User's Guide Balluff GmbH Schurwaldstrasse 9 73765 Neuhausen a.d.f. Germany Phone +49 (0) 71 58/1 73-0 Fax +49 (0) 71 58/50 10 Servicehotline +49 (0) 71 58/1 73-3 70 E-Mail: balluff@balluff.de http://www.balluff.de
Content 1 Safety Advisories 1 Safety Advisories... 2 Read this manual before installing in hazards to persons or 1.1 Intended use... 2 the sensor and placing it in equipment. This includes 1.2 Qualified personnel... 2 operation. installation of additional safety 1.3 Use and testing... 2 limit switches, emergency stop 1.4 Validity... 2 1.1 Intended use switches, and the maintaining of 2 Functional variants... 3 permissible ambient conditions. The BML displacement sensor is BML displacement sensors may 3 Characteristics and installed for use in a machine or not be used in life-saving Function... 4 system. Together with a controller systems, in aircraft, etc. 3.1 Characteristics... 4 (PLC) it comprises a displacement 3.2 Display elements... 4 measurement system and may be 1.4 Validity 3.3 Principle of operation... 4 used only for this purpose. This manual is applicable to 3.4 Interface signals... 4 Unauthorized modifications and displacement sensors of type 3.5 Reference point function... 5 non-allowed use will result in loss BML-S1A...S184/KA... 3.6 Limit switch function...5 of guarantee and warranty. 4 Installation... 6 An overview of the various 1.2 Qualified personnel versions can be found in section 4.1 Distances, tolerances... 6 10"Versions" (refer to part label). 4.2 Determining orientation... 7 This manual is intended for 4.3 Attach sensor head... 7 technical personnel who are 4.4 Attach isolator... 7 involved in installation and setup. 4.5 Glue tape... 7 4.6 Installing limit switches... 9 1.3 Use and testing 5 Wiring... 10 Prevailing safety regulations and 5.1 Cable with connector... 10 codes must be observed for using 5.2 Cable without connector... 10 the displacement sensor. In 5.3 Connecting the sense line... 10 particular, measures must be 5.4 Interfaces... 11 taken to ensure that a defect in the displacement sensor will not result 6 Startup... 12 6.1 Check connections... 12 6.2 Turn on system... 12 6.3 Check system function... 12 6.4 Regular checking... 12 6.5 Malfunction... 12 7 Accessories... 13 7.1 Limit switch magnets... 13 7.2 Adapter plate... 13 7.3 Tape cover... 13 8 Troubleshooting... 14 9 Technical Data... 15 10 Scope of Delivery... 16 11 Versions... 17 The CE Mark verifies Emission tests: that our products meet RF Emission the requirements of EN 55011 Group 1, Class A+B EC Directive Noise immunity tests: 89/336/EEC (EMC Directive) Static electricity (ESD) EN 61000-4-2 Severity level 3 and the EMC Law. Testing in our Electromagnetic fields (RFI) EMC Laboratory, which is accredited by DATech for Testing Elec- EN 61000-4-3 Severity level 3 tromagnetic Compatibility, has Fast transients (Burst) confirmed that Balluff products EN 61000-4-4 Severity level 3 meet the EMC requirements of Surge the following Generic Standards: EN 61000-4-5 Severity level 2 Line-induced noise induced by EN 61000-6-4 (emission) high-frequency fields EN 61000-6-2 (noise immunity) EN 61000-4-6 Severity level 3 Magnetic fields EN 61000-4-8 Severity level 4 2
2 Functional variants of the BML-S1A displacement sensor The BML is a non-contacting, incremental displacement measurement system which in addition to a counting function is available with a reference point and limit switch function. All functions are implemented by means of magnetic sensing.the reference position is integrated in the tape, and limit switches can be attached at any desired position. The following table show the functional variants with their possibilities. Cable type Output signal Reference signal Limit switches A/B sin/cos periodic* one none front and rear none Connector type Output signal Reference signal Limit switches A/B sin/cos periodic* one none none * not for versions with analog output System variant 1 Incremental sensors Sensor head Tape with alternating north and south poles Fig. 2-1: Displacement system with incremental sensors System variant 2 Incremental sensors Sensor head Reference point sensor Magnetic reference point Fig. 2-2: Displacement system with incremental and reference point sensors Limit switch sensors Incremental sensors Magnetic reference point System variant 3 Sensor head Reference point sensor Limit switch magnet Fig. 2-3: Displacement system with incremental, reference point and limit switch sensors 3
