! Inductive Encoders comparable to Optical Angle Encoders in both Accuracy and Resolution (Arc Seconds Range) ! High Speeds up to 120,000 RPM

Transcription

1 AMO Automatisierung Messtechnik Optik GmbH ANGLE MEASURING SYSTEMS based on the AMOSIN - Inductive Measuring Principle! Inductive Encoders comparable to Optical Angle Encoders in both Accuracy and Resolution (Arc Seconds Range)! High Speeds up to 120,000 RPM! No Magnetic Components No Magnetic Field Hysteresis or Demagnetisation Risk! Protection Class IP 67 Fluid Submersible Encoders

2 AMOSIN - general information AMO's proven and original technology for length and angle measurements uses techniques for scanning high precision graduations consisting of structures photo-lithographically etched onto steel. Based on this, inductive sensors and integrated evaluation electronics (in ASIC) have been developed further, to create a new and powerful generation of measuring systems. The AMOSIN angle measuring systems are open hollow-shaft measuring systems, and generally therefore do not have their own bearings, nor do they require any couplings for mechanical connection. Operating entirely on an inductive basis, the AMOSIN systems achieve high precision figures as close as +/- 5 µm arc length, but are nevertheless very well able to resist environmental influences such as dust, humidity and so forth, and also feature extremely high resistance to shock and vibration. The high precision is mainly due to the procedure used to manufacture the rigid steel measuring ring, and to the exceptionally high quality sensor signal, with deviations in the sine wave down to < 0.1 % harmonic content, as a measure of the achievable interpolation precision within the grating pitch. As will be seen from the measuring principle described below, the measuring system does not include any magnetic parts (either in the scale or in the scanning head). As a result it is not at all sensitive to electromagnetic interference of any kind and has no hysteresis in contrast to magnetic measuring systems. The systems output interfaces either 1 Vpp sine/cosine signals, or RS-422 square wave signals, in real-time. The wide range of available AMOSIN angle measuring system types means that they can be used for large applicationfields from the slow, extremely precise positioning of a turntable through to the high speeds and the closely controlled velocities of a machine spindle. They are of value in general for drives where high dynamic range and stiffness is required. General properties Not sensitive to soiling / IP 67 Not sensitive to interfering magnetic fields High precision and resolution High speeds Self-centring scanning unit Integrated reference pulse, also distance coded Properties - the new generation Analog output signals (1 Vpp) can also be delivered, with a reduced signal period, down to arc lengths of less than 40 µm (the basic period of 1000 µm can be divided by a factor of up to 32) Digital output RS-422 / with decimal resolution (in arc lengths): 0.25 µm (1000 µm/4000) and 1µm (1000 µm/1000) Input frequency (speed of rotation) for analog and digital outputs significantly increased (analog up to 46,000 rpm). Introduction of the product group with a grating pitch of 3000 µm for very large assembly tolerances and rotation speeds above 100,000 rpm. The standard working temperature range has been enlarged to 0-70 C. Dependency of the precision of the system on the operating temperature has been significantly reduced. Scanning head clearance (air gap between the scanning head and the measuring flange) and its tolerance have been increased. The effects of mounting deviations within the specified tolerances on the precision of the system have been greatly reduced. Miniaturisation of the evaluation electronics, which has permitted integration of this circuitry into the connector housing. Typical applications Turntables Swivelling axes C-axes Working spindles Direct drives Medical equipment Printing machines Roller positioning Punching machines Electronic production equipment 2

3 AMOSIN - the measuring principle Primary windings The AMOSIN measuring systems function on the principle of a transformer with a moving reluctance core. The mutual inductance of the primary and secondary windings of a transformer changes in accordance with the relative position of the core. The AMOSIN system consists primarily of a planar coil and a Measuring scale (Fig.1). The coil structure, with a number of winding elements (individual main elements with primary and secondary SIN/COS coils) aligned in the direction of measurement, is implemented on a substrate using micro-multi-layer technology. The measuring scale is a stainless-steel ring onto which a highly precise graduations (e.g. = 1000 µm) of variable reluctance has been etched using photo-lithographic techniques. SIN COS SIN COS Secondary windings AMOSIN - MEASURING PRINCIPLE (Fig. 1) Sensor substrate Measuring scale Micro-coil structure The relative angular movement in the direction of measurement between the sensor structure (in the scanning head) and the Measuring scale(measuring flange) periodically changes the mutual inductance of the individual coils, generating two sinusoidal signals with a 90 phase difference (SIN and COS). The extremely accurate signal, and its immunity to environmental influences, has the effect that, after conditioning of the signal in the evaluation electronics (Fig. 2), deviations of no more than 0.1% from the ideal sinusoidal form (harmonic content) remains. This allows high interpolation factors (further levels of sub-dividing ) to be car ried out in the course of signal digitisation. This can either be done in the measuring system itself, or in the subsequent electronics (CNC etc.). EEPROM configuration data Power supply unit ASIC signal conditioning + evaluation Compensation signals Analog output ~ 1 Vpp Encoder output RS 422 An important feature of the principle of operation is that using the AMOSIN procedure does not give rise to any measurement hysteresis (machine backlash error). In contrast to magnetic systems, the high-frequency alternating field suppresses any hysteresis in the material. The evaluation electronics conditions the sensor signals and interpolates them continuously, without using strobe times, exploiting a novel circuit principle. It then supplies the measurement information at the output through differential interfaces and linedrivers, either as a sinusoidal signal or as a square wave signal. (See the signal diagram on Page 26) Measuring scale Sensor unit Electronic evaluation stage AMOSIN MEASURING SYSTEM (Fig. 2) In addition to the periodic quadrature signals (A, B and their inverted) a reference signal is output for the determination of absolute position. This signal is generated from individual marks integrated into the measuring ring, and does not require any additional parts. (See the description of the reference signal on Page 26.) 3

