Encoder - Mostre Convegno
Transcript
Encoder - Mostre Convegno
HEIDENHAIN ITALIANA S.r.l. Encoder induttivi assoluti EQI 1331 EnDat22 full digital per applicazioni Safety SIL 3 Arienti Oscar sales manager automation division [email protected] cell. 348/4108857 Arienti Oscar March 2013 Agenda HEIDENHAIN Corporate Group – trend tecnologici Fondamenti Normativa Macchine / Fault Exclusion Panoramica encoder assoluti induttivi ECI 1xx, ExI 1130, ExI 1331 Encoder assoluti induttivi EnDat 22 Safety SIL 3 categoria 4 PLe Encoder assoluti ottici EQN 1337, EQN 1135 EnDat 22 FS Road Map Prodotti FS Arienti Oscar March 2013 Agenda HEIDENHAIN Corporate Group – trend tecnologici Fondamenti Normativa Macchine / Fault Exclusion Panoramica encoder assoluti induttivi ECI 1xx, ExI 1130, ExI 1331 Encoder assoluti induttivi EnDat 22 Safety SIL 3 categoria 4 PLe Encoder assoluti ottici EQN 1337, EQN 1135 EnDat 22 FS Road Map Prodotti FS Arienti Oscar March 2013 Basket product of HEIDENHAIN Group SUMTAK HEIDENHAIN RSF Arienti Oscar March 2013 RENCO LTN HEIDENHAIN Corporate group Numerik Jena LEINE+LINDE Feedback for application segments Materials handling ERN/ECN Printing and paper ERN/ECN Robotics EQI Packaging industry Textile industry ROD ROC ROQ EQN Arienti Oscar March 2013 Drives and motion ERN ECN EQN ROD ROC ROQ ERM EQN ROD/ROC ROQ LIDA 400 ECI/EQI LIC 4000 LS New EBI 1135 LS/LC/LIDA/LIC HEIDENHAIN ITALIANA S.r.l. Arienti Oscar March 2013 EnDat 2.2 wide basket product (types and performance levels) Feedback with High Technology suitable for entry level segments too Safety Functionality without hardware redundancy and benefit of EnDat22 full digital protocol Agenda HEIDENHAIN Corporate Group – trend tecnologici Fondamenti Normativa Macchine / Fault Exclusion Panoramica encoder assoluti induttivi ECI 1xx, ExI 1130, ExI 1331 Encoder assoluti induttivi EnDat 22 Safety SIL 3 categoria 4 PLe Encoder assoluti ottici EQN 1337, EQN 1135 EnDat 22 FS Road Map Prodotti FS Arienti Oscar March 2013 Why Safety Technology? When a machine tool is in setup mode of operation, there may be a person within the machine's work envelope. To avoid damage to persons, it must be ensured – for example - that: Stationary axes do not start moving uncontrolledly Æ Safe operating stop Driven axes move at low speed Æ Safely limited speed In Europe safety requirements are regulated by law (Machinery directive - 2006/42/EG) Standards describe "how to reach safety" New standards with improved requirements are established (IEC 61508, EN 13849 - successor of EN 954-1) Arienti Oscar March 2013 Comparison of PL and SIL Performance Level (PL - EN ISO 13849) PFHd Arienti Oscar March 2013 Probability of a dangerous failure per hour [1/h] Safety Integrity Level (SIL - EN 61508) a 10-5 to 10-4 No specific requirements b 3x10-6 to 10-5 1 c 10-6 to 3x10-6 1 d 10-7 to 10-6 2 e 10-8 to 10-7 3 SIL2 / PL “d” = usual requirement on a machine tool (corresponds to category 3 as per EN 954-1) A direct correlation of “old” categories as per EN 954-1 and the Performance Levels as per EN 13849 are possible only if the structure of the system (e.g. single-fault tolerance), the diagnostic coverage and the probability of failure are known. Note: The PFHd-value is only related to the failure of the safety function of a system not its general function. Safe Axes Arienti Oscar March 2013 No interaction between operator and machine Safety is realized via safety systems such as guard-door switches or light curtains that cut off current to the axis when a person enters the danger zone. Æ In these cases, the position encoder is not included in the safety chain and is therefore not needed for a safety-relation evaluation of the machine Interaction between operator and machine It must be ensured that the machine does not make any uncontrolled movements. In this case, position information on the axis or axes is needed in order to realize a safety function. The evaluating safety module (control, external shaft speed monitor, etc.