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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