from the work pieceThin plate: slightly touching the work pieceThick plate: keep a distance of 3mm or using the spacer(higher distance will increase the life of the consumables but it will reduce the cutting capability)

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Technical Specifications

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Technical informationPC65 - PC105

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PC65 / PC105 wiring diagram

Input Bd.

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PC65 input board

400Vac

To Fan

Aux voltage to control circuits

575 Vdc to inverter board

3ph rectifier bridge

Start relay + start resistor

Input filter capacitors

NTC gives delay for start relay

Auxiliary transformer

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PC65 input board

PC65 input board

3ph rectifier bridge

start resistor

start relay

Auxiliary transf.

Filter capacitors

Input Line

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PC105 input board

Aux voltage to control circuits

Auxiliary transformer

To Fan

3x 2ph rectifier bridges

NTC gives delay for start relay

400Vac 575 Vdc to inverter board

Start relay + start resistor

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PC105 input board3 x 1ph

rectifier bridges

start relay

Auxiliary transf. Filter

capacitors

start resistor

Input Line

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PC105 input board

PC65 / PC105 wiring diagram

Inverter Bd.

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PC65 / PC105 inverter board

Switching freq= 30KHzMax Vin = 650Vdc => 460Vac

Duty Cycle trimmer ( set at

40%)

Max Vin trimmer ( set for max

650Vdc)

Max output current Do not adjust !!!

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PC65 inverter board

Snubber diodes

Recovery diodes

IGBT

IGBT

Ammeter trasformer to read the primary

current

P.W.M.

Max Vin trimmer

Thermal sensor

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PC105 inverter board

Snubber diodes

Recovery diodes

IGBT

IGBT

Ammeter trasformer to

read the primary current

P.W.M.

Max Vin trimmer

Thermal sensor

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PC65 / PC105 wiring diagram

Output Block

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PC65 / PC105 output board

To Work

Pilot arc

Torch Trigger

Torch electrode

Pilot arc relay

Reed switch

Output rectifier diodes

Magnetic field

recovery diodes

Thermal sensor

Shunt

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PC105 output board

Pilot arc relay

Shunt Copper coil with

inside reed switch

Thermal sensor

Magnetic field

recovery diodes

Rectifier diodes

Insulated from

heatsink

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PC65 / PC105 wiring diagram

HF board

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PC65 / PC105 HF board

A

B

RL1

R1

C1

L1

T1 T2D1 C2

SP1

C

D

High Voltage transf.

ON-OFF HF relay

From main transformer auxiliary winding

To HF transformer

- PC65 = trimmed 0,3 mm- PC105 = trimmed 0,5 mm

Spark Gaps

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PC65 / PC105 wiring diagram

Control board

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PC65 / PC105 Control board

Arc transfer control + thermal sensor control

area

Remote control circuit Output current control circuit

Relays control circuit - cutting arc solenoid - pilot arc solenoid - pilot arc relay - HF relay

This slide is related to the PC105 control

board

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PC65 Control board

Gas purge switch

Output current potentiometer

Max output current setting

trimmer

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PC 105 Control board

Gas purge switch

Output current potentiometer

Max output current setting

trimmer

ON/OFF remote control

Remote control connector

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PC65 / PC105 wiring diagram

Air solenoid circuit

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PC65 / PC105 Air circuit

Air pressure switch setted

at 4 barFirst air solenoid

standard

Second air solenoid this one has a small hose inside that is calibrated

for the pilot arc

- PC65 = Second gas solenoid hole Ø 1,5mm - PC105 = Second gas solenoid hole Ø 1,6mm

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PC65 / PC105 torch wiringFront panel safety

sleeve micro switch

Torch trigger

Torch safety contact