NP-20 OPERATING INSTRUCTIONS
Contents
1. x z 10 5 4 6 2 1 3 0 8 7 9 20 0 000 Z ref R rel 20 000 X ref R rel 1 mm r R inch 0 00 Z ref R rel 0 00 X ref R rel 1 mm r R inch x z 10 20 1 P 1 0 1 NP20 an doc edition June 2002 page 27 lt Err 1 gt Two neighbouring edges of input signals A and B are to close together This message can be caused by Exceeding of maximal axis shift velocity Influence of Electromagnetic disturbances on measuring system or any of its component linear or rotary encoder DRO Linear encoder installation alignment is not properly done Machine guideways are looseness Message can be deleted by pressure to key DELETE If any other reason except exceeding of velocity caused this message maintenance repair activities should be done This diagnostic function is available upon a special order lt Err 2 gt Position measuring error Difference of Absolute positions during current and previous pass over reference mark in increments is bigger then value which is set to parameter P6 If absolute coordinate system is not calibrated diagnostic is active If value of P6 is set to 0 this diagnostics is inactive If distance coded reference is used this diagnostics is active Possible reasons for this failure Settings of parameter P15 or P16 define type of reference mark does not correspond to used linear encoder2. 0 8 7 9 abs rel NP20 an doc edition June 2002 page 16 5 1 REFERENCE MODE If the NP20 is equipped with battery back up system option B after switch on it is set to absolute mode REF indications lights steady indicating that absolute position is not calibrated If user like to calibrate absolute position he should by pressing to key REF enter into the reference mode If the NP20 is not equipped with battery back up system without option B the device after a switch on is automatically set to the reference mode Axes indications lights steady indicating that these axes have not been calibrated 5 1 1 CALIBRATION OF ABSOLUTE POSITION WITH REFERENCE MARK Calibration of absolute position requires that device is set to the reference mode and reference value should be entered into the parameter P90 If reference value has not been entered into P90 when device is set to reference mode message ref ___ will appear on the display of corresponding axis In that case user should enter reference value by procedure describe in chapters 5 1 2 or 5 1 3 PROCEDURE DISPLAY NOTES Entrance in the reference mode calibration If reference value have not be entered ref___ is displayed Pass over the reference points on the encoders After reference mark is passed display starts to display the position In the case if auxiliary axis is used first pass the reference in that axis and than in main axis When cali
3. Into distance to go mode is possible to enter from absolute mode through relative mode and presetting in relative mode target position Procedure is described in the diagram bellow PROCEDURE DISPLAY NOTE Device is set to absolute mode no axis is selected Rel indications light steady position display s is set to 0 000 Entrance into the relative mode Axis indicator light steady Choose the axis which will be position by distance to go mode Decimal point on last typed digit pulsate Type in a target absolute position Position display shows typed numbers Distance to target position is displayed Confirmation of typed target absolute position After confirmation distance from current to target position is shown No number on the axis display Deleting of typed numbers due to typing failure or other reason Old relative position Abandon of target absolute position preset Device is set to relative mode Distance to target position is shown Driving toward zero value on the display Displayed position on selected axis is zero Target position is reached Rel indications switch off target absolute position is displayed Device is toggled to Absolute mode Target absolute position is displayed Device is set to absolute mode X axis is selected x z 5 4 6 2 1 3 0 8 7 9 0 000 Z ref R rel abs rel X abs rel NP20 an doc edition June 2002
