Air Gap Sensor AGS
Contents
1. Shall be at the end of line for lowest noise level Preamplifier AHI GND Alternative color code DO NOT PAINT Triaxial cable AGS Wiring diagram 121018 Figure 12 AGS Wiring diagram Air Gap mm lout mA Vout V at 500 Ohm Oo 0 0 0 o 2 ee ee 2 100 O Table 1 AGS 10 0 20mA 2mA mm Output example Air Gap mm lout mA Vout V at 500 Ohm 0 4 ee 2 4 2 po 2 8 10 Table 2 AGS 10 4 20mA 1 6mA mm Output example Air Gap Sensor AGS Installation and user manual 121126 13 15 MIKROTREND 4 13 Typical linearity diagram 11 00 10 00 E error Vmeasured V 9 00 8 00 7 00 6 00 5 00 4 00 Vmeasured V Error 3 00 0 2 4 6 8 10 12 14 16 Air Gap mm 5 Troubleshooting Pole profile Output signal higher than 20mA or 10V Check the distance to pole surface is within measuring range If this happens during replacement of a new sensor slowly turn Offset adjustment trimmer potentiometer inside Conditioner unit until reaching desired output 2 Pole profile Output signal to low A If this happens during replacement of a new sensor slowly turn Offset adjustment trimmer potentiometer inside Conditioner unit until reaching desired output B If2. assumes no liability for applications assistance or customer product design Customers are responsible for their products and applications using Mikrotrend components To minimize the risks associated with customer products and applications customers should provide adequate design and operating safeguards Mikrotrend does not warrant or represent that any license either express or implied is granted under any Mikrotrend patent right copyright mask work right or other Mikrotrend intellectual property right relating to any combination machine or process in which Mikrotrend products or services are used Information published by Mikrotrend regarding third party products or services does not constitute a license from Mikrotrend to use such products or services or a warranty or endorsement thereof Use of such information may require a license from a third party under the patents or other intellectual property of the third party or a license from Mikrotrend under the patents or other intellectual property of Mikrotrend Reproduction of information in Mikrotrend data sheets is permissible only if reproduction is without alteration and is accompanied by all associated warranties conditions limitations and notices Reproduction of this information with alteration is an unfair and deceptive business practice Mikrotrend is not responsible or liable for such altered documentation Resale of Mikrotrend products or services with statements different fro
3. be modified Muticore shielded cable between Preamplifier and Conditioner unit may be shortened if neccesary Gently preshape the triaxial cable by hand to get the right form avoid to bend it beyond a right angle Immobilize the triaxial cable inside The Air Gap to prevent vibrations and or mechanical displacement hold the triaxial cable temporary with Cyanoacrylate type glue point glued to the stator laminations iron surface applly Silicone sealant along the cable in the Air Gap up to the exit making a strong permanent bond Air Gap Sensor AGS Installation and user manual 121126 12 15 MIKROTREND 4 12 Connection to Conditioner unit AGSC The figure illustrates how to connect the multicore cable to the Conditioner unit Pole profile output gives instantaneous air gap value measured by the sensor It is optocoupled and insulated from sensor ground and also from power supply negative Output signal can be ordered as 0 20mA or 4 20MA NOTE When 0 10V output is needed instead of 0 20MA 4 20MA a current to voltage conversion resistor of 500 ohms should be placed at the end of line near the acquisition unit lower noise level Multicore shielded cable N C N C N C Power supply D 24VDC 0 15A Fo esececeseessseesseesssessssesan NOTE This shield shall be connected with blue wire Optional 5000hm resistor for conversion from 0 20mA to 0 10V or 4 20mA to 2 10V
4. B other bandwidth optional Storage temperautre Relative humidity Vibration Shock CEC 682 27 15g peak tims o Z Mech dimensions Case protection class PS AGS 350gr AGSC 1500g Air Gap Sensor AGS Installation and user manual 121126 5 15 MIKROTREND AGSC 10 Air Gap Signal Conditioner 220x120x80mm 10x70mm Multicore shielded cable 3 5mm x 10m Figure 4 AGS 10 outline drawing AGSC 15 Air Gap Signal Conditioner 220x120x8O0mm 10x70mm Multicore shielded cable 3 5mm x 10m Figure 5 AGS 15 outline drawing AGSC 25 Air Gap Signal Conditioner 220x120x80mm 10x70mm Multicore shielded cable 3 5mm x 10m Figure 6 AGS 25 outline drawing a O4 3mm x 1 8m Preamplifier AGSC 50 Air Gap Signal Conditioner 220x120x80mm 10x70 Multicore shielded cable 10x70mm 3 5mm x 10m Figure 7 AGS 50 outline drawing Air Gap Sensor AGS Installation and user manual 121126 6 15 MIKROTREND 4 instalation instructions 4 1 AGS Signal Conditioner unit installation guide Figure 8 The Conditioner unit AGSC 4 2 Apropriate location for AGS Signal Conditioner unit up to 10 meters from the sensor probe up to 100 meters from acquisition unit with 0 20mA loop if voltage output used interference free distance may vary prefer well ventilated dry area free of vibrations and stray magnetic fields ensure adequate ground for en
