USBCNC manual
Contents
1. So in the standard setup please set the interpolation Time and fifo Time like this Standard fifo time 0 2 Second Ist setup screen Trajectory Setup LookAheadFeed min angle 3 0000 InterpolationTime 0 0050 fifoTime 9 1000 2nd setup screen Eding BV Plasma Cutting Interpreter AbsoluteCenterCoords IsTurningMachine i DiameterProgramming IsPlasmaMachine a CNCV40100 SIMULATION Operate Coordinates Program Tools Variables IO Setup Help 4 MEAS DELAY 0 10 Wb Feed Speed G M Code Time _ Corner VF 25 ZA 0 100 100 S 0 100 G17 G40 G21 G90 G94 G54 G42 G99 G64P0 1 G97 G50 GO T1 4 2 KP UP 0 40 N0054 F 1 G1 X57 7247 Y18 1358 4 N0055 F 1 G2 X47 7038 Y5 0586 I N0056 F 1 G2 X25 4418 Y12 2920 N0057 F 1 G2 X25 0213 Y28 7617 N0058 F 1 G1 X40 9600 Y40 3419 N0059 F 1 G2 X45 8121 Y40 9163 NOO60 F 1 G3 X48 0489 Y40 1896 NOO61 F 1 G2 X51 6366 Y36 8729 NOO62 GO Z3 0000 Circle entry move Size X99 910 Y99 875 70 000 erkagai eri BOR 08 30 38 LoadJobFile MainFrm cpp 7292 Info Loading di NOO64 F 2 G1 Z 1 0000 08 30 38 LoadJobFile MainFrm cpp 7373 Info Loading jc NOO65 F 1 G2 X0 0000 Y50 0000 08 30 38 LoadJobFile MainFrm cpp 7411 Info Loading jc sais 08 30 38 UpdateRender COpe2. max 300 V Tool Out J11 PIN1 Hyperterm powermax 105 GND Tool Out J11 PIN1 AUX IN 1 J5 PIN3 GND AUX IN 1 J5 PIN5 Plasma is ON Feedback AUX OUT 2 J6 PIN9 Corner Reduce current Optional GND AUX OUT 2 J6 PIN10 The plasma arc signal is used to control the height of the Z axis The signal is high voltage approx 300V and during ignition even several 1000 volts it is brought back to a safe voltage using 1 1 50 plasma voltage divider This divider is already build in into the plasma current source or can be obtained separately from the plasma current source supplier The signal from the 1 50 voltage divider is connected to analog input 5 see drawing above The plasma is started using M3 this switches to tool output ON this can be connected with a relay to the plasma current source The plasma is on is an output from the plasma source to an input of the CPU indicating that the plasma is ON This input is optional The corner output from the CPU is a signal that becomes active when the CNC is reducing velocity in corners This signal can be used by the plasma source if supported to reduce the plasma current Eding BV Plasma Cutting THC control sequence At initial position Move to start position X Y Z pierce height Pierce height is equal to ignition height owitch plasma on M3 Delay pierce delay Move Z down to cutting height otart contour after Meas Control delay activate THC controller Automati
3. LOG AN INPUT VAL this value can be 0 or 1 When set to 1 the values of the analog value are logged to a file for investing The file is made in the CNC4 01 director and gas this format ANALOG MM DD Y Y Y Y HH MM SS txt The tracing performs its function during 1 run then it is switched off automatically so you need to switch it on again for every run you want to use it It can be easily shown with GNUPLOT like this Start GNUPLOT In the console type e g gnuplot cd c program files cnc4 01 gnuplot gt ANALOG 32 1 2013 21 3 32 txt u 1 2 wl It means to plot the data in the file of Column 1 as X and Column 2 as Y with lines connected This is the result of random changing the analog input