4. easy troubleshooting of eventual errors in the measuring system or during the operation If an error occurs a message appears on the appropriate display indicating the cause for the error e g pressure on a wrong key lt Err type gt exceeded max movement speed lt Err 1 gt undetermined parameter lt Err PAr gt etc The messages are deleted and reception acknowledged by the key DELETE Position readout NP 20 is optionally equipped with battery backup system This system assures in the case of power failure storage of absolute position in the moment of power failure When the power is set readout shows the last absolute position before power failure NP20 an doc edition June 2002 page 6 3 INSTALLATION AND CONNECTION OF THE DEVICE 3 1 EXTERNAL DIMENSIONS AND FASTENING S compact table version 250 101 150 161 5 60 205 Z 1 2 ref rel D R X ref rel mm inch Mounting dimension M5 NP 20 Iskra P Panel Build in version Panel mounting dimension 244 0 5 x 145 0 5 Sheet thickness 1 6 mm max 147 5 150 243 101 250 mm inch ref rel ref rel X D R 1 2 Z NP 20 Iskra NP20 an doc edition June 2002 page 7 T Tabletop version 205 250 80 60 12 25 99 72 NP 20 Iskra 1 2 Z ref rel D R X mm inch ref rel Mounting dimension M5 150 227 c Console version 25 193 1
5. of reference values in the P90 parameter 13 5 1 3 Automatic entry of reference values with reference pulse 14 5 2 Absolute position preset reset 14 5 2 1 Preset 14 5 2 2 Reset 15 5 3 Relative position 15 5 3 1 Relative zero setting 15 5 4 Datum points DP0 DP9 15 5 4 1 Datum point selection 16 5 4 2 Datum points setting by manual parameter entry 16 5 4 3 Setting the datum points by position entry 16 5 5 Mm Inch switching over 17 5 6 Halving centring key 1 2 17 5 7 Axis shift velocity measuring 17 6 STATUS AND ERROR INDICATION 18 7 TE
6. to displayed values Xmeas number of increments DD CCC Number of decimal places Type of measurement 0 linear measurement 1 angular measurement in decimal format Counting direction positive direction negative direction Weight factor CCC DD Define the influence of measuring increments to displayed values Xmeas number of increments DD CCC Number of increments counted number of increments from linear or rotary encoder Xmeas measured value number of increments DD integer representation of divide value withouth a rest Number of decimal points B Define the number of digits on the right side of decimal point Can be any number between 0 and 4 Type of measurement A Define the type of measurement 0 Linear measurement 1 Angular measurement in decimal format Counting direction Define the direction of counting when a positive transition of A signal precede a positive transition of B signal Empty Positive direction Negative direction A B CCC DD NP20 an doc edition June 2002 page 12 lt P02 A inc gt As in P01 but it applies to the auxiliary axis Z The parameter shall be equal as for the main axis only the counting direction sign can be different Enter the auxiliary Z on the Z display Delete the auxiliary axis by enter
7. 50 250 ref rel 1 2 Z mm inch ref rel D R X 50 L L 150 200 450 NP 20 Iskra 263 4 Power supply input 100 250V Power switch ON OFF 255 4 O5 6 4x Supply Unit 100 90 60 Power supply output 5V Clearance of at least 120 mm has to be provided for accommodating the electrical connections at rear of the device NP20 an doc edition June 2002 page 8 3 2 CONNECTION Correct connection of the device and of the measuring system are very important for reliable operation especially when the device is applied in strenuous working conditions close to power cables inductive load switches etc The following basic rules should therefore be observed during the connection of the device The housing of the device must always be grounded in the same grounding point as the machine either via the grounding conductor of the mains power supply cable with safety plug or by connecting a special grounding conductor to the grounding screw at rear of the device The cross section of the grounding conductor shall not be less than 1 5 mm and by the shortest route should be connected to main grounding point of a machine Cables with measuring and control signals of the device connectors X Z Z RIE RS232 have to be laid as far as possible from the power cables on the machine and from the other powerful sources of electromagnetic disturbances relays contactors motors transformers s
