EM4 & EM7 Electromagnet Manual
Contents
1. Table 5 2 EM7 Electromagnet Accessories MODEL DESCRIPTION Additional Standard Pole Caps does not include bolts order separately EM7 2P FECO Pole cap 7 inch tapered to 2 inch face FeCo Pole cap 7 inch tapered to 2 inch face Additional Pole Caps with Optical Access Hole s does not include bolts order separately EM7 6P O 1 4 Pole cap 7 inch tapered to 6 inch face optical access 1 pole 1 4 inch diameter EM7 6P O 2 4 Pole cap 7 inch tapered to 6 inch face optical access both poles 1 4 inch diameter EM7 BOLT V Pair of lead screws for EM7 HV Variable gap electromagnets EM7 BOLT V O Pair of lead screws for EM7 HV Variable gap electromagnets with optical access holes Other Accessories EM7 BASE Magnet Base 30 5 cm 12 inches high EM7 CABLE Cable from magnet to supply 4 AWG 3 m 10 ft EM7 FLOW Flow switch replacement Coolant Connector Kit This kit includes parts that complete the installation of the Water Flow 651 533 Switch which is partially installed at the factory The kit contains Quantity Description 1 Hose 5 8 inch I D 4 Hose clamps 1 Adapter Male Garden Hose Threads to 5 8 inch barbed 1 Adapter Female Garden Hose Threads to 5 8 inch barbed with washer 5 2 Options and Accessories A1 0 A2 0 A3 0 A4 0 Lake Shore EM7 HV Electromagnet User s Manual APPENDIX A FLOW SWITCH INSTALLATION GENERAL This appendix details installation of the cooling water flow switch kit Lake2. User s Manual EM HV Electromagnet EM7 magnets include Models EM7 HV and EM7 HV O H Yoke Variable Gap 7 inch Electromagnet Horizontal Field El akeShore Lake Shore Cryotronics Inc 575 McCorkle Blvd Westerville Ohio 43082 8888 USA E Mail Addresses sales lakeshore com service lakeshore com Visit Our Website www lakeshore com Fax 614 891 1392 Telephone 614 891 2243 Methods and apparatus disclosed and described herein have been developed solely on company funds of Lake Shore Cryotronics Inc No government or other contractual support or relationship whatsoever has existed which in any way affects or mitigates proprietary rights of Lake Shore Cryotronics Inc in these developments Methods and apparatus disclosed herein may be subject to U S Patents existing or applied for Lake Shore Cryotronics Inc reserves the right to add improve modify or withdraw functions design modifications or products at any time without notice Lake Shore shall not be liable for errors contained herein or for incidental or consequential damages in connection with furnishing performance or use of this material Revision 1 7 P N 119 622 15 February 2013 Lake Shore EM7 Electromagnet User s Manual LIMITED WARRANTY STATEMENT WARRANTY PERIOD THREE 3 YEARS 1 9 Lake Shore warrants that products manufactured by Lake Shore the Product will be free from defects in materials and workmanship for three years from the
3. Intercoil Space 17 8 cm 7 in 31 cm 12 2 in 1 5 cm 0 6 in Holes 4 for mounting to floor 30 5 cm 55 9 om 22 in 12 in 2 5 cm 1 in LSI See C EM 1 5 eps EEE Figure 1 1 Model EM7 HV Electromagnet Front View Introduction 1 3 Lake Shore EM7 Electromagnet User s Manual 6 1 cm 2 4 in 4 1 cm 1 6 in 52 cm 20 5 in 6 1 cm 2 4 in 94 cm 37 in E oe 45 8 in 5 8 cm 18 in 30 5 cm 1 5 cm 0 6 in 12 i Holes 4 U2 in for mounting to floor l 35 6 cm 14 n 5 1 cm 2 in gt y vy i 66 cm 26 in gt C EM 1 6 eps Figure 1 2 Model EM7 HV Electromagnet Side View Introduction Lake Shore EM7 HV Electromagnet User s Manual To Power Supply Rear View 2800000000800 200000000800 Water Inlet To Power Supply Remote Inhibit a DB 25 included only if Lake Shore Ground Lug MPS is part of system Not Used ia Flow Switch Water Outlet C EM 1 7 eps Figure 1 3 Model EM7 HV Electromagnet Rear View Wiring and Connections Introduction 1 5 Magnetic Field kG Magnetic Field kG Lake Shore EM7 Electromagnet User s Manual EM7 HV 51 mm 2 in Pole Face Field Plot 5 mm 0 20 in 10 mm 0 39 in 16 2 mm 0 64 in 25 mm 0 98 in 38 1 mm 1 5 in 50 mm 1 97 in 75 mm 2 95 in 100 mm
4. date of Purchaser s physical receipt of the Product the Warranty Period If Lake Shore receives notice of any such defects during the Warranty Period and the defective Product is shipped freight prepaid back to Lake Shore Lake Shore will at its option either repair or replace the Product if it is so defective without charge for parts service labor or associated customary return shipping cost to the Purchaser Replacement for the Product may be by either new or equivalent in performance to new Replacement or repaired parts or a replaced Product will be warranted for only the unexpired portion of the original warranty or 90 days whichever is greater Lake Shore warrants the Product only if the Product has been sold by an authorized Lake Shore employee sales representative dealer or an authorized Lake Shore original equipment manufacturer OEM The Product may contain remanufactured parts equivalent to new in performance or may have been subject to incidental use when it is originally sold to the Purchaser The Warranty Period begins on the date of Purchaser s physical receipt of the Product or later on the date of operational training and verification OT amp V of the Product if the service is performed by Lake Shore provided that if the Purchaser schedules or delays the Lake Shore OT amp V for more than 30 days after delivery then the Warranty Period begins on the 31st day after Purchaser s physical receipt of the Product This limited
