Instruction Manual October milltronics MD-36 SPEED SENSOR
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1 Instruction Manual October 2007 milltronics MD-36 SPEED SENSOR
2 Safety Guidelines: Warning notices must be observed to ensure personal safety as well as that of others, and to protect the product and the connected equipment. These warning notices are accompanied by a clarification of the level of caution to be observed. Qualified Personnel: This device/system may only be set up and operated in conjunction with this manual. Qualified personnel are only authorized to install and operate this equipment in accordance with established safety practices and standards. Unit Repair and Excluded Liability: The user is responsible for all changes and repairs made to the device by the user or the user s agent. All new components are to be provided by Siemens Milltronics Process Instruments Inc. Restrict repair to faulty components only. Do not reuse faulty components. Warning: This product can only function properly and safely if it is correctly transported, stored, installed, set up, operated, and maintained. Note: Always use product in accordance with specifications. Copyright Siemens Milltronics Process Instruments Inc All Rights Reserved This document is available in bound version and in electronic version. We encourage users to purchase authorized bound manuals, or to view electronic versions as designed and authored by Siemens Milltronics Process Instruments Inc. Siemens Milltronics Process Instruments Inc. will not be responsible for the contents of partial or whole reproductions of either bound or electronic versions. Disclaimer of Liability While we have verified the contents of this manual for agreement with the instrumentation described, variations remain possible. Thus we cannot guarantee full agreement. The contents of this manual are regularly reviewed and corrections are included in subsequent editions. We welcome all suggestions for improvement. Technical data subject to change. MILLTRONICS is a registered trademark of Siemens Milltronics Process Instruments Inc. Contact SMPI Technical Publications at the following address: Technical Publications Siemens Milltronics Process Instruments Inc Technology Drive, P.O. Box 4225 Peterborough, Ontario, Canada, K9J 7B1 techpubs.smpi@siemens.com For a selection of Siemens Milltronics level measurement manuals, go to: www. siemens.com/processautomation. Under Process Instrumentation, select Level Measurement and then go to the manual archive listed under the product family. For a selection of Siemens Milltronics weighing manuals, go to: www. siemens.com/processautomation. Under Weighing Technology, select Continuous Weighing Systems and then go to the manual archive listed under the product family. Siemens Milltronics Process Instruments Inc. 2007
3 Table of Contents Safety Notes...1 Safety Marking Symbols...1 The Manual...2 Technical Support...2 Milltronics MD-36 Speed Sensor...3 Specifications...4 Operation...6 MD-36/MD-36A Operation...6 MD-36 IS Operation...6 Dimensions...7 Aluminum Enclosure...7 Stainless Steel Enclosure...9 Mounting Floating Pulley Mount...11 Fixed Shaft Mount...13 Interconnection MD-36 Speed Sensor/Integrator Connection...14 MD-36 IS Speed Sensor/Isolator/Integrator Connection...15 Wiring Diagram (MD-36 IS only)...15 Maintenance Hazardous Area Installations Product Nameplate...17 Instructions Specific to Hazardous Area Installations...18 i
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5 Safety Notes 1 Special attention must be paid to warnings and notes highlighted from the rest of the text by grey boxes. WARNING: relates to a caution symbol on the product, and means that failure to observe the necessary precautions can result in death, serious injury, and/or considerable material damage. WARNING 1 : means that failure to observe the necessary precautions can result in death, serious injury, and/or considerable material damage. Note: means important information about the product or that part of the operating manual. Safety Marking Symbols In manual: On product: Description WARNING: refer to accompanying documents (manual) for details. 1. This symbol is used when there is no corresponding symbol on the product. 7ML19985DB02 Milltronics MD-36 Speed Sensor INSTRUCTION MANUAL Page 1