4 Measuring accuracy As an open angle-measuring system, in which the system components, Measuring scale and scanning head possibly also the evaluation electronics) are supplied separately, and in which there is no mechanical connection requireing own bearings, the precision can be assigned to these components as follows: 1. Scale accuracy - determined by the precision of the Measuring scale on the measuring flange, and by deviations of the measuring flange mechanics from an ideal cylindrical form 2. Precision within one grating pitch - primarily determined in the scanning head, depending on the quality of the sensor signal and its evaluation electronics. The following should also be considered for the measuring systems with a 1 Vpp output interface: 3. Precision of the analog/digital conversion at the input stage of the subsequent electronics (in the controller) 4. Noise coupled into the output signals as it is transferred from the scanning head to the subsequent electronics A detailed description of these aspects follows: 1. Scale accuracy Every measuring flange is measured on an angle test bench, and a test certificate, quoting the precision class in accordance with specification, is completed. Although the absolute angular deviation for an open measuring system depends on the precision with which the measuring flange is centred on the axes being measured, it is to possible supply a measuring diagram (registered under ideal assembly conditions), as follows. Abweichung ["] Error ["] Winkel [Grad] Angle [Degree] For applications requiring the greatest precision, the measuring flange should be centred as accurately as possible. The precision of the angular measurement depends on the graduation error and on the concentricity of the assembly. Systematic (long-wave) errors resulting from this can be compensated for in the controller. In a special available system configuration two diametrically opposed measuring heads can be used scanning one flange in order to suppress eccentricity errors through the averaging of the angle information in a dedicated electronic box. 2. Precision within the grating pitch The deviations from the ideal sinus wave of the signal, apeared in the generation and evaluation of the primar measuring information, are mainly periodical and as already mentioned for the AMOSIN -System within 1 µm arclength (1/1000 of the pitch of 1000 µm). This high accuracy level is achieves not just for the ideal, nominal mounting and environmental conditions but for the whole specificated functional range of geometrical mounting deviations or tenperature. In order to suppress the errors discussed above under points "3" and "4", a new output interface has been implemented in the new generation of AMOSIN systems, in which the sine, cosine and reference signals, for the 1 Vpp output interface delivered over line drivers (see signal diagram on Page 26). The real time covertion of the original signal (e.g µm) in finer sine wave periods down to less than 40 µm. arc length is realised over a programmable factor "D". The effect of any possible deviation in the evaluation (A/D conversion) in the subsequent electronics (controller etc.), is reduced in this signal interface by exactly the dividing factor (D) that is applied. In addition, this reduced sinusoidal signal period leads to finer quantisation in the subsequent electronics, which is of particularly great impor tance to demanding high stability, high stiffness drive applications. Additionally, the signal dividing reduces the effect of interfered noise on the signal transfer line in proportion to the dividing factor "D"; in other words, an improved signal/noise ratio is achieved. The metrological principle on which the AMOSIN systems operate means that they are entirely free from hysteresis and don t lead to a "backlash effect". 4

5 Measuring system configuration A special manufacturing technology is used to fabricate the scale in the form of a closed measuring ring. This, in turn, is related in two variants as rigidly welded to a WMF-type measuring flange, or direct as a thin WMR-type measuring ring, for assembly by the customer. Implementing the new measuring scale WMR as a thin, closed ring for the measurement of angles or rotation speeds offers high flexibility to drive design. Fitting the measuring ring in the transmission chain turns an existing part of the machine into a measuring flange. Other advantages of the measuring ring design:! Extremely low inertia! The part of the spindle onto which the measuring ring is fitted can consist of any material! High rotation speeds can be achieved due to the extremely stable structure of the ring The design of the sensor unit (Fig. 3) is unique to the AMOSIN angle measuring systems. The planar coil structure, consisting of a number of coil elements, is applied to a flexible substrate, so that its radius can therefore be adapted to any required diameter of (measuring flange). With this arrangement, it is ideally possible to average the signal over several grating pitches. A plane scanning surface, such as a glass plate or a rigid silicon substrate, incorporating individual sensitive elements, can only approximate to this, and is therefore less suitable for scanning a cylindrically arranged scale. Scanning head Measuring flange AMOSIN ANGLE MEASURING SYSTEM (Fig. 3) Electronic evaluation stage Sensor planar coil structure on radius Measuring track Reference track Metal cover Measuring ring These angle measuring systems are used wherever precision is required under difficult environmental conditions (e.g. oil, dust, coolant and so forth - protection class IP 67). A speciality of these measuring systems is the ease with which it can be integrated into customers existing mechanics, regardless of whether the mechanical parts are supplied to us for integration of the measuring ring, or whether AMO manufactures the special mechanical parts, incorporating the scale body, in accordance with customers' drawings. The design of the measuring system based on the basic components: the scale body, sensor and the evaluation electronics is very flexible, and can be adapted to the special requirements of any particular application. The main selection criteria are given further (see also selection table page 6): 1. Grating pitch: 2. Type of scanning: 3. Measuring scale: 4. Scanning head: - = 1000 µm for maximum precision - = 3000 µm for larger assembly tolerances Scanning head relative to scale body: - outside scanning - inside scanning - measuring flange - measuring ring - miniature version with electronics in connector - fully integrated electronics Generally speaking, any type of Measuring scale can be combined with any scanning head version, provided the following properties for the two components match:!!! Grating pitch Type of scanning Number of grating pitches per circumference 5

