The OCD optical encoders are based on a single turn sensor that features a highly Opto-ASIC, which offers a resolution of up to 16 bit per revolution. In addition, a maximum of 14 bit (16384 revolutions) can also be measured by a gear in multi-turn variants. Featuring a code disc built from dimensionally stable, break-proof plastics provides outstanding precision, dynamics and resolution.

Posital’s encoders comply with rigid electromagnetic compatibility requirements, as they feature protective circuits for interface connection and power supply. This enables the encoders to provide reliable operation even under harsh conditions. The encoders’ interface design has been extended to include TTL levels for the data outputs. Seamlessly combined with a vast input voltage range, common for the automation industry, the interface design covers almost all possible applications.

The encoders also feature a push/pull technology that allows it to be connected to standard I/O components from different controller manufacturers. Compatible with open collector variants, the robust encoders offer a protection class of up to IP66.

With suitable couplings or gear wheels, the encoders can be directly integrated into plants and machines. The encoders’ control unit enables users to set its position as well as the preferred zero position in the machine.

Motion Control Tips

The S2E’s basic design consists of a non-contact sensor head and a magnetically-encoded ring — an assembly that can easily installed by users. Offering a quadrature output of up to 46,000 pulses per revolution, the assembly features a mounting hub that enables the magnetic ring to be adapted to various applications.

Balluf’s S2E provides a PLC the position information required for most conveyor-based manufacturing operational functions like multiple station error proofing with single station rejection. The position information provided by the new rotary encoder can also be utilized by the main programmable logic controller to develop programmable cams that are software driven.

It also provides accurate angle measurement for virtually all apparatus revolving around a shaft. The S2E, for instance, can be fitted on a miter saw’s spindle. An output signal can be transmitted to a digital display to provide the operator an accurate visual representation of the saw blade’s angular position.

The S2E also offers accurate monitoring and control of any rotating shaft, including a motor or any rotating equipment. Thus, rotational positions of solar reflectors can be monitored easily by the S2E, with its index pulse utilized to set home position.

Balluf’s new rotary encoder is IP67 rated, which implies that it can withstand outdoor environments.

Motion Control Tips

This rotary encoder can be operated directly in Zone 1 and Division 1 work environments where ignitable concentrations of flammable liquids vapors or gases are likely to exist in normal operating conditions.

The reliable and rugged rotary encoder eliminates the need for an accompanying Intrinsic Safety barrier, effectively simplifying installation. This also results to a more streamlined feedback system for the explosion proof environments.

Utilizing the explosion proof construction method, the HS52 rotary encoder is fitted in an enclosure that has the capability to contain and withstand even the most volatile gas-to-air mixture internal explosion.

The rotary encoder is equipped with a flexible shaft bore design, allowing it to be rigidly mounted to prevent stress to encoder bearings. The design also provides a more secure attachment to the hazardous area conduit fittings.

In addition, the encoder’s compact hollow shaft design provides engineers space-saving advantages not otherwise found in traditional shafted encoders. As ideal position sensing solution for oil and gas industries, the HS52 is also suitable for use in spray painting applications, solvent refining operations and other explosive environments where operating conditions are extreme and space is a premium.

Motion Control Tips

Featuring excellent accuracy, adaptability and reliability, the new devices are offered with digital or analog electrical interfaces. With measurement technology based on a Hall-effect sensor and a rotating magnet, the analog models make a great alternative for traditional potentiometers as it provides superior longevity, reliability and accuracy.

Unlike potentiometers, these new encoders do not run the risk of losing accuracy due to surface contamination or wear since there is no contact among its components. The encoders also offer flexible range-setting feature that allows the installer to “teach” the device the potential mechanical motion’s limits during operations. When the limits have been established, the device will instantly self-calibrate to enable the full range of electrical output to exactly match the mechanical movement’s full range.

This results to a remarkable improvement on the control system’s overall accuracy. To simplify the setup, the analog-output models also provide LEDs and buttons on its casing.