8. CHNICAL DATA 19 OF DELIVERY NP20 an doc edition June 2002 page 4 NP20 an doc edition June 2002 page 5 1 SCOPE OF DELIVERY Position readout NP 20 for turning milling and boring machines Possible options SI Q R K B Spare fuse link 0 3 A T for 220 V i e 0 6 A T for 110 V Power cable with safety plug for 220 V 50 Hz and three pole socket length 3 m NOTE Meanings of options designations Q auxiliary axis in the X or Z axis R connector RIE only for rotary transducers K interface RS 232 C for serial communication B battery backup 2 GENERAL DESCRIPTION Position can be measured both in transverse and longitudinal axes X Z and in an additional axis Z that is parallel to longitudinal option Q Position value in the auxiliary axis is continuously added and is indicated in the position of the related main axis Z X and Z displays indicate the absolute or the relative position When the relative mode is selected in one or in both axes the related indicator REL is lit In the relative mode it is possible to measure depending on the relative zero which can be selected by pressing the key REL in the current position Incremental linear or rotary measuring transducers with square or sine wave measuring signals are used for position measuring Built in monitoring functions assure reliable operation assistance at work and
9. NP20 an doc edition June 2002 page 1 NP 20 OPERATING INSTRUCTIONS NP20 an doc edition June 2002 page 2 Copyrights 2002 Iskra TELA d o o Printed in Slovenia 2002 NP20 an doc edition June 2002 page 3 CONTENTS 1 SCOPE OF DELIVERY 5 2 GENERAL DESCRIPTION 5 3 INSTALLATION AND CONNECTION OF THE DEVICE 6 3 1 External dimensions and fastening 6 3 2 Connection 6 3 3 Connectors 7 4 ADJUSTMENT TO THE MACHINE 9 4 1 Entry of machine parameters 9 4 2 Entry of technological parameters 12 5 MEASURING FUNCTIONS 13 5 1 Reference mode lt REF gt 13 5 1 1 Absolute position calibration with the reference value 13 5 1 2 Manual entry
10. NP20 an doc edition June 2002 page 19 PROCEDURE DISPLAY NOTE Device is set to absolute mode no axis is selected Axis indicator light steady Choose the axis in which you like to preset new absolute position Axis indicator light steady Decimal point on last typed digit pulsate On numerical keyboard type the required new absolute position New position is displayed Confirmation of new absolute position The old absolute position is loosed No number on the axis display Deleting of typed numbers due to typing failure or other reason Old absolute position Abandon of absolute position preset Old absolute position is maintained Device is set to Absolute mode 5 2 2 RESET of ABSOLUTE POSITIONS If the parameter P11 is set to 0 see chapter 4 1 the absolute position of the measuring axes can be directly reset by RESET key of corresponded axes Reset of absolute position will cause loss of old absolute position if axis was calibrated it will became non calibrate X 5 4 6 2 1 3 0 8 7 9 RES x z 20 x z 20 000 X ref R rel 0 000 X ref R rel NP20 an doc edition June 2002 page 20 5 2 3 Mm Inch SWITCHING OVER The units in which the position is displayed can be toggle between metric s and inch s units by pressure to key mm inch Unit selection is valid for both axes Conversion rate is 1 inch 25 4 mm The status indicator sho
11. Use of encoders with multiple reference marks Exceeding of maximal axis shift velocity Influence of Electromagnetic disturbances on measuring system or any of its component linear or rotary encoder DRO Linear encoder installation alignment is not properly done Machine guideways are looseness Err 2 message can be deleted by key DELETE position display of axis in which failure was happened will show the value in increments of difference in absolute position between current and previous pass press to key DELETE will return NP20 to the mode which was set before failure happened See diagram NP20 an doc edition June 2002 page 28 PROCEDURE DISPLAY NOTE Pass over a reference mark Err 2 message appears on the failed axis Absolute position during current pass over the reference mark is different then during previous pass On the position display of failed axis number is shown This number is difference in increments between absolute position and previous position Position display shows position NP 20 is set to mode which vas selected before failure happened Position displays shows position Old absolute position in failed axis is lost If axis was calibrated it became non calibrated lt Err 3 gt A damage of one or multiple memory cells in internal structure of E2PROM The parameter storing is not stable This failure can be caused by too often changing of parameters valu