3 Characteristics and function 3.1 Characteristics BML displacement sensors are characterized by: High system accuracy of 10 or 20 µm High resolution of up to 1 µm High traverse speed of up to 10 m/s Position signal in real-time Very good non-linearity (up to max. ±10 µm) Insensitive to shock, vibration, and contamination such as dust and oil Wear- and maintenance-free Rugged Enclosure rating IP 67 per IEC 60529 3.2 Display elements The digital sensor head has an LED error indicator (front). Flashing indicates that no signals are being output, for example because the distance between sensor head and tape is outside the tolerance. 3.3 Principle of operation The sensing head is attached to the machine member whose position is to be determined, while the magnetic tape is mounted along the direction of travel. The tape contains alternating magnetic north- and south poles. The two incremental sensors in the sensing head measure the magnetic alternating field. As the tape is passed over without contact, the entire underside of the sensor head must always lie above the tape. The two incremental sensors in the sensor head pick up the magnetic periods so that the controller can determine the distance traveled. In order to be able to count knowing the direction of travel, the two incremental sensors are offset to each other. The sinjsoidal output signals from the two incremental sensors are phase-shifted by 90 and 270 respectively and can be interpreted as a sine and cosine signal. 3.4 Interface signals The sensing head can convert the sinusoidal and cosinusoidal signals either into A/B pulses and send them to the controller (RS422), or output the analog sine and cosine signals directly. The digital A/B pulses are interpolated in the sensing head, whereas the analog signals must be interpolated in the controller. The two digital pulses A and B are 90 phase-shifted, with the sign of the phase shift determined by the direction of travel of the sensor (Fig. 3-1). Each edge change from A or B represents a counting step for the period counter (UP/DOWN Signal A Signal B Increment Direction of motion Example counter state B (Cosine) A (Sine) Output voltage forward counter). When Signal A is ahead, the counting state increases, and when Signal B is ahead the count decreases. The controller thus always knows the incrementprecise position without having to periodically poll the sensor (realtime capability). In the case of the analog sine and cosine signals (sin+, sin, cos+, cos ) the controller evaluates the difference in the signal amplitudes and interpolates from the 4 signals the exact position within one period (FIg. 3-2). If there is movement over several periods, the controller also counts the number of periods. Fig. 3-1: Digitized sine and cosine signals with period counter backward Travel µm Fig. 3-2: Signals from sine and cosine sensor with a magnetic period of 2 mm (1 mm pole width) 4
3 Function and characteristics (cont.) 3.5 Reference point function The reference position is always required as the starting point for the count for each incremental displacement system. How the reference position is determined depends on the sensor type, the tape and on the controller. In the simplest system the sensing head with the sinusoidal and cosinusoidal sensors can count only the magnetic periods. The tape contains only one track with magnetic north and south poles (Fig. 3-3). In this case the displacement measuring system does not know the absolute position. This is determined by the controller by adding the counted increments. First however the reference position must be determined by a homing move to the reference switch. A sensing head with an additional reference point sensor can output a reference point signal as soon as it reaches the magnetically encoded reference point on the second track of the tape (Fig. 3-4). Then an reference switch is not needed. In another sensing head version a reference point signal is output with each magnetic pole. This signal is repeated every millimeter (periodic reference point). Incremental sensors The tape does not require a second track with a magnetically encoded reference