5. describe it briefly and include the manual title and page number Send your comments to Lake Shore Cryotronics Inc Attn Technical Publications 575 McCorkle Blvd Westerville Ohio 43082 8888 1 1 GENERAL DESCRIPTION Refer to Table 1 1 for detailed specifications For dimensional diagrams see Figures 1 1 and 1 2 e Continuously adjustable air gap by means of rotating hand spokes or moveable poles allowing rapid air gap changes to suit individual experiments assures magnet versatility The poles lock in place by locking levers on each side of the electromagnet frame Use air gaps up to 17 8 cm 7 inches with cylindrical or tapered pole caps e Water cooled coils provide excellent field stability and uniformity when high power is required to achieve the maximum field capability for the electromagnet Easy pole cap exchange by 4 bolt pole caps for variations in pole face diameters e Accurate pole alignment by precise construction of the air gap adjustment mechanism Precision cast yokes of magnetically soft ultra pure steel assure precise pole face alignment critical for good homogeneity and reproducibility The yoke incorporates large radius corners to reduce stray magnetic fields and reduce residual magnetic forces for more linear operation The H Yoke is at a 45 angle for optimum air gap accessibility Couple the EM7 HV with a Model 648 magnet power supply MPS to form a versatile laboratory electro
6. for operating and servicing COOLING WATER REQUIREMENTS Standard municipal water systems are generally suitable to cool the magnet provided proper flow is maintained do not use distilled water Use a water filter flowmeter and pressure gauges to monitor coolant water flow If the water temperature is well above 32 C 90 F install a water cooling device at the magnet water inlet To avoid moisture condensation on the magnet adjust the cooling system to keep the magnet coils several degrees above ambient air temperature UNPACKING Inspect shipping container for damage If it is damaged or the inside cushioning material appears stressed check the shipment for completeness and proper operation following procedures outlined in this manual Keep all packing material in case of return If components are missing from your shipment or if there is mechanical damage or defect apparent or concealed notify Lake Shore If the shipping container or cushioning material shows signs of stress notify the carrier as well as Lake Shore Keep the shipping materials for inspection by the carrier ACCESSORIES The standard Model EM7 electromagnet includes the following accessories Quantity Description 2 Power Cables Attached 1 Flow Switch Kit Refer to Appendix A Refer to Chapter 5 for a complete list of electromagnet accessories Installation 2 1 2 5 2 2 Lake Shore EM7 Electromagnet User s Manual INSTAL
7. screw Generally it is desirable that the pole locking lever be able to lock and unlock the pole caps in one motion without having to re adjust the ratcheting mechanism 4 2 RUST PREVENTION Follow these tips to prevent rust on your electromagnet e Wipe clean all pole and polecap surfaces with a clean lint free cloth lightly oiled with high quality light oil Maintaining a layer of light oil will prevent rust build up on the steel parts of the electromagnet Even corrosion resistant parts are subject to deterioration e To oil the pole and sleeve retract the left pole fully into the electromagnet coil extend the right pole fully and lubricate the extended pole Repeat for the opposite pole e Running the pole adjuster s screw mechanism from end to end is also good for the electromagnet Verify the motion is smooth and does not jam at any point in the travel If problems are encountered when moving the mechanism the lead screw and or sleeve may need to be cleaned and lubricated Consult with the factory e When exchanging pole caps be certain to use light oil on the exposed pole core mating surface to keep it rust free Keeping these parts oiled and free from contamination is a good preventative measure If condensation is seen on the exterior of the electromagnet wipe it away with a soft clean dry cloth to prevent corrosion 4 3 RUST REMOVAL Remove all traces of rust with crocus cloth 4 0 grit or finer Remove all traces of abrasives w