12. ate number If corresponded parameter P9X of datum point DPX is not defined empty after selection of datum point is done position display s will show dP0X ___ When datum point is selected indication ref is switch off and information about calibration status is hidden All settings mm inch R D will stays the same as in previous datum point except axis selection which through any transitions became deselected 5 2 7 2 SETTING THE DATUM POINTS BY POSITION ENTRY Datum point s offsets values of parameters P9x can be set by position preset procedure if position preset is done when datum point is selected The device automatically calculates the corresponding parameter values of the datum point and enters them into the memory e g x z 10 5 4 6 2 1 3 0 8 7 9 20 10 000 Z ref R rel 20 000 X ref R rel 0 mm r R inch 0 000 Z ref R rel 0 000 X ref R rel 2 mm r R inch 2 x z 10 20 2 NP20 an doc edition June 2002 page 23 In the above example the device will enter the following value of parameter P91 P91x 20 000 P91z 0 000 You can check it by selecting this parameter PROCEDURE DISPLAY NOTE Device is set to absolute mode datum point 1 no axis is selected Axis indicator light steady Choose the axis in which you like to preset new absolute position Axis indicator light steady Decimal point on last t
13. bration procedure is finish NP 20 automatically return to absolute mode 5 1 3 DETERMINATION OF REFERENCE VALUE WITH REFERENCE PULSE It is used when we want to save an already selected absolute coordinate system so that we can re establish it in case it gets lost when the device is switched off or for other reasons PROCEDURE DISPLAY NOTES Set the NP20 to Absolute mode Shows position In this point NP 20 is set to the absolute mode Drive the tool to known position Shows position It can be done by turning diameter and then measure it by calliper or micrometer Preset the known position to axes Presetting Use the procedure describe in chapter 5 2 1 Shows position Set the NP 20 to reference mode determination Pass the reference marks on both axis In the case if auxiliary axis is used first pass the reference marks in that axis and after in main axis NP 20 will inform the receiving of reference mark by sound After passing of reference mark NP20 will be set to absolute mode and reference value will be entered into the P90 REF REF P NP20 an doc edition June 2002 page 17 EXAMPLE Turning Measuring Presetting Determination NP 20 is set to ABSOLUTE mode NP 20 is set in REFERENCE mode 5 1 2 MANUAL ENTRY OF REFERENCE VALUES IN THE P90 PARAMETER This mode is generally used only for testing e g when we want to enter the zero reference value in both axes NOTE Do n
14. different modes of selection by entering the machine parameter P0 3 14 PROCEDURE DISPLAY X NOTES Parameter selection P00 codE codE _ _ _ Alternate designation value display Dashes for empty parameter 3 14 Value selection right point is flashing P00 codE 3 14 Value entry alternate indication of designation and parameter value P01 Incr Switch over to next parameter Abandon of parameter settings or revievieving Having entered the protection code continue entering the remaining machine parameters When you have set any parameter by pressing the key ENTER the next parameter appears on the display In case you do not want to set or change it press the key ENTER in order to choose the following parameter For direct selection of a particular parameter press the key P and enter the parameter number e g P 090 In case of a typing error press the key DELETE and start again the entry P 0 3 1 4 NP20 an doc edition June 2002 page 11 lt P01 Incr gt The counting direction the measuring mode the number of decimal places the weight factor by which a measuring increment affects the last digit in the X or Z displays The weight factor is a fraction with any two or three digit whole number in the numerator and the denominator altogether 5 digits Also the 00 or 000 numbers meaning 100 or 1000 respectively are admissible Weight factor Define influence of one measuring increments
