Operating Instructions VRZ 740,780 Bidirectional
Contents
1. enter dimension for borehole Ill A key still functional X 10 05 20 1 mm appears in position display deviation from nominal position position machine by target counting drill borehole III press A key once again indicator of A key extinguished the deviation from the datum point JE appears in the position display 10 05 mm for checking purposes only by pressing the datum point key 1 or 2 the corresponding absolute dimension referenced to the datum points is displayed e g for datum point Jun referenced to borehole III X 160 40 mm Y 125 00 mm 19 7 Control panel 0 001 mm 00005 inch mm cred ey inch 0 002 mm 0001 inch new Nig le le z d P EIDENHAIN 2 REF key with indicator lary Selector switch for counting direction and pulse evaluation Mains fuse Mains switch ON OFF 20 DR JOHANNES HEIDENHAIN GmbH D 8225 Traunreut Telephone 0 86 69 31 1 Telex 05 6831 aed DR JOHANNES HEIDENHAIN 21393501 e 10 9 81 E Printed in West Germany Rights of alteration reserved2. all datum points can be reproduced by simply passing over the reference marks once Delta key conversion of entered absolute dimensions into incremental dimensions target positioning Tool radius compensation keys for entry and addition to value in keyboard display or subtraction from value in keyboard display stored independently of power supply Dimmer switch adjustment of display brightness CD 1 3 Dimensions mm VRZ 740 2 axes eo l ao HEY 00e oJ ED F3 EA inch Soin semenan kD VRZ 780 3 axes x 345590 ee ooog YE 2345604 FAEN BOO Z if 345 5460 ee 2 J 2 ime eo UE EE C C e Le Ent Son LE LL Li M5 133 01 view A 2 Mounting possibilities The counter is cased in a cast aluminium housing The feet of the unit are provided with M5 tapped holes which enable securing onto tables or consoles from underneath by means of screws see drawing of dimensions A further mounting possibility is provided by securing the counter rear onto an angle iron or pipe Drill and tap required holes in accordance with dimensions as indicated in drawing of rear panel at any location Within the shaded areas If the indicated dimensions are not strictly obser
3. decade of the key board display is rounded off to digital step 0 002 mminoperating mode metric 2 um and to 0 00005 inchin imperial operating mode 0 00005 An entry value can be preset into the position displays 49 or can be repeated any number of times as an incremental dimension in any axis and with changing sign see item 2 2 Only negative sign is displayed Each actuation of the sign change key will change the sign of the value in the keyboard memory For entry of negative values the following is applicable first enter value then negative sign If the entered value in the keyboard display is too large gt 5079 999 mm or 199 99995 inches then each numeral in the keyboard display will illuminate with decimal point wou 1 3 Traversing over reference marks when first setting up After initial connection of transducers all REF memories of the counter must be activated iu REF press REF key 43 reference mark indicators 4 in the position displays illuminate Traverse over reference marks in all axes reference markindicators are extinguished 1 4 Failure signal Failure of a transducer cable defects etc are indicated by flashing of the appropriate position display 48 Switch off counter remedy the fault and re active counter Alternatively the failure signal can be cancelled by pressing the REF key repeat if reqd 15 Operating condition each time counter is switched
4. Operating Instructions VRZ 740 780 Bidirectional Counters DR JOHANNES HEIDENHAIN Precision Mechanics Optics and Electronics Precision Graduations eee Post Box 1260 D 8225 Traunreut Telephone 08669 31 1 Telex 056831 Telegramme DIADUR Traunreut Issue 9 81 Setting up and maintenance 1 1 Items of delivery Bidirectional counter VRZ 740 for 2 axes or Bidirectional counter VRZ 780 for 3 axes Replacement fuse 0 4 A slow blow in small compartment at rear of counter Mains coupling separate optional mains cable 2 7 m long Operating instructions and certificate of inspection 1 2 Type VRZ 740 2 axes display Technical specifications l VRZ780 3 axes display Mechanical data Housing design table model cast housing Dimensions W 270 x H 221 x D 172 mm Weight approx 5 6 kg Operating temperature 0 to 45 C Storage temperature 30 to 70 C Electrical data Inputs i for Heidenhain transducers with grating pitch 20 um Scanning frequency 25 kHz max Cable length max 20 m Digital displays position value displays 7 segment LED s keyboard display 71 2 decades with sign Metric Inch converter static active for all displays Display step 1 um 2 um or 0 00005 or 0 0001 selectable i Datum points 4 floating datum points Reference mark evaluation The reference mark positions for all datum points are automatically stored indep ndent of power supply After power failure
