DS Absolute Posi on, Rotary Electric Encoder
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1 DS Data Sheet, V 1.0a, July DS Absolute Posi on, Rotary Electric Encoder The DS-247 is a member of the DS series of Electric Encoders, based on Netzer Precision proprietary technology. These encoders offer many advantages, some unparalleled: Low profile (18 mm). Hollow, floa ng sha. No bearings or other contac ng elements. High precision. High tolerance to temperature, shock, moisture, EMI, RFI and magne c fields. Analog or mul ple digital interface op ons. Extremely low power op ons. The DS-247 is suited to demanding applica on such as: aerospace, medical, instrumenta on, automa on, etc. Mechanical Allowable moun ng eccentricity (2) ±0.2 mm Allowable rotor axial mo on (2) ±0.1 mm Rotor iner a gr mm 2 Total weight Outer diameter / Inner diameter / Profile Material (stator, rotor) 665 gr 247 / 170 / 18 mm Aluminum, Ultem Electrical - common to all types Supply voltage 5V ± 5% (3) Interconnec on 6 pins connector + Tefloncoated, loose AWG-32 wires Environment EMC (4) IEC , IEC Opera ng temperature range -55 C to +125 C (5) Rela ve humidity <98 % - non condensing Shock endurance IEC ; 100 g for 11 ms Vibra on endurance IEC ;20 g Hz Protec on (6) IP 40 The holis c (1) structure of the Electric Encoder provides generous moun ng tolerance, thus obvia ng the need for internal ball bearings. The lack of bearings and components such as flexible couplers, glass disc, light sources and detectors, along with very low power consump on makes the DS-247 encoder virtually failure free. The internally shielded, DC operated Electric Encoder includes an electric field generator, a field receiver, a sinusoidal shaped dielectric rotor, and processing electronics. The output signals of Electric Encoder are analog Sine / Cosine represen ng the rota on angle. The digital outputs are obtained by further processing which may be either internal or external to the encoder. Output op ons Analog Digital Sine/Cosine SSi AqB + Index Performance Electrical Cycles/Revolu on Fine/Coarse channels (7) 128 / 7 Angular resolu on (using 12 bit A/D conversion) (8) 20 bits Sta c error (with offset compensa on) (9) < 10 mdeg Maximum opera onal speed (10) 375 rpm Measurement range Unlimited rota on
2 Digital - SSi Interface (absolute posi on) DS Dn-0 Output signal parameters Signal latency (11) Output code Serial output SSi Clock SSi Monoflop me Clock Frequency Maximum payload Electrical parameters Current consump on ~250 μsec Binary Differen al RS-422 Differen al RS μsec MHz 21 bit ~ 180 ma The na ve output signals are analog Sine / Cosine of the rota on angle. The digital outputs are obtained by using external modules. Synchronous Serial Interface (SSi) allows for serial transmission of absolute posi on data from the Electric Encoder responding to controller clock pulses. The Encoder and controller are linked by clock and data differen al signal lines. Figure 1 illustrates the SSi ming diagram used by the Electric Encoder which is implemented in the addi onal digital electronics which provides advanced calibra on and monitoring op ons using the NCP (Netzer Communica on Protocol) using factory supplied so ware tools. Electric Encoder Gnd 1 (Black) C/F 2 (Grey) Sin 3 (Blue) Vr 4 (Green) Cos 5 (Yellow) +5V 6 (Red) SC2SSi Interpolator Host System SSi-CLK / NCP RX 1 (Grey) 5V SSi-CLK / NCP RX 2 (Blue) SSi-DATA / NCP TX 3 (Yellow) 5V SSi-DATA / NCP TX 4 (Green) Gnd 5 (Black) +5V 6 (Red) 120 SC2SSi - Wires color code # Name Color Func on 1 Clock + Grey 2 Clock - Blue SSi Clock 3 Data - Yellow 4 Data + Green SSi Data 5 GND Black Ground 6 +5V Red Power supply Calibra on and analysis over NCP A/D Electric angle Algorithm Absolute posi on Electric Encoder SC2SSi external interpolator Host system - 2 -
3 Digital - SSi interface (absolute posi on) DS Dn-0 Data transmission timing diagram t1 Clock a 1 n * T T t3 2 3 n+1 Data t2 n n MSB LSB Synchronous serial data t3 pulse train Figure - 1 n = total number of data bits. T = clock period (sec) - user defined. 1/T = clock frequency MHz (user defined). t1 = minimum me required for the encoder to freeze data and preset the shi registers before receiving the first rising edge to prompt the MSB t2 = data transmission delay (increases with cable length) t3 = required delay to refresh posi on data between subsequent posi on reads. Posi on calibra on & signal analysis with SSi interface: The Electric Encoder processing capabili es enable calibra on, built-in tests (BIT) and advanced setup, using the available so ware tools, such as: A. Simple calibra on procedure using the SSi Explorer (CAA, Offsets, Zero posi on se ng). B. Field aid for valida ng proper mechanical moun ng