8. the magnet The rotating hand knobs on the side of the magnet allow users to vary the air gap from 0 to 17 8 cm 0 to 7 inches WARNING Always set current to zero amps and turn off the power supply before adjusting the magnet After adjusting the pole spacing lock the poles in place by securing the locking levers on the EM7 POLE CAP REPLACEMENT The Model EM7 HV electromagnet uses replaceable pole caps If another geometry of pole cap is desired the existing pole caps can be unbolted and another pair can be installed Most pole caps are of either a straight or a tapered design focusing the magnetic flux from the 178 mm 7 in pole core to the diameter of the installed pole cap s face Generally pole caps with a larger pole face diameter will give higher field uniformity and lower magnetic field density while pole caps focused to a smaller pole face will yield higher fields and lower field uniformity Standard pole caps are made of high purity iron with a thin electroless nickel finish for corrosion resistance Pole caps comprised of materials with higher saturation induction such as FeCo can also be installed to further increase field strength To remove a pole cap you must unbolt the four pole cap retaining screws remove the old pole caps and attach the new pole caps using four socket head cap screws of appropriate length A hex key kit is provided to assist in fastening the socket head cap screws Due to changes in the mounting geomet
9. warranty does not apply to defects in the Product resulting from a improper or inadequate installation unless OT amp V services are performed by Lake Shore maintenance repair or calibration b fuses software power surges lightning and non rechargeable batteries c software interfacing parts or other supplies not furnished by Lake Shore d unauthorized modification or misuse e operation outside of the published specifications f improper site preparation or site maintenance g natural disasters such as flood fire wind or earthquake or h damage during shipment other than original shipment to you if shipped through a Lake Shore carrier This limited warranty does not cover a regularly scheduled or ordinary and expected recalibrations of the Product b accessories to the Product such as probe tips and cables holders wire grease varnish feed throughs etc c consumables used in conjunction with the Product such as probe tips and cables probe holders sample tails rods and holders ceramic putty for mounting samples Hall sample cards Hall sample enclosures etc or d non Lake Shore branded Products that are integrated with the Product To the extent allowed by applicable law this limited warranty is the only warranty applicable to the Product and replaces all other warranties or conditions express or implied including but not limited to the implied warranties or conditions of merchantability and fitness f
10. 0 mm 2 75 in 150 mm 6 in 51mm 2 00 in 125 mm 5 in 44 mm 1 75 in 100 mm 4in 29 mm 1 13 in 75 mm 3 in 19 mm 0 750 in 50 mm 2 in 19 mm 0 750 in Unlock the pole locking levers so the pole caps move in and out freely Rotate one pole adjuster s spokes to move one pole cap outward until the front of the pole cap is as far out as it can be moved Rotate the opposite pole adjuster s spokes to move the other pole cap inward until the pole cap is outside of the coil surface The pole cap is now ready to be removed Using the hex wrench provided unscrew the mounting bolts one turn counter clockwise Continue carefully unscrewing the pole cap mounting bolts until the pole cap is free CAUTION Itis important to hold onto the pole cap when unscrewing the mounting bolts The pole cap may be damaged if it suddenly disengages from the pole piece and drops against a hard surface NOTE Standard right hand threads are used in the pole cap to pole core mounting When installing pole caps keep the threads and surface free of any foreign material A thin film of grease on all the surfaces prevents rust 8 Align the new pole cap with the pole core threaded holes 9 Using the mounting bolts attach the new pole cap to the pole core Before final tightening turn the pole adjuster to move the pole cap outward by five turns This will draw the polecap into the pole sleeve and perform a final alignment of pole cap pole core and sleeve 10 Us
11. 3 94 in 133 5 mm 5 256 in 0 10 20 30 40 50 60 70 80 90 100 110 120 130 Current A Figure 1 4 Model EM7 HV Magnetic Field Versus Current for a 2 inch pole face EM7 HV 76 mm 3 in Pole Face Field Plot 5 mm 0 20 in 10 mm 0 39 in 16 2 mm 0 64 in 25 mm 0 98 in 38 1 mm 1 5 in 50 mm 1 97 in 75 mm 2 95 in 100 mm 3 94 in 133 5 mm 5 256 in 0 10 20 30 40 50 60 70 80 90 100 110 120 130 Current A Figure 1 5 Model EM7 HV Magnetic Field Versus Current for a 3 inch pole face Introduction Lake Shore EM7 HV Electromagnet User s Manual EM7 HV 102 mm 4 in Pole Face Field Plot 30 5 mm 0 20 in 10 mm 0 39 in 16 2 mm 0 64 in 25 25 mm 0 98 in 20 38 1 mm 1 5 in 50 mm 1 97 in Magnetic Field kG a 75 mm 2 95 in 100 mm 3 94 in 133 5 mm 5 256 in 0 10 20 30 40 50 60 70 80 90 100 110 120 130 Current A Figure 1 6 Model EM7 HV Magnetic Field Versus Current for a 4 inch pole face EM7 HV 152 mm 6 in Pole Face Field Plot 25 5 mm 0 20 in 10 mm 0 39 in 20 16 2 mm 0 64 in 2 P 25 mm 0 98 in z 38 1 mm 1 5 in ye 50 mm 1 97 in D 5 10 75 mm 2 95 in 100 mm 3 94 in 133 5 mm 5 256 in 5 Z 0 10 20 30 40 50 60 70 80 90 100 110 120 130 Current A Figure 1 4 Model EM7 HV Magnetic Field Versus Current Charts for a 6 inch pole face Introduction 1 7 1 8 Lake Shore EM7 Electromagnet User s Manual Introdu
