- Welotec GmbH
Contents
1. WeLOTec Contents 1 Safety instructions 3 2 Introduction 4 3 Functional principle 5 4 Mounting instructions 6 5 Application hints 11 User Manual 6 Teaching the OWLF 15 Laser Distance Sensor 7 Alarm output 32 8 Synchronization input 33 9 Technical data 37 OWLF series 10 Connection diagram and pin assignment 40 11 Grounding concept 41 12 Service notes 42 13 Accessories 43 14 Troubleshooting 44 Welotec GmbH Zum Hagenbach 7 D 48366 Laer www welotec com info welotec com Fon 49 0 2554 9130 00 Fax 49 0 2554 9130 10 Seite Page 2 1 Safety instruction 2 Introduction Laser safety The laser diode installed in the OWLF emits visible red laser lights This laser belongs to the Class 2 laser standard specified by the IEC 60825 1 2001 It also complies with 21 CFR 1040 10 and 1040 11 except for deviation pursuant to laser notice No 50 July 2001 Max average output power lt 1 mW Laser radiation do not stare into beam To avoid uncontrolled laser exposure we recommended stopping the beam with a matte object For laser safety reasons the voltage supply of the sensors must be turned off when the whole system or the machine is turned off Safety concept information and limiting parameters as published in the sales documentation apply at all times Seite Page 3 CAUTION LASER RADIATION DO NOT STARE INTO BEAM LASERDIODE Class 2 LASER Product The latest generation of laser dist2. 9 Technical data 4007 FS S1 L 4013 FS S1 L 4030 FS S1 L 4060 FS S1 L 4100 FS S1 L 4100 FA S1 L Measuring range 30 70mm_ 30 130mm_ 50 300mm 100 600 mm 200 1000 mm 200 1000 mm Min Teach in range 22mm Resolution Linearity error gt 3 mm 2 5 mm gt 10 mm 4 20 um 5 60um 0 01 0 33 mm 0 015 0 67mm 2 15 200 0 03 1 0 0 05 2 0 gt 20mm 0 12 3 0 mm 0 02 0 5 mm Response time 300 900 us 300 900 us 300 900 us 300 900 ue 300 2700 us Ambient light lt 50k Lux lt 40k Lux lt 10k Lux lt 5k Lux lt 10k Lux Typ Temperature coefficient 3 Light source Laser class 0 015 v MB C 0 03 v MB C 0 03 Vv MB C 0 03 v MB C 0 48 12 0 0 08 2 0 mm mm 0 05 v MB C 0 02 v MB C Laser diode red pulsed Wave length Laser line hi width Analog output gh Load resistor Uout 675 nm 2mm 4 12 mm 5 5 21 mm 2 5mm 2 5mm 4 20 mA and0 10V gt 100 kQ 2mm 1 0 2 mm 3 5 mm 2 1 mm 2mm 8 5 35 mm 2 5mm 6 20 mm 2 5mm Load resistor lou Alarm output lt Vs 6 V 0 02A PNP max 100 mA Voltage supply range Supply current 12 28 VDC lt 120 mA bei 24V 40mA Seite Page 37 WE E Reverse polarity protection 4007 FS S1 L 4013 FS S1 L 4030 FS S1 L 4060 FS S1 L 4100 FS S1 L 4100 FA S1 L Short circuit protection Die cast zinc yes voltage supply only y
3. Pulse lengths on external teach input for second position Delays between teach signal and t10 response on alarm output at the rising edge of the signal Delay between teach signal and t11 response on alarm output at the falling edge of the signal Minimum blinking time for the t12 reset to factory settings with 10s button Blinking time after reset to factory settings Minimum blinking time for the t14 reset to factory settings with 10s external teach input Minimum high time of the external up teach input after the alarm output has been set at the end of the setting of the factory settings 30 2000 ms lt 20 ms lt 10ms As long as the button is down or t13 the external teach input is high gt 0 2s 0 2 s Seite Page 31 7 Alarm output The alarm output indicates when an object is outside the measuring range or when the received signal cannot be used for measuring distance In this case the output shows 0 V 4 mA The sensor has no internal hold function if measured values are missing It provides real time measuring In some critical applications poorly reflective objects the sensor sometimes loses the signal and the output signal drops down to 0 V 4 mA For such applications we recommend to use the alarm output Before reading the analog signal observe the alarm output if it is active the analog signal must be invalid Seite Page 32 8 Synchronization