5. MIKROTREND Air Gap Sensor AGS Installation and user manual Air Gap Sensor AGS Installation and user manual 121126 1 15 MIKROTREND Contents T OVS VOW crea seca EE ATEENA eee eeasees 3 2 PAC AUN ON a as esos dees a a EAEE EREE 4 3 Technical Specifications ccccccsscssseseescenssenseeeseeeeeneeseseees 5 4 instalation instructions sicsitecieszeccstcecssetssececeavensecevenstecseseawsveceass 7 4 1 AGS Signal Conditioner unit installation Quide ccccccesseeeeee ees 7 4 2 Apropriate location for AGS Signal Conditioner unit ccee 7 4 3 Grounding of AGS Signal Conditioner unit ccceeeeeseeeeeeeeeeeeees 7 4 4 Power supply CONNECTION ccccccceeecseeeseeeseeeeeeeneeeceeeseueeneeeseeeeees 7 4o Calibration emede banenadabancnanebacemenohaeenedeeesaceeee 7 4 6 AGS Sensor probe installation guide cccceccceececeeeeseeeeseeeesenes 8 Auk MP1ACING IMC SENSO uavaciverasarerarcuancuavivateumeuasauauavehaneuaueCaneiuetauaueuatenavees 8 4 8 Preparing the Stator SUITACE ccceccceeeeseeeseeeeeeeeneeeseeeeeueeaeeesaeeeees 9 49 Mounting TS SONS OM vacateastenceecencncrecncncteenmcnceenencantcesacawerenne rasan 9 4 10 True Air Gap and offset cccccccecceseeeeseeeeseeeeseeeeseeeeseeeseeeesaes 11 AN Ti GANS MVS AN ON e canteeetnoctnseceeteceeseatnent 12 4 12 Connection to Conditioner unit AGSC cc ceecccseeeeeeeeeeeeeeeeees 13 4 13 Typical measur
6. closure with minimum lenght of wire ensure access to 24 Vdc Power Supply Whenever possible use auxiliary enclosure with door end hinge to additionaly shield Conditioner unit from environmental influences thermal changes etc 4 3 Grounding of AGS Signal Conditioner unit CAUTION WARNING Grounding is essential for system operation integrity as well as for protection against hazardous voltages For best grounding provide the shortest path possible between the Conditioner unit and the grounded structure MULTICORE CABLE SHIELD SHALL BE GROUNDED AT ACQUISITION CARD INPUT ONLY MULTIPLE GROUND POINTS WILL CAUSE NOISE PICK UP AND CAN DAMAGE CONDITIONER UNIT ELECTRONICS 4 4 Power supply connection Power to AGS Signal Conditioner unit shall be 24VDC 10 0 15A max Conditioner unit input has insulated DC DC converter allowing any pole to be grounded or floating power supply as well as daisy chain of several Conditioner units 4 5 Calibration The Sensor head and Signal Conditioner units are factory matched and calibrated for best performance However if needed can be calibrated at site For details please cantact www mikrotrend com Air Gap Sensor AGS Installation and user manual 121126 7 15 MIKROTREND 4 6 AGS Sensor probe installation guide CAUTION The AGSsensor probe shall be handled with care Do not apply paint or silicone to the sensor surface Never pull or use excessive force on the sensor cable or preampli
7. e adhesive 3M Scotch Acrylic Foam Tape VHB 4611 With glue thickness of 1mm a foam type tape will allow stator unevenness of up to 0 3 mm Alowed temperatures of 149 C for weeks and short time up to 230 C hours Clean the back surface of the sensor with a cotton rag moistened with isopropanol Place double sided adhesive tape on the back side of the sensor Remove protective foil and carefully place sensor in position without touching adhesive surface Using protective gloves or a rag press the sensor firmly against the stator surface Adhesive is pressure sensitive and reacts on the first applied pressure The sensor can be put in use imediatelly after gluing full strenght will be reached after 24 hours B Silicone sealant adhesive non acid neutral high temperature Our prefered mounting technique with high flexibility and high holding force This is only metod recommended for Wireless Rotor AGS where high G forces are present Standard operation temperatures from 150 C up to 1200 C A must for locations where stator surface coating has low adhesion to stator laminate Silicone sealant effectively compensates uneven surface tensions during high load periods on generator thus ensuring stable mounting of the sensor Air Gap Sensor AGS Installation and user manual 121126 9 15 MIKROTREND With paper adhesive tape mark border area about 5 mm larger on each side than sensor surface Apply Silicone sealant about 1mm thick even