The MCD encoders’ digital outputs include CANopen, serial (SSI) and DeviceNet. These tough MCD encoders feature heavy-duty enclosures to protect the measurement components from dust, shock and vibration, as well as mechanical loads and moisture (up to IP 69K ratings). The hollow-shaft models also feature permanently lubricated brass and steel gear-set for a trouble-free and long service life.

Motion Control Tips

Built for maximum uptime and make readies, the M3 Rotary Cutter is designed with a new anvil pin cylinder that features a push-through pin system and a positive bottom seating. This helps the pins from sinking whenever the rotary cutter is in use.

Featuring soft-cut heavy blade blocks and soft-cut die rule blocks, the M3 Rotary Cutter also provides more accurate and faster knife positioning. Aside from keeping the knife in its proper position when finding the knife block in the cylinder, the knife locating bar also delivers shorter make readies.

To strip away the non-print gap, the M3 Rotary Encoder features a new stripper finger system that utilizes a tool-less system to set the locating bar. This allows the locating bar to effortlessly and quickly line up the stripping pins.

Its integrated Siemens SIMOTION drive and controls ensures that the rotary cutter offers extreme accuracy and reliability.

The M3 Rotary Cutter, which will be presented at the Graph Expo, will be fitted with the XTC Delivery Table, which offers a great return on investments with its fewer jams, increased speeds and easier operation. Effective at handling coated covers and lighter basis weight papers, the new mechanical design and the new servo technology deliver reduced make-ready time as well as start-up waste. The delivery’s independent drive from the cutter allows various on-the-run adjustments that were not offered in mechanically driven systems.

Motion Control Tips

The new AH36M rotary encoder comes with two external inputs that allow it to be set to the preferred measurement range in just a few simple steps. This provides users the complete signal amplitude (from 0 to 10 V or four to 20 mA) across the exact measurement range that the user has selected. Whether the user wants to measure two, 10 or 100 revolutions, this new rotary encoder provides the best solution for the job, as it eliminates the need to stock encoders with various measurement ranges or gear ratios.

Using battery-free multi turn and non-wearing technology, the cost-effective rotary encoder completes the chosen measurement range in 4096 steps or 12 bits. Specifically designed for high loads, the AH36M rotary encoder features twin ball bearings.

Its battery-free multi turn technology and non-wearing magnetic measurement principle makes it suitable for positioning tasks in mechanically challenging work environments. Measuring 36.5 mm in diameter, the rotary encoder’s compact construction makes it ideally suited for use in applications with limited space. Although it comes in a compact design, the new AH36M rotary encoder still features a six mm hollow shaft.

Motion Control Tips

Utilizing the synchronous serial interface (SSI) standard, the new interface relays absolute rotary position information to the PLC. While the shaft is rotating at a maximum speed of 16,384 pulses per rotation, the encoder also sends a series of electronic pulses. An optional index pulse can also be transmitted once every complete rotation.

Meanwhile, the incremental pulses can be transmitted via a push/pull connection or over an RS-422/485 link. Responding to a request from the controller, the dual-personality encoders offer access to absolute rotary position information while accurately measuring the rotational velocity in real-time and making it suitable for monitoring rotating machinery or for motor control applications.

These encoders also offers other new features such as optimized diagnostic reporting through the SSI connection or through case-mounted LED’s, and an optional case-mounted push-button that enables the operator to re-set the absolute position readout’s zero-position (datum).

The new OCD encoders keeps the previous generation devices’ best features, including accuracy, highly effective shaft and connection seals (up to IP66 protection), precision (up to 216 steps per turn) and single- or multi-turn capabilities. Available in hollow, solid and hub shaft variants, the units can be supplied with a cable exit or a connector.

Motion Control Tips

The HS35 encoders are available for shaft diameters from 0.5 to 1.0 in. and can be customized further via shaft insert adapters. These isolation shaft inserts provide electrical isolation against voltages up to 2.5kV, preventing bearing corrosion and wear. The encoder’s ShaftLock system with its large diameter between ABEC5 bearings allows the shaft to reliably endure high mechanical loads even at speeds up to 5,000 rpm and 60 arcseconds or better accuracy.