4. a changing contrast color edge half of the spot will be reflected well and the other part not so well This produces a signal on the receiver that can not be analyzed perfectly and causes a measuring fault Whole spot reflected with the same reflectivity gt accurate measurement Spot on acolor edge gt measuring fault GI Seite Page 12 Often objects have several color edges on the surface for example text pictures grooves marble Measure with ae See ap od 3 W Laser Sensors e CS ial be A EE In the field you have no guarantee that the spot is not falling on just a color edge that can cause a measuring fault Also when the object moves you may get an incorrect signal for each color edge it appears that the signal is unstable or has spikes In such cases we suggest to move the object or sensor take several measurment values and calculate the average The quantity of measurment values depends on the structure the moving speed and the accuracy you desire Other possible solutions gt use a sensor with the laser line OWLFxxxxS1 L gt contact Welotec Seite Page 13 What can you do if you have transparent semi transparent and highly reflective objects The measuring principle desires an object that reflects the light diffusely Semi transparent transpar ent and highly reflective objects do not have this feature When measuring on semi transparent objects the l
5. distance mm Seite Page 19 Seite Page 20 OWLF 4100 FA S1 L Typical resolution Typical linearity error MR taught measuring range MR taught measuring range 35 15 0 3 0 Pa 10 0 pe a mF a E 2 5 Ba E e MA Son ran e S a Fa pa Ji MR 400 mm aA SN E 2 0 E S a E Fa ZS 0 0 u De 2 a 5 D 16 MA 800 mm el a ET m MIR 400 nmr 8 0 5 2 10 0 SS P 0 0 eA OD eer 15 0 200 400 600 800 1000 200 400 600 800 1000 measuring distance mm measuring distance mm Seite Page 21 OWLF 4100 FS S1 L Typical resolution Typical linearity error MR taught measuring range MR taught measuring range VIR 800 mm MIR 600 mm MR 400 mm MIR 200 mm resolution mm linerarity error mm w MA lt 100 mm 200 400 600 800 1000 measuring distance mm measuring distance mm Seite Page 22 6 1 How to teach a new range using the teach button Teaching a new measuring range Within 5 minutes after power up the button may be used to teach a new range After finishing a teach procedure the 5 minutes starts again After the 5 minutes the sensor does not respond to pressing the button Seven steps to teaching a new measuring range Press and hold the button The red LED will turn on if the sensor can be taught Hold down the button for 5 more sec The LED will start to blink Release the button Place a target at the first new p
6. mounting a sensor be aware that no laser spot from another sensor is in the receiving field When mounted side by side as shown in the picture in the middle sensing distances up to 600 mm can be achieved mutual optical interferences If it is not possible to mount the sensors the correct way use the sync input and choose the asyn chronous function Seite Page 10 5 Application hints To reach the maximum accuracy of OWLFxxx series laser distance sensors keep an eye on the following points Measuring on rough surfaces All laser distance sensors are adjusted and linearized on a reference object The object is a white ceramic sheet with an absolutely flat surface Many objects have a surface structure that is within the resolution of the sensor or rougher In such a case the sensor with its small laser spot measures the distance including the structure in contrast to a slide gauge that measures an average For such applications we recommend to use a laser distance sensor with a laser line OWLF 4xxx S1 L Flat surface distance max min Il Rough surface Slide gauge Seite Page 11 What can you do if you have color edges For a high accuracy measurement it is necessary that the laser spot reflects constantly and diffusely Frequently the object surface has different colors black white transition or parts with different reflectivity marble plate If the laser spot falls just on