5. de of positioning is more convenient and safer than traversing to a nominal value Even with inexact positioning value other than zero in the position display errors in this operating mode will not be accumulative as the deviation is automatically taken into account with the next positioning step in this axis When entering the nominal dimension e g 120 mm the position display shows the deviation from the nominal value 70 mm in order to position the nominal value machine must be traversed in direction Position display L gt F lt X 50 00 0 00 X 0 00 0 00 pe e tary reached nominal position Keyboard display e g 50 0 in position display actual position referenced to datum point 1 by pressing the A key 4 the value in the position display is set to 0 key in of nominal value X 120 0 by pressing the axis key the deviation from the nominal value appears in the position display X 119 95 be a G 4 Tool radius compensation 7 With the three keys the tool radius can be taken into account without calculations during positioning For example key in milling cutter diameter by pressing the key the milling cutter radius is stored position machine with target counting 0 is not exactly reached difference of 0 05 mm with regard to nominal value 120 0 120 0 120 0 The value remains in memo
6. dius compensation Face Cis to be milled and boreholes II Ill drilled in main and auxiliary dimensioning on a workpiece s 18 Example mm borehole zero datum workpiece zero datum 2 100 machine datum 100 160 40 see ee table page 19 milling cutter diameter 9 98 entered milling cutter radius stored R 4 99 position datum point 4 machine datum and preset in X and Y axis position machine X and Y axis until X 0 and Y 0 appears in position display press datum point key 2 preset datum point 2 O in Xand Y axis press A key enter value X 70 mm add milling cutter radius press X key Deviation from nominal value 74 99 appears in position display position machine by target counting mill face C remove milling tool and insert appropriate drill enter distance X 50 35 for borehole A key still functional press X key Deviation from nominal value 24 64 mm appears in position display enter distance value Y 25 00 for borehole A key still functional press Y key Deviation from nominal position appears in position display position machine in X and Y axis by target counting drill borehole press datum point key 13 enter dimension for borehole il X 10 05 A key still functional position machine in X axis by target counting drill borehole II
7. ine towards zero HER position machine towards zero 4 LU When the next workpiece is placed into the jig then the 4 boreholes can be directly positioned by call up of the various datum points press clear key and axes keys press delta key enter distance values to first borehole address datum point 2 press clear key and axis key address datum point 1_ once again press A key enter dimension X 65 mm preset datum point 1 X 30 Y 15 appears in position display datum point 2 preset boreholes are dimensioned from datum point 1 deviation from nominal value 35 mm appears in position display enter dimension Y 35 mm select reached position as datum point 3 press clear key and axis keys address datum point qt once again press A key enter dimension X 30 mm enter dimension X 15 mm switch off A key The same example is applicable to inner contour milling with target counting however ensure that tool radius is taken into account deviation from nominal value 20 mm appears in position display datum point 3_ preset X 35 mm appears in position display Y 20 mm appears in position display drill is positioned on first borehole X 30 Y 15 i e deviation from datum point 1_ appears for checking only or X 0 Y 0 with datum point 2 7 6 2 2 Example for several datum points and tool ra
8. irection can be altered for each axis individually by shifting the counting direction switch 1 2 or 3 beneath the cover at rear of counter 3 6 Pulse evaluation The pulse evaluation may be altered for ail axes simultaneously at switch 4 of the counting direction selector from the standard 4 fold evaluation to 2 fold This setting permits connection of linear transducers with 10 wm grating pitch to the counter Transducer label Traversing direction of scale unit for positive increasing values Traversing direction of Scanning unit for positive increasing values Pulse evaluation 2 fold 4 fold Counting direction positive negative Axis _ __ X YZ X Y forVRZ 740 Pulse evaluation 2 fold 4 fold Counting direction positive negative Axis _ _ X YZ X Y for VRZ 740 ll Working with VRZ 740 780 By deciding upon counter VRZ 740 780 you have purchased a unit which due to the practical design makes positioning easier quicker and more economical This counter offers the possibility of setting several datum points Furthermore it is possible to position with target counting whereby the tool radius can be simultaneously taken into account Re establishing the correlation between datum points and reference marks of the LS system is automated Traversing over the reference marks once is sufficient t
9. isplayed In order to reproduce the datum point simply press the REF key and traverse over reference marks in all axes displays are activated and show the position values with reference to the selected datum point ee ae This procedure is explained in detail as follows 12 or 0 press clear button 4 or zero press axis keys 4 position value for workpiece datum point reference value entered 2 press appropriate axis Y For incremental dimensions two procedu res are possible either traverse to required dimension by assigning value zero to the starting position or preset the nominal value and position with target counting to zero keyboard display 8 shows 0 0 appears in position display 9 datum value appears in keyboard display 4 datum value appears in position display 2 31 Calibration reproduction of datum points after operational interruption or power failure a selected counting mode prior to interruption mm X 0000000 display immediately after counter switch on X 67 070 display value approx 1 5 sec after switch on of counter dimension 67 07 position value of X reference mark for datum point 1 SBE X 67 070 if REF key is pressed the REF indicators in the position display illuminate counting function ceases machine traverse over reference mark of X transducer REF indicator is extinguished and counting i