The heavy-duty design of the HS35 encoders includes extra durable castings and wall structures that withstand long-term exposure to harsh environments. Dual seals, lubricants and a durable powder coating on the bearing housing and cover effectively protect against corrosion and allow operation in nearly all environmental conditions. In IP67 versions, high-performance impermeability seals protect against high-pressure wash down. Tether mounting allows for easy installation.

The HS35P offers fully programmable resolution, index, and outputs, allowing customization and minimizing encoder inventories. The resolution is PC programmable to between 1 and 8,192 ppr in increments of one. Zero pulse position/width, HTL/TTL outputs and rotational direction are also programmable. The encoder can be programmed directly via the supply line using the user-friendly software.

Designed to endure extreme mechanical strain, Baumer HS35 encoders are ideal for motor and drive control in a range of heavy duty applications including oil and gas processing, wind power, food and beverage processing, metalworking, printing, packaging, material handling, solar/PV module manufacturing, textile processing, wood/lumber processing, and heavy equipment such as cranes, hoists, elevators, and service vehicles.

For more information on Baumer’s HS35 hollow shaft incremental encoders, visit www.baumer.com/hs35.

www.baumer.com

Motion Control Tips

“The provision of an LED illuminated shaft provides integrated indication to simplify and reduce the cost of control panels by eliminating the need to fit a separate LED indicator. Our experience of manufacturing control knobs in-house puts us in a unique position to provide a range of matching translucent control knobs for our own and other suppliers illuminated rotary encoders.” Says Cliff Electronics General Manager John Hall

The rotary encoder range provides an output of 24 pulse / 24 clicks and features a 24mm shaft with ‘flats’ of 15/17.5/20/25/30mm available. Switch contacts are rated at 5VDC/0.5mA and the operating temperature range is -40° to +85° making them ideal for audio, broadcast, industrial control, medical and telecoms equipment and many types of portable devices.

Cliff Electronics
www.cliffusa.com

Motion Control Tips

Balluff’s S2E

• Provides accurate velocity and position tracking of virtually any rotary movement to monitor continuous and/or oscillating rotary shaft motion.
• Converts rotary motion into linear measurement to provide compact linear positioning information.
• Provides continuous feedback allowing PLC-directed set points and electronic cams to be established to make the operation of the host machine more flexible.

Conveyor Applications
The S2E gives a PLC the position information necessary for virtually all conveyor-based manufacturing operational functions such as multiple station error proofing with single station rejection. It also provides conveyor speed control monitoring. Position information provided by the S2E can also be used by the central PLC to develop software driven programmable cams.

Angle Control and Adjustment
The S2E provides accurate angle measurement for any apparatus that revolves around a shaft. For example, the S2E can be mounted on the spindle of a miter saw. An output signal can be sent to a digital display to give the operator an accurate visual indication of the angular position of the saw blade.

Speed Control and Monitoring
The S2E provides accurate control and monitoring of any rotating shaft such as a motor or any rotating equipment. For example, rotational positions of solar reflectors can easily be monitored by the S2E. An index pulse can be used to set home position (due East, for example). Balluff’s rotary encoder has an IP67 rating, which means it can easily withstand outdoor environments.

Balluff
www.balluff.com

Motion Control Tips

These new encoders distinguish themselves not only by their short overall length but also by their modern opto-ASIC based photoelectric scanning with integrated interpolation.  Thanks to the electrical output at TTL levels with differential signals, these encoders can be connected to almost all standard subsequent electronics for control of digitally controlled servo motors (up to edge lengths of 40 mm and 55 mm), and are useful in various applications in the Automation industry.

Currently available, the HEIDENHAIN 1023 encoder has an overall length of 35.2 mm max and an IP 64 rating, making it especially useful in hazardous environments; the HEIDENHAIN 1123 encoder has an overall length of 30.3 mm max and an IP 0 for general use.