—referred to as "control" in the following) has the task of recognizing faulty position information and responding to it accordingly. Æ Various safety strategies can be pursued depending on the topology of the axis and the evaluation capabilities of the control. In any event, both components (control and encoder) must be adjusted to each other! Position value encoder 1 Control/ subsequent electronic Position value encoder 2 Encoder Configurations for Safety-Oriented Drives Arienti Oscar March 2013 Reliable position value acquisition requires redundant position information Dual-channel redundancy can be ensured by installing two encoders per axis. Advantage: High safety Disadvantage: Additional costs safe control To reduce costs, the use of solutions with one position encoder is intended. Analog sin/cos Absolute position is not reliable. Disadvantages of analog signals Pure serial data transfer Reliable absolute position Advantages of serial data transmission (first encoders in Nov. 11 2006) Sine Cosine Pos1 + Pos2 (EnDat 2.2) safe control safe control Fault Table in EN 61800-5-2, D16 Arienti Oscar March 2013 The faults that are to be examined in encoders are listed in the standard for electrical motors EN 61800-5-2, Table D16 . The table lists both electrical and mechanical faults for various encoder types with differing interfaces. It is the responsibility of the encoder manufacturer to describe the failure behavior of the encoder for the listed fault. With this description, the control manufacturer can check whether a detection measure for the described fault is possible on the control. According to EN 13894, two essential aspects are to be considered in this regard • The probabilistic examination of a safety function requires from the encoders information on failure rates, and from the control it requires information on probabilities of detecting an encoder error. • Most target applications require a “single-fault tolerance.” The occurrence of even a single fault must not lead to a dangerous failure. Therefore, for every assumable fault there must be a detection capability. Æ Some fault events, however, practically cannot be detected by the control. One such fault is a loosening of the mechanical connection between the encoder and the motor. In a single-encoder system this fault cannot be detected in every situation (e.g. during standstill). In order to nevertheless ensure a single-fault tolerance, a fault exclusion for this fault is required Fault Exclusion – Mechanical connection of the encoder Arienti Oscar March 2013 The EN 61800-5-2, Table D16 lists the mechanical fault: Loss or loosening of attachment during motion: - sensor housing from motor chassis - sensor shaft from motor shaft Fault exclusion - depending on the characteristic of the attachment different verifications have to be done: Form Fit (e.g. bolt): no loosening of the bolt no slipping of the fixed parts no breakage of the bolt Friction Fit: safety factor (e.g. 20x) The proof of these specifications includes both calculation of the values and real testing (temperature/vibration). Also a quality system has to be installed to ensure a good workmanship. Æ All our fault exclusions of “loss or loosening of attachment“ are proofed by TÜV Süd. HEIDENHAIN gets