Angular Position Transducers. inductive magnetoresistive optoelectronic

Transcription

1 Angular Position Transducers inductive magnetoresistive optoelectronic

2 Angular Position Transducers with inductive, magnetoresistive or optoelectronic measuring systems Construction Measuring systems For measuring angular positions and converting them into electrical signals for teletransmission purposes, either potentiometric (see data sheet precision rotary potentiometer ), inductive, magnetoresistive, incrementally or absolutely coded angular position transducers can be used according to the particular application. They serve e.g. for recording the position of: weir gates and segmental valves valves and control drives ship s engine telegraphs and rudder mechanisms swing gears and lifting gears of cranes machine tools and handling equipment as well as for set-point adjustment on control transmitters for cranes, excavators and marine applications Inductive angular position transducers of the non-contacting type are preferably used on measuring points, which are exposed to extreme vibration or shock or to aggressive atmospheres. This applies mainly to measurement problems one is confronted with in energy industry and chemical plants, for instance while measuring the actual value of the position of variable speed drives, or of machines in paper-processing and textile industry, while measuring the position of dancer rollers and very frequently in pendulum systems for measuring tilt angles on cranes and excavators. Magnetoresistive angular position transducers are extremely robust measuring systems without a shaft exit, fully hermetically encapsulated and capable of measuring contactless the angular position of a permanent magnet, which is attached to the measuring object. N S inductive magnetoresistive optoelectronic Transducers of this type are predominantly used in commercial vehicles for sensing the position of steering type axles or the angle of the articulated arm of excavators. For such measurement tasks transducers without a shaft exit are used. Transducers with shaft exit also contain a hermetically encapsulated electronic unit (see sectional view). Such transducers are frequently used in water supply and distribution, e.g. for sensing the position of mitre gates, weir gates and similar facilities. Optoelectronic angular position transducers are high-resolution measuring systems, available in a single- and multi-turn version, with low temperature coefficient, outputting digitally coded angular position signals. Single-turn transducers are used e.g. in the railway vehicle domain in connection with traction switches on cranes as slewing ring transmitters. Multi-turn transducers are preferably used together with rope length measuring systems on hauling plants, bearer cable winches of crane systems or in the field of machine tool engineering for sensing the tool position. C

3 System versions...series WD differential inductor Inductive transducer systems are available as models of synchro size 20 (series 6.20) and synchro size 23 (series 1023). They contain a differential inductor, realized in form of a ring winding with a non-contact tapping. The electrical output signals representing zero and final value of the mechanical drive shaft angle are adjustable within a broad range of limits via trimming potentiometers of the built-in or separate electronics. For applications in potentially explosive installations, transducer systems as well as electronic components are available with a degree of protection EEx and Exd with ATEX-Approval....series MR permanent magnet N sin/cos S CAN Magnetoresistive transducer systems are available as models of synchro size 23, optionally with or without driving shaft (see dimensional drawing). They are fully enclosed in an aluminium casing and contain a high-precision magnetoresistive angular position sensor. This sensor provides a sine/cosine signal, which depends on the direction of the magnetic field of a permanent magnet. A special integrated circuit converts the sine/cosine signal into an analogue or digital signal, which is proportional to the angle. A built-in micro controller provides for linearization, calculation of an adjustable zero offset (zero referencing) and error control procedure....series Xi and XA coded disk CAN Optoelectronic transducer systems are available as models of synchro size 23, incremental and absolute coded design. Incremental systems convert the angle to be measured into a proportional number of pulses, appearing in two tracks A and B with an offset of 90 for identification of direction. Absolute coded systems are available as single- and multi-turn encoders. They contain a Gray-coded rotating disk with 12 concentric tracks, which are optically scanned by infrared light emitting diodes and phototransistors. Signal output can be either parallel via NPN or PNP transistors or analogue, via a digital-to-analogue converter (DAC) with current output All transducers can also be supplied, with field bus interface CANopen standard and in a user-specific data format respectively.