4. this is the differential factor for the control loop It makes the dynamic better but it easily makes the control loop oscillate Start wit low values and increase very little every try EE 3 6 3 DEADBAND DEAD BAND 0 50 When VACT VSET is lower than this value the controller does nothing it prevents limit cycling going up down continuously when not needed 3 6 4 Spike filter FILTER TIME 0 05 Next parameter is FILTER TIME This is the time of our spike filter spikes are filtered as well sudden voltage increases when going over a part where there is already cut Suppose we are moving with F3000 and our cutting width is 2 mm F3000 50 mm sec or 2 millimeter takes 0 40 sec The filter time should be bigger than 0 04 to filter this spike away Be Aware the filter influences the control speed negatively Eding BV Plasma Cutting 3 6 5 Hole Detect When we go over a hole or when we pass the end of the plate then the plasma voltage will suddenly rise a lot When we would do nothing the controller will make the Z move downwards fast and cause collision The prevent this we have the hole detection that needs 2 parameters HOLE DET V 25 00 4 k HOLE DET T 0 10 When the voltage difference Vact Vset is more than the HOLE DETECT VOLTAGE and longer than the HOLE DETECT TIME the controller will stop controlling 3 6 6 Tracing for checking the behavior For test purpose an extra parameter is added
5. 3 EI gt tin 3 CNC B V PC Based CNC Control USBCNC PLASMA CONTROL with iCNC600 PLASMA USERMANUAL Document Release O 1 Published by Bert Eding Eindhoven The Netherlands Title USBCNC Plasma user manual Author Bert Eding Date Tuesday 06 January 2015 Document History Version Date Author Comment 15 01 2012 B Eding Initial version for the 1CNC600 CPU O Copyright Eding CNC Holding B V rights reserved Reproduction in whole or in part prohibited without the prior written consent of the copyright owner Eding BV Table of contents Table of contents 1 Introduction 1 1 Context and scope 1 2 Definitions acronyms and abbreviations 2 Torch Height Control 2 1 Interface PLASMA CNC Plasma UI 3 1 General settings for plasma 3 2 The LEDs 3 3 At the top we see 3 buttons 3 4 VACT and VSET 3 5 Corner protection 3 6 Controller parameter settings 3 6 1 KP 3 6 2 KD 3 6 3 DEADBAND 3 6 4 Spike filter 3 6 5 Hole Detect 3 6 6 Tracing for checking the behavior Plasma Cutting 10 11 11 11 11 12 12 12 12 13 13 Eding BV Plasma Cutting 1 Introduction 1 1 CONTEXT AND SCOPE Hyperterm powermax 105 Eding BV Plasma Cutting 1 2 DEFINITIONS ACRONYMS AND ABBREVIATIONS Computerized Numerical Control aie Central Processor Unit a PCB board with a Processor on it DXF Drawing Exchange Format is a CAD data fi
6. cally measure voltage and set as set point if required At end of contour switch plasma To Retract height ron o ds ce c Eding BV Plasma Cutting 3 Plasma UI 3 1 GENERAL SETTINGS FOR PLASMA Some items need to be setup in the cnc ini use notepad or notepad similar program to edit the file This is an example of a working setup PLASMA defaultSetPointVoltage 135 000000 KPUp 0 600000 KPDown 0 600000 KD 0 050000 deadBand 0 500000 filterTime 0 050000 holeDetectVoltage 25 000000 holeDetectTime 0 100000 controlDelay 0 100000 cornerFeedFactor 0 250000 ZMax 0 000000 ZMin 167 000000 adcOffset 60 000000 adcMulFactor 0 1400000 plasmalsOnInputPortID 0 plasmalsCornerOutputPortID 0 plasmaZDownInputPortID 0 plasmaZUPInputPortID 0 plasmaAnalogInputPortID 5 measuredIsSetpoint 1 The adcOffset and adcMulfactor determine the relationship between the input voltage read by the processor and the arc voltage The adcOffset value of 60 resembles the arc voltage where the analog input read is zero The adcMulFactor is calculated by dividing the range through 1000 in this case the range 60 200 140 so the adcMulFcator 140 1000 0 14 The plasma THC needs 1 The iCNC600 CPU 2 An external 1 50 voltage divider to be obtained from the plasma source supplier e g Hyperterm 3 PC with reliable and fast Ethernet because we will reduce the fife time This improves the dynamic of the THC