7. the factory settings After finishing a teach procedure the 5 minutes starts again After the 5 minutes the sensor does not respond to the button 1 Push the button The red LED will turn on if the sensor can be taught Hold down the button further 5 sec The LED will start to blink DO NOT RELEASE the button now Wait another 10 sec until the LED is ON without blinking Factory settings have been re stored to the sensor 3 Release the button 2 ri 1 p Until button has been C ie released 113 red LED TLL Seite Page 25 6 3 How to teach a new range using the external teach input Teaching the sensor via the external teach input is equivalent to the teaching procedure via the button There is no 5 min time limit The sensor may be taught at any time In addition to the LED the alarm output is used to indicate the state of the sensor for an external digital controller L iler Ei muse SUUN FOUL Ke e l l gt i o Alarm output t10 4 l Seite Page 26 Delay between teach signal and response on alarm output l ll external teach input t10 d l _ gt l 1 Sa t11 alarm output i a l l Input circuit teach in low 0 2V high 12 28V 27kO 10kOQ 3V3 Seite Page 27 6 4 How to reset the factory settings using the external teach input Teaching the sensor via the external teach input is equivalent to the teaching procedure via the b
8. 2 mm E yt a i a S MR20mm 237 be Ka E 40 pene nen m 6 Pl nr MR3 mm K J e eene enee es wem da SE a 14 A 2 e E m 3 Bi e a 5 ae T Dag e wv MIR 10 mim ae E ee Dese EE S MR50mm_ eg 50 fad ZS 5 Sege H gege e EE d wn S 30 Leg 100 ae MR 2 mm 60 ie MR 25 mm a 150 Bed __ pe ps e SS SS Se SSS SS Ps pm we Se e j bm VW pe 200 T 30 40 50 60 70 30 Ki a SI We a MR3mm 250 measuring distance mm measuring distance mm 30 55 Kl 105 130 30 50 T0 30 110 130 measuring distance mm measuring distance mm Seite Page 17 Seite Page 18 Typical resolution Typical linearity error Typical resolution Typical linearity error MR taught measuring range MR taught measuring range MR taught measuring range MR taught measuring range 0 35 1 50 0 30 2 50 Pa e 0 70 2 00 d 0 30 o 1 00 em eng ze E wa 0 60 S SS S Bin e e E E 1 00 M PO mm me eg E d E DER eS m ee E 0 50 S i e 0 20 z MR 100 emm j o 000 z227 MA5 mm 5 0 40 S 5 0 00 E Ae 0 15 MR 750 mmr E G 0 30 MIR 500 mm p d z gege T ven Mitten o Leg S A0 S ME S75 ren SC S 100 2 0 10 S 0 20 MR 375 mm gt MR 100 a 1 00 4 Fi 250 mm a rk a 1 50 Au 2 EE Weu re a 0 10 VAR 10 mm 2 00 Ve SS MR 50 mm MR 100 mm nmn 7 MR 5 mm 1 50 a ie 100 225 350 475 600 0 50 100 150 200 250 300 50 113 15 238 300 iig ER D we e aii measuring distance mm measuring distance mm measuring distance mm measuring
9. ance sensors are setting new standards in terms of speed and performance The short response time 300 900us makes it possible to measure small and fast moving objects up to 600 mm away and 0 3 2 7ms up to 1000 mm away The advanced teach in function allows arbitrarily configuring the measuring range between the default limits in order to increase the resolution This allows the complete output swing of 4 20 mA and 0 10 V to be mapped on the new range The alarm output switches on as soon as the sensor receives no usable signal or as soon as the object is outside the measuring range The sync output allows the sensor to synchronize the measurement or to use several sensors in a non synchronous mode when they would normally interfere optically or to synchronize sensors to a machine clock or pulse The distance measurement is based on the triangulation principal The use of a photodiode array as the receiver and the intelligence of a high performance microcontroller produce measuring results that are almost independent of object colors and just a very small linearity error in the analog output signal The rugged sensor has a metal housing with a front cover made of glass The 90 rotating connecter allows wiring the sensor from the bottom or the rear Seite Page 4 3 Functional principle The distance measured is based on the triangulation principle The emitted laser beam falls on the object as a small light spot and w
10. bjects reflect well enough to enable a less than half the sampling of interval T3 Only very dark objects actually need the maximum sampling interval Seite Page 34 Several sensors in non synchronous use To prevent a negative mutual influence using several OWLF the sensor can be used with a non synchronous trigger pulse 12 28 V must be applied to the sync input so that the laser will be turned off The following timing has to be obtained S1 sensor 1 S2 sensor 2 12 28 V synch input S1 OV 20 mA lt lt _ gt analog output S1 4mA gt _ gt H gt Y l 12 28 V synch input S2 OV 20 mA ma NANS s A mA cl analog output S2 Seite Page 35 OWLF 