6 Selection table Grating pitch = 1000 µm = 3000 µm TYPE OF SCANNING Outside scanning Inside scanning Scale Scannning head Scale Scannning head Measuring flange Measuring ring Miniature Integrated electronics Measuring flange Measuring ring Miniature Integrated electronics WMF-100 Page 07 WMR-100 Page 08 WMK-100 Page 12 WMK-200 Page 15 by request WMR-110 Page 09 WMK-110 Page 18 WMK-210 Page 20 by request WMR-300 Page 10 - WMK-300 Page 22 by request WMR-310 Page 11 - WMK-310 Page 24 Measuring scale In accordance with the selection table above, the measuring system is implemented in two versions with grating pitches of = 1000 µm and = 3000 µm 1. Measuring scale with grating pitch = 1000 µm and outside scanning The WMK-100 and WMK-200 product families (pages 12 and 15) are the suitable scanning head implementations for these measuring scales. WMF-10 measuring flange Stable, independent precision mechanics made of stainless steel. The graduation and the protection tape are welded to the carrier flange. Reference mark: once in 360 is standard; any other desired number and position is possible, or they may be distance coded (see the description of reference marks on page 26). Standard measuring flanges : Type Scale accuracy* WMF A (mm) I (mm) B (mm) WMF-100 WMF , x ** ** ** ** ,07 163,54 163,54 229,78 229,78 287,08 287,08 326,55 326, x 60 6 x 60 6 x x x 30 ± 50" ± 36" ± 24" ± 18" ± 14" ± 12" ± 25" ± 18" ± 12" ± 9" ± 7" ± 6" * ** Higher precision by request. The precision of measurement is increased by a factor of 2 in the measuring system implementation that uses double diametric scanning (2 scanning heads). More informations on the "Multi Head Solution MHS can be found on the or own data sheets. Only for press-fit assembly on the customer's shaft (recommended shaft tolerance ) The application specific Measuring flange (type WMB) can, by request, be mounted on mechanical parts (steel) supplied by the customer. Ask for the drawing with the WMB production recommendation. 6

7 Ordering code: WMF Grating pitches/revolution (N) XXXX... customer-specific Precision of the scale division 0... standard (±10 µm arc length) 1... increased (±5 µm arc length) Reference pulse none RI / revolution K1... distance-coded, basic spacing 40 mm arc length K2... distance-coded, basic spacing 60 mm arc length K3... distance-coded, basic spacing 64 mm arc length K4... distance-coded, basic spacing 80 mm arc length K5... distance-coded, basic spacing 120 mm arc length Internal diameter (according to drawing in brochure) 0... small 1... large 9... special version (requires special no. Sxx) 7

8 WMR-10 measuring ring Thin, stainless-steel measuring ring, consisting of a steel carrier ring, a graduation ring and a protection ring. Easily pressfitted mounting to the corresponding flange by the customer. For special applications, in agreement with a producer, the measuring ring (circular segment also possible) can be mounted on a flange at the factory.! Accuracy of the graduation is offered in two classes: +/- 10 µm arc length - WMR /- 05 µm arc length - WMR-101 (Higher accuracy by request).! Reference mark: once in 360 is standard, or any desired number and position, or distance coded (see page 26). Assembly drawing:! Width 10 mm! Coefficient of expansion: ~11ppm! Flange material: no special material is required! ØF: diameter of the flange without the measuring ring! ØS: diameter of the stop collar Standard program measuring rings: WMR , 0360, 0512, 0720, 0900, 1024, 1440, 2048 Further sizes can be made by request. * Recommended concentricity Greater eccentricities of up to ~0.05 mm do not affect the function of the device, but do cause a proportionate deterioration in the accuracy of positioning. N: integral number of grating pitches per revolution (1 pitch = 1 mm arc length) N= 256 to 511 N= 512 to 719 N= 720 to 1024 N= 1025 to 1500 N= 1501 to 2000 N= 2001 to 3000 N= 3001 to 4000 ØF = N/ ±0.01 [mm] ØF = N/ ±0.02 [mm] ØF = N/ ±0.02 [mm] ØF = N/ ±0.03 [mm] ØF = N/ ±0.06 [mm] ØF = N/ ±0.07 [mm] ØF = N/ ±0.10 [mm] The AMO release can be referred to for the production drawings of the carrier flange. For large diameter applications with significant temperature variations during operation, and where carrier flanges are not of steel, such as of aluminium, the system must be designed accordingly. Ordering code: WMR Grating accuracy /- 10 µm arc length /- 05 µm arc length Grating pitches/revolution (N) RI position none RI / revolution Kx... distance-coded by request 8

9 2. Measuring scale with grating pitch =1000µm for inside scanning The WMK-110 and WMK-210 product families (pages 18 and 20) are the suitable scanning head implementations for this measuring ring. WMR-11 measuring ring Thin, stainless-steel measuring ring, consisting of a steel carrier ring and a graduation ring. Designed to be mounted over a "snap-effect" by the customer into a corresponding groove or against a stop collar. Recommendations for assembly dimensions are given further below. For special applications, in agreement with a producer, the measuring ring (circular segment also possible) can be mounted on a flange at the factory.! Accuracy of the graduation is offered in two classes: +/- 10 µm arc length - WMR /- 05 µm arc length - WMR-111 (Higher accuracy by request).! Reference mark: once in 360 is standard, or any desired number and position, or distance coded (see page 26). Assembly drawing:! Coefficient of expansion: ~11ppm! Flange material: no special material is required! ØF: diameter of the flange without the measuring ring! ØS: diameter of the stop collar * Recommended concentricity Greater eccentricities of up to ~0.05 mm do not affect the function of the device, but do cause a proportionate deterioration in the accuracy of positioning. Standard program measuring rings: WMR , 0720, 0900, 1024, 1440, 2048 Further sizes can be made by request. N: integral number of grating pitches per revolution (1 pitch = 1 mm arc length) N= 512 to 720 *) N= 721 to 1024 *) N= 1025 to 1500 N= 1501 to 2500 N= 2501 to 4000 N= 4001 to 5500 *)... Assembly only with one stop collar ØB = N/ ±0.01 [mm] ØB = N/ ±0.02 [mm] ØB = N/ ±0.03 [mm] ØB = N/ ±0.05 [mm] ØB = N/ ±0.07 [mm] ØB = N/ ±0.10 [mm] The AMO release can be referred to for the production drawings of the carrier flange. For large diameter applications with significant temperature variations during operation, and where carrier flanges are not of steel, such as of aluminium, the system must be designed accordingly. Ordering code: WMR Grating accuracy /- 10 µm arc length /- 05 µm arc length Grating pitches/revolution (N) RI position none RI / revolution Kx... distance-coded by request 9