4 Electrical specifications of inductive systems Winding data With built-in electronics Voltage output Current output Linearity Resolution Temperature coefficient Angle ranges WD WD6.20-E up to 90 WDG6.20 WD Output in connection with separate electronics only, Partial inductance 35 mh, total inductance 90 mh DC resistance 470, linearity <± 0.5 % WDG6.20-E WD1023-E up to 360 up to V, R 500, 4-wire circuit L 0 or 4 20, R L 600, 2-, 3- or 4-wire circuit V DC, approx. 60, 2-wire 20 ± 0.5 % infinite max. 1 / 10 K, typical 0.5 / 10 K adjustable by rear trimming potentiometer from 0 6 to 0 24 or 0 24 to 0 90 or 0 90 to WDG WDG1023-E up to 360 of magnetoresistive systems Analogue output Linearity Resolution Error signal Digital output Approval MR-DA-1023 und MR-CAN to , R L 600 ; or 2 10 V, R L 500 ± 0.2 % analogue 0.05 %, digital 12 bit signal decay in case of error detection towards 2 resp. 1 V CANopen standard VDC TÜV-Approval for system components relevant to safety N S C of optoelectronic systems Signal output Output current Pulse number / 360 Pulse frequency Scanning code Number of steps DA-Converter Scanning code Number of steps Scanning code Number of steps Xi-1023 incremental tracks A + B with an offset of 90 and zero reference pulse; PNP oder NPN-Transistor < 50, short-circuit proof 60, 100, 120, 200, 360, 600, 1000, 1800 max. 50 khz V DC, < 50 XA12-DA-1023 single-turn absolute 360 Gray-code 4096 / bit with output 4 20, R L V DC XA12-CAN-1023 single-turn absolute 360 Gray-code 4096 / bit CANopen standard XA16-CAN-1023 multi-turn absolute max. 64 revolutions, max steps 16 bit Gray-code 1024 / bit CANopen standard General data Temperature Test voltage EMC-Test according to -30 to +70 C 500 V, 50 Hz, 1 min DIN Generic Emission Standard DIN Generic Immunity Standard

5 Models WD6.20, WDG6.20 WE-Vi K16 separate electronics ,5 Model without signal converter WD6.20-E, WDG6.20-E with electronics WD1023, WDG1023-E, Xi/XA , ,2 f TK- 42 / M4 60 Model with signal converter MR 1023 external magnet 70 N S MR 1023 built-in magnet f7 TK- 60 / M TK- 42 / M Protective casing PTB 03 ATEX 1062 Protective casing PTB 03 ATEX h M6/28 deep Also available with gearing up to 125:1

6 Mechanical specifications Casing material Casing degree of protection Shaft material Shaft bearing Actuation torque Angle rotation Weight Resistance to vibration Shock resistance Electrical connections Approval WD6.20 WDG6.20 Xi 1023, XA 1023, MR1023, WD1023, WDG1023 Aluminium, grey anodised Aluminium, grey varnished, flange anodised IP30 IP30 IP65 to IP68 stainless steel ball bearing 0.05 Ncm 70 g 0.1 Ncm 90 g 2.5 Ncm see electrical specifications 400 g Hz, 10 g 50 g, 6 ms Fastonplug or stranded wire connector or cable connection Protective capsule resistant to pressure PTB 03 ATEX 1062, resp X f7 Backlash compensated gear with coupling suitable for the shaft of transmitter series L 1 L2 TK- 42 / M4 L 1 = 54mm up to 9:1 L 2 = 64mm up to 81:1 L 3 = 74mm up to 729:1 L 3 specifications of the separate electronics Input Transmission line Output Weight Option Wiring diagram WEVi /K16 transducer signal from WD WeVi EEx/K16 transducer signal from WD NBW EEx/ K16 ex-isolated transmitter 0/ 4 20 intrinsically safe 2 max. 300 m shielded, LIYCY 3 x 0.75 mm 0 or or 4 20 intrinsically safe 0/ 4 20 electrically isolated R L 600 R L 600 from input R L VDC or 230 V AC 300 g also available with min-maxposition limiting contacts 8 24 V intrinsically safe from NBW 300 g 230 V AC 300 g V intrinsically 0/ intrinsically 0/ VAC Protective casing For protection against mechanical damage as well as dusty and moist industrial atmospheres, we offer a series of protective casings for all types of transducers; these protective casings can partly be equipped with gear heads and limit switches, with a degree of protection up to IP 68 (see data sheet protective casings ). Berlin Fernsteuergeräte Kurt Oelsch GmbH Jahnstraße D Berlin Phone Fax +49 ( 30) ( 30) info@fernsteuergeraete.de Kablow FSG Fernsteuergeräte Meß- und Regeltechnik GmbH Mühlenweg 2-3 D Kablow Phone Fax +49 ( 33 75) ( 33 75) Heppenheim Fernsteuergeräte Kurt Oelsch GmbH & Co. KG Weiherhausstraße 10 D Heppenheim Phone Fax +49 ( 62 52) ( 62 52)