Both encoders have mounted stator couplings and blind hollow shafts.  Choice of appropriate commutation signals is available to the buyer as the amount depends upon the number of poles of the motor to be controlled.

HEIDENHAIN
www.heidenhain.us

Motion Control Tips

As these compact Absolute ATD EtherCAT Encoders measure just 80 x 58 mm, they are ideal for use in limited space applications including robotic and automated systems.  These single or multi-turn encoders are compatible with the CANopen over EtherCAT (CoE) protocol and offer 14-bit single-turn and 16-bit multi-turn resolutions.

Because Power over EtherCAT delivers power and transmits field bus signals using just one cable, Baumer Absolute ATD PoE EtherCAT Encoders are a cost-effective alternative to expensive and complex multi-cable systems.  These encoders are especially suitable for difficult-to-access applications.

These encoders can be used on robotic arms, robotic pick-and-place systems, automated packaging lines, material handling equipment, laboratory automation equipment, medical imaging systems, printing equipment, textile processes machines, theater sets, and in other applications where cable movement and cable life are a concern.

For more information on the Absolute ATD EtherCAT Encoders, contact Baumer Ltd. at (800) 937-9336.

www.baumerelectric.com/usa

Motion Control Tips

With a standard IP67 rating, and IP69K rated versions available, end-users can take advantage of the DuraCoder’s protection against high pressure and high temperature wash downs; or liquid ingress from long-term immersion in water or contaminants. The DuraCoder product line comes standard with a 2.5” (63mm) housing and an oversized double row sealed bearing. Solid shaft and hub shaft versions are available with a variety of sizing options. Shaft loadings of up to 100 lbs. radial/50 lbs. axial provide maximum durability for applications that require superior strength. DuraCoder brand encoders are available in six different versions: SSI, Digital, Analog, Incremental, DeviceNet, and Ethernet/IP.

Applications that benefit from the stainless steel DuraCoder design include food/beverage processing, specialty vehicles, cranes, energy generation equipment, chemical/petroleum processing, wastewater treatment plants, offshore/marine environments, steel mills, and many other indoor and outdoor installations. With the ability to withstand the harshest environments, the DuraCoder remains the perfect solution for heavy-duty applications.

® DuraCoder is a registered trademark of Advanced Micro Controls Inc. (AMCI)

Advanced Micro Controls Inc.
www.amci.com

Motion Control Tips

Ethernet IP Encoders come in standard 58mm diameter housings, with a solid 10mm shaft, and clamping flange design. Diagnostic LEDs provide visual status indication to help users quickly correct problems and keep machines up and running. M12 d-coded connectors simplify operation and are used to power, and facilitate communication to and from, the encoder. Ethernet IP Encoders can be used with cable pull devices to determine linear position feedback and transmit that feedback back to the controller.

In addition to Ethernet/IP, Pepperl+Fuchs offers a complete family of encoders for CANopen-, DeviceNet-, PROFIBUS- and AS-Interface operation.

Pepperl+Fuchs
www.pepperl-fuchs.us

Motion Control Tips

The steel tape of the MSR 40 utilizes the proven Single-Field Scanning principle with 200µm grating pitch – offering ease of mounting with high achievable angular resolution. Accuracy of the system is ±30 µm/m with an operating temperature of 0 C to +50 C. With these specifications, this encoder is distinguished by its successful operation at high speeds, especially noteworthy for large measurement applications.

The novelty of the MSR 40 encoder is that it links the ends of the steel tape together with one of two joining mechanisms, depending upon the application. Measurement through a full 360° is thus possible. The MOR version uses a steel ring tensioning cleat for encoders mounted to a steel surface thus allowing for thermal expansion; the MER version uses a rubber gasket with a low-profile tensioning cleat for other mounting surfaces.