10. le mm Ca a datum point 11 22 Preset Presetting assigns fixed display values to all positions Zero is often selected as datum point datum point 1 4 The counter can be preset to any datum values as follows If machine axes are now traversed then VRZ 740 780 always indicates the actual position with reference to the selected datum point For presetting a determined absolute position value absolute nominal position traverse individual machine axes such that the pre determined position value appears in the position displays 8 datum point 1 4 2 3 Reference mark evaluation REF In the case of switch off of VRZ 740 780 or power failures the established correla tion between positions and display values is lost If the momentary position is known e g from the drawing then the position values can be directly re entered in accordance with item 2 2 If this is not the case then the datum points which were established last can be reproduced by means of the REF key Immediately upon counter switch on all digits of the position displays will show zero the position displays 48 will then jump to those position values which had been assigned to the transducer reference marks by establishing the datum point prior to the operational interruption When switching to 2 g 43 or 4 the reference mark position values with regard to these datum points will be d
11. nected Please observe that the scanning signals are then interpolated electronically 20 fold or 10 fold after modification of the pulse evaluation within the counter The transducer is connected via a 9 pole flange socket Heidenhain Ident No 20071901 Connector 21235601 contact designation measuring signal signal 90 el lea 0 el let input signals electrical values 5V 5 approx 120mA shaping electronics internal shield to pin 9 external shield to connector housing measuring for Heidenhain linear transducers and angle encoders without built in pulse reference mark signal leo 3 3 After removing mains fuse holder Selection of mains voltage set voltage selector to desired voltage by The counters are set to 220 V when using a coin replace mains fuse holder supplied and can be converted to 100 120 140 200 or 240 V Mains voltage selection Exchanging mains fuse 3 4 accessory and insert mains coupling into Mains connection mains socket of counter Push down Wire mains cable to enclosed mains safety clamp coupling compl mains cable available as Wiring of Mains Coupling CAUTION Mains connection to contacts 22 33 Protective earth to 3 5 Counting direction The transducers are supplied as follows The counting d
12. o calibrate the counter in all axes Previous determination of the position value for the datum point is not required In addition to these advantages the counters are provided with keyboard entry keyboard display selectable display step mm inch converter dimmer direction switch and pulse evaluation selector When reading the following explanations it is recommended to refer to the illustration of the operating panel on page 20 The encircled figures 0 of a3 axes counter are explained in this illustration 10 1 1 Absolute mode and incremental mode In the absolute mode all measurements refer to the absolute datum point whilst in incremental mode each immediately preceding position serves as datum point Absolute mode Example The left upper corner is the absolute datum point for the measurements yaa The machine is to be positioned to a certain dimension Incremental mode Example Measurements are carried out starting from the left upper corner in increments The machine is to be traversed by a certain distance 1 2 Instructions for key in of position values or dimensions Entry errors can be cleared by means of the Values are entered in mm or inch whereby key in of trailing zeroes is not required An entered value remains within the keyboard memory until it is overwritten by a new value or cleared with the button The finest
13. on inch 0 001 mm 0 00005 inch RALA R B 0 002 mm 0 0001 inch Displayed position values indicate correlation between established datum point 41 and reference mark metric or Imperial depending on last mode Random switch over from mm to inch and vice versa during measuring procedure whereby the displayed values and all stored values are simultaneously converted With the display step button 9 either 0 001 mm or 0 002 mm or 0 00005 inch or 0 0001 inch can be selected as display step for the position display Keyboard display a 0 Position display ri REF key OFF mm inch button D chosen Display step Display brightness maximum brightness dimmer switch 42 for two brightness settings 2 Establishing datum point 2 1 Selection of datum point The counter permits establishing of four floating datum points for the position displays The dimensioning of a workpiece may be referenced to different datum points i e in the following example datum point 1_ can be referenced to the workpiece edge as starting point and the other datum points can be referenced to the centering points of the bore holes for positioning of the incremental dimensions Prior to setting a datum point one of the datum point keys 6 to is to be pressed the corresponding indicator lamp illuminates Switch over between datum points is possible at any time Examp