point. In this case an reference switch needs to be used for the selected reference signal. The controller precisely evaluates the reference position when the switch and the reference point signal of the sensing head are active. Therefore the accuracy requirement for this switch is not especially great. Tape without reference point/with periodic reference point Fig. 3-3: Displacement system without reference point and limit switch function Incremental sensors Tape with one reference point Reference point sensor Magnetic reference point Fig. 3-4: Displacement system with reference point function 3.6 Limit switch function When limit switch functionality is needed, sensing heads can be equipped in addition with a limit switch sensor which senses opposite pole permanent magnets at the ends of the measuring range and sends the signals to the controller (Fig. 3-5). The limit switch sensors function then even if the rest of the sensor fails (security function). If the actuation range of the limit switches needs to be longer than their length (20 mm), multiple limit switches of the same type can be mounted in rows. Limit switch sensors Limit switch magnet rear Limit switch magnet front Fig. 3-5: Displacement system with limit switch function Incremental sensors 5
4 Installation Important installation notes: The permissible distance and angle tolerances as per Figs. 4-2, 4-3 and 4-4 must be strictly observed. The sensing head may not come in contact with the tape at any point along the travel. Contact must still be avoided if the stainless steel cover (optional) is used. The magnetic tape must not be subjected to strong external magnetic fields. Direct contact with holding solenoids or other permanent magnets must be avoided. The displacement measurement system must be installed in accordance with the specified enclosure rating. Insulator available only for BML-S1A1 red LED (dig. BML only) Fig. 4-1: Dimensional drawing 4.1 Distances, tolerances The following distances and tolerance must be observed when installing the sensing head and tape: The distance (air gap) between sensing head and tape as per Fig. 4-2 The horizontal offset between sensing head and tape as per Fig. 4-3 The angle tolerances as per Fig. 4-4. Any tilt along the longitudinal axis of the sensing head must still maintain the nominal distance to the tape in the center of the head. The two incremental sensors are located there on the underside. Tape Stainless steel tape cover Fig. 4-2: Permissible air gap between sensor head and tape Tape without single reference point Tape with single reference point Fig. 4-3: Permissible horizontal tolerance to right or left Fig. 4-4: Permissible angle tolerances Tape 6
4 Installation (cont.) 4.2 Determining orientation The orientation with respect to front, back, right and left is used in the installation description and is critical for correct installation of the sensing head and tape. Starting from the travel direction of the sensing head the orientations are defined in Fig. 4-5. rear left side right side Fig. 4-5: Orientation 4.3 Attach sensor head The sensor head is attached to the moving machine member using its right or left side. Drill two through-holes or threaded holes in the machine member; observe a height tolerance of 0.1 mm. To increase the tolerance, the optional adapter plate with throughholes (p. 13) can be used. The mounting type depends on the housing style: 1. The housing for model BML- S1A2... has two M3 threaded holes. Machine member Fig. 4-6: Threads in sensor head 2. The housing for model BML- S1A1... has two through-holes (4.3 mm) for M4 screws. Tap the M4 threaded holes into the machine member. Machine member Travel direction Reference point front Fig. 4-7: Threads in machine member 4.4 Attach isolator Applies only to BML-S1A1. For more severe EMC demands the sensor head can be installed completely isolated from the machine by using two isolators (Fig. 4-1). Tap two M3 holes into the machine member. Insert the two isolators right and left into the 4.3 mm holes of the sensor head. Fig. 4-8: Isolator Machine memberr Isolator Fig. 4-9: Installing isolator 4.5 Glue tape Note: Attach the tape to the mounting surface parallel to the direction of travel and completely level. Wavy or skewed tapes will affect the measuring accuracy. To