Depending on the shaft diameter, line counts of up to 20,000 are available on the MSR 40. All versions offer quasi – absolute positioning via distance-coded reference marks or homing via a single reference mark. The MSR 40 is easily mountable and is available in both standard and custom sizes. Custom orders are welcomed.

RSF Elektronik
www.rsf.at

Motion Control Tips

This encoder is available with ten pulse counts up to 5,000 PPR and with push-pull or RS422 outputs. It incorporates a proprietary Safety-Lock™ bearing assembly that has been tested to provide additional protection against vibration and installation errors.

The Sendix 5006 incremental encoder is ideal for use in a wide variety of industries, including food packaging, pharmaceutical, chemical, oil and gas, as well as other challenging applications within corrosive environments or requiring long-term durability.

TURCK
www.turck.us

Motion Control Tips

Housed in a small 4×4 mm QFN package, the low-power encoder is the smallest device in its class. Depending on the readout rate, the current consumption is reduced to µA-levels, e.g. 50µA average at 10 measurements per second – the lowest in the industry.

Only a few passive components and a magnet rotating above the chip are necessary to assemble the encoder systems. The AS5055 performs all angle calculations as well as automatic power-up and power-down on–chip. It only draws current, when a new measurement is requested by the host controller. As soon as the acquisition of a measurement is completed, the AS5055 automatically suspends to power-down.

Josef Janisch, product marketing manager at austriamicrosystems, stated, “This is the industry’s smallest 12-bit magnetic rotary encoder available. It also offers the lowest power consumption due to automatic shutdown and wake-up modes. This is ideal for battery equipment, as it extends battery life. In addition, the industry standard SPI interface offers an easy-to-use connection to common microcontrollers.”

The AS5055 is available in a tiny 4×4 mm 16-pin QFN package, operates from a 3.3 volt power supply, and has an ambient operating temperature range of -20 to +85°C.

austriamicrosystems
www.austriamicrosystems.com

Motion Control Tips

Robust, compact and simple installation of the MNI40 make it an ideal choice for a wide range of applications including machine construction, wind power, mobile equipment, material handling lifts and conveying technology. Primary features include:

• Clear indication via LED display (2-color)
• Easy installation and setup
• Quality assurance through complete self-diagnosis
• Long service life

“The LED indications are particularly useful during installation and setup because they provide information on proper assembly.” says David Rubinski, Product Manager. “The integration of the LED also reduces installation time and test equipment requirements, and offers greater potential for reducing overall costs of machine and/or system construction.” explains Rubinski.

The MNI40 utilizes a zero-contact (magnetic) connection between the encoder sensor and magnetic wheel, enabling the MNI40N encoder to measure speed without ball bearings. This eliminates bearing wear due to mechanical forces and ensures long operating life. The sensor includes sensing electronics, housed in a compact IP67 rated enclosure and an elastomer coated magnetic wheel – so contact with water and oil will not damage the encoder system.

Pepperl+Fuchs
www.pepperl-fuchs.us

Motion Control Tips

HEIDENHAIN’s safety-oriented position encoders with functional safety provide two independently formed position values via a serial EnDat interface. They are certified according to the EN ISO 13849, EN 61508 and EN 954-1 standard for performance level d, safety integrity level 2 and category 3, respectively. The EnDat 2.2 version of these new absolute rotary encoders with serial data transfer offers a singleturn resolution of 23 bits, and a multiturn resolution of 12 bits. The supply voltage range is from 3.6 V to 14 V.

Eight new rotary encoders round out HEIDENHAIN’s 1000 Series including:

–ECN 1013, ECN 1025, EQN 1025, EQN 1035, ROC 1013, ROC 1025, ROQ 1025 and ROQ 1035.

HEIDENHAIN CORPORATION
www.heidenhain.com

Motion Control Tips

The 7272 EnDat interface module directly interfaces with all Heidenhain EnDat 2.1 rotary encoders, high accuracy angle encoders, and linear scales. The module is digital, two-channel, and bidirectional; enabling it to transmit position values as well as read and update information stored in the encoder, or save new information. For high system reliability, sensor data such as application-specific parameters, compensation tables, error detection, and diagnostic capabilities are made available with this module. Several other features come standard.