10 3. Measuring scale with grating pitch = 3000 µm for outside scanning Suitable scanning head version: WMK-300 (page 22) WMR-30 measuring ring Thin, stainless-steel measuring ring, consisting of a steel carrier ring, a graduation ring and a protection ring. Special measuring ring versions, including welding to application-specific flanges - by request. For special applications, in agreement with a producer, the measuring ring (circular segment also possible) can be mounted on a flange at the factory.! Accuracy of the graduation is offered in two classes: +/- 20 µm arc length - WMR /- 10 µm arc length - WMR-301 (Higher accuracy by request).! Reference mark: once in 360 is standard. Assembly drawing:! Coefficient of expansion: ~11 ppm! Flange material: no special material is required! ØF: diameter of the flange without the scale body! ØS: diameter of the stop collar Standard program measuring rings: WMR , 0128, 0170, 0240, 0256, 0300, 0341, 0360, 0480, 0512 Further sizes can be made by request. * Recommended concentricity Greater eccentricities of up to ~0,1 mm do not affect the function of the device, but do cause a proportionate deterioration in the accuracy of positioning. N: integral number of grating pitches per revolution (1 pitch = 1 mm arc length) N= 64 to 169 N= 170 to 240 N= 241 to 342 N= 343 to 500 N= 501 to 660 N= 661 to 1000 N= 1001 to 1330 ØF = Nx3/ ±0.01 [mm] ØF = Nx3/ ±0.02 [mm] ØF = Nx3/ ±0.02 [mm] ØF = Nx3/ ±0.03 [mm] ØF = Nx3/ ±0.06 [mm] ØF = Nx3/ ±0.07 [mm] ØF = Nx3/ ±0.10 [mm] The AMO release can be referred to for the production drawings of the carrier flange. For large diameter applications with significant temperature variations during operation, and where carrier flanges are not of steel, such as of aluminium, the system must be designed accordingly. Ordering code: WMR Grating accuracy /- 20 µm arc length /- 10 µm arc length Grating pitches/revolution (N) RI position none RI / revolution 10

11 4. Measuring scale with grating pitch =3000µm for internal scanning Suitable scanning head version: WMK-310 (page 24) WMR-31 measuring ring Thin, stainless-steel measuring ring, consisting of a steel carrier ring and a graduation ring. Designed to be mounted over a "snap-effect" by the customer into a corresponding groove or against a stop collar. (Assembly drawing quoted) For special applications, in agreement with a producer, the measuring ring (circular segment also possible) can be mounted on a flange at the factory.! Accuracy of the graduation is offered in two classes: +/- 20 µm arc length - WMR /- 10 µm arc length - WMR-311 (Higher accuracy by request).! Reference mark: once in 360 is standard. Assembly drawing:! Coefficient of expansion: ~11 ppm! Flange material: no special material is required! ØB: diameter of the flange without the measuring! ØS: diameter of the stop collar * Recommended concentricity Greater eccentricities of up to ~0,1 mm do not affect the function of the device, but do cause a proportionate deterioration in the accuracy of positioning. Standard program measuring rings: WMR , 0240, 0256, 0300, 0341, 0360, 0480, 0512 Further sizes can be made by request. N: integral number of grating pitches per revolution (1 pitch = 1 mm arc length) N= 170 to 240 N= 241 to 342 N= 343 to 500 N= 501 to 830 N= 831 to 1330 N= 1331 to 1830 *)... Assembly only with one stop collar ØB = Nx3/ ±0.01 [mm] ØB = Nx3/ ±0.02 [mm] ØB = Nx3/ ±0.03 [mm] ØB = Nx3/ ±0.05 [mm] ØB = Nx3/ ±0.07 [mm] ØB = Nx3/ ±0.10 [mm] The AMO release can be referred to for the production drawings of the carrier flange. For large diameter applications with significant temperature variations during operation, and where carrier flanges are not of steel, such as of aluminium, the system must be designed accordingly. Ordering code: WMR Grating accuracy /- 20 µm arc length /- 10 µm arc length Grating pitches/revolution (N) RI position none RI / revolution 11

12 This is implemented in the following versions: Scanning electronics 1. Scanning electronics for measuring scale with grating pitch =1000µm and outside scanning WMK-10 miniature scanning head In this version, the size of the scanning head is kept to a minimum, and part of the evaluation electronics is moved out to the connector. This measuring head is suitable for scanning the scales:! Measuring flange WMF-100 (Page 6) or! Measuring ring WMR-100 ((Page 8) 12

13 Technical Data: Operating temperature: Storage temperature: Protection class: Vibration: Shock: Power supply: Cable: Output signals/ system resolutions: (see diagram on page 26) Max. speed: Option: 0 C to 100 C (higher temperatures by request) -20 C to 100 C Scanning head: IP67 (fully potted electronics) Connector electronics / versions with CONNEI connector: IP67 Connector electronics / versions with 15-pin Sub-D connector: IP54 2 <400 m/s for Hz 2 <2000 m/s for 6 ms See the following frequency table (sensor lines available, see page 27) PUR jacket, high flexibility, 5.3 mm, 5(2 x 0.05) + 1 (2 x 0.14) mm² (Bending radius: 10 x d = 50 mm continuous bending; 5 x d = 25 mm single bend)! Output analog 1 Vpp: WMK-101. At the output, the system delivers the same number of sinusoidal periods as grating pitches (N) on the measuring flange, or can provide a multiple of this where the period is divided by the factor D. Basic period 1000 µm arc length. Possible dividing factors D = 1 / 4 / 8 / 10 / 25 / 32 Total number of sinusoidal periods at the output: N = N x D (e.g.: for a measuring flange with 512 grating pitches, where a dividing factor of D = 32 is used, the output provides N = 512 x 32 = sinusoidal periods per revolution)! Output (RS422): WMK-102. Resolutions of: 62.5µm / 50µm / 31.25µm / 25µm / 10µm / 5µm / 1µm / 0.25µm (Arc length after 4x edge evaluation) See the following frequency table LED on the connector housing as an assembly aid (by request) Type WMK WMK WMK-101.SO Output signal 1 Vpp 1 Vpp 1 Vpp Dividing factor (1) D (1) D - Interpolation- (2) factor / resolution Max. Input frequency f [khz] Rotary speed n [rpm] Standard measuring flange WMF-10 or measuring ring WMR Power supply 5V ± 5 % [ma] WMK WMK WMK WMK WMK WMK WMK-102.A WMK-102.B 25x / 10 µm 50x / 5 µm 250x / 1 µm 1000x / 0.25 µm 5x / 50 µm 10x / 25 µm 4x / 62.5 µm 8x / , higher input frequencies by request. Otherwise, the following applies: Maximum speed: n max [rpm] = f [Hz] x 60 / N (grating pitches/revolution) Output frequency fa (frequency limit for the subsequent electronics) WMK-101: fa = f x D [khz] WMK-102: fa = f x I [khz] fa... limited with 400 khz for 1 Vpp N... grating pitches (1 mm, at the circumference of the measuring flange) / revolution (1) D... analog dividing factor (D = 1/4/8/10/25/32) (2) I... digital interpolation factor (I = 4/5/8/10/25/50/250/1000) 13