prevent linearity deviations, never stretch or compress the tape. Once glued in place, a tape should not be removed (even partially). Strong non-linearity can be expected from any point which has been lifted. Keep magnetized parts away from the tape to avoid non-linear effects. An ambient temperature of 0 to 40 C is recommended for optimum adhesion. For tapes with a reference track, identify the front and rear end so that the tape can be installed appropriately to the count direction of the sensor head. The reference point is visually marked (Fig. 4-5). Installation options (Fig. 4-10): Pos. 1: For normal ambient conditions glue the tape down to a level surface. Optionally the cover band can be glued on for protection. Pos. 2: For harsh ambient conditions embed the tape fully in a somewhat deeper channel so that it does not extend over the top. Optionally the cover band can be glued on for protection. Pos. 3: For harsh ambient conditions embed the tape fully in a somewhat deeper channel and fill with non-magnetizable material (such as adhesives). The fill material can be leveled by lightly sanding. Pos. 4: Attach the tape ends, e.g. rivet or screw down the tape cover. Tape cover Tape Machine Tape cover Tape in a slot Potting material Tape in a slot Attach tape ends Fig. 4-10: Tape installation options 7
4 Installation (cont.) Attach mounting aid The mounting aid ensures that the tape can be attached without lateral offset flush with the left side of the sensor head (Fig. 4-13). Even slight deviations from the tolerance values (Fig. 4-3, 4-4) may affect the measurement results. Fig. 4-11: Mounting aid Machine member Use screws to attach mounting aid to right side of sensor head. Machine member Use screws to attach mounting aid to left side of sensor head. Fig. 4-12: Attaching mounting aid Installing the tape Note The tape must always be mounted flush with the left and right side of the sensing head. 1. If desired: Attach the mounting aid to the sensor head (Fig. 4-12). 2. Thoroughly remove any oil, grease, dust, etc. (use acetone or similar) from the mounting surface and allow to dry completely. 3. For tapes with a reference position, identify front and back end: the reference point is visually marked and is located on the right side of the tape in its own track. For the system to function the reference track of the tape must lie on the right side of the sensing head (Fig. 4-5). For tapes with no reference position no front-back orientation is required. 4. Position the sensing head at the back end of the tape (start of the measuring range). 5. Pull back the film from the back end of the tape and lightly attach the tape. 6. Remove another section of film. 7. Move the sensing head a short distance further while aligning the tape flush with the left and right side of the sensing head (Fig. 4-13). 8. Gently press the tape behind the sensing head. Caution! Do not use a hard tool, otherwise the magnetic surface may be damaged! 9. Optional: To protect the tape from mechanical and chemical effects, glue the stainless steel cover in place (details see section 7.3). 10. Remove mounting aid. Apply tape to this surface Machine member flush Mounting aid Machine member right side Sensor head extends approx. 1 mm beyond tape Mounting aid right side Apply to this nose Fig. 4-13: Attach tape flush with left side of sensor head 8
4 Installation (cont.) 4.6 Installing limit switches The front and rear limit switch magnets must always be installed on the right side of the sensing head. right side When the limit switch is in a housing, always attach the front magnet with its nose facing back and the rear magnet with its nose facing front. Limit switch magnet rear Limit switch magnet front When the limit switch is not in a housing, attach the rear magnet with the slot to the left of center and the rear magnet with the slot right of center (Fig. 4-14, 4-16). The following applies to both limit switch types: If the E-stop travel exceeds the length of the limit switch magnet, multiple magnets may be installed in a row (Fig. 4-14). The limit switch sensor becomes active as soon as it begins to enter the magnetic field of the limit switch magnet (Fig. 4-15). Limit switch magnet rear: Slot left of center Fig. 4-14: Installing the limit switch magnets Limit switch magnet front: Slot right of center The limit switch becomes active at about this position E-stop travel Travel (measuring area) E-stop travel Fig. 4-15: Travel and E-stop distances for limit switches with and without housing Limit switch glued to machine Maintain distance from mounting surface. Tape Fig. 4-16: Installation example: Limit switch without housing 9