a test report by TÜV Süd. Explanation of terms MTTF, MTTFD, FIT, DC and PFHD PFHd/PFH: Probability of a dangerous failure per hour [1/h] PFH is often used instead of PFHd. Both terms usually mean the same. FIT: Failure in time [10-9/h] Used in EN ISO 61508 The FIT value is the reciprocal of the MTTF value MTTF/MTBF: Mean time to(between) failure [h] Used in EN ISO 13849 MTTFd: Mean time to dangerous failure The MTTFd value does not itself contain any diagnosis of the values. Estimation from the MTTF value (according to EN ISO 13849): MTTFd = 2 x MTTF DC: Diagnostic coverage The DC indicates the probability with which certain faults can be detected. The percentage of non-detected faults leads to the PFHd value. Arienti Oscar March 2013 Dependency between MTTF, MTTFD, FIT, DC and PFHD Arienti Oscar March 2013 Basic principle of calculation of a safe axis and the incorporation of the encoder: PFHd_axis = PFHd_encoder + PFHd_control + PFHd_actor The PFHd value of the encoder depends both on the failure behavior of the encoder as on the diagnostic capabilities in the control PFHd for certified EnDat 2.2 Encoders: The PFHd can be entered directly. Here the catalog of measures describes in detail how to evaluate the encoder data for the safe control (see D533095). This reveals the diagnostic coverage (DC) of the control, and the PFHd value can be provided immediately to the customers. PFHD for non certified Encoders: HEIDENHAIN cannot provide a PFHd value for the encoder because the diagnostic possibilities of the control (DC) must be known. In this case, HEIDENHAIN provides the customer with a failure rate (MTTF value) for the encoder. The MTTF value includes both nonhazardous and hazardous failures of the encoder. According to EN ISO 13849, it is standard practice to assume that 50% of the faults are dangerous. MTTFd_encoder = 2 x MTTFencoder PFHd_encoder = (as per EN ISO 13849) HEIDENHAIN -Safety Related Position Encoder System Arienti Oscar March 2013 EnDat-Master: • • • Position values and error bits via two interfaces Monitoring functions Efficiency test Note: The EnDat-Master and the catalog of measures are independent to the used encoder type (linear, angle) Encoder: Two independent position values Internal monitoring Protocol formation Serial data transfer (EnDat 2.2 + HEIDENHAIN cable) Catalog of measures for safe control Agenda HEIDENHAIN Corporate Group – trend tecnologici Fondamenti Normativa Macchine / Fault Exclusion Panoramica encoder assoluti induttivi ECI 1xx, ExI 1130, ExI 1331 Encoder assoluti induttivi EnDat 22 Safety SIL 3 categoria 4 PLe Encoder assoluti ottici EQN 1337, EQN 1135 EnDat 22 FS Road Map Prodotti FS Arienti Oscar March 2013 Advantages of inductive rotary encoders Arienti Oscar March 2013 Higher resolution than in standard systems (e.g. typical resolver: 14 bits) Singleturn and multiturn: 19 bits/16bits 19 bits / 12 bits 18 bits / 12 bits 18 bits / 16 bits ECI / EQI 100 ECI / EQI 1300 ECI / EQI 1100 EBI 1100 Advantages of inductive rotary encoders Arienti Oscar March 2013 The overall length of the motor can be shorter compared with optical rotary encoders Typical overall lengths: 18 mm 39 mm 22 mm ECI 119 ECI / EQI 1300 ECI / EQI 1100 13 mm 50.5 mm EBI 1100 ExN 13xx Advantages of inductive rotary encoders Low probability of failure due to the smaller number of individual components Longer service life of inductive systems without bearings because bearing wear is excluded Starting torque of inductive systems without bearings is independent of the temperature No motor shaft currents because of galvanic isolation of housing and shaft Improved noise immunity