14 Assembly drawing: WMK-10 Air gap Ordering code: WMK Connector / version pin Sub-D plug pin CONNEI coupling (male) screwed cable gland at the input 6A... input 12-pin CONNEI coupling (female) 6A... output 12-pin CONNEI coupling (male) Maximum input frequency khz khz S khz * *(only possible for a dividing factor D=1) Analog dividing factor (D) fold* fold fold fold fold fold *Basic period 1000 µm arc length Cable lengths m (preferred length) m (preferred length) m X... special length (may require a special no. Sxx) Grating pitches/revolution (N) WMK Interpolation factor (I) Before 4xedge evaluation (10µ (50µ ( 05µ (25µ ( 01µ A (62.5µ (0.25µ B (31.25µ Basic period 1000 µm arc length *... Resolution after 4xedge evaluation in the subsequent electronics (in arc lengths) 14 - Connector / version pin Sub-D plug pin CONNEI coupling (male) screwed cable gland at the input 6A... input 12-pin CONNEI coupling (female) 6A... output 12-pin CONNEI coupling (male) Grating pitches/ revolution (N) Cable lengths m (preferred length) m (preferred length) m X... special length (may require a special no. Sxx)

15 Scanning head with integrated electronics WMK-20 In this version, all the electronics is integrated into the scanning head, and supplies the output signals directly through a standard connector (see page 27), via 1 Vpp or RS-422 line drivers. This measuring head is suitable for scanning the WMF-10 or WMR-10 scale series. Also available in - design for explosion sensitive environments (see datasheet or 15

16 Technical Data: Operating temperature: Storage temperature: Protection class: Vibration: Shock: Power supply: Cable: Output signals/ system resolutions: (see diagram on page 26) Max. speed: 0 C to 100 C (higher temperatures by request) -20 C to 100 C IP67 2 <200 m/s for Hz 2 <1000 m/s for 6 ms See the following frequency table sensor lines available, see page 27) PUR jacket, high flexibility, dmr. 5.3 mm, 5(2 x 0.05) + 1 (2 x 0.14) mm² (Bending radius: 10 x d = 50 mm continuous bending; 5 x d = 25 mm single bend) Maximum length 9 m, up to 50 m with extension cable (see page 27)! Output analog 1 Vpp: WMK-201. At the output, the system delivers the same number of sinusoidal periods as grating pitches (N) on the measuring flange, or can provide a multiple of this where the period is divided by the factor D. Basic period 1000 µm arc length. Possible dividing factors D = 1 / 4 / 8 / 10 / 25 / 32 Total number of sinusoidal periods at the output: N = N x D (e.g.: for a measuring flange with 512 grating pitches, where a dividing factor of D = 32 is used, the output provides N = 512 x 32 = sinusoidal periods per revolution)! Output (RS422): WMK-202. Resolutions of: 62.5µm / 50µm / 31.25µm / 25µm / 10µm / 5µm / 1µm / 0.25µm (Arc length after 4xedge evaluation) See the following frequency table Type WMK WMK WMK-201.SO Output signal 1 Vpp 1 Vpp 1 Vpp Dividing factor (1) D (1) D - Interpolation- (2) factor / resolution Max. Input frequency f [khz] Rotary speed n [rpm] Standard measuring flange WMF-10 or measuring ring WMR Power supply 5V ± 5 % [ma] WMK WMK WMK WMK WMK WMK WMK-202.A WMK-202.B 25x / 10 µm 50x / 5 µm 250x / 1 µm 1000x / 0.25 µm 5x / 50 µm 10x / 25 µm 4x / 62.5 µm 8x / , higher input frequencies by request. Otherwise, the following applies: Maximum speed: n max [rpm] = f [Hz] x 60 / N (grating pitches/revolution) Output frequency fa (frequency limit for the subsequent electronics) WMK-201: fa = f x D [khz] WMK-202: fa = f x I [khz] fa... limited with 400 khz for 1 Vpp N... grating pitches (1 mm, at the circumference of the measuring flange) / revolution (1) D... analog dividing factor (D = 1/4/8/10/25/32) (2) I... digital interpolation factor (I = 4/5/8/10/25/50/250/1000) 16