12. A beens 5 OPTIONS AND AGCESSORIES drainer ahnen raa a aesa rarae aa naa a aaaea Eeee aana h iaaea EEEE REAA 5 0 A E EE E E E E EE A ANT A S E I N E E AE 5 1 SYSLEMOPUIONS E lt diet ce A A a tods 5 2 ACCTOSSOMOS cian APPENDIX A FLOW SWITCH INSTALLATION cooooococconcccccnccnnnnnnoncnnncnnnnnnnnnnnnncncnnnnnnnnn eeaeeeseeeeeseeeeeeaneeeeeees AO aia A2 0 EM Coolant Connector Kit List Of PartS ccccnnninoninocinininnninneneneneninenenenenononenenenenenenenenenenos A3 0 EM7 Flow Switch SpecificatiONS oooonnnnnocccnnnnnnnnnnnonononncnncnnnnnnnoncnnnnnn conan nn cnn nn nn ran annnnn rca A4 0 EM 7 Flow Switch InstallatiON ococococococococococicininininininininininnonononononononononononononenenenenininos A5 0 EM7 Flow Switch AdjustMent ooocccinnnccnnnnncocnnoncccncnnnnnn nano nnn nn anno nn en rn rr APPENDIX B UNITS FOR MAGNETIC PROPERTIES coooocoococcccccccccnnnnnnonononcnnnnnnnannnnnnnnnnnnnnnnanenennnnnnnn Table of Contents Lake Shore EM7 Electromagnet User s Manual Table of Contents Lake Shore EM7 HV Electromagnet User s Manual CHAPTER 1 INTRODUCTION 1 0 GENERAL The EM7 HV electromagnet is a compact electromagnet suited for many applications such as susceptibility measurements Hall effect studies magneto optical studies and magnetic resonance demonstrations We welcome comments concerning this manual Although we try to keep it error free some may occur When reporting a problem
13. LATION PROCEDURE CAUTION The coils are not designed to rigidly attach to the magnet yoke Damage may result if the magnet tilts without bracing between the coils During shipment dense packing foam or wedges between the coils hold them firmly in place Do not remove this material until the magnet is installed in the final location Leave magnet bolted to shipping pallet during transportation to the installation site it protects the magnet from vibration and the effects of an uneven floor Do not subject the magnet to sudden bumps or jolts WARNING To avoid danger to personnel and equipment damage bolt magnet to the stand and 5 bolt the stand to the floor If not using the stand bolt magnet directly to floor Remove shipping pallet and use appropriate lifting equipment to position the magnet and stand at the planned location Mark the bolt holes move the magnet and drill the bolt holes Insert bolt studs in the holes and secure Replace the magnet and stand over the studs and bolt in place Connect the water supply to the fittings on the magnet rear see Appendix A for flow switch installation The inlet is located on one of the coils with the outlet located on the other coil There is no distinction between the inlet and outlet Adjust the pole gap to the desired setting To do this unlock the pole pieces with locking levers then rotate the spokes to move the poles to set the air gap Lock the pole pieces in place Ground the y
14. Magnetic Properties
15. Shore P N 651 523 for the Model EM7 electromagnet and the Model 648 magnet power supply or any power supply with an external prohibit interlock feature Refer to Paragraphs A2 0 to A5 0 for EM7 flow switch installation EM7 COOLANT CONNECTOR KIT LIST OF PARTS The coolant connector kit P N 651 533 includes parts that complete the installation of the water flow switch which is partially installed at the factory The kit contains Quantity Description 1 Hose 5 8 inch I D 4 foot section 4 Hose clamps 1 Adapter male garden hose thread to 5 8 inch barb 1 Adapter female garden hose thread to 5 8 inch barb with washer EM7 FLOW SWITCH SPECIFICATIONS The factory adjusts the EM7 flow switch to close at 2 gallons per minute gpm and to operate normally open N O It can be field adjusted to a different flow rate refer to Paragraph A5 0 The flow switch operates with both normally closed N C and normally opened N O contacts The flow switch incorporates a single pole single throw SPST switch set to activate by a moving magnet at a flow rate of 2 gallons 8 liters per minute The contacts are rated at 60 VA All necessary fittings are provided to connect the switch to the coolant outlet of most electromagnets For additional information see the flow switch users manual EM7 FLOW SWITCH INSTALLATION For proper switch operation keep it out of the field generated by the electromagnet In general connecting the switch at the e
16. additional details Figure A 3 Flow Switch Rate Adjustment Appendix A Flow Switch Installation A 3 Lake Shore EM7 Electromagnet User s Manual Appendix A Flow Switch Installation Lake Shore EM7 HV Electromagnet User s Manual APPENDIX B UNITS FOR MAGNETIC PROPERTIES Conversion from CGS to SI Units SI 8 Rationalized mks Conversion Factor C Gaussian Quantity amp CGS emu Magnetic flux density flux den tesla T Wb m Magnetic induction weber Wb volt second Ves ampere A Magnetic Flux Magnetic potential difference magnetomotive force Magnetic field strength magnetizing force Volume magnetization Volume magnetization i 3 Magnetic polarization intensity of magnetization Mass magnetization Aem joule per tesla J T Wbem Magnetic moment emu erg G Magnetic dipole momen emu erg G Volume susceptibility Mass susceptibility dimensionless emu cm cm g emu g any x 107 3 4r x 10 io Henry per meter H m Wb A m m kg H m kg m mol Hem mol H m Wb A m dimensionless Jim 4m 2 x 10 4r x 10 4n x 10 Sa cm mol emu mol Molar susceptibility Pame o Relative permeability yu u Ur Volume energy density Ww energy product D N Demagnetization factor D N dimensionless not defined 10 erg cm dimensionless dimensionless NOTES a Gaussian units and