5 Wiring Note the following when making electrical connections: The system and the control cabinet must be at the same ground potential. To ensure EMC, which Balluff confirms with the CE Marking, the following instructions must be followed. The cable shield must be grounded on the controller side, i.e., connect to the protection ground. The connection on the sensor side depends on the configuration. For enhanced EMC requirements (e.g., commutator of an electric motor), isolate the sensing head from the machine (Fig. 4-1). When routing the cable between the transducer, controller and power supply avoid proximity to high-voltage lines due to noise coupling. Especially critical are stray coupling caused by AC harmonics (e.g., from phase controls), against which the cable shield offers little protection. Cable length max. 20 m; conductor cross-section min. 0.14 mm 2, max. 0.5 mm 2. Longer cables may be used if their construction, shielding and routing resist external noise fields. Important: In spite of a voltage drop in the line a nominal operating voltage of 5 V ±5% must be ensured (see Section 5.3). 5.1 Cable with connector View of female side of connector BKS-S184-PU- Signal Pin Cable digital analog 1 WH white A A (sin) 2 BN brown /A /A ( sin) 3 GN green B B (cos) 4 YE yellow /B /B( cos) 5 GY gray Z Z 6 PK pink /Z /Z 7 BU blue GND 8 RD red +5 V 5.2 Cable without connector 12-conductor cable with Sense line (measurement line) for preventing voltage drop in the incoming line. Signal Cable digital analog WH white A A (sin) BN brown /A /A ( sin) GN green B B (cos) YE yellow /B /B( cos) GY gray Z Z PK pink /Z /Z BU blue GND RD red +5 V BK black GND Sense VT violet +5 V Sense GYPK gray/pink Limit switch front RDBU red/blue Limit switch rear 5.3 Connecting the Sense line To avoid a voltage drop in the line a regulated power supply with Sense input should be used (Fig. 5-1). If that is not possible or desired, the Sense lines in the 12-conductor cable should be connected parallel to the +5 V and GND line (Fig. 5-2). Power supply Fig. 5-1: Power supply with sense line Power supply Fig. 5-2: Power supply without Sense line Calculating the voltage drop in the line The supply voltage must be 5 V ±5%. The power supply must ensure this voltage and also compensate for the voltage drop in the line. Use the following formula to calculate the voltage drop in the line: U line = R l x l x [n x 3.1/R st + 0.03] where: U line = Voltage drop in the line in Volt R l = 0.23 for the cable version BML-...-KA and parallel wiring of the Sense lines with the supply lines (Fig. 5-2) 0.26 for cable with integrated connector BKS-S184-PU l = Cable length in m n = 3, if the reference pulse is processed in the controller 2, if the reference pulse is not processed in the controller R st = Input impedance of the controller in Ohm Sample calculation Under the following conditions: cable length 5 m Reference pulse is evaluated Control input impedance = 120 Ω Resulting voltage drop is: U line = 0.26 x 5 x [3 x 3.1/120 + 0.03] = 0.116 V 10
5 Wiring (cont.) 5.4 Interfaces Analog incremental measuring system The sensor sends the measured variable to the controller as an analog sine-cosine differential signal with an amplitude of approx. 1 Vpp (peak-to-peak value) in the nominal range. The signalsd remain low-frequence even during rapid movement. To ensure noise-free transmission, the permissible maximum cable length is 20 m. Signal period 360 el. Digital incremental system The sensor transmits the measured variable to the controller as a digital differential voltage signal (RS422). The edge separation A/B corresponds to the resolution of the sensing head. Signal period 360 el. Edge separation Reference pulse Circuit for reference position Depending on the model, the sensor sends either no reference signal, a single reference signal which is magnetically encoded in the tape, or a periodic reference signal (period = 1 mm, width of the reference