4007 4013 4030 4060 FA S1 L 0 5 2 7ms OWLF 4100 FA S1 L 0 5 8 1ms OWLF 4100 FS S1 L t1 is the max time after a high signal on the synch input of S1 until the analog value will be held This value will be held as long the signal on the synch input is high The min time between the high signal of S1 and the low signal of S2 is t1 also In this case an optical influence between the sensors is not possible t2 is the time until the analog signal is ready after a low signal on the synch input of S2 This time depends on the reflectivity of the object and if the reflectivity changes during the hold time Input circuit sync in low 0 2V high 12 28V 27KQ 10kQ 3V3 Seite Page 36
11. es Aluminum Tightening torque x1 1 0 Nm 0 50 C and 2 measured on white ceramic sheet i the response time depends on the reflectivity of the object max sunlight on a white measuring surface Si S xx of full scale measuring range C 6 and dimension of laser beam OWLF 4xxx diameter range measuring 1 5 Nm IP 67 non condensing OWLF 4xxx L size laser beam Seite Page 38 Dimensions OWLF 4xxx FS S1 L 206 M12 x 1 OWLF 4100 FA S1 L 50 FH wi 30 1 5 90 Laser beam emitter axis 16 mm Seite Page 39 LED Teach in 10 Connection diagram and pin assignment Connection diagram Pin assignment e analog 4 20 mA s 2 n c 1 e analog H O10 V analog 4 20 mA 3 sync in 8 o aarm e teacn in e SYNEM IF OW Seite Page 40 teach in 4 alarm 5 analog 0 10 v ID 11 Grounding concept 12 Service notes For maximum EMC protection and reliable application use a shielded cable Also the sensor has to The OWLF requires no maintenance apart from keeping the front windows clean Dust or fingerprints be grounded can impair the sensor function It is normally sufficient to wipe the windows dry with a clean soft We recommend the grounding concept as shown in the picture Ground the sensor with a toothed cloth Alcohol or soapy water may be used for heavy soiling washer between the
12. ight enters the object and so the measured distance is larger than the actual distance is Light will pass through a transparent object so a measuring signal is not available A highly reflective object only has a direct reflection and it is not possible to work with it For such an application ask Welotec gt to measure these objects it is only possible if you place a diffuse reflecting surface on the object sticker etc L Be Transparent objects Highly reflective objects Only direct reflection gt No measurmentis possible Semi transparent objects the light enters the object gt the The light passes the object measured distance is larger than the without a diffuse reflection real distance gt No measurment is possible Seite Page 14 6 Teaching the OWLF Every sensor is delivered with the factory setup max measuring range The teach in feature was designed to choose a smaller range within the nominal measuring range for optimizing the resolution and linearity Output current voltage and alarm output adapt to the new range Two positions must be taught The first teach in position aligns with 0 V or 4 mA the second position aligns with 10 V or 20 mA These teach in positions are always just at the border of the new range inside the measuring range The sensor may be taught more than 10 000 times in its lifetime The sensor can always be reset to the factory settings The sensor may be taught wi
13. ill be reflected diffusely The position of the received light spot on the receiver a diode line defines the receiving angle This angle corresponds to the distance and is the base for the internal calculations A distance change close to the sensor effects a large change in angle the same distance change at the end of the measuring range has a much smaller effect to the angle This non linearity feature is linearized by the microcontroller The analog output signal is linear to the distance Diode line with 4 receiving light spot Object close to sensor Object far away The sensor adapts automatically to different object colors by varying the emitting laser intensity and optimizing the exposure time The result is a sensor that is nearly independent on different reflections different colors shiny surfaces dark objects The sensor reaches its highest accuracy if the object reflects diffusely Seite Page 5 4 Mounting instructions For a proper mounting the mounting surface has to be flat Be aware of the max tightening torque In case of EMC the sensor has to be grounded and a shielded cable has to be used The 90 rotating connecter allows wiring the sensor from the bottom side or from the rear The max accuracy will be reached gt 15 minutes after power on Steps edges am When measuring right next to steps edges it is important that the receiving beam is not covered by the steps edges This also ap