17. cgs emu are the same for magnetic properties The defining relation is B H 41M b Multiply a number in Gaussian units by C to convert it to SI e g 1 Gx 10 T G 10 T c SI Syst me International d Unit s has been adopted by the National Bureau of Standards Where two conversion factors are given the upper one is recognized under or consistent with Sl and is based on the definition B Uo H M where to Ho 4r x 10 H m The lower one is not recognized under SI and is based on the definition B poH J where the symbol l is often used in place of J d 1 gauss 10 gamma y e Both oersted and gauss are expressed as cm gs in terms of base units f A m was often expressed as ampere turn per meter when used for magnetic field strength g Magnetic moment per unit volume h The designation emu is not a unit i Recognized under SI even though based on the definition B oH J See footnote c j Ur p po 1 y all in SI pis equal to Gaussian p k B Hand uM H have SI units J m M H and B H 4r have Gaussian units erg cm R B Goldfarb and F R Fickett U S Department of Commerce National Bureau of Standards Bolder Colorado 80303 March 1985 NBS Special Publication 696 For sale by the Superintendent of Documents U S Government Printing Office Washington D C 20402 Appendix B Units for Magnetic Properties B 1 Lake Shore EM7 Electromagnet User s Manual Appendix B Units for
18. ction 2 0 2 1 2 2 2 3 2 4 Lake Shore EM7 HV Electromagnet User s Manual CHAPTER 2 INSTALLATION GENERAL This chapter covers electromagnet installation Site planning in Paragraph 2 1 cooling water requirements in Paragraph 2 2 unpacking in Paragraph 2 3 accessories in Paragraph 2 4 installation procedure in Paragraph 2 5 and the return and shipping procedure in Paragraph 2 6 SITE PLANNING Consider these things when choosing the installation site Magnetic Environment Minimize environmental magnetic fields Common sources of interference are fluctuating loads on adjacent power lines heavy duty power transformers elevator motors and similar electromagnetic devices Structural Support Floor Strength Allow for adequate support of components and handling equipment The floor must be sufficiently rigid for minimum vibration from adjacent dynamic loads Service Utilities Maintain room temperature and cooling water specifications Ambient Temperature Magnet cooling water system operates at designed thermal efficiency when room temperature is within normal bounds Equipment Handling Ensure adequate moving equipment transportation route clearances and supervision by qualified personnel Ventilation Ensure adequate ventilation especially during use of cryogens Other Factors Existing or planned facilities local safety electrical and building codes access to all sides of the equipment
19. e the hex wrench to finally tighten the cap against the pole piece 11 Rotate the pole adjuster spokes to move the new pole cap s pole outward until the front of the pole cap is as far outward as it can be moved 12 Repeat Steps 4 thru 11 to change the other pole cap 13 Rotate the pole adjuster spokes to move the poles to set the air gap As the final adjustment of airgap it is preferable to rotate the pole adjuster at least one turn outward to eliminate the backlash in the pole adjuster s screw mechanism NOTE Eliminating the screw backlash will minimize unwanted pole deflection when large pull forces develop due to the large fields in the electromagnet airgap 14 Lock pole caps in place Operation Lake Shore EM7 HV Electromagnet User s Manual CHAPTER 4 MAINTENANCE 4 0 GENERAL This chapter describes the pole cap replacement procedure for the Model EM7 4 1 ADJUSTING THE POLE LOCKING LEVER MOTION The pole locking lever has a ratcheting mechanism which may be used to adjust the movement of the pole locking levers To change their movement follow this procedure 1 Pull up on the central portion of the pole locking lever This frees the pole locking lever from the pole locking screw 2 Rotate the pole locking lever it should move independently of the screw to the desired position You may need to hold the central screw with a hex key to ensure it moves independently 3 Release the pole locking lever to re engage the