6 The Manual This instruction manual covers the installation, operation and maintenance of the MD-36 speed sensor. We strongly recommend that you read this manual, and any manual for a product used in conjunction with the MD-36 (such as a belt scale integrator), for proper installation and operation of any component of the weighing system. Adhering to the installation and operating procedures ensures a quick, trouble-free installation and allows for the maximum accuracy and reliability of your weighing system. Integrator and speed sensor instruction manuals are available for download from We always welcome suggestions and comments about manual content, design, and accessibility. Please direct your comments to techpubs.smpi@siemens.com. Technical Support Support is available 24 hours a day. To find your local Siemens Automation Office address, phone or fax number go to: Click on the tab Contacts by Product and then find your product group (+Process Automation > +Weighing Technology). Select the team Technical Support. Click on Next. Click on the appropriate continent, then select the country followed by the city. Click on Next. For on-line technical support go to: Enter the device name (MD-36) or order number, then click on Search, and select the appropriate product type. Click on Next. You will be prompted to enter a keyword describing your issue. Then either browse the relevant documentation, or click on Next to a detailed description of your issue to Siemens Technical Support staff. Siemens A&D Technical Support Center: phone fax Page 2 Milltronics MD-36 Speed Sensor INSTRUCTION MANUAL 7ML19985DB02
7 Milltronics MD-36 Speed Sensor The Milltronics MD-36 speed sensor is certified for use in hazardous and non-hazardous locations. The sensor, coupled to the motor or pulley shaft, converts the rotation of its input shaft into an encoded speed signal. The speed signal is transmitted to the integrating electronics for use in calculating the rate of material flow. Siemens provides a full range of electronic integrators: Milltronics BW 100 Milltronics BW 500 The MD-36 sensors can also be used with older model Siemens integrators: Compuscale Compuscale II Compuscale IIA Compuscale III Compu-M For further information about Siemens products, go to 7ML19985DB02 Milltronics MD-36 Speed Sensor INSTRUCTION MANUAL Page 3
8 Specifications Power MD-36/MD-36A: +15 V DC, 25 ma from integrator MD-36 IS: +5 V to +25 V DC from IS Switch Isolator Temperature 40 to +55 C ( 40 to +130 F) Input shaft rotation 0 to 2,000 rpm, bi-directional Output MD-36/MD-36A: open collector sinking output, max. 25 ma at 15 V DC 36 pulses / revolution 0 to 2,000 rpm = 0 to 1200 Hz MD-36 IS: load current: 0 to 15 ma 36 pulses per revolution 0 to 2000 rpm = 0 to 1200 Hz Input: Output 1:1 (speed ratio) Enclosure MD-36 and MD-36 IS: aluminum, rated NEMA 4/Type4/IP 65; 304 stainless steel MD-36A: aluminum; 304 stainless steel Page 4 Milltronics MD-36 Speed Sensor INSTRUCTION MANUAL 7ML19985DB02
9 Approvals MD-36: US/Canada CSA/FM Class II, Div. 1, Groups E, F, G, and Class III Europe ATEX II 2D, Ex td A21 IP65 T70 C CE MD-36 IS: US/Canada CSA/FM (with suitable IS Switch Isolator or Switch Amplifier): Class I, Div. 1, Groups A, B, C, D; Also Class II, Div. 1, Groups E, F, G system approval Europe ATEX II 2G, EEx ia IIC T6 (with suitable IS Switch Isolator) CE MD-36A: Europe CE Switch and Isolator Approvals Note: The Approval Ratings for the Proximity Switch and the IS Switch Isolator are the property of Pepperl+Fuchs. Copies of these Approval Certificates may be obtained at Proximity Switch Approval Ratings (Pepperl+Fuchs #SJ3.5-N) ATEX: II 2G, EEx ia IIC T6 (with suitable IS Switch Isolator) 1 CSA/FM (with suitable IS Switch Isolator or Switch Amplifier): Class I, Div. 1, Groups A, B, C, D; Also Class II, Div. 1, Groups E, F, G system approval IS Switch Isolator (Pepperl+Fuchs #KFA5-SOT2-Ex2 and #KFA6-SOT2-Ex2) ATEX: II 1G, [EEx ia] IIC CSA/FM: Class I, Div. 1, Groups A, B, C, D; Also Class II, Div. I, Groups E, F, G. Cable (optional) Belden 8770, 3 wire shielded, 0.82 mm 2 (18 AWG) or equivalent max. run 305 m (1000 ft) 1. Based on the ATEX rating of the NAMUR slotted sensor and CSA/FM system approvals. 7ML19985DB02 Milltronics MD-36 Speed Sensor INSTRUCTION MANUAL Page 5