through purely digital data transmission Possibility of diagnostics with EnDat22 Safety with EnDat22 Measurement of scanning gap with ATS (allowed during mounting at room temperature) New ExI 13xx EnDat22 SIL3 Arienti Oscar March 2013 ExI 13xx Gen. 3 with Mounting PWM 20 ATS s.w. Arienti Oscar March 2013 Advantages of Inductive Rotary Encoders Arienti Oscar March 2013 Vibration (shock) resistant absolute scanning for servo motors and torque motors 40 g 5g 5g 30 g Radial forces on the motor shaft can lead to excessive values in optical systems with bearings as the encoder is connected to the vibrating motor shaft. 5g In inductive systems without bearings there are no excessive values as there is no connection between the encoder housing and the vibrating motor shaft! 5g 5g 30 g Advantages of inductive rotary encoders Vibration 55 to 2 000 Hz (EN 60 068-2-6) Vibration measurement point M2: Vibration measurement point see D741714 Arienti Oscar March 2013 ECI / EQI 1100: EBI 1135: 30 g 30 g ECI / EQI 1300 : Generation 2.5 20 g ECI / EQI 1300 : Generation 3 60 g stator 40 g rotor ECI 119: EQI 135 30 g 30 g ExI 13xx Gen. 2.5 Technology Arienti Oscar March 2013 Modular inductive absolute encoder Resolution: 12 bit multiturn 19 bit singleturn Interface: EnDat01 with 1 Vpp EnDat21 w/o 1 Vpp (pure serial) Supply voltage range: 4.75 V … 10 V System accuracy: ± 150″ (at 20 °C) New multiturn gear box Mounting compatible version to Functional Safety – ExI 13xx Gen. 3 in preparation Vibration 55 Hz to 2000 Hz: ≤ 200 m/s2 Operating temperature: -40 °C … 115 °C old Æ new Agenda HEIDENHAIN Corporate Group – trend tecnologici Fondamenti Normativa Macchine / Fault Exclusion Panoramica encoder assoluti induttivi ECI 1xx, ExI 1130, ExI 1331 Encoder assoluti induttivi EnDat 22 Safety SIL 3 categoria 4 PLe Encoder assoluti ottici EQN 1337, EQN 1135 EnDat 22 FS Road Map Prodotti FS Arienti Oscar March 2013 ExI 13xx Gen. 3 with Technology Arienti Oscar March 2013 Modular inductive absolute encoder Resolution, absolute: 12-bit multiturn (gearbox only, no battery-buffering) 19-bit singleturn 10-bit safe position (position value 2) Interface: EnDat22 w/o 1 Vpp (pure serial) Supply voltage range: 3.6 V … 14 V System accuracy: < ± 65’’ (at 20 °C) No mechanical adjustments during mounting (no special adjustment tools necessary) Integrated / external temperature sensor via EnDat Safe Position ± 3.75° SIL 3 PLe-application PFHD 15 x 10-9 Check of the scanning gap via evaluation numbers (mounting verification) Extended scanning gap tolerance: ± 0,5 mm Vibration 55 Hz to 2000 Hz: ≤ 300 m/s2 Operating temperature: -40 °C … 115 °C ExI 13xx Gen. 3 with ExN/ExI 13xx Arienti Oscar March 2013 Common Mounting ExI 1300 Gen. 3 ExN 1300 Mating Dimensions ExI 1100 Gen. 3 with FS Technology Arienti Oscar March 2013 Modular inductive absolute encoder Mounting compatible to ExI 1100 Gen 2 and ExN 1100 FS Gen 2 Resolution, absolute: 12-bit multiturn (gearbox only, no battery-buffering) 19-bit singleturn 10-bit safe position (position value 2) Interface: EnDat22 (pure serial) Supply voltage range: 3.6 V … 14 V System accuracy: ± 120’’ (typical value at 20 °C) SIL 2 Pl d (prepared for SIL 3 Pl e application) Operating temperature: –40 °C … 110 °C Max. vibration: 30 g / max. shock: 100 g Integrated / external temperature sensor via EnDat No mechanical adjustments during mounting (no special adjustment tools necessary) Check of the scanning gap via diagnosis evaluation numbers (mounting verification) Axial scanning gap tolerance: ± 0.3 mm ExI 1100 Gen. 3 with FS Preliminary Drawing Arienti Oscar March 2013 ExI 1100 Gen. 3 with FS Common