EnDat position sensors are bidirectional, and thanks to the serial transmission method supported by AMCI’s 7272 module, only four signal lines are required. They are also self-commissioning, reporting all the encoder’s properties to the controller at power up. OEMs can download application specific data to the encoder’s freely definable memory area. By using the AMCI EnDat interface module, use of these valuable functions is made available through the ControlLogix PLC.

AMCI’s EnDat interface module paired with a Heidenhain EnDat encoder provides a feedback solution for all applications in motion control. Examples of applications that benefit from this pairing include machine tool, printing, and robotics.

Advanced Micro Controls Inc.
www.amci.com

Motion Control Tips

Today’s production plants use rotary encoders that are often subjected to high mechanical streses in the form of shock and vibrations as well as high temperatures. It is a fact that the cost of machinery downtime in manufacturing is often all out of proportion to the expense of a simple defective component. And since rotary encoders are key parts of modern machinery and plant control units, it makes sense to equip them with a diagnostic system which continously monitors the internal functionality, therefore providing a basis for initiating maintenance measures in good time. The LEINE & LINDE 800 Series Encoders with ADS™ has often been known to quickly and clearly detect worn-out ball bearings due to poor installation, dust contamination, moisture issues and overheating, to name a few.

Specifically, this LEINE & LINDE automatic self-diagnosis system works by internally monitoring the completeness of the rotary encoder pulses and the correct pulse sequence. Even a single counter difference is registered by the system and reported. This error is relayed as a flashing LED on the rear of the encoder housing. The time of the fault and the corresponding error code are stored in the LEINE & LINDE 800 Series rotary encoder so that the user has the opportunity to read out and analyse the error code via an RS-32 interface once the encoder has been removed. A report can also be displayed directly at the machine if additional wiring is added to an overriding system control.

Leine & Linde
www.leinelinde.com

Motion Control Tips

Conventional rotary encoders are not suitable for harsh environments where corrosive agents are found. This is the case in many industries in which the encoders are exposed to an atmosphere of moisture and chemicals. Such environments will result in corrosion of the encoders’ mechanical parts and may cause loss in operation.

Leine & Linde
www.leinelinde.com

Motion Control Tips

In response to these needs, Pepperl+Fuchs developed the RVS58S rotary encoder with functional safety that enables economical system integration. This new concept provides easier connection methods to the control system and allows it to be used in high safety category systems. Technically speaking, RVS58S incremental encoders have a sin/cos interface, 1024 or 2048 signal periods, and are thermally stabilized for high resolution interpolation. They operate at 5 VDC ±5% and deliver a maximum output frequency of 200 kHz in operating temperatures ranging from -20 °C …80 °C (253 K …353 K). They are rated to handle axial shaft loads of 40 N at maximum 6000 RPM or 10 N at maximum 12,000 RPM, and radial shaft loads of 60 N at maximum 6000 RPM or 20 N at maximum 12,000 RPM.

The industrial landscape is populated with ever faster high-performance machines, in whose environment a whole range of robots and automatic feed systems are also operating in order to ‘unload’ the operating personnel. In any application where such systems are in use and moving machinery parts are driven by high-performance systems, there is the potential for danger to the operating personnel. According to the Machine Directive and relevant safety regulations for health and safety in the workplace, even brief lapses in attention must not result in shearing, crushing and impact injuries – or worse. The preferred use of rotary encoders in such applications is to monitor rotating or swiveling components in drive systems, making them a core safety consideration in drives.

In order to keep the expense of safety measures within limits, rational safety concepts will increase in importance in the future. Consequently, in this context the functional safety of individual system components, such as rotary encoders, assumes new significance. This transpires against the background of a changing situation with regard to standards, since the standard EN 954-1, which has been binding since 1996, remains valid only up to 29.12.2009.

