LMA10 absolute magnetic encoder system

Transcription

1 Data sheet LMA10D01_01 Issue 1, 6 th May 2013 LMA10 absolute magnetic encoder system LMA10 is an absolute magnetic linear encoder system which has been designed for motion control applications as a position and velocity control loop feedback element. The encoder system is highly reliable due to contactless absolute measuring principle, built-in safety algorithms and high quality materials/components used. The information carrier is a magnetic scale which consists of a stainless steel substrate with an elasto-ferrite layer. The elasto-ferrite layer is magnetised with two tracks. The incremental track is magnetised with 2 mm long (south or north) poles and the absolute track is magnetised by a pseudo random binary sequence (PRBS) absolute code with 13 bit length. The elastoferrite layer is immune to chemicals commonly found in industry. The readhead includes Hall sensor arrays for PRBS track reading, an AMR sensor for incremental track reading, interpolation electronics and custom logic circuitry. The data from the Hall arrays and interpolator are processed in the logic circuitry using speical algorithms to determine the absolute position. The electronic design provides extremely short response and recovery times, which consequently makes it ideal for applications with high dynamic control loops. The encoder failure diagnostics is available through a serial communication channel and status LED. If a failure is diagnosed, the encoder needs to be switched off and then switched on again in order to resume correct functionality. A True absolute system Suitable for high dynamic control loops Limited space application High accuracy Resolution to µm Lengths up to 16.2 m Speeds up to 7 m/s at µm resolution Integral status LED BiSS-C unidirectional communication protocol Simple and fast installation Robust measuring principle Excellent degree of protection to IP68 associate company

2 Data sheet LMA10D01_01 LMA10 dimensions Dimensions and tolerance in mm M3 through D H 10 Incremental track Absolute track 3 ± M3 deep 4 NOTE: Orientation of readhead relative to AS10 magnetic tape should be according to drawing. As reference use surface print on AS10 tape or use magnetic viewer (see image below). Magnetic viewer LMA10 installation tolerances Ride height Incremental track AS10A\WWYY.BB Absolute track AS10A\WWYY.BB With back-adhesion tape (option A) With back-adhesion tape, with cover foil (option B) No back-adhesion tape (option I) No back-adhesion tape, with cover foil (option N) Magnetic scale thickness (D) Ride height (H) 1. ± ± ± ± Roll ±1 Pitch ±0. Lateral offset Yaw ±0. 3 ±0.2 2 Status LEDs LED Communication Status green yes valid position data green flashing no valid position data orange yes valid position data, close to overspeed orange flashing no valid position data, close to overspeed red yes invalid position data red flashing no invalid position data

3 LMA10 technical specifications System data Incremental pole length Maximum scale length Data word length Code System accuracy Short range accuracy Hysteresis Repeatability 2 mm 16.2 m 34 bit Pure binary ±40 µm/m < ±10 µm/10 mm < 1 µm (0.1 mm ride height) Unit of resolution Available resolutions µm µm µm 1.93 µm Maximum traverse velocity 1.7 m/s 3. m/s 7 m/s 14 m/s Maximum velocity during power on Electrical data Power supply Set-up time after switch-on Power consumption (without load) Mechanical data Mass Cable Environmental data 0. m/s V ± % (voltage on readhead) Consider voltage drop over cable < 0 ms < 20 ma Readhead (with 1 m cable, no connector) 41 g, magnetic scale 60 g/m Temperature Operating 0 C to + C PUR high flexible cable, drag-chain compatible, double-shielded mm 2 ; durability: 20 million cycles at 20 mm bend radius Storage -20 C to +8 C Vibrations ( Hz to 2000 Hz) 300 m/s 2 (IEC ) Shocks (11 ms) 300 m/s 2 (IEC ) Humidity 100 % (condensation permitted) EMC Immunity IEC (particularly: ESD: IEC ; EM fields: IEC ; Burst: IEC ; Surge: IEC ; Conducted disturbances: IEC ; Power frequency magnetic fields: IEC ; Pulse magnetic fields: IEC ) EMC Emission IEC (for industrial, scientific and medical equipment: IEC 011) Environmental sealing IP68 (according to IEC 6029) A associate company 3

4 Data sheet LMA10D01_01 LMA10 communication protocol BiSS-C unidirectional Type of interface Signal level Maximum MA frequency Length of position data Length of status data BiSS-C unidirectional (point to point) RS422 MHz 26 bit 2 bit Length of CRC 6 bit (inverted bit output polynomial 0 43) Position data encoding Latency time * Recovery time ** Pure binary 0.8 μs at MHz MA frequency; otherwise 4 MA clock periods μs Timing diagram Encoder latches position value MA SLO ACK START CDS MSB LSB Error Warning CRC CRC * t latency Position data Status data CRC data ** t recovery Status data bit Type H L Possible reason for failure E Alarm Invalid position data OK Movement too fast, demagnetisation, sensing distance too high, orientation of readhead and scale W Warning Valid position data, close to overspeed OK Current velocity is >80 % of maximum traverse velocity Connections 9 pin D type plug Pin Colour Signal 1 internal shield 2 pink MA+ 3 blue MA- 4 green n.c. brown + V 6 grey SLO+ 7 red SLO- 8 yellow n.c. 9 white 0 V case outer shield 4

5 LMA10 readhead part numbering LMA10 DC 13B 10 A 00 Output type DC - BiSS-C communication protocol Special requirements 00 - No special requirements (standard) Resolution 13B - 2/2 13 mm (~ µm) 12B - 2/2 12 mm (~ µm) 11B - 2/2 11 mm (~ µm) 10B - 2/2 10 mm (~ 1.93 µm) 09B - 2/2 9 mm (~ µm) 08B - 2/2 8 mm (~ µm) Connector option A - 9 pin D type plug F - Flying lead (no connector) Cable length m (standard) Ends prepared for end clamping (options C and P ) Hole to hole distance 1 Scale length Positive direction 3 ±0. 3. ±0. 10 ±0.2 AS10A/WWYY.BB End clamp End clamp Beginning of measuring length Measuring length 2 1 Hole to hole distance = scale length + 6 ±1 mm (for end clamp mounting) End of measuring length 2 Measuring length = scale length - 42 mm AS10 magnetic scale part numbering AS 10 A A 00 Scale width mm width Special requirements 00 - No special requirements (standard) Scale length xxxxx - Where xxxxx equals scale length in mm Accessories part numbering Cover foil CF Options A - No cover foil B - Cover foil supplied (separately - cm longer than tape) C - No cover foil, ends prepared for end clamping I - No back-adhesion tape N - No back-adhesion tape, with cover foil P - No back-adhesion tape, ends prepared for end clamping G - Track system; sides prepared for insertion into track system H - Track system; sides prepared for insertion into track system, with cover foil Foil width mm width mm width (CF for track system option G) Foil length xxxx - Where xxxx equals foil length in cm Applicator tool for magnetic scale and cover foil End clamp kit (2 clamps + 2 screws) Magnetic viewer LMA10ASC00 LM10ECL00 MM0001 A associate company

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