8. eparing the stator surface Thoroughly clean the stator surface use allowed cleaning liquid such as isopropanol alcohol disposable cotton rags and fine non metallic sandpaper WARNING DO NOT USE ACETONE OR OTHER SOLVENTS Use a clean rag moistened with isopropanol over the stator surface to remove oil and carbon deposits Epoxy coated or painted stator laminations check for mechanical stability If necessary polish the surface and or remove unstable particles with non metallic sandpaper CAUTION Sensors bottom surface shall be insulated from stator iron a thin coat of Epoxy adhesive will provide suficient insulation After sanding once again clean stator surface with a rag moistened with isopropanol The glue surface should be flat without protruding laminations Slight unevenness can be tolerated 0 5mm Let the isopropanol evaporate at room temperature for about one hour before proceeding with glue application 4 9 Mounting the sensor The Air Gap Sensor probe must be aligned with the plane area of the rotor pole The sensor measuring surface shall always be entirely covered by the pole surface We recommend three metods for fastening the sensors each with different Curing times and operating temperatures CAUTION Commonly found Epoxid adhesive is not flexible enough The sensor may come off due to uneven surface tensions during high load periods on generator A Double sided tape quick and easy Double Sid
9. fier The sensor surface is treated with high quality insulation varnish it shall not be scrached as damage to semiconductive electrodes may occur 4 7 Placing the sensor Choose position for Air Gap Sensor probe considering number of sensors and machine poles True acurate stator geometry can be obtained with only two Rotor mounted Air Gap Sensors also True acurate Rotor geometry can be obtained with only two Stator mounted Air Gap Sensors htto www mikrotrend com wrm wireless hydrogenerator rotor monitor htm lf Wireless Rotor AGS is not used than good practical results are achieved with 4 sensors per generator for diameters of less than 7 5 meters 8 sensors per generators with dimeter 7 5 12 meters and 12 to 16 sensorsr for larger diameters Place sensors on the upper side of the stator as it will have higher excentricity than the lower side For stator height of more than 1 8 meters Air Gap sensors should be placed on the lower side also Sensor shall be glued against stator laminations as deep as practical in the air gap In general this is beneath the second ventilation hole The preamplifier small black box integrated within the cable must stay outside of the air gap and outside of the endwindings if possible outside the stator casing Stator Air Gap Sensors Rotor Air Gap Sensors Figure 9 Air Gap Sensor positions Air Gap Sensor AGS Installation and user manual 121126 8 15 MIKROTREND 4 8 Pr
10. ing accuracy diagram cccceceseeeeeeeeeeeeeeseeeenees 14 5 PUOUDISS IOC acer atts ester de ninnaa RASE 14 6 IMPON NOUE oreren EE 15 Air Gap Sensor AGS Installation and user manual 121126 2 15 MIKROTREND THIS INSTRUCTION MANUAL SHOULD BE READ CAREFULLY AND THE SAFETY INSTRUCTIONS OBSERVED BEFORE INSTALLING CALIBRATING OR USING THE EQUIPMENT DESCRIBED HEREIN Installation and maintenance must be performed by qualified personnel familiar with the construction operation and hazards involved with the equipment Installation and maintenance must be performed with the control out of operation and disconnected from all sources of power Care should be taken when servicing electrostatic sensitive components The manufacturer s recommendations for these components should be followed Ventilation passages should be kept open The means employed for grounding or insulating the equipment from ground should be checked to assure its integrity Care must be taken to avoid damaging any delicate components and to avoid displacing dust dirt or debris in a way that permits it to enter or settle into parts of the control equipment Enclosures should be inspected for evidence of deterioration Accumulated dust and dirt should be removed from the top of the enclosures before opening doors or removing covers 1 Overview High accuracy non contact capacitive type distance measuring transducer for measuring air ga
11. ly spread over entire back surface of the sensor Carefuly place sensor within paper covered opening and firmly press until sealant stops comming out Wipe of excess sealant with paper towel until clean and remove adhesive paper border Fix the sensor in position with adhesive tape Power Tape for at least 6 hours Full curing times up to 24 h shorter with higher ambient moisture C Two component glue short curing time If stator laminate coating is strong and stable and for continuous operation temperature not exceding 80 C You can use two component adhesive tyoe LOCTITE MULTIBOND 330 It is quick and simple application but flexibility is not great and above mentioned precautions about surface Stability and operating temperature shall be observed When generator is under heavy load and if surface is not stable enough the sensor may come off due to tensions which adhesive cannot compensate Clean the back surface of the sensor with a rag moistened with alcohol Follow manufacturers instructions Curing times will vary with surface temperature 50 of the final strength is reached after 10 30 minutes full strength after approx 5 hours Figure 10 Air Gap Sensor probe installed at Stator pole Air Gap Sensor AGS Installation and user manual 121126 10 15 ee mid 3 bid P r i F j Figure 11 Air Gap Sensor installed at Rotor pole 4 10 True Air Gap and offset The output of the signal conditioner pro