17 Assembly drawing: WMK-20 R2,25 Ordering code: WMK Maximum input frequency khz khz S khz * *(only possible for a dividing factor D=1) Analog dividing factor (D) fold* fold fold fold fold fold *Basic period 1000 µm arc length WMK Interpolation factor (I) Before 4xedge evaluation (10µ (50µ ( 05µ (25µ ( 01µ A (62.5µ (0.25µ B (31.25µ Basic period 1000 µm arc length *... Resolution after 4xedge evaluation in the subsequent electronics (in arc lengths) * The - option is designated - EX2 Grating pitches/ revolution (N) * * Connector / version 0... none pin DIN connector pin Sub-D plug pin CONNEI plug (male) pin Sub-D plug pin CONNEI coupling (male) 9... special connector or special pin-out 9... (requires special no. Sxx) Cable lengths m (preferred length) m (preferred length) m X... special length (may require a special no. Sxx) Grating pitches/revolution (N) Connector / version 0... none pin DIN connector pin Sub-D plug pin CONNEI plug (male) pin Sub-D plug pin CONNEI coupling (male) 9... special connector or special pin-out 9... (requires special no. Sxx) Cable lengths m (preferred length) m (preferred length) m X... special length (may require a special no. Sxx) 17

18 2. Scanning electronics for measuring scale with grating pitch =1000µm and inside scanning WMK-11 miniature scanning head Suitable for scanning the WMR-110 measuring ring family *) *) *) *) Connector dimensions the same as for the WMK-10 (see page 12) Technical Data: Operating temperature: Storage temperature: Protection class: Vibration: Shock: Power supply: Cable: 0 C to 100 C (higher temperatures by request) -20 C to 100 C Scanning head: IP67 Connector electronics / version with CONNEI connector: IP 67 Connector electronics / version with 15-pin Sub-D connector: IP 54 2 <400 m/s for Hz 2 <2000 m/s for 6 ms See the following frequency table (sensor lines available, see page 27) PUR jacket, high flexibility, dmr. 5.3 mm, 5(2 x 0.05) + 1 (2 x 0.14) mm² (Bending radius: 10 x d = 50 mm continuous bending; 5 x d = 25 mm single bend) Output signals/ system resolutions:! Output analog 1 Vpp: WMK-111. (see diagram on page 26) At the output, the system delivers the same number of sinusoidal periods as grating pitches (N) on the measuring flange, or can provide a multiple of this where the period is divided by the factor D. Max. speed: Option: Basic period 1000 µm arc length. Possible dividing factors D = 1 / 4 / 8 / 10 / 25 / 32 Total number of sinusoidal periods at the output: N = N x D (e.g.: for a measuring flange with 512 grating pitches, where a dividing factor of D = 32 is used, the output provides N = 512 x 32 = sinusoidal periods per revolution)! Output (RS422): WMK-112. Resolutions of: 62.5µm / 50µm / 31.25µm / 25µm / 10µm / 5µm / 1µm / 0.25µm (Arc length after 4x edge evaluation) See the following frequency table LED on the connector housing as an assembly aid (by request) 18

19 Type WMK WMK WMK-111.SO WMK WMK WMK WMK WMK WMK WMK-112.A WMK-112.E Outputsignal 1 Vpp 1 Vpp 1 Vpp higher input frequencies by request. Dividing factor (1) D (1) D - Interpolation- (2) factor / resolution 25x / 10 µm 50x / 5 µm 250x / 1 µm 1000x / 0.25 µm 5x / 50 µm 10x / 25 µm 4x / 62.5 µm 8x / µm Max. Inputfrequency f [khz] Power supply 5V ± 5 % [ma] Maximum speed: n [rpm] = f [Hz] x 60 / N (grating pitches/revolution) max Output frequency (frequency limit for the subsequent electronics) WMK-111: fa = f x D [khz] WMK-112: fa = f x I [khz] fa... limited with 400 khz for 1Vpp N... grating pitches (1 mm, at the circumference of the measuring flange)/revolution (1) D... analog dividing factor (D = 1/4/8/10/25/32) (2) I... digital interpolation factor (I = 4/5/8/10/25/50/250/1000) Assembly drawing: Ordering code: WMK Connector / version pin Sub-D plug pin CONNEI coupling (male) screwed cable gland at the input 6A... input 12-pin CONNEI coupling (female) 6A... output 12-pin CONNEI coupling (male) Maximum input frequency khz khz S khz * *(only possible for a dividing factor D=1) Analog dividing factor (D) fold* fold fold fold fold fold *Basic period 1000 µm arc length Cable lengths m (preferred length) m (preferred length) m X... special length (may require a special no. Sxx) Grating pitches/revolution (N) WMK Interpolation factor (I) Before 4xedge evaluation (10µ (50µ ( 05µ (25µ ( 01µ A (62.5µ (0.25µ B (31.25µ Basic period 1000 µm arc length *... Resolution after 4xedge evaluation in the subsequent electronics (in arc lengths) - Connector / version pin Sub-D plug pin CONNEI coupling (male) screwed cable gland at the input 6A... input 12-pin CONNEI coupling (female) 6A... output 12-pin CONNEI coupling (male) Grating pitches/ revolution (N) Cable lengths m (preferred length) m (preferred length) m X... special length (may require a special no. Sxx) 19

20 Scanning head with integrated electronics WMK-21 This scanning head is suitable for scanning the WMR-110 measuring ring family Also available in - design for explosion sensitive environments (see datasheet or Technical Data: Operating temperature: Storage temperature: Protection class: Vibration: Shock: Power supply: Cable: Output signals/ system resolutions: (see diagram on page 26) Max. speed: 0 C to 100 C (higher temperatures by request) -20 C to 100 C IP67 2 <200 m/s for Hz 2 <1000 m/s for 6 ms See the following frequency table (sensor lines available, see page 27) PUR jacket, high flexibility, dmr. 5.3 mm, 5(2 x 0.05) + 1 (2 x 0.14) mm² (Bending radius: 10 x d = 50 mm continuous bending; 5 x d = 25 mm single bend) Maximum length 9 m, up to 50 m with extension cable (see page 27)! Output analog 1 Vpp: WMK-211. At the output, the system delivers the same number of sinusoidal periods as grating pitches (N) on the measuring flange, or can provide a multiple of this where the period is divided by the factor D. Basic period 1000 µm arc length. Possible dividing factors D = 1 / 4 / 8 / 10 / 25 / 32 Total number of sinusoidal periods at the output: N = N x D (e.g.: for a measuring flange with 512 grating pitches, where a dividing factor of D = 32 is used, the output provides N = 512 x 32 = sinusoidal periods per revolution)! Output (RS422): WMK-212. Resolutions of: 62.5µm / 50µm / 31.25µm / 25µm / 10µm / 5µm / 1µm / 0.25µm (Arc length after 4x edge evaluation) See the following frequency table 20