15. e gt 150 000 During normal operation calculated lifetime for internal E2PROM is more then 41 years lt Err 4 gt Counting logics error This failure can be caused by Settings of parameter P02 to any value if NP20 is not equipped with option Q or Z auxiliary axis Break down of electronic component s lt Err 5 gt Break down of internal RAM circuit lt Err 6 gt Calculating error exceeded max arithmetic value lt Err PAr gt One or several positioning parameters have not been entered display X lt Err SOFt gt Error in the device software CAL DATA NP20 an doc edition June 2002 page 29 6 TECHNICAL DATA Power supply voltage 220 V 10 15 On request 110 V 10 15 Network frequency 48 to 52 Hz Power consumption 20 VA approx Ambient operating temperature 0 to 45 C Relative humidity 5 to 75 Protection degree 54 front plate housing IP 42 rear plate Vibrations 1 g from 10 to 150 Hz Shocks 15 g Power cable interferences symmetrical 2 5 kV asymmetrical 2 5 kV EM field 10 V m from 27 MHz to 200 MHz Electrostatic discharge 13 kV Safety class group 1 according to IEC 348 Dimensions width x height x depth 250 mm x 163 mm x 126 mm Weight cca 2 200 g NOTE Tested according to the IEC standards SQUARE WAVE MEASURING SIGNALS RS 422 A EIA standards 12 pole connector Max signal frequency 120 kHz NP20 an doc edition June 2002 page 30 NP20 an doc edition Jun
16. e 2002 page 31 7 FRONT AND REAR PLATE OPERATING ELEMENTS Front plate inch indications mm indications display DP mm inch Z 1 2 ref rel D R ref rel X NP 20 Iskra D R key REL key REF key mm inch key Numerical keyboard DP Datum point key P key ENTER key DELETE key axes keys axes reset keys axes displays axes indications D R indications REL indications REF indications Rear plate Power switch on off Fuse Power supply input RS 232 Connector X axis input conn Z axis input conn Z axis input conn RIE Connector 1 0 Clearance of at least 120 mm has to be provided for accommodating the electrical connections at rear of the device NP20 an doc edition June 2002 page 32 NOTES
17. elative mode Relative mode is indicated by rel indications on the axis status display Procedure is shown bellow PROCEDURE DISPLAY NOTE Device is set to absolute mode no axis is selected Axis indicator light steady Select the axis which you like to set in relative mode If no axis is selected settings to relative mode are valid for all axes Position display of selected axis is set to 0 000 rel indicator lights steady Setting into a relative mode Operation in relative mode Position display follow relative position Position display follow relative position based on relative origin rel indicator switch off position display shows absolute position Abandon of relative mode Position display shows absolute position based on an absolute origin In relative mode is admissible to make radius diameter toggle mm inch conversion and freeze the position display Reset or preset of position in relative mode set the NP20 in distance to go mode x z abs rel X abs rel abs rel NP20 an doc edition June 2002 page 25 5 4 DISTANCE TO GO mode Distance to go mode is purposed to simplify positioning operation on the machine tool Operator simply through specified procedure enter the wished absolute position and position display of selected axis show you distance remaining to target position When position display shows 0 000 target absolute position is reached
18. ference point in X axis NP20 an doc edition June 2002 page 15 5 MEASURING FUNCTION NP 20 can be set in different modes of operation performing the proper measuring functions or settings The conditions which cause transitions between different modes is shown in diagram bellow Selected mode in which NP 20 temporary operate is marked by indications on the display according to table bellow Indications Ref X or Z Rel Mode Calibration status Off Off Off Absolute Calibrated Off On Off Absolute Calibrated Off Off On Relative Calibrated Off On On Relative Calibrated On Off Off Absolute Non calibrated On On Off Absolute Non calibrated On Off On Relative Non calibrated On On On Relative Non calibrated Pulse On Off Reference calibration Non calibrated main axis Calibrated auxiliary axis Pulse On Pulse Reference calibration Non calibrated main axis Non calibrated auxiliary axis Pulse Off Off Reference calibration Calibrated both axes Pulse Pulse Off Reference determination Determination of reference value Absolute mode Relative mode Reference mode Calibration Determination REF P REF Print out Parameters settings and reviewing Velocity measurement P 0 P P 0 1 abs rel abs rel Switch on option B Calibration procedure finished Distance to go mode 5 4 6 2 1 3