signal for the digital BML S1Ax-Q = 90 electrical, for the analog BML S1Ax-A = 180 electrical). In the latter case an external reference switch must be attached to the desired reference signal. The accuracy requirements of this switch are not especially high. Note: The reference signals from the limit switch area are not allowed to be processed. Reference mark Fig. 5-3: Analog output signals el. Fig. 5-5: Digital output signals A-channel el. External switch Reference signal for the controller Fig. 5-7: Reference position circuit A-channel B-channel B-channel Reference channel Circuit for limit switches front and back The opposite poled permanent magnets at the ends of the measuring range are each sensed by a limit switch sensor. The sensor has a normally closed function, so that cable break can be detected. Controller Reference channel Fig. 5-6: Following electronics circuit for digital output Fig. 5-8: Limit switch circuit Limit switch front Limit switch rear Rear limit switch Fig. 5-4: Following electronics circuit for analog output Front limit switch Fig. 5-9: Limit switch signals 11
5 Wiring (cont.) Relationship between mechanical resolution and max. frequency The controller must be able to count the minimum time-based edge separations shown in the table (note the counting frequency of your controller). Resolution (µm) min. possible edge separation (µs) at selected V max = 1 m/s at selected V max = 10 m/s 1 0.58 0.12 (V max = 5.2 m/s) 2 1.26 0.12 5 3.0 0.29 10 3.0 0.29 6 Startup 6.1 Check connections Caution! The connections are not protected against polarity reversal or short circuit! Before turning on power, check the connections carefully to prevent components from being destroyed by incorrect connections or overvoltage. 6.2 Turn on system Bear in mind that the system may make an uncontrolled move when first powered up, especially at initial startup and if the displacement sensor is part of a control system whose parameters are not yet set. Therefore be sure that no hazards could result from an unpredictable start. 6.3 Check system function After installing the transducer system or replacing the sensing head, check all functions as follows: 1. Turn on power to the sensing head. 2. Move the sensing head along the entire measuring range. 3. Check whether all signals are output. 4. Check whether the count direction agrees with the direction of travel. If not, reverse connections A and /A. 6.4 Regular checking The functionality of the transducer system and all its associated components should be checked and logged at regular intervals. 6.5 Malfunction If there is any indication that the transducer system is not functioning properly, remove it from service and secure it against unauthorized use (see also Troubleshooting). 12
7 Accessories (order separately) 7.1 Limit switch magnets (BML-Z0002) The magnets can be used with or without housing. The through-holes make it easy to precisely install these limit switch magnets. It is fitted with a magnet only on the side facing the sensor. The space-saving magnets can be glued or attached using customersupplied holders. The upper side is marked with a notch. If the E-stop travel exceeds the length of the limit switch magnet, multiple magnets may be installed in a row (for installation see 4.6). The scope of delivery includes: 2 magnets with housing 2 magnets without housing. 7.2 Adapter plate (BML-Z0005) The adapter plate allows you to set the vertical distance from the tape. It can be attached on the left or right of the sensor head. Note: When using the two isolators, insert them directly onto the housing of the sensor head. Then tighten down the adapter plate. Fig. 7-2: Adapter plate 7.3 Tape cover To prevent damage to the tape from things like chips or chemicals, it may be covered with a strip of stainless steel. Note that the permissible air gap between the sensing head and tape is reduced now by the thickness of the cover strip with adhesive film (0.15 mm) (Fig. 4-2). Before adhering the cover strip, thoroughly clean the surface of the tape (acetone, terpentine, mild plastic cleaner, no gasoline). Ship configurations: 1 Tape cover and tape can be ordered together in the appropriate length. See ordering code p. 19. 2 The tape cover may be ordered in 3 defined lengths. See ordering code p. 18. Fig. 7-1: Magnets and housing Set distance from sensor head to tape 1. Tighten down the adapter plate to the sensor head. 2. Attach the adapter plate to the machine member. Do now tighten the screws. 3. Insert a gauge (0.1 mm) between the sensor had and tape. 4. Place the sensor head on the gauge and tighten down the adapter plate. 5. Remove the gauge. Machine member Adapter plate Tape Gauge 0.1 mm Fig. 7-3: Height adjustment with adapter plate 13