21 Type WMK WMK WMK-111.SO WMK WMK WMK WMK WMK WMK WMK-112.A WMK-112.B Outputsignal 1 Vpp 1 Vpp 1 Vpp higher input frequencies by request. Dividing factor (1) D (1) D - Interpolation- (2) factor / resolution 25x / 10 µm 50x / 5 µm 250x / 1 µm 1000x / 0.25 µm 5x / 50 µm 10x / 25 µm 4x / 62.5 µm 8x / µm Max. Inputfrequency f [khz] Power supply 5V ± 5 % [ma] Maximum speed: n [rpm] = f [Hz] x 60 / N (grating pitches/revolution) max Output frequency (frequency limit for the subsequent electronics) WMK-211: fa = f x D [khz] WMK-212: fa = f x I [khz] fa... limited with 400 khz for 1Vpp N... grating pitches (1 mm, at the circumference of the measuring flange)/revolution (1) D... analog dividing factor (D = 1/4/8/10/25/32) (2) I... digital interpolation factor (I = 4/5/8/10/25/50/250/1000) Assembly drawing: Ordering code: WMK Maximum input frequency khz khz S khz * *(only possible for a dividing factor D=1) Analog dividing factor (D) fold* fold fold fold fold fold *Basic period 1000 µm arc length WMK Interpolation factor (I) Before 4xedge evaluation (10µ (50µ ( 05µ (25µ ( 01µ A (62.5µ (0.25µ B (31.25µ Basic period 1000 µm arc length *... Resolution after 4xedge evaluation in the subsequent electronics (in arc lengths) * The - option is designated - EX2 Grating pitches/ revolution (N) * * Connector / version 0... none pin DIN connector pin Sub-D plug pin CONNEI plug (male) pin Sub-D plug pin CONNEI coupling (male) 9... special connector or special pin-out 9... (requires special no. Sxx) Cable lengths m (preferred length) m (preferred length) m X... special length (may require a special no. Sxx) Grating pitches/revolution (N) Connector / version 0... none pin DIN connector pin Sub-D plug pin CONNEI plug (male) pin Sub-D plug pin CONNEI coupling (male) 9... special connector or special pin-out 9... (requires special no. Sxx) Cable lengths m (preferred length) m (preferred length) m X... special length (may require a special no. Sxx) 21

22 3. Scanning electronics for measuring scale with grating pitch =3000µm and outside scanning WMK-30 scanning head This scanning head is suitable for applications requiering large assembly and run out tolerances and extreme high speeds, and operates together with the WMR-300 measuring ring family. Also available in - design for explosion sensitive environments (see datasheet or Technical Data: Operating temperature: Storage temperature: Protection class: Vibration: Shock: Power supply: Cable: Output signals/ system resolutions: (see diagram on page 26) Max. speed: 0 C to 100 C (higher temperatures by request) -20 C to 100 C IP67 2 <200 m/s for Hz 2 <1000 m/s for 6 ms See the following frequency table (sensor lines available, see page 27) PUR jacket, high flexibility, dmr. 5.3 mm, 5(2 x 0.05) + 1 (2 x 0.14) mm² (Bending radius: 10 x d = 50 mm continuous bending; 5 x d = 25 mm single bend) Maximum length 9 m, up to 50 m with extension cable (see page 27)! Output analog 1 Vpp: WMK-301. At the output, the system delivers the same number of sinusoidal periods as grating pitches (N) on the measuring flange, or can provide a multiple of this where the period is divided by the factor D. Basic period 3000 µm arc length. Possible dividing factors D = 1 / 4 / 8 / 10 / 25 / 32 Total number of sinusoidal periods at the output: N = N x D (e.g.: for a measuring flange with 120 grating pitches, where a dividing factor of D = 32 is used, the output provides N = 120 x 32 = 3840 sinusoidal periods per revolution)! Output (RS422): WMK-302. Resolutions of: 30µm / 15µm / 3µm / 0.75µm (Arc length after 4x edge evaluation) See the following frequency table 22

23 Type Output signal WMK Vpp WMK Vpp ) WMK-301.SO 1 Vpp WMK / 30 µm WMK / 15 µm Input frequency f [khz] 20 WMK / 3 µm 10 WMK / 0.75 µm 2.5 Assembly drawing: 1) Power supply 5V ± 5 % [ma] 260 1) higher input frequencies by request. Maximum speed: n [rpm] = f [Hz] x 60 / N (grating pitches/revolution) max Output frequency fa (frequency limit for the subsequent electronics) WMK-301: fa = f x D [khz] WMK-302: fa = f x I [khz] N... grating pitches (3 mm, at the circumference of the measuring flange)/revolution D... analog dividing factor (D = 1 / 4 / 8 / 10 / 25 / 32) I... digital interpolation factor (I = 25 / 50 / 250 / 1000) Ordering code: WMK Maximum input frequency khz khz S khz * *(only possible for a dividing factor D=1) Analog dividing factor (D) fold* fold fold fold fold fold *Basic period 3000 µm arc length * Connector / version 0... none pin DIN connector pin Sub-D plug pin CONNEI plug (male) pin Sub-D plug pin CONNEI coupling (male) 9... special connector or special pin-out 9... (requires special no. Sxx) Cable lengths m (preferred length) m (preferred length) m X... special length (may require a special no. Sxx) Grating pitches/revolution (N) WMK Interpolation factor (I) Before 4xedge evaluation (30µ (15µ ( 03µ (0.75µ Basic period 3000 µm arc length *... Resolution after 4xedge evaluation in the subsequent electronics (in arc lengths) * The - option is designated - EX2 * Grating pitches/revolution (N) Connector / version 0... none pin DIN connector pin Sub-D plug pin CONNEI plug (male) pin Sub-D plug pin CONNEI coupling (male) 9... special connector or special pin-out 9... (requires special no. Sxx) Cable lengths m (preferred length) m (preferred length) m X... special length (may require a special no. Sxx) 23