19. ing P02 0 lt P03 Lin c gt The linear correction factor Values from 65535 to 65535 are admissible The entered value represents the coefficient in particles per million particles with which the device corrects the measured value before indicating it Xdisp Xmeas 1 P03 10 6 Xdisp displayed value compensated Xmeas measured value P03 Value of parameter 3 The zero of the correction line is set by the device in the last written position PRESET RESET absolute position entry by means of RI relative position entry by means of key REL EXAMPLE The last written position is Xp 100 00 mm P07 10000 this corresponds to 10000 particles per million particles i e 1 xd x x Xp P03 10 6 For x 0 xd 0 0 100 10000 10 6 1 00 For X 200 xd 200 200 100 10000 10 6 199 00 Usage of linear compensation is recommended for older machine with bended guideways with purpose of eliminating Abbe error for usage of angular measurement on the rotary table by means of rotary encoder with purpose to adjust required displayed resolution with encoder s line number and gear ratio of rotary table mechanism In a case if angular measurement on the appropriate axis is selected and linear compensation is different then 0 displayed value can be in the range of 360o 15o Reason for that limitation is to av
20. oid arithmetical error caused by limited number lengths lt P04 A Lin gt As P03 but it applies to the auxiliary axis lt P05 d_oF gt When the digits change too quickly the last display digits are shaded P05 0 Shading off NP20 an doc edition June 2002 page 13 P05 1 Shading on lt P06 tol gt Counting error tolerance P06 0 Counting error monitoring is off P06 1 15 Counting error value in measuring increments that causes device error indication lt Err 2 gt NOTE Counting error monitoring patented by ISKRA is active in the manual mode even when the measuring system is not calibrated by means of the reference value Every time the reference point on the measuring transducer is passed over the device measures the reference value and compares it with the reference value recorded at the previous passage over the reference point In case the values are not equal and the difference between them exceeds the tolerance P06 the device indicates the error lt Err 2 gt When this message is deleted the device also indicates the value of this difference lt P07 232c gt Define the baude rate for serial communication interface option K Possible values are 300 600 1200 2400 4800 9600 lt P08 n LF gt Define the number of empty lines which are outputs after print out a one message Possible values are 1 to 50 lt P11 Hold gt Define the function of key P11 0 Key RES will reset absolute p
21. on of the switch has to assure that it is only active for the particular reference pulse at which we want to set the reference value the transducer generates one reference pulse at each rotation The break contact of the switch is used Connector for serial interface RS 232 option K Connector contacts viewing the rear plate 1 2 3 4 5 6 7 8 9 Shield grounding RXD input data reception TXD output data transmission Not connected GND 0 V Not connected RTS output Request to send CTS input Clear to send Not connected NP20 an doc edition June 2002 page 10 4 1 ENTRY OF MACHINE PARAMETERS The device is adjusted to the machine by entering the appropriate machine parameters These values are stored in the permanent non volatile memory until the new values are entered Numbers from P1 to P79 are assigned to machine parameters and higher numbers to technological parameters Machine parameters can only be set by entering first the value 3 14 P0 3 14 for the P0 parameter This is the protection code that protects the parameters against unintentional entry or deletion This code entrance is active until the device is switched off Use the delete code P0 6 28 for deleting all parameters This is recommendable especially when the installed EPROM circuit is replaced by a new one i e by another software version The following diagram shows the procedure for calling monitoring and entering the parameters in
