Microe encoders feature doubleshielded cables with twisted differential pairs. Wiring and grounding guidelines for pulsewidth modulated. The importance of this cannot be overstatedand failure to understand the implications can mean ineffective shielding. There are ground straps that can be used to clamp around the cable shield to terminate.
Noise and signal distortion considerations rotary encoders. Encoder cables how to specify the right cable dynapar. Various motor and drive manufacturers have proprietary standards for encoder cables that can be. Understanding shielded cable page 4 in practice, the purpose the shield is to conduct to ground any of the noise it has picked up. Dynapar recommends some form encoder cable shield for all applications. Now i dont know what is the use of this metal shielding. Cabling and wiring guidelines sinamics product information, 1120112 3 foreword general notes note the standard applications are not binding and do not claim to be complete regarding the circuits shown, equipping and any eventuality. These cable sets offer the appropriate dielectric strength and are also.
During highspeed rotation, bearings may isolate the shaft. This guide includes techniques for the follow topics. The drop in voltage in the wire also conducts a capacitive current to the signal conductors via stray capacitance between the conductors and the cable shielding. Green a phase, white b phase, red vcc positive power supply, black v0. It also offers high resistance, which does not provide the best path to ground. Proper shielding and grounding are essential for good servo design. The encoder meets nema 4 and requirements when ordered with the shaft seal. Shield drain connect to an electrically isolated encoder and ground at drive for best resistance to noise. The shield for the coil power lines should follow the same pattern. Magnetek r226 encoder cable engineered lifting systems. Motor cable installation motor cable installation encoderresolver cables dc power wiring dc io wiring ac power wiring ac io wiring communications cables. Following encoder wiring best practices can help avoid common pitfalls and will lead to a system that operates as expected. Wire connection of cable shielding is therefore not a.
Shielding coverage 85 % braided shield rated voltage 36 v acdc current load 2 a cable color green acc. A low capacitance twisted shielded pair cable should be used whenever using differential signals, with cable lengths in excess of 3050 ft. All emi cableshielding solutions holland shielding systems bv. It mounts directly to the main control board by means of three support standoffs and a 10pin interface connector built. Abec 7 bearings, matched thermal coefficients on critical components, and custom high efficiency optics. Shielding when having a shielded cable, it is suggest to ground the shield on one end of the cable, it most system at the drive is preferred. Importance of grounding techniques 0 5 10 15 20 25 30 35 40 45 percent used grounding 42% case shield 22% cable shielding 18% filtering 12% pcb layout 6% grounding 42% case 22% cable 18% pcb 6% filter 12%. Stepping system cables surestep cables, continued stpcbledxx encoder cable wiring diagram stpcblebxx encoder cable wiring diagram note. Like a shield used during battle, cable shielding acts as a barrier that protects the cable from external threats, such as electrical interference emi and rfi radio frequency interference. If you only ground the shield at one end on a magneto plead, the open end radiates into the vhf range and clobbers the radios. Grounding of shielding of a twisted pair cable at both. But insulation is transparent to electromagnetic energy and offers no protection.
Rockwell automation publication drivesin001qenp june 2019 7 preface this manual provides basic information to install, protect, wire, and ground. If crossing over any high voltage cables it is suggested that it crosses at a 90 angle to prevent noise transmitting onto the signal wires. Encoder cables and connectors po box 255 88864000 tampa fl 33622, usa 8002370946 or 1502 cable assemblies photocraft supplies standard and custom cable assemblies for all encoders. The goal of shielding is to prevent the wire inside the shield from radiating. Optical encoder grounding and shielding recommendations. For best performance, each individual wire should be protected. Shielding the evolution of technology maintains steady demand for sophisticated cable shielding.
We highly recommend grounding the cable shielding through the connector body or by other means. Our standard cable has a braided and foil shield, however, it is not a twisted shielded pair cable. Do not run the encoder cable over 300 long see engineering typical encoder cable standoffs we have been using magneteks r226 encoder cable pictured above to great success. The right cabling can reduce or suppress noise, delivering strong encoder signals even in a very noisy environment. Engineered lifting systems has a huge stock of these parts. Selecting the appropriate cable and devoting effort to the grounding of the encoder in the planning stage will save considerable time and expense in troubleshooting and correcting signal noise problems once the design is complete. This heavy mill duty magnetic encoder features advanced sensor technology, builtin shielding and an optional super magnetic shielding kit to resist the largest magnetic fields. Series sf cable is the right choice if you need increased flexibility for your power servo applications. Mounting brackets used to mount measuring wheels to cube and 702 series accucoderstm.
Motor cable installation motor cable installation encoder resolver cables dc power wiring dc io wiring ac power wiring ac io wiring communications cables. For wiring information on this cable, refer to 5xx absolute encoder cable assemblies. Servo design correct grounding and shielding to prevent. Use shielded cables on the input and output of a motor drive or noise. Htl encoder interface module 121524 vdc vw3a3424 qgh1764000. Connect the shield to protective ground as per the mounting instructions. See absolute series wiring of each model for pinouts. Box 249 sagle, id 838600249 usa installation and wiring guide phone. Encoders t2 option is available as a standard h20 express encoder. Shield cables and or individual wires to protect from emi. This severe duty magnetic encoder features advanced sensor technology, and the largest, widest housing for the maximum protection from external magnetic. Epc world headquarters americas division 464276 highway 95 south p. Express items highlighted with are standard express encoders and ship in one to three days.