12. m or beyond the parameters stated by Mikrotrend for that product or service voids all express and any implied warranties for the associated Mikrotrend product or service and is an unfair and deceptive business practice Mikrotrend is not responsible or liable for any such statements MIKROTREND d o o Technology park Zagreb D Golika 63 10000 ZAGREB CROATIA EUROPE Tel 385 1 3667 114 Fax 385 1 3667 115 GSM 385 98 504 838 e mail info mikrotrend com www mikrotrend com Air Gap Sensor AGS Installation and user manual 121126 15 15
13. p in air cooled generators and electric motors Low profile sensor with triaxial cable preamplifier and shielded cable High stability carbon particle semiconductive electrode DC DC insulated power supply Optocoupler insulated output 0 20 mA or 4 20mA Wide operating temperature range Sensor 0 125 C Signal Conditioner 0 55 C Immune to magnetic fields dust and oil vapours EMI RFI Air Gap Sensor AGS Installation and user manual 121126 3 15 MIKROTREND 2 Application Capacitive type Air Gap Sensor for air cooled generators and electrical motors It shall not be installed in hydrogen cooled turbo alternators Linear measuring range AGS 10 2 to 10 mm AGS 15 3 to 15 mm AGS 25 5 to 25 mm AGS 50 10 to 50 mm other ranges available per request High sensitivity high resolution up to 50 microns with oversampling Measuring of air gap rotor vibrations rotor symmetry power angle Figure 2 Air Gap signal Air Gap Sensor AGS Installation and user manual 121126 4 15 MIKROTREND Air Gap O Ma Measuring l range 30mm 2f0 Figure 3 Image of Air Gap signal polar data 3 Technical specifications po AGSHIO OL AGS 15 AGS 25 AGS 50 Probeweight withcable 880g 1 5 at 15mm 3 at 30mm Linearity typical FSD lt 0 3 Output pole profile 0 20mA OmA 0mm or 4 20mA 4mA 0mm with 500 Ohm termination resistor 0 10V 2 10V opto insulated 0 1000Hz 3d
14. this happens during normal working conditions check Sensor or Triax cable for damages 3 50 or 100Hz Noise in pole profile signal A Check grounding scheme Ground loops shall be avoided B AGS Conditioner unit will tolerate aprox 0 1 Tesla of stray magnetic fields If stronger fields are present use aditional protection box made from ferromagnetic material or move to other location Air Gap Sensor AGS Installation and user manual 121126 14 15 MIKROTREND 6 Important notice Mikrotrend d o o and its subsidiaries reserve the right to make corrections modifications enhancements improvements and other changes to its products and services at any time and to discontinue any product or service without notice Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete All products are sold subject to Mikrotrend s General terms and conditions of sale http www mikrotrend com PDF Selling Policy GI05c pdf supplied at the time of order acknowledgment Mikrotrend warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with Mikrotrend s standard warranty Testing and other quality control techniques are used to the extent Mikrotrend deems necessary to support this warranty Except where mandated by government requirements testing of all parameters of each product is not necessarily performed Mikrotrend
15. vides the distance value between the sensor surface and rotor pole Offset is the distance between the stator surface and sensor surface including the thickness of the glue Glue thickness Sensor thickness vill vary with sensor tyoe and mounting metod True Air Gap is sum of measured and offset value Offset compensation shall be made at the monitoring system Sensor surface Offset distance ED ADL LALDDAD ODD AALALASAL i So a5 048 TOEA FESR EKER ROOK ESRD LEK RRR RSE VSS 2 A ROLLS Stator surface Figure 10 Offset distance Air Gap Sensor AGS Installation and user manual 121126 11 15 MIKROTREND factory adj A i Pole profile factory adj B NIC N C OV factory adj C ia 24V Figure 11 AGSC Adjustments NOTE Before attempting new offset adjustement let AGSC Conditioner unit be powered for 20 30 minutes Slowly turn trimmer potentiometer labeled Offset adj untill reaching required output current voltage Normally very small rotation will provide large changes on output CAUTION DO NOT adjust other trimmer potentiometers factory adjustment only 4 11 Cable installation WARNING BEWARE OF HIGH VOLTAGES ON THE STATOR BARS 5 22 KV DO NOT ATTACH TRIAXIAL CABLE DIRECTLY TO THE STATOR BARS THE TRIAXIAL CABLE PREAMPLIFIER AND MULTICORE SHIELDED CABLE MUST BE PROTECTED BY A FLEXIBLE OR SEMI RIGID POLYETHYLENE PVC CONDUIT CAUTION The triaxial cable shall not
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