22. osition of appropriate axis P11 1 Key RES will freeze hold current absolute position of appropriate axis lt P15 dCr gt Define type of reference mark used on the measuring encoders for main axes P15 0 Standard reference mark P15 1 DCR reference marks lt P16 A dCr gt Define type of reference mark used on the measuring encoders for auxiliary axis P16 0 Standard reference mark P16 1 DCR reference marks RES NP20 an doc edition June 2002 page 14 4 2 ENTRY OF TECHNOLOGICAL PARAMETERS Technological parameters are entered into permanent memory in the same way as the machine parameters except that it is not necessary to enter first the protection code P0 3 14 lt P90 rEF gt Reference value for X or Z axis In the auxiliary axis the 0 value is assumed automatically Reference value represent a distance in position or angular units from of absolute zero point and reference point on the linear or rotary encoder In the case if Distance coded reference is used Reference value represent a distance in position or angular units from zero point of absolute zero and 1st reference point on the linear or rotary encoder lt P91 dP1 gt Coordinates of the datum point DP1 in the X and Z axis lt P99 dP9 gt Coordinates of the datum point DP9 in the X and Z axis x z Reference value in Z axis Absolute Zero point Reference point in Z axis Reference value in X axis Re
23. ot enter the parameter for the auxiliary axis as it automatically assumes the zero value x z x z 20 000 x z X 20 000 Z 0 000 x z REF P NP20 an doc edition June 2002 page 18 5 2 ABSOLUTE MODE Absolute mode is basic operation mode of NP 20 In this mode NP 20 display the absolute position which can be calibrated or non calibrated If NP 20 is set to any other mode of operation it will be returned to absolute mode after specified task in the other mode is performed In the absolute mode is possible to preset the absolute position reset the absolute position switch over the metric or inch measuring units switch over the radius or diameter position display in tool axis halving the measured value in longitudinal axis operate in a different datum points or preset datum points value 5 2 1 PRESET of ABSOLUTE POSITION The absolute position of the measuring system can be selected optionally by manually entering the axis position value First select the axis the axis indicators is lit then the position value the right decimal point on the axis display is flashing and then confirm the entry by pressing the key ENTER the right decimal point goes out Preset of absolute position can be done in radius or in diameter x z Z x z 10 z 10 000 Z ref R rel 0 000 Z ref R rel 5 4 6 2 1 3 0 8 7 9 x 20 20 000 X ref R rel 20 000 X ref R rel
24. page 26 5 5 AXIS SHIFT VELOCITY MEASURING MODE In axis shift velocity measuring mode position displays shows axis shift velocity The velocity is indicated in m min or in inch min depending of the selected measuring units mm or inch This mode is useful for settings of optimal and repeatable turning conditions When velocity mode is selected it is valid for both axis Abandon of this mode is done by key DELETE V 6 STATUS AND ERROR INDICATION 5 6 FAILURE DIAGNOSTICS With a purpose to assure stabile safety and accurate operation of measuring system on the machine tool NP20 device is equipped with several diagnostic functions Failure diagnostic functions in the case of any irregularity in operation of NP20 or periphery units which are connected to it linear or rotary encoders warn the operator by message on the position display s Proper procedure when warning message is displayed will avoid expenses caused by improper machining and simplify repair or maintenance operation After switch on during initialisation procedure for approx 0 5 sec all segments of light elements are switch on with purpose to recognise if some light elements is out of function lt Err tyPE gt This message is displayed if operator type a command which can t be executed or which is out of sense Example NP20 is set to axis shift velocity mode operator press the key REL message Err tyPE will be displayed and disappear after 1 second
25. versible shifting of the coordinate origin point of the measuring system in one or in both axes When datum point is selected position display will show the position described by following equation XdispDPx Xdisp0 P9x XdispDPx position display in X datum point Xdisp0 position display in absolute system P9x value of parameter P9x Datum points shift of coordinate origin can be used for processing an identical workpiece at several different working locations preselecting some points in the absolute coordinate system presetting tool offsets x z 0 1 2 3 9 x z x z 2 RES 1 1 2 3 1 2 3 9 NP20 an doc edition June 2002 page 22 The position of datum points DP1 DP9 depending on the absolute starting point is determined by setting for each axis separately the P91 P99 parameter values Datum point can be set by position preset or by datum point offset value entry in corresponded parameter The datum point DP0 has always the X 0 Z 0 value meaning that it is situated in the starting point of the absolute measuring system When the absolute coordinate starting point is shifted to some other point the datum points are also automatically shifted by keeping the same relative position depending on the starting point as they had before 5 2 7 1 DATUM POINT SELECTION The datum point is selected by pressing the key DP and the appropri