24 4, Scanning electronics for Measuring scale with grating pitch =3000µm and internal scanning WMK-31 scanning head This scanning head is suitable for applications requiering large assembly and run out tolerances and extreme high speeds, and operates together with the WMR-310 measuring ring family. Also available in - design for explosion sensitive environments (see datasheet or Technical Data: Operating temperature: Storage temperature: Protection class: Vibration: Shock: Power supply: Cable: Output signals/ system resolutions: (see diagram on page 26) Max. speed: 0 C to 100 C (higher temperatures by request) -20 C to 100 C IP67 2 <200 m/s for Hz 2 <1000 m/s for 6 ms See the following frequency table (sensor lines available, see page 27) PUR jacket, high flexibility, dmr. 5.3 mm, 5(2 x 0.05) + 1 (2 x 0.14) mm² (Bending radius: 10 x d = 50 mm continuous bending; 5 x d = 25 mm single bend) Maximum length 9 m, up to 50 m with extension cable (see page 27)! Output analog 1 Vpp: WMK-311. At the output, the system delivers the same number of sinusoidal periods as grating pitches (N) on the measuring flange, or can provide a multiple of this where the period is divided by the factor D. Basic period 3000 µm arc length. Possible dividing factors D = 1 / 4 / 8 / 10 / 25 / 32 Total number of sinusoidal periods at the output: N = N x D (e.g.: for a measuring flange with 120 grating pitches, where a dividing factor of D = 32 is used, the output provides N = 120 x 32 = 3840 sinusoidal periods per revolution)! Output (RS422): WMK-312. Resolutions of: 30µm / 15µm / 3µm / 0.75µm (Arc length after 4x edge evaluation) See the following frequency table 24

25 Type Assembly drawing: Output signal WMK Vpp WMK Vpp ) WMK-311.SO 1 Vpp WMK / 30 µm WMK / 15 µm Input frequency f [khz] 20 WMK / 3 µm 10 WMK / 0.75 µm 2.5 1) Power supply 5V ± 5 % [ma] 260 1) higher input frequencies by request. Maximum speed: n [rpm] = f [Hz] x 60 / N (grating pitches/revolution) max Output frequency fa (frequency limit for the subsequent electronics) WMK-311: fa = f x D [khz] WMK-312: fa = f x I [khz] N... grating pitches (3 mm, at the circumference of the measuring flange)/revolution D... analog dividing factor (D = 1 / 4 / 8 / 10 / 25 / 32) I... digital interpolation factor (I = 25 / 50 / 250 / 1000) Ordering code WMK-310: WMK Maximum input frequency khz khz S khz * *(only possible for a dividing factor D=1) Analog dividing factor (D) fold* fold fold fold fold fold *Basic period 3000 µm arc length * Connector / version 0... none pin DIN connector pin Sub-D plug pin CONNEI plug (male) pin Sub-D plug pin CONNEI coupling (male) 9... special connector or special pin-out 9... (requires special no. Sxx) Cable lengths m (preferred length) m (preferred length) m X... special length (may require a special no. Sxx) Grating pitches/revolution (N) WMK Interpolation factor (I) Before 4xedge evaluation (30µ (15µ ( 03µ (0.75µ Basic period 3000 µm arc length *... Resolution after 4xedge evaluation in the subsequent electronics (in arc lengths) * The - option is designated - EX2 * Grating pitches/revolution (N) Connector / version 0... none pin DIN connector pin Sub-D plug pin CONNEI plug (male) pin Sub-D plug pin CONNEI coupling (male) 9... special connector or special pin-out 9... (requires special no. Sxx) Cable lengths m (preferred length) m (preferred length) m X... special length (may require a special no. Sxx) 25

26 In order to determine the absolute angular position in the direction of measurement between the scanning head and the measuring flange, a reference track is integrated on to the scale, disposed parallel to the measuring track. This reference track consists of one or more reference marks (correspondingly marked on the measuring ring), which are detected by the sensors in the scanning head. The reference marks can be arranged in the following ways: Description of the reference marks 1. Single reference marks These can be placed at any angular desired location on the measuring ring. The standard arrangement is for a single reference pulse to be output for each revolution, assigned to a mounting hole in the measuring flange. 2. Distance-coded reference marks Coded distribution of these marks on the measuring ring allows the controller, if it is capable of this function, to determine the absolute position after passing two neighbouring marks. All the WMI systems are offered with coded reference marks having the following basic spacings (K): Identifier: Reference mark First basic mark Basic spacing K=XX Positive direction of counting WMI-0360-K1 WMI-0512-K3 WMI-0720-K1 WMI-0900-K2 WMI-1024-K3 Basic spacing K in number of periods Absolute position after max ,5 Signal not divided (dividing factor D=1) Signal subject to analog dividing (dividing factor D=1) K > Number of sinus periods of 1000 µm arc length K' > Number of sinus periods after division at the output of the measuring system at the output of the measuring system K K K' K' RI RI RI RI RI RI RI K K K K K K+1 K+1 RI RI RI RI RI RI RI K' K' K' K' 2 +D 2 -D 2+2D 2-2D K'+D K' 2 +3D K'+D K' = K x D 0 Direction of counting Vpp output signals Recommended configuration of the subsequent electronics: Description of the output signals 0 Direction of counting 360 A+, B+, RI+ (and their inverted signals): direct signal output with dividing factor D=1 A +, B +, RI + (and their inverted signals): divided signal output with dividing factor D=1 - RS422 output signals Recommended configuration of the subsequent electronics: 26