14. input Hold function of the analog output switching off the laser diode If 12 28 V is being applied to the sync input then the sensor will hold the value of the current meas urement and will switch off the laser diode It will wait until the sync input goes back to low 0 V before it starts a new measurement After every measuring cycle the sensor will test the sync input again After the high signal on the synch Input it takes one cycle T1 until the hold situation is reached 12 28 V i synch signal T1 d OV Low high edge of sync signal Sensor T1 OWLF 4007 4013 4030 4060 FA S1 L 0 9 ms OWLF 4100 FA S1 L 2 ms OWLF 4100 FS S1 L 10 ms Seite Page 33 Synchronizing several sensors Several sensors may be synchronized using an external clock The clock cycle must be low for less than T1 The total time of a cycle must be at least T2 Within 20 cycles all sensors will be synchro nized 12 28V sync signal paun ov T2 E Sensor T1 T2 T3 OWLF 4007 4013 4030 4060 FA S1 L 10 250 us gt 1000 us 5 us 450 us OWLF 4100 FA S1 L 10 250 us gt 3 MS 15 us 1800 us OWLF 4100 FS S1 L 0 01 3 ms gt 10 5 ms 0 1 7 ms If sensors are being synchronized this way they all start their cycles at the same time This means they start to sample light together The length of the sampling interval T3 or shutter time depends on the surface It may range from T3 White or gray o
15. osition of the measuring range This is the position that will later produce 0 V or 4 mA Briefly press the button again The LED will stop blinking and will stay on for about 3 sec to indicate that the first position has been stored Then the LED will blink again 6 Now place the target at the second position the other end of the new range which will produce 10 V or 20 mA 7 Briefly press the button again The LED will stop blinking and will stay on for about 3 sec to indicate that the second position has been stored The LED will then turn off and blink once more Now the sensor is ready to measure ey gi The new smaller operating range is now set The red LED now indicates whether an object is within the new range LED OFF or not LED ON If one of the new borders of the range was outside the standard range or the two positions were too close to each other then the new settings are not valid The sensor will respond with an extended blinking at the end of the teach procedure The previous settings are still valid and the new settings are lost Seite Page 23 Timing of the teach procedure 2266 5 Ba p A s o LED is ON if the procedure was successful lt 4 ___ _ TUUU O LED blinks if the procedure was not successful Seite Page 24 6 2 How to reset the factory settings using the teach button Within 5 minutes after power up the button may be used to reset the sensor back to
16. plies to depth measurements of holes or valleys Seite Page 6 Mounting above shiny surfaces On shiny surfaces it is important that no direct reflection can get to the receiving optics The reflec tion could blind the sensor and produce poor results To prevent this the sensor may be slightly tilted The direct reflection can be seen on a white piece of paper when held in front of the receiver e E S J 2 Mounting above round shiny surfaces y ie Ne ai Seite Page 7 Objects with color edges in the same direction When color edges are orientated in the right direction the effect to the measuring result will be minor If the color edges are in the wrong direction the effect will depend on the reflectivity of the different colors gt Shiny objects with a constant structure Especially shiny objects with a constant structure lathed or scuffed objects extruded aluminum profiles etc could have a negative effect on the measuring result Seite Page 8 Profile measurement For profile measurements the sensor axes should be perpendicular to the moving direction Ambient light Be careful that no strong light source faces the receiving field yA yA KK Je 3 d A d A o we Seite Page 9 Several sensors without mutual optical interferences Several sensors when mounted next to the other can affect each other When