8 Troubleshooting Problem Possible causes Remedy/Explanation The controller is not getting Necessary supply voltage not When turning on the system, the (in places) any information. present LED (digital BML only) must come on briefly. Otherwise check whether voltage is present and the BML is properly connected. The voltage drop is too high (see formula page 10) Lines are not properly connected The system must have a supply voltage olf 5 V ±5%. Check the voltage across the Sense line or check the formula (page 10). Check connections according to the wiring diagrams. The orientation of the tape with respect to the reference point is incorrect. The reference point marking must be located on the right side of the sensor head (Fig. 4-5). Replace tape. The controller is getting no travel The distance between the sensor Adjust the height of the sensor information at certain points. head and tape is (in parts) head. To check, manuall move incorrect. the head over the entire range; the LED should never come on (digital BML only). The magnetic poles of the tape are in parts damaged by strong magnets. The LED will flash in the damaged areas (digital BML only). Replace tape. Limit switches not switching The distance between the limit Check the distance and angle to correctly. switch magnets and sensor head the tape (Figs. 4-14, 4-16) and is incorrect. correct. The limit switch magnets are attached with the wrong side facing the sensor head (wrong polarity) Check position of the limit switch magnets with respect to the travel direction (Fig. 4-15) and correct. Reference point signal is not The orientation of the tape to The reference point marking must output the reference point is wrong. be located on the right side of the sensor head (Fig. 4-5). Replace tape. The linearity deviation lies outside The sensor head is not moving Correctly position the sensor head the tolerance. parallel to the tape (tolerance (Section 4). see Fig. 4-4). The distance between the sensor head and tape is too great. 14
9 Technical Data Electrical data Model BML-S1A_-Q Model BML-S1A_-A Output digital RS422 analog 1 Vpp Output signal A-Signal, B-Signal, reference signal Sine, cosine, reference signal Reference signal by type None, one, periodic signal None, one Resolution 1 µm, 2 µm, 5 µm, or 10 µm Processing-dependent Output voltage Differential signal per RS422 1 Vpp Limit switches U max = 28 V, I max = 20 ma, N.C., U max = 28 V, I max = 20 ma, N.C., GND switching (cable break mon.) GND switching (cable break mon.) System resolution Dep. on tape ±10 µm, ±20 µm Depending on tape ±10 µm, ±20 µm Hysteresis 1 to 5 µm 1 to 5 µm depending on air gap max. non-linearity of the pro- ±2 µm Processing-dependent cessing electronics unidirectional max. non-linearity of the overall Depending on tape ±10 µm or Depending on tape ±10 µm or system (sensor head + tape) ±20 µm within any meter ±20 µm within any meter Temperature coefficient 10.5 x 10-6 K -1 10.5 x 10-6 K -1 of overall system such as steel Max. traverse speed Depending on model 1 m/s, 10 m/s >10 m/s Reverse polarity protected no no Overvoltage protection no no Operating voltage 5 V ±5% 5 V ±5% Current draw <50 ma + draw of controller <50 ma + draw of controller at 5 V operating voltage Error indicator LED no Shock rating 100 g/6 ms 100 g/6 ms per IEC 60068-2-27 1 Continuous shock 100 g/2 ms 100 g/2 ms per IEC 60068-2-29 1 Vibration rating 12 g, 10...2000 Hz 12 g, 10...2000 Hz per IEC 60068-2-6 1 Ambient conditions Operating temperature Cable version 20 C...80 C 20 C...80 C Connector version 25 C...70 C 25 C...70 C Storage temperature Cable version 30 C...85 C 30 C...85 C Connector version 25 C...70 C 25 C...70 C Enclosure rating per IEC 60529 IP67 IP67 Mechanical data Sensor head to tape gap 0.01...0.35 mm 0.01...0.35 mm Housing material Die-cast zinc Die-cast zinc Connection type 8-pin connector or 12-conductor 8-pin connector or 12-conductor cable cable Weight 25 g 25 g 1 Individually determined according to Balluff Factory Standard 15