14. raverse to target 0 when switching off the A key the absolute dimension referenced to datum point 1 appears in the position display 15 5 Setting lines of symmetry The three keys can also be utilized for axially symmetrical hole arrangements bore hole 2 bore hole 1 store symmetry dimension 25 30 12 650 symmetry dimension 2 appears in keyboard display 0 appears in position display enter 26 25 and then press 13 600 appears in keyboard A ES display 2 X 13 600 appears in position and axis key display 38 900 deviation from nominal value press twice appears in keyboard display after pressing axis key 25 300 press axis key appears in the position display position machine by target counting for borehole 2 and drill second hole 16 6 Operating examples 6 1 1 Example Working with several datum points Several identical workpieces are to be machined with 4 boreholes If the appropriate values are referenced to the datum points during machining of the first workpiece then a program has been stored i e all further identical parts can be positioned by calling up the individual datum points without re entering of dimensions or re checking drawing et 3 lo x 5 Y position machine towards zero cE Be x LY a 6 5 x Nu position machine towards zero position machine towards zero position mach
15. ry until a new diameter is entered even after switch off of the counter If working only with one milling cutter in an operation it is recommended to store the milling cutter radius prior to starting when A key is switched off then the absolute dimension referenced to datum point y will appear in position display value sto NID enter diameter diameter value appears in keyboard display E milling cutter radius is stored and appears in keyboard display 8 When working with several milling cutters the appropriate radius is to be entered after each tool change After pressing the key the milling cutter radius is added to the value in the keyboard display 48 or subtracted by pressing key 14 Pressing twice will result in addition or subtraction of the total diameter After compensation the value is transferred or preset by pressing the appropriate axis key as usual In conjunction with the A key positioning is simply carried out with target counting to zero also see example on page 18 s 7 5 position display X 0 00 5 125 X 0 00 25 75 X 0 00 X 0 00 X 20 625 enter milling cutter diameter milling cutter radius is stored datum point J1 addressed press A key key in drawing dimension into keyboard display subtract milling cutter radius transfer dimension to be traversed into position display t
16. s resumed The displayed position value corresponds to the X machine position for the selected datum point p counter is calibrated in X axis X 0000000 amp display immediately after counter switch on X 2 64065 display value approx 1 5 sec after counter switch on dimension 2 64065 position value X reference mark for datum point X 2 64065 38 if REF key is pressed the REF indicators in the position displays illuminate counting function ceases X 67 070 67 071 67 072 b selected counting mode prior to interruption inch machine traverse over reference mark of X transducer REF indicator is extinguished and counting is resumed The displayed position value corresponds to the X machine position for the selected datum point qu the counter is calibrated in X axis X 2 64065 2 64070 2 64175 REF remains activated illumination of the REF lamp indicates that the REF values position values relative to the reference mark are automatically stored when a datum point is established and thus are available for re establishing this datum point after power interruptions If the reference marks are inaccessible e g workpiece and milling tool are clamped and reference mark cannot be traversed over REF should be switched off 13 3 Positioning with target counting In conjunction with the A key absolute dimensions can be positioned through target counting This mo
17. ved then 110 5 60 TAN NZ view this might result in penetration of the housing and swarf entering the counter interior may cause malfunctions sectional view B B 10 5 0 5 The Lo 2 D 3 Connect transducers mains connection CAUTION Do not engage or disengage any connectors whilst equipment is under power 3 1 Protection The front panels and the operating panel of the counters are splashwater proof The counters are provided with failure signal see page 10 Counters VRZ 740 780 correspond to protection classification of the VDE regulations VDE 0411 and are built and tested in accordance with DIN 57411 part 1 VDE 0411 part 1 Protective measures for electronic measuring equipment In order to maintain this condition and to ensure safe operation the operator must comply with the instructions and warnings which are contained in these operating instructions 3 2 Connection of transducers VRZ 740 780 All HEIDENHAIN linear transducers with 20 um grating pitch can be connected to VRZ 740 780 If the standard 4 fold pulse evaluation is modified to 2 fold see 3 6 page 9 linear transducers with 10 um grating pitch may also be used Angle encoders ROD without built in pulse shaping electronics e g ROD 450 can also be con
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