26. witch mode power supply Inductive sources of disturbance on the machine or in the environment of the device couplings relays magnetic valves etc have to be choked by parallel connecting corresponding standard choking elements diodes zener diodes RC elements for the DC power supplied elements and RC elements for the AC power supplied elements M gt 200mm gt 100mm gt 100mm Recommended value for protection elements V R C D lt 60 dc 1N4004 125 V dc 220E 5W 2 uF 600V 250 V dc 220E 5W 0 5uF 1000V 115 V ac 220E 1W 0 5 uF 600V 230 V ac 220E 5W 0 5 uF 1000V 440 V ac 220E 5W 0 5 uF 2000V DC relays Relays and AC motors Switches R C R C R M 3 S T lt 1 5mm2 by shortest way to machine ground point NP20 an doc edition June 2002 page 9 3 3 CONNECTORS Axes Connectors for square wave encoders Connector contacts viewing the rear plate A B C D E F G H J K L M Shield grounding GND 0 V Signal A Signal A_ Signal B Not connected Signal RI Signal RI_ Not connected 5 V Signal B_ Not connected Connector for RIE switches option R Connector contacts viewing the rear plate 1 2 3 4 5 6 7 8 9 RIEx RIEz RIEz Not connected 5 V Input RIEz auxilliary axis Input RIEz Not connected Not connected NOTE The RIE switches are only required when rotary measuring transducers are used The installati
27. ws selected units After switch on of the NP20 position will be displayed in units which was active before switch off 5 2 4 RADIUS DIAMETER SWITCHING OVER Position of tool axis Xaxis can be displayed in Radius or Diameter After switch on NP 20 display position of tool axis X in diameter by pressure to key R D position display will be toggle to radius Selected display mode is indicated on R D status indicator 5 2 5 HALVE OF MEASURED VALUE IN Z AXIS Halve of measured value in Z axis is purposed to simply find the middle point between two points along the Z axis Halve function is activated only if Z axis is selected by key R D x z 20 R D x z 10 20 000 X ref R rel inch mm x z 20 x z x z x z R D R D x z 10 000 X ref R rel 20 000 Z ref 1 2 rel 0 000 Z ref 1 2 rel 10 000 Z ref 1 2 rel 10 000 Z ref 1 2 rel 20 20 20 20 000 X ref R rel 0 7874 X ref R rel 20 NP20 an doc edition June 2002 page 21 5 2 6 FREEZE OF ABSOLUTE POSITION If the parameter P11 is set to 1 see chapter 4 1 the pressure to key will cause freeze of current position on the display Freeze of proper axis is indicated by pulsating of proper axis designator on axis status display In the back position is followed and following pressure to key RES will release position display 5 2 7 DATUM POINTS DP0 DP9 Datum points are used for re
28. yped digit pulsate On numerical keyboard type the required new absolute position New position is displayed Confirmation of new DP 1 position The previous offset of DP 1 is lost The new datum point offset is calculated and entered in P91 parameter No number on the axis display Deleting of typed numbers due to typing failure or other reason Old absolute position Abandon of absolute position preset Old absolute position is maintained Device is set to absolute mode datum point 1 X axis is selected 5 2 7 3 DATUM POINTS SETTING BY MANUAL PARAMETER ENTRY The entry is similar as for the other parameters Item 4 1 x z 10 5 4 6 2 1 3 0 8 7 9 20 0 000 Z ref R rel 0 000 X ref R rel 1 mm r R inch 0 000 Z ref R rel 20 000 X ref R rel 1 mm r R inch x z 10 20 1 X 1 X 5 4 6 2 1 3 0 8 7 9 NP20 an doc edition June 2002 page 24 5 3 RELATIVE MODE The relative mode is useful when machining parts according to drawings where measures are made in relative manner sketch bellow Absolute position in relative mode is not lost only displayed position when entrance in relative mode is 0 000 Abandon of relative mode will set NP20 in to a absolute mode and position according to old absolute coordinate system will be displayed Pressing to key abs rel does toggle from absolute mode to r
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