The deterministic approach of EN 954-1, of countering the deduced risk categories by means of an appropriate system behavior, will now be superseded by the more effective standards EN ISO 13849-1 and EN 62061. With their consideration of failure probabilities (probabilistic approach) these are also more in keeping with the requirements of modern programmable electronics, which has long been subject to the considerations of safety technology. The IEC 61508 serves as the higher-level standard for functional safety.

Since the architecture determines a significant proportion of safety costs, smart ideas can reduce these costs while even increasing the efficiency of sensor-system safety. The use of mechanisms featuring two-channel operation, without completely duplicated execution of the functional units, is an effective approach. However, even systems with two rotary encoders or a dual encoder do not necessarily have to be classified according to the new standard. In order for a sensor to receive a high safety evaluation, it must be ensured that the Safe Failure Fraction (SFF) and the degree of Diagnostic Coverage (DC) are appropriate to comply with the minimum requirements. Self-diagnosis implies that the device is able to detect its own fault conditions and then reliably communicate the same. In this way machines and control systems are able to immediately carry out a defined stoppage, before subsequent failures of any kind can lead to a dangerous situation.

Pepperl+Fuchs
www.pepperl-fuchs.com

Motion Control Tips

This Leine & Linde series supports 13-bit singleturn or 25-bit multiturn with screw terminal or miniature M12 connection. Mechanically, various shafted- and hollow-shafted versions are available. The DeviceNet™ encoder supports encoder profile revision 2 and the functionality has been fully tested in compliance with the ODVA conformance test.

Overall, fieldbus technology is rapidly gaining acceptance and integration into automation applications worldwide. Based on network topology, system requirements and performance, various types of fieldbus systems are available, all developed and supported by individual standardization organizations. The key principle of fieldbus technology is to enhance device functionality, achieve communication transparency, simplify and standardize installations, as well as limiting the installation and maintenance costs. Sensors, like encoders, with support for various fieldbus interfaces have been available for several years and are increasingly gaining in acceptance and installed market share.

www.leinelinde.com

Motion Control Tips

Furthermore, the HEIDENHAIN ExI 1100 rotary encoders with EnDat 2.1 interface feature an improved inductive scanning method, with which the singleturn resolution was increased to 18 bits (262,144 position values per revolution). This results in a higher control quality of the drive.

Servo drives with inductive rotary encoders enjoy advantages over those using resolvers in terms of positioning accuracy, speed stability and control dynamics. This is made possible by the greater control bandwidth and a significantly higher number of signal periods for the formation of the singleturn position value. The position value is produced by electronics already integrated in the encoder, and is transferred as purely digital information to the higher-level electronics over the fast bidirectional EnDat interface. As an option, the information can be transferred as an analog signal. An integrated readable and writable EEPROM makes user parameters available in the subsequent electronics at all times, enabling the encoder and its environment to self-configure over the synchronous serial interface.

The encoder’s real multiturn capability frees the system from the need to be “homed” after power interruptions or switch-on. Conventional battery-supported systems requiring regular maintenance are no longer needed. Alarm and diagnostic functions ensure high system availability rates.

www.heidenhain.com

Motion Control Tips

Coupling with “Air”
Unlike traditional encoders that require some form of shaft and bearing assembly, the NorthStar HDN and HDP encoders use magnetic coupling technology to eliminate the need for these components. The encoders are supplied with a “target” magnet in the form of a bolt or collar which can be affixed to the rotating shaft or equipment that requires position or speed sensing. In application, the target magnet need only be placed in relatively close proximity to the encoder, meaning a wide sensing envelope is possible. This allows for virtually maintenance-free operation, eliminating alignment issues that can cause coupling breakage, bearing damage, and seal wear.

Completely Sealed
Since there’s no shaft protruding from the encoder, there’s no seal. Elimination of this potential ingress point is a welcome benefit especially when dealing with washdown or very dirty environments. In addition, the electronics are completely sealed and encapsulated in a clear potting compound which allows visibility of status LED’s that monitor signal output. The encoder is rated for up to IP68 environmental protection depending upon the connector chosen.