17. screw head and the sensor e electrical connection Power supply A D Converter If you prefer another grounding concept please contact Welotec Seite Page 41 Seite Page 42 13 Accessories 14 Troubleshooting Error ______ Possible reason Correction Connecting cable straight ZWK D12 Gk28 length 2 m The sensor does The sync input or the teach in Connect sync input or the teach in ZWK D12 Gk58 length 2 m not measure wire is connected to Vs wire to 0 V ZWK D12 Gk108 length 2 m The receiving beam is covered Make sure that no object is in the by an object edge step receiving field Mounting bracket ZWR OWLE OWLF No receiving signal transparent or highly reflective object diffuse reflecting surface Front window Protective disk protective foil laser sensor OWLE OWLF The sensor has incorrect measur between two or more sensors within the receiving field of the sensor ing values Strong ambient light Prevent ambient light with a shield Semi transparent transparent or Make sure that the laser spot falls on a highly reflective objects diffuse reflecting surface The sensor does Rough surface Possibly use a sensor with laser line not reach the s e gde olo C y accuracy Resolution of the A D converter Read the manual of the control unit in the control unit Seite Page 43 Seite Page 44
18. th the teach button or via the external teach input During the teach in process the red LED and the alarm output provides a feedback The red LED on the back side of the sensor and the alarm output indicate run mode if an ob ject is within the measuring range Attention Within 5 minutes after power on the sensor can be taught via the button or the teach in wire After 5 minutes the teach in button will be locked preventing accidental adjustment The teach in wire is active all the time Seite Page 15 Example GOTT 1 oF a taught BEEBE BEE Standard output w curve Example of a Analog out taught measuring 10V 20 mA range OV 4mA Alarm out LED Example of a Analog out reverse taught 10V 20mA areversed P Le measuring range output ke curve Standard output curve OV 4mA Alarm out LED i m m 0 3 m m 0 Seite Page 16 OWLF 4007 Fa S1 L Typical resolution MR taught measuring range Typical linearity error MR taught measuring range OWLF 4013 FA S1 L Typical resolution MR taught measuring range Typical linearity error MR taught measuring range 25 a0 60 ae 70 ap MR 40 mm l ee 250 8 z 40 MR 40 mm a 7 a ei H 700 MR 100 mm D a a PP sg Se SS eS See est e e m MR 30 mm o MP SCHER z252 69 _ _________MA 100mm __ r ge ZE MIR ED mm z E E 100 S E o MR
19. utton There is no 5 min time limit The sensor may be taught at any time The alarm output can be used as an acknowledge signal for a control system 12 28 V Teach in wire OV t15 A t1 l t14 red LED Alarm output Seite Page 28 Delay between teach signal and response on alarm output external teach input alarm output Seite Page 29 Time Description of timing functions Value Comment Using the button this feature can Minimum button hold time to enter only be used eil SE t1 5s after power up Using the external teach mode Maximum waiting time after teaching the first position lt 20s teach input it may be used at any time If the button has not been pushed during this interval the sensor will leave the teach mode without any changes LED on as response for the first position Maximum waiting time after teaching the second position LED on and OK response after approx 3 s If the button has not been pushed during this interval the sensor will leave the teach mode without any changes Ss the second position approx 3 s LED Blinking for NOT OK t6 response after teaching the approx 5s second position Minimal time between high low 17 transition of alarm output high low gtt transition of the external teach input at the beginning of the teach Seite Page 30 Pulse lengths on external teach input for first position EE ne
Download Pdf Manuals
Related Search