20. ith a soft clean cloth 4 4 FOREIGN MATTER Remove all traces of foreign matter from the pole caps with a soft clean cloth Do not let foreign material fall into the sleeve of the electromagnet Due to tight pole to sleeve tolerances any foreign matter introduced into the sleeve when the poles are retracted may cause future operating problems Maintenance 4 1 Lake Shore EM7 Electromagnet User s Manual Maintenance Lake Shore EM7 HV Electromagnet User s Manual CHAPTER 5 OPTIONS AND ACCESSORIES 5 0 GENERAL This chapter lists EM7 options in Paragraph 5 1 and accessories in Paragraph 5 2 5 1 SYSTEM OPTIONS Table 5 1 lists available EM7 electromagnets The electromagnets can be tailored to fit many custom applications Consult the factory for assistance in configuring electromagnets for your application Table 5 1 Lake Shore Electromagnets EM7 HV 7 inch diameter pole caps H yoke variable gap set by rotating hand spokes EM7 HV O Same as EM7 HV with optical access Options and Accessories 5 1 Lake Shore EM7 Electromagnet User s Manual 5 2 ACCESSORIES Accessories are devices that perform a secondary duty as an aid or refinement to the primary unit Table 5 2 lists EM7 accessories The standard EM7 electromagnet includes the following accessories e 2 Sets of pole caps 3 and 6 inch e Corresponding pair of lead screws e Flow switch e Power cables 4 AWG 10 feet long Base 30 5 cm 12 inches high
21. magnet characterization system The Model 648 MPS provides rapid uniform magnetic field reversal to avoid discontinuities that often occur during zero cross over when using non bipolar power supplies Introduction 1 1 Lake Shore EM7 Electromagnet User s Manual Table 1 1 Model EM7 Electromagnet Specifications Specifications Air Gap Coil Resistance Type Water Flow Rate Water Chiller Cooling Capacity Coil Spacing Coil Width Coil Diameter Turns per Coil Amp Turns Current Max Continuous Operating Width Height Depth Weight Shipping Weight Shipping Size Magnet Power Supply Operating Current Operating Voltage Power Consumption EM7 Up to 17 8 cm 7 in continuously variable 1 Q per coil at equilibrium temp wired in parallel 0 5 Q total 11 4 liters per minute 3 0 gallons per minute 8 3 kW 28250 BTU Hr 17 8 cm 7 in 13 2 cm 5 2 in 44 5 cm 17 5 in 624 31 200 135 A 101 6 cm 40 in at max 17 8 cm 7 in gap Magnet 63 5 cm 25 in set at 45 Stand 30 5 cm 12 in 66 cm 26 in 636 kg 1400 Ibs 682 kg 1500 Ibs 122 cm 48 in x 119 cm 47 in x 86 cm 34 in Model 648 135 A 68 volts nominal 9 2 kW nominal Introduction Lake Shore EM7 HV Electromagnet User s Manual 3 8 16 Tap Holes 2 101 6 cm 40 in 44 5 cm 17 5 in 12 2 cm 5 2 in 6 1 cm 2 4 in 35 cm 13 75 in
22. nd of a 10 inch long hose is sufficient to avoid any interference During normal operation cooling water flows through the magnet at a minimum rate of 2 gallons per minute which allows the power supply to be turned on To prevent damage to the electromagnet connect the flow switch to the system before operating the power supply CAUTION Do not manually bypass the interlock feature on the MPS The power supply interlock needs a closed contact to operate with the Lake Shore Model 648 MPS Connect the two wires to the remote inhibit terminals In this setup the flow switch contacts close when the flow is above 2 gallons per minute to allow the power supply to provide current for the magnet If additional interlock is to be connected externally to the unit it can be one or more N C contacts connected in series such as an emergency stop pushbutton See Figure A 1 Appendix A Flow Switch Installation A 1 A 2 Lake Shore EM7 Electromagnet User s Manual NOTES 1 NC Normal Closed 2 Power Supply Light and Remote Emergency Stop Switch are optional not provided by Lake Shore Remote Power Off NC Flow Power Supply Remote Emergency Switch NC Output Available Stop NC F EM A 3 eps Figure A 1 EM7 Flow Switch Wiring Diagram NOTE Both the flow switch and emergency circuits must be closed for the power supply to operate For non Lake Shore power supplies consult the power supply manual for details on where to connect flow s
23. oke to the power supply chassis for safety WARNING Do not connect or disconnect the electromagnet to or from the magnet power 6 7 supply without first reducing output current to zero amperes and turning off the supply The power supply connections are located on the rear of the coils if the cables are already connected check screw tightness To access the electrical connection remove the safety cover plates Connect the power supply cables to the terminal blocks on the rear of the coils Use two jumpers between the two coils for parallel operation Replace safety cover plates before operating the magnet Turn on the cooling water and adjust the flow rate to 11 4 liters per minute 3 gallons per minute Readjust the fittings if any leaking is observed Installation Lake Shore EM7 HV Electromagnet User s Manual 2 6 RETURN AND SHIPPING PROCEDURE If the electromagnet appears to operate incorrectly contact Lake Shore or a factory representative for a Returned Goods Authorization RGA Number Returns may not be accepted without an RGA number Attach a tag with the following information when returning RGA Number Model and Serial Number User s Name Company Address Phone Number and Fax Number PUN S Malfunction Symptoms CAUTION Any water left in the cooling lines may freeze during shipping and cause irreversible damage to the magnet coils Pack the magnet in the original shipping crate if possible Fasten i