Incremental or Absolute Output
Unlike many competitive encoders, the NorthStar HDN and HDP encoders are available in either incremental or absolute output format. Absolute single-turn resolution of 13 bits is standard on the HDN58, with a choice between analog 0-5VDC output or CAN Bus interface. Standard incremental quadrature output with or without complements is available up to 2048PPR depending upon model.

www.dynapar.com

Motion Control Tips

Blending the best technologies, the PA2-50 expands possibilities for applications requiring miniature motors with encoders. Moving beyond magnetic technology, the PA2-50 provides an impressive 50 lines per revolution before quadrature utilizing optical technology. The increased resolution comes efficiently with a battery-friendly current draw of 8mA. Operating at 2.7 to 3.3V DC, low-voltage battery applications continue running longer with more robust feedback signal reliability.

The PA2-50 raises expectations by using leading-edge technologies. By incorporating the smallest optical encoder, Avago’s AEDR 8400 provides the foundation for consistent, accurate, and high resolution that cannot be matched by magnetic encoders. Optimized for the AEDR 8400, a custom-designed code wheel maximizes the reflected light increasing the system’s efficiency and signal reliability.

PA2-50 encoders assembled to 6mm diameter coreless motors are immediately available from stock with a 24 – 48 hour turnaround.

www.MicroMo.com

Motion Control Tips

The MR316’s all-optical, totally passive design outperforms resolvers as well as conventional optical and magnetic encoders. Advantages include: wide operating range (-60°C/+150°C); outdistances copper cable; intrinsically safe and ATEX-compliant; immune to EMI/RFI and ground loops; unaffected by high magnetic fields; and radiation resistant. Mounting options include synchro clamps or panel mount.

The “passive” MR316 optically links to the “active” MR310 ZapFREEä Remote Encoder Interface (REI) Module via a single 62.5/125 multimode fiber link – up to 1000 meters (3280 feet) away. With its standard DIN-rail mount, the MR310 module is co-located with the PLC or other system interface electronics where power supply connections and conventional electrical interface connections are easily made. The module offers a wide range of standard interfaces: direct quadrature outputs (both push-pull and line driver), separate multiplier/divider quadrature outputs, two fully-programmable analog outputs (4-20mA and +/-10V), and PC-friendly RS232/RS422/RS485 serial interface. For custom applications, the MR310 firmware can be easily enhanced with additional functions and modes of operation to offload previous forms of remote processing for more efficient system operation.

Based on U.S. Patent 7,196,320, the ZapFREE™ encoders utilize telecom-proven WDM (wavelength division multiplexing) technology by assigning each internal optical path (A or B) to a wavelength so that all wavelengths/paths can be combined onto a single fiber. It was deliberate to avoid the use of multiple fibers as this tends to drive up the cost of the optical harness. A single-fiber cable is inherently more cost effective and more reliable than any multi-wire or multi-fiber or hybrid cable assembly – and easier to handle and install as well. It just doesn’t get any simpler.

www.micronor.com

Motion Control Tips

The AEDT-9140 encoder modules include a lensed LED source and a detector IC enclosed in a small plastic package. When used with a codewheel, this low-cost module series detects rotary position. Due to a highly collimated light source and a unique photodetector array, the AEDT-9140 modules are extremely tolerant to mounting misalignment. Typical industrial automation applications where the AEDT-9140 encoders can be used include industrial printers, plotters, tape drives, machine tools and industrial and factory automation equipment.

Avago’s AEDT-9140 modules have two channel quadrature outputs plus a third channel index output and are designed for use with a codewheel that has an optical radius of 11 mm (0.433 inch) for 100 to 512 CPR and 11.68 mm (0.460 inch) for 1,000 CPR. The index output is a 90 electrical degree high true index pulse which is generated once for each full rotation of the codewheel.

www.avagotech.com

Motion Control Tips