Mounting Concept Common Mounting ExI 11xx Gen. 3 EBI 11xx Gen. 2 Mating Dimensions ExN 11xx Gen. 2 ExI 1100 Gen. 3 with FS Common Mounting Concept Arienti Oscar March 2013 Agenda HEIDENHAIN Corporate Group – trend tecnologici Fondamenti Normativa Macchine / Fault Exclusion Panoramica encoder assoluti induttivi ECI 1xx, ExI 1130, ExI 1331 Encoder assoluti induttivi EnDat 22 Safety SIL 3 categoria 4 PLe Encoder assoluti ottici EQN 1337, EQN 1135 EnDat 22 FS Road Map Prodotti FS Arienti Oscar March 2013 ECN 1325 / EQN 1337 in Safety Applications The “nose“ prevents the coupling and so the encoder from turning = form fit! A 2 times safety has to be proved and is by the TÜV against overload breakage and 1.5 times against fatigue breakage! The motorshaft is expected to be made out of steel and the housing of aluminum! Arienti Oscar March 2013 Taper Shaft 65B or HUB shaft67M in FS Applications Î Taper shaft 65B in combination with materially bonding anti-rotation lock Î Bottomed hollow shaft 67M1) in combination w adhesive screw lock safe acc. to TUV Süd! 1) Limitation of the max. allowed acceleration and the minimum temperature to -30°C Arienti Oscar March 2013 Mounting Test: Shaft Connection Arienti Oscar March 2013 Taper shaft The usage of a screw with materially bonding anti-rotation lock is required for fastening the shaft! A screw is no longer delivered with the encoder! New! With this test tool 680644-01, which has to be attached to the M10, the customer has to proof the tight fit of the shaft by a torque of 5 Nm Max. torque at shaft connection = 0.5 Nm 20x security = 10 Nm (certified by TÜV Süd) 10x security = 5 Nm ( 100% test by the customer) Note: The screw with Tuflock is still delivered with ″Non-FS“ encoders! Cured! Product Information Control category / standards The encoder can be used in applications up to … PFH-value encoder + cable catalog of measures is taken into account (EnDat-Master is not included in PFH-value) Angular error for the safe position gives the maximum angular error of the safe position Arienti Oscar March 2013 Agenda HEIDENHAIN Corporate Group – trend tecnologici Fondamenti Normativa Macchine / Fault Exclusion EQN 1337 EnDat 22 FS ( Functional Safety) EQN 1135 EnDat 22 FS Road Map Prodotti FS Arienti Oscar March 2013 ECN 1123 / EQN 1135 in Safety Applications Arienti Oscar March 2013 ECN 1123 / EQN 1135 in Safety Applications Arienti Oscar March 2013 Fixing of encoder/motor shaft M3 central screw max. tightening torque of 1.2 Nm Friction lock fixing of shaft front surface Motor shaft w/ M3 thread Fixing of stator coupling Encoder: Blind hollow shaft 6 mm with positive fit element Motor: Shaft with negative fit element ECN 1123 / EQN 1135 in Safety Applications Screws from HEIDENHAIN have to be used! Arienti Oscar March 2013 Agenda HEIDENHAIN Corporate Group – trend tecnologici Fondamenti Normativa Macchine / Fault Exclusion Panoramica encoder assoluti induttivi ECI 1xx, ExI 1130, ExI 1331 Encoder assoluti induttivi EnDat 22 Safety SIL 3 categoria 4 PLe Encoder assoluti ottici EQN 1337, EQN 1135 EnDat 22 FS Road Map Prodotti FS Arienti Oscar March 2013 Schedule for Safety-Related Position Measuring Systems Encoders with EnDat 2.2 (EnDat22) for safety related applications Status ExN 4xx / 13xx c Series production 3 ExN 10xx / 11xx c Series production 3 LC 100/400 Series production 3 LC 200 Series production RCN 2000/5000/8000 Concept verified Series planed : 2. Q./2013 ECI, EQI 13xx Series production c safe in the single turn range 3 3 Arienti Oscar March 2013 Arienti Oscar March 2013 Siete i benvenuti al nostro stand per ulteriori approfondimenti. Grazie!