24. or a particular purpose Specifically except as provided herein LakeShore undertakes no responsibility that the products will be fit for any particular purpose for which you may be buying the Products Any implied warranty is limited in duration to the warranty period No oral or written information or advice given by the Company its Agents or Employees shall create a warranty or in any way increase the scope of this limited warranty Some countries states or provinces do not allow limitations on an implied warranty so the above limitation or exclusion might not apply to you This warranty gives you specific legal rights and you might also have other rights that vary from country to country state to state or province to province Further with regard to the United Nations Convention for International Sale of Goods CISC if CISG is found to apply in relation to this agreement which is specifically disclaimed by Lake Shore then this limited warranty excludes warranties that a the Product is fit for the purpose for which goods of the same description would ordinarily be used b the Product is fit for any particular purpose expressly or impliedly made known to Lake Shore at the time of the conclusion of the contract c the Product is contained or packaged in a manner usual for such goods or in a manner adequate to preserve and protect such goods where it is shipped by someone other than a carrier hired by Lake Shore Lake Shore disclaims an
25. ry of the pole caps screw lengths vary with pole cap geometry See the table below for the correct screw length when attaching standard Lake Shore pole caps NOTE You may wish to Degauss the pole caps before removing them Residual magnetism may hold the pole caps in contact with the pole with enough force to make it difficult to separate them You can reduce residual magnetism to a minimum by alternately reversing the magnetic field polarity and gradually reducing the energizing current to near zero The pole caps are then easily removed from the pole caps using a wrench Use a light oil on the threads of the pole core CAUTION Handle the pole caps with care Deep dents or scratches on pole caps can impair the magnetic field homogeneity When installing the pole caps place a piece of soft material cardboard towel etc beneath them to prevent accidental damage if they fall during installation Operation 3 1 Lake Shore EM7 Electromagnet User s Manual Follow this procedure to replace a pole cap 1 2 3 Set power supply current output to zero Turn the power supply off Make certain you have the correct length of screws for the pole cap geometry you will be using The pole caps you want to install may have a different length than the ones on the electromagnet now See the table below to make certain you have the correct mounting screws omer pole cap face 5 16 18 screw length iameter 175 mm 7 in 7
26. s manual may be reproduced stored in a retrieval system or transmitted in any form or by any means electronic mechanical photocopying recording or otherwise without the express written permission of Lake Shore Revision 1 7 P N 119 622 15 February 2013 Lake Shore EM7 HV Electromagnet User s Manual TABLE OF CONTENTS Chapter Paragraph Title 1 INTRODUCTION ciutat aiii 1 0 Conrad A dida d della canes 1 1 General DESCIPION sitiado anni date ote At ASA da idas AO 2 INSTALLATION ona a A a aa seve 2 0 E acta ee Oe Se el ela ei ee ie eae 2 1 Site PIM xo ive iene Dl A 2 2 Cooling Water Requirements ccccconnnncccnnnocccnnnnononcnnnnno nn nn non cnn anna nn nr rn rn 2 3 UNPACKING ccoo eee on Rete age ee ee ag eee 2 4 O A O Bis 2 5 Installation ProGedure ae e a nd tibia 2 6 Return and Shipping Procedure cccccceeeeeeeeceeceeeeeeeeeceeeaeceeeeeeeececenaeceeeeeeesetsuceeeeeeeeeeeea 3 OPERATION 0000 A A ena Ok oa ee secon dates 3 0 General evcct sei a Sette e do de Meh ee tart reel 3 1 General Ehecks td dd es Oe Marne enka te eda eed 3 2 Operation PAE E E tts ei tte AE ty oils a ot te Smale daisy eet a 3 3 Pole Cap Replacement sci 2ah A ee eee eal eee A MAINTENANCE cucuta aida 4 0 General irene O 4 1 Adjusting the Pole Locking Lever Motion oooocoononcccnonoccccnonoccccconnonnnc nano ncnn naar arcano rar rrann rca 4 2 Rus ei 4 3 R st Removal aea ei Maasai die oh ee eee 44 Foreign Matter E RE EE A AE