7. le format developed by Autodesk FIFO First In First Out Buffer HPGL Hewlet Packard Graphical Language GUI UI Graphical User Interface INTERPRETER A software function that is able to read a text file and execute the commands contained therein JOBFILE A job is the text file G code that will be executed by the interpreter Graphical User Interface Pulse Width Modulation G Code CNC specific language to control the movements and IO of a milling machine LAF Look Ahead Feed advanced motion algorithm that ensures minimal machining time Torch Height Control S _ s s PMH d N NRNMN gs tna MW E Eding BV Plasma Cutting 2 Torch Height Control The torch height to the work piece determines the quality of the cutting process The material to cut is not even in height The voltage across the torch during the process is coupled to the height of the torch The higher the torch the higher the voltage will be oince the torch is coupled to the Z axis of the CNC machine the voltage can be kept constant by regulating the height of the torch This can be done by feeding the attenuated and isolated torch voltage to the CNC system This system will control the height of the Z to keep the voltage constant Eding BV Plasma Cutting 2 1 INTERFACE PLASMA CNC Connections Table PLASMA machine iCNC600 Analog In 5 J9 PIN7 GND Analog In 5 J9 PIN8 1 50 Voltage divider Plasma ON Relay Plasma Voltage
8. nGLView cpp 906 Info Size 9 3 4 m L p gt gt gt Single AUTO Blo ud F ise LOAD REDRAW START EDIT GOTO 8 p ArcF crs G28 Fast RT Graph F1 F2 F3 F4 5 F6 F7 F9 F10 100 G30 FastRendering Its about the left panel 3 2 THE LEDs THC ON Corner Up Hole Down Active THCON LEDis ON when THC function is on UP Zis moving UP Down Zis moving down Corner Corner protect active Hole Hole Detect active Active On when control is active The THC is active when several conditions are met e THC function is switch on e Spindle PLASMA is ON e Move is Gl G2 G3 without Z Corner protect is not active Hole detect 15 not active Eding BV Plasma Cutting 3 3 AT THE TOP WE SEE 3 BUTTONS e Spindle ON OFF PLASMA Switches the plasma ON OFF e THC ON OFF switches the THC system ON OFF e Define Z min takes current Z position and define that as minimum for the THC THC will not go lower It is displayed also in the Z readout gauge in RED 3 4VACT AND VSET wc 2120 Auto 1972 MEASDELAY 0 2 e VACT button allows to switch the display between the actual plasma voltage or the following error Vactual Vset e Auto when switched on a automatics measurement will take place at the beginning off the cutting sequence After the Mesa Delay time delay the voltage is measured and set at set point Thi
9. s is performed once for a job e VSET shows the actual Voltage setpoint for the THC controller e Meas delay Sets the delay for automatic measurement and control on When cutting move starts this delay is used before the controller is switched on and the measurement is taken 3 5 CORNER PROTECTION Corner 10 4 The Corner VF setting 1s needed to prevent the torch from diving down at corners At corners the actual Feed becomes lower because of this the Plasma voltage gets higher and the THC will start moving the Z DOWN This is not wanted So when the Feed is lower than specified percentage here the THC control will temporarily be disabled the Z axis will remain at same height 3 6 CONTROLLER PARAMETER SETTINGS There are a few control parameters which can be set here by pressing the button that now showsd KP next parameter becomes visible to be set Default parameters D T D V Ha 06 1002 0s 005 25 Jor Eding BV Plasma Cutting 3 6 01 KP 0 40 KP DOWN 0 40 4 k Standard the KP parameter is shown this controls the THC control speed When to low the Z axis will follow too slow When too high the Z axis will start oscillating There are 2 KP values one for moving UP and one for moving down We have made this because experience learns that that the behavior of the system is different moving up or down 3 6 2 KD When the button shown KP is pressed we will see KD
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