4 Digital - AqB + Index interface (incremental) DS Cn-0 Output signal parameters Signal latency (11) Format Phase rela onship with CW sha rota on (as seen from top) Index pulse width 250 μsec Differen al RS-422 A leads B ½ A Electrical parameters Current consump on ~ 130 ma SC2AqB - Wires color code # Name Color Func on 1 GND Black Ground 2 +5V Red Supply voltage 3 A+ Yellow 4 A- Yellow/Black 5 B+ Blue 6 B- Blue / Black 7 Z+ Orange 8 Z- White Quadrature outputs Index A/D Electric angle AqB interpola on Electric Encoder SC2AqB interpolator AqB + Index
5 Analog - Sine/Cosine output (absolute posi on) DS Output signal parameters Signal latency (11) 400 μsec Fine-mode output noise (DC to 1kHz) (12) 200 μv (p-p) Fine-mode output amplitude (13) 1V ± 10% Coarse-mode output amplitude 1V ± 10% Phase rela onship (CW sha rota on - seen Sine leads Cosine from top) Signal bandwidth DC to 1 khz Electrical parameters Output resistance <1 Ω Current consump on ~ 10 ma (14) Coarse and Fine channels The DS-247 has two opera onal modes: a Coarse-mode and a Fine-mode - equivalent to two separate encoders in a common housing. The modes are selectable by a logic C/F command; logic 0 (0V to +0.5V) selects the Coarse-mode, which has 7 Electrical Cycle/Revolu on (EC/R) while logic 1 (+3V to +5V) selects the Finemode which has 128 EC/R. The switching me is less than 1 ms. The Coarse-mode outputs need to be read only upon system ini a on a er which the encoder is permanently switched to the Fine mode. Coarse and Fine sine/ cosine pairs are used to calculate the ini al absolute posi on, from that point tracking the Fine-channel outputs provides the absolute mechanical rota on angle with the specified accuracy and resolu on. All output signals are referenced to an internally generated voltage Vr (~2.25V) Wires color code # Name Color Func on 1 GND Black Ground 2 C/F Grey Coarse / Fine 3 Sine Blue Sine signal 4 Vr Green V reference 5 Cosine Yellow Cosine signal 6 +5V Red Power supply Absolute Posi on calcula on: The analog Sine /Cosine outputs convey the electric angle of the Coarse or Fine signals. The absolute mechanical angle is computed by digi zing the analog signals and applying factorysupplied algorithms. Please refer to AN-02 and AN-03. A/D Electric angle Algorithm Absolute posi on Electric Encoder Host system - 5 -
6 Notes 1. The output signals are generated by the whole area of the rotor - see AN Accuracy may degrade depending on moun ng tolerances and the Sine/Cosine amplitudes may exceed the A/D conversion range -see AN The encoder includes an internal 4.5V LDO voltage regulator. 4. Standard DS encoders are insensi ve to ESD, stray magne c and capaci ve coupling from the host system current consump on. However it is advisable to allow a discharge path of no more than several tens of kω between the machine sha and the electronic s ground, not leaving it electrically floa ng. 5. Consult factory. 6. For higher ingress protec on the encoder should be mounted inside a sealed enclosure. 7. The number of electrical sine/cosine cycles generated in one mechanical rota on. 8. The angular resolu on is determined by the ra o of the Fine - channel amplitude and the encoder inherent noise see AN Not including dynamic error. For higher sta c accuracy consult factory. 10. Determined by the Fine-channel EC/Rs and the internal low pass filters, for higher rota on speed consult factory. 11. An inherent signal delay inversely propor onal to the internal filter s cut-off frequency (1 khz, 3rd order Bessel) and resul ng in a dynamic error propor onal to the rota on speed - see AN For measuring the noise and valida ng the interconnec on see AN With the rotor at its nominal axial posi on - see AN For a micro-power version with current consump on down to 50 3V consult factory. Resolu on In bits Steps /360 mdeg /step Arc-sec /step mrad /step , , , (DS-247) 1,048, ,097, ,194, Related documents: DS-247 Mechanical Installa on Guide - 6 -
7 Ordering DS Product line OD EC/R Outputs 0 - Analog: Sine/Cosine DS DI - C C - Digital : AqB + index (external module SC2AqB) D - Digital : SSi (external module SC2SSi03) Connector Resolu on CPR 4,096 8,192 16,384 Binary 32,768 65, ,072 Bit Code A B C D E F G H I Resolu on CPR 8,000 16,000 Decimal 32,000 64, , , , , ,000 1,048,576 1,0124,000 Bit Code K L M N O P Q R Analog Sin/Cosine SC2SSi external module CAT # SC2SSi-03 [42 x 13 mm] Default CAT # SC2SSi-05 [30 x 13 mm] Digital SSi SC2AqB external module CAT # SC2AqB-00 [25 x 20 mm] Digital AqB - 7 -
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