9 Technical Data (cont.) Cable and connector data Cable with connector (BKS-S184...) Cable Typ M9 connector with 8-conductor 12-conductor PU cable, drag chain PU cable, drag chain capable capable Tempeature range, connector 25...70 C Operating temperature Dynamic 25...70 C 20...80 C Fixed 25...70 C 40...90 C Cable diameter 5.3 +0.3 mm 5.4 ±0.2 mm Cable bending radius Dynamic 80 mm 81 mm Fixed 40 mm 41 mm Tape BML-M01-... Accuracy class ±18 µm Thickness without cover strip 1.75 ±0.05 mm with cover strip 1.90 ±0.05 mm Width 10 mm Length depending on tape type max. 24 m Pole width (distance north-south pole) 1 mm Single reference mark optional max. non-linearity ±8 µm or ±18 µm within any one meter Weight 70 g/m Recommended operating temperature 0...40 C Chemical resistance Resistant to oils (motor oil, transmission fluid, hydraulic fluid), terpentine, antifreeze, water, kerosene. Not resistant to aromatic and chlorinated hydrocarbons, ketones, inorganic acids 10 Scope of delivery Sensor head Installation aid 2 isolators, BML-S1A1 only Short Guide Cover strip BML-A... Thickness Width Length approx. 0.15 mm (incl. adhesive film) 10 mm Same as tape length, or fixed lengths Limit switch magnet BML-Z0002 Dimensions L x B x H Magnet housing Limit switch magnet 20 x 12 x 7 mm 20 x 2 x 5 mm 16
11 Versions Ordering code for sensor head with digital square wave signal RS422 (specs on part label) BML - S1 A 1 - Q 6 1 D - M 3 1 3-10 -KA05 (example) Connection type: S184 = Connector KA05 = 5m cable max. traverse speed: 1 = 1 m/s 2 = 10 m/s Limit switches 0 = no limit switch 3 = two limit switches Reference signal 0 = no signal 1 = one signal 2 = periodic signal Pole width 3 = 1 mm Resolution (A/B edge-to-edge) D = 1 µm E = 2 µm F = 5 µm G = 10 µm Output voltage 1 = digital square wave RS422 Operating voltage 6 = 5 V Mounting 1 = Through-hole 4.3 mm 2 = M3 thread 17
11 Versions (cont.) Ordering code foe sensor head with sinusoidal analog signal sin/cos 1 Vpp (specs on part label) BML - S1 A 1 - A 6 2 Z - M 3 1 3-90 - KA05 (example) Connection type: S184 = Connector KA05 = Cable 5 m max. traverse speed: 9 = >10 m/s Limit switches 0 = no limit switch 3 = two limit switches Reference signal 0 = no signal 1 = one signal Pole width 3 = 1 mm Resolution Z = not relevant Output voltage 2 = analog 1 Vpp Operating voltage 6 = 5 V Output signal A = analog sin/cos Mounting 1 = Through-hole 4.3 mm 2 = M3 thread Ordering code for tape cover without tape BML - A 0 1 3 - T 0500 (example) Available lengths: 0500 = 5 m 1000 = 10 m 2400 = 24 m Form factor, width 01 = incremental 10 mm wide Ordering code for connector cable (M9) (specs on part label) BKS-S184-PU-05 (example) Cable length: xx = xx m (in this example 5m) Possible cable lengths: 2, 5, 10 m 18
11 Versions (cont.) Ordering code for factory assembled tape, optional with cover (specs on packaging) BML - M 0 1 - I 3 4 - A3 - M 0106 - R 0020 (example) Ordering code for roll tape, without cover (specs on packaging) BML - M 0 1 - I 3 4 - A0 - T 0500 - R 0000 (example) Reference point position only for single reference signal in head: xxxx = for xxxx cm from rear (in example 20 cm*) 0000 = no reference point or periodic reference point Length in cm: Order length = effective measuring range + 6 cm (here 100 + 6 cm) Tape cover: 0 = without tape cover 3 = with tape cover Accuracy class: 4 = 8 µm (overall accuracy ±10 µm) 5 = 18 µm (overall accuracy ±20 µm) Pole width 3 = 1 mm Type I = incremental Form factor 01 = linear, incremental 10 mm wide *Physically the reference point in the example is at approx. 25 cm measured from the start of the tape: 3 cm = front half of the unusable areas of 6 cm +2 cm = distance between incremental and reference point sensor +20 cm = reference point position within the measuring range Reference point position: 0000 = no reference point possible Available lengths: 0500 = 5 m 1000 = 10 m 2400 = 24 m Accuracy class: 4 = 8 µm (overall accuracy ±10 µm) 5 = 18 µm (overall accuracy ±20 µm) Pole width 3 = 1 mm Type I = incremental Form factor 01 = linear, incremental 10 mm wide No. 841 532-726 E 01.105886 Edition 0601; Specifications subject to change Replaces Edition 0505 19