Follow the encoder wiring scheme or pinout designated on the encoder datasheet. It comes either in continuous lengths, on a reel, or cut into lengths. Read on to discover details about when and where you should use these shielded cable types. The cable shielding and its termination must provide a lowimpedance path to ground. Beldens exclusive patented beldfoil design, with its aluminumpolyester foil. Testing report of fanuc encoder cable for servo motor f06b0001k008. Refer to shielding of brake wires within the power cable on page 9 for cable shield grounding at the servo drive. Additionally, it has a metal shielding layer in the cable. Ground connected internally to cable shieldingcustomer ref. Magnetek r226 encoder cable has double shielding, flexible, and armored for festoon applications. Pdf stability and accuracy of active shielding for. Special models of the h20 incremental encoder are available with one or more of the following certifications. Install ferrite cores at the ends of the motor cable and encoder cable.
Shielding and grounding electrical panels technical note. All cable is 28 or 30 awg, shielded, and rated to 70 c. Alpha wires series sf cables are designed specifically for servo motors and servo drives. The cable shield can be grounded at one end, or at both ends of the cable. Recommendations for emccompliant wiring of servo drivers and. These motors do not maintain multturn position and do not transmit mt bits. Mar 21, 2012 foil shielding provides 100% coverage of the conductors, but its hard to effectively terminate to connectors. Abbbailey foundation fieldbussee protocol listings on page 8. Typical applications include machine control, process control, the wood. Selecting the appropriate cable and devoting effort to the grounding of the. Tlseries servo motors 7 publication tlin003aenp june 2007 interconnect cables knowledgeable cable routing improves system electromagnetic compatibility emc. If you only ground the shield at one end on a magneto plead, the open end radiates into the. Pairs awg strand inches mm inches mm s61403cy 3 20 46 0. Grounding of shielding of a twisted pair cable at both ends.
Alpha wireindustrial series csa awm i ii servo resolver cable. Advantages of linear encoders linear encoders measure the position of linear axes without additional mechanical transfer elements. This is a custom cable made to the standards that magnetek sets, and we have yet to find a better product. Proper shielding and grounding are essential to good servo design. Note that the grounding method of the encoder cable connecting the drive unit and the motor. The most common type of shielding is a foil jacket with a drain wire. Encoder receiver option ha388867 issue 4 technical manual aerospace climate control. Supported encoder types the following encoder types are currently supported with the endat 2. One example of the latter is an unshielded encoder insulated. You can use the 4920 series cable grounding clamps.
Selecting the right cable for your application is critical but proper encoder wiring is key to building a longlasting, reliable machine. The control loop for position control with a linear encoder also includes the entire feed mechanics. Symptoms may include jumping around of encoder counts. The standard applications do not represent customerspecific solutions. Overall foil shield with shield drain wire grounded. Encoder receiver option encoder receiver option description the encoder receiver option allows incremental encoders to be connected directly to the motor controller to provide highly accurate speed feedback measurement. The wire testing machine used for testing comprehensiveness of cable like insulation then to make sure the safety of the wire to avoid short circuit or case broken. Industrial series sf flexible servo cable alpha wire. Error messages troubleshooting kuka system software kss. For high frequency applications 200khz, this type of cable may be needed for all lengths.
Applied emirfi techniques automationdirect technical support. The advantage of shielded cables is that they are less sensitive to. To order a prewired cable and connector assembly, indicate the connector style and cable length. This means that the encoder signals shield should start as close to the encoder detector circuit as possible and terminate as close to the controller connector as possible.
The drop in voltage in the wire also conducts a capacitive current to the signal conductors via stray capacitance between the conductors and the cable shield ing. Encoder special models of the h20 incremental encoder are available with one or more of the following certifications. Installation and wiring guide encoder products company. Dec 01, 2016 proper shielding and grounding are essential for good servo design. Multiturn resolution does not apply to the pmdd direct drive rotary motors. Common in europe, it provides unidirectional communication to 1. Belden meets that demand with innovative shielding and shield effectiveness testing methods to supply you with high quality, dependable cable. Foil shielding provides 100% coverage of the conductors, but its hard to effectively terminate to connectors. Choosing the appropriate cable and devoting effort to the grounding of the encoder in the planning stage will save a considerable amount of time and expense in troubleshooting and correcting signal noise problems once the design is complete. Cable shielding can be supplied as a readymade sleeve, on rolls, or as a flexible shielding tube. High quality connectors, cables, cable assemblies, and cord sets selected to optimize encoder performance. The interface protocol was expanded and the time conditions clock frequency, processing time, recovery time were optimized.
How to determine when shielded network cabling is required. The h25 offers features such as emi shielding, 40 lb. Article suitable for cable length m shielding cable type price. Obtaining a good quality signal is essential to effective encoder feedback. Encoder cable for overhead crane use engineered lifting.