27. t upright to a pallet large enough and rated to handle the magnet weight Use compressed air to force water out of the cooling lines in the coils CAUTION The coils freely rest on the poles To prevent damage fix coils in place during shipment Wedge padded wood blocks or high density foam between the coils to hold them against the magnet frame Protect the magnet by wrapping in heavy paper or plastic Seal with plastic tape Make a wood box large enough to cover the whole magnet without touching it and fasten it to the pallet Affix shipping labels FRAGILE warnings UPRIGHT labels and weight of the shipment on the outside of the crate Also write the RGA number on the outside of the shipping crate and on packing slip Use a shipping company that can handle the weight Installation 2 3 Lake Shore EM7 Electromagnet User s Manual Installation 3 0 3 1 3 2 3 3 Lake Shore EM7 HV Electromagnet User s Manual CHAPTER 3 OPERATION GENERAL Read the entire manual and check all instruments for proper operation prior to operating the system This chapter covers a general check in Paragraph 3 1 operation in Paragraph 3 2 pole caps in Paragraph 3 3 and locking screws in Paragraph 3 4 GENERAL CHECK Before operating the magnet verify proper electrical connections cooling water flow inlet pressure and temperature OPERATION The magnet power supply provides current to the magnet There are no operating controls on
28. tations or exclusions of some warranties stated above may not apply to you 13 Except to the extent allowed by applicable law the terms of this limited warranty statement do not exclude restrict or modify the mandatory statutory rights applicable to the sale of the product to you CERTIFICATION Lake Shore certifies that this product has been inspected and tested in accordance with its published specifications and that this product met its published specifications at the time of shipment The accuracy and calibration of this product at the time of shipment are traceable to the United States National Institute of Standards and Technology NIST formerly known as the National Bureau of Standards NBS TRADEMARK ACKNOWLEDGMENT Many of the designations used by manufacturers and sellers to distinguish their products are claimed as trademarks Where those designations appear in this manual and Lake Shore was aware of a trademark claim the designations have been printed in initial capital letters and the or symbol used CalCurve Carbon Glass Cernox Duo Twist High Temperature Cernox Gamma Probe SoftCal Quad Lead Quad Twist and Thermox are trademarks of Lake Shore Cryotronics Inc IDEAS is a trademark of Unisys Corporation and is licensed for use with Lake Shore software drivers Copyright 1995 1999 2001 2002 2004 and 2013 by Lake Shore Cryotronics Inc All rights reserved No portion of thi
29. witch leads If required the flow switch can be reconfigured for a normally closed N C Consult the flow switch manual for the procedure to accomplish changing the switch Appendix A Flow Switch Installation Lake Shore EM7 HV Electromagnet User s Manual Rear View Lt E Hose 5 8 inch I D Water Inlet f hae 1 foot minimum 9900000000800 Oleooooooooeoo o Either magnet hose connection may be used for water inlet and outlet To Power Supply Remote Inhibit i we DB 25 included only if Lake Shore Flow Switch set at 2 gom a MPS is part of system or Hoge Clamp 16 Adapter 3 4 NPT to 5 8 inch barb 2 Water Outlet C EM A 4 eps Figure A 2 EM7 Flow Switch Installation A5 0 EM7 FLOW SWITCH ADJUSTMENT The flow switch is set at the factory for 2 gpm and normally open N O operation The flow rate can Reed switch be adjusted in the field using the following LHE panza contact housing procedure See Figure A 3 White arrow mark 1 Loosen the friction plate screws to allow movement of the reed contact Red arrow mark NOTE Very small millimeter increments in either direction are all that is necessary to change flow cutoff point settings Plate screw 2 To reduce the flow cutoff point push the contact housing further into the housing 3 To increase the flow cutoff point pull the contact housing out from the housing Flow Please consult the flow switch users manual for direction
30. y warranties of technological value or of non infringement with respect to the Product and Lake Shore shall have no duty to defend indemnify or hold harmless you from and against Revision 1 7 P N 119 622 15 February 2013 Lake Shore EM7 Electromagnet User s Manual any or all damages or costs incurred by you arising from the infringement of patents or trademarks or violation or copyrights by the Product 10 THIS WARRANTY IS NOT TRANSFERRABLE This warranty is not transferrable 11 Except to the extent prohibited by applicable law neither Lake Shore nor any of its subsidiaries affiliates or suppliers will be held liable for direct special incidental consequential or other damages including lost profit lost data or downtime costs arising out of the use inability to use or result of use of the product whether based in warranty contract tort or other legal theory regardless whether or not Lake Shore has been advised of the possibility of such damages Purchaser s use of the Product is entirely at Purchaser s risk Some countries states and provinces do not allow the exclusion of liability for incidental or consequential damages so the above limitation may not apply to you 12 This limited warranty gives you specific legal rights and you may also have other rights that vary within or between jurisdictions where the product is purchased and or used Some jurisdictions do not allow limitation in certain warranties and so the above limi
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