10 Operation The speed sensor consists of a main shaft rotating in a bearing assembly fixed to the enclosure. The shaft turns a toothed disk divided into 36 teeth, each separated by a gap equal to the tooth width. In the MD-36/MD-36A, the encoder card is mounted so that the two optocouplers straddle the disk s teeth. MD-36/MD-36A Operation Power from the integrating device energizes the two optocoupler LEDs and feeds the 5 V DC regulator. The 5 V DC bus powers the logic circuitry and the output driver transistors. As the shaft rotates, the 36-tooth wheel modulates the light crossing within each optocoupler. The resulting outputs are two 50% duty cycle square waves that are phase shifted by 90 degrees electrical or ¼ cycle (one cycle of 360 degrees electrical corresponds to the width of one tooth and one gap). This configuration provides directional discrimination. The square wave outputs of the optocoupler are converted into clockwise (CW) and counterclockwise (CCW) square wave output signals by the intermediate logic. When the shaft rotates in a CW direction, the logic produces pulses at the CW output and the CCW output is disabled. When the shaft rotates in a CCW direction, the logic produces pulses at the CCW output and the CW output is disabled. The speed sensor is immune to any external vibration that would cause the toothed wheel to oscillate ¼ cycle (½ tooth width or 5 of shaft rotation) or less. MD-36 IS Operation The MD-36 IS Speed Sensor contains a Pepperl + Fuchs, NAMUR rated, inductive proximity sensor, model # SJ3.5-N, consisting of an oscillator and a coil. The oscillator creates a fequency which is emitted from the coil and out the face of the sensor. When a metal target enters this radiated field, eddy currents are indicated on this target. As the target moves closer to the sensor, the energy required from the oscillator increases. The IS switch isolator monitors the change in the oscillator load, triggering the output when a predetermined level is reached. Page 6 Milltronics MD-36 Speed Sensor INSTRUCTION MANUAL 7ML19985DB02
11 Dimensions Aluminum Enclosure Front View 71 mm (2.8 ) 142 mm (5.6 ) 71 mm (2.8 ) 1/2 NPT plug (two places) 142 mm (5.2 ) 218 mm (8.6 ) 56 mm (2.2 ) 112 mm (4.4 ) 7ML19985DB02 Milltronics MD-36 Speed Sensor INSTRUCTION MANUAL Page 7
12 Side View 117 mm (4.6 ) 61 mm (2.4 ) 16 mm (0.63 ) Ø shaft 84 mm (3.3 ) 124 mm (4.9 ) ref. 61 mm (2.4 ) 21mm (0.8 ) 213 mm (8.4 ) 114 mm (4.5 ) 6 mm (0.25 ) Ø shaft (two places) Page 8 Milltronics MD-36 Speed Sensor INSTRUCTION MANUAL 7ML19985DB02
13 Stainless Steel Enclosure Front View 19 mm (0.75 ) 76 mm (3.0 ) 152 mm (6.0 ) 152 mm (6.0 ) 76 mm (3.0 ) 239 mm (9.4 ) cable connector for 3 to 9 mm (0.125 to 0.25 ) o.d. cable 38 mm (1.5 ) 51 mm (2.0 ) 102 mm (4.0 ) 7ML19985DB02 Milltronics MD-36 Speed Sensor INSTRUCTION MANUAL Page 9
14 Side View 127 mm (5.0 ) 61 mm (2.4 ) 16 mm (0.63 ) Ø shaft 86 mm (3.4 ) 127 mm (5.0 ) (ref.) 76 mm (3.0 ) 21 mm (0.8 ) 216 mm (8.5 ) 114 mm (4.5 ) 6 mm (0.25 ) Ø shaft (two places) Page 10 Milltronics MD-36 Speed Sensor INSTRUCTION MANUAL 7ML19985DB02
15 Mounting WARNING: If the equipment is likely to come into contact with aggressive substances, then it is the responsibility of the user to use suitable precautions that prevent it from being adversely affected. The MD-36 speed sensor models can be coupled to a tail pulley, bend pulley, or motor shaft. There are two methods of attaching the sensor: floating and fixed. Floating Pulley Mount The input shaft and bearing assembly bear the weight of the speed sensor. The unit s arresting bracket stops the speed sensor from rotating with the shaft. The arresting bracket straddles a section of angle iron installed by the customer. Ensure the anti-rotation spring is fastened in place. see Pulley Shaft on page 12 pulley shaft MD-36 series B B Arresting bracket. Shorten if required. See Arresting Bracket on page12. spring angle iron (customer supplied) Notes: When mounting the speed sensor, ensure that the shaft alignment is true to avoid stresses on the shaft bearing. For preferred mounting locations, refer to the associated belt scale or weigh feeder application drawings. 7ML19985DB02 Milltronics MD-36 Speed Sensor INSTRUCTION MANUAL Page 11
16 Pulley Shaft M8 or 5/16-18 UNC set screw (customer supplied) 64 mm (2.5 ) 25 mm (1 ) 16 mm (0.630 ) min mm (0.633 ) max..254mm (.010") A A Arresting Bracket (B-B Cross Section) 127 mm (5 ) (approx) secure with hook or bolt angle iron arresting bracket anti-rotation spring Notes: When tail or bend pulley is not supplied by Siemens, machining on tail/bend pulley shaft (see Pulley Shaft above) to accommodate Milltronics speed sensor is done by customer. Arresting bracket is an anti-rotation device only and must not secure or support the speed sensor. Bearing life is greatly reduced if speed sensor is not free to "float." Use anti-rotation spring to prevent mechanical oscillation of speed sensor. Grease mating surfaces to prevent seizing. Page 12 Milltronics MD-36 Speed Sensor INSTRUCTION MANUAL 7ML19985DB02
17 Fixed Shaft Mount Side View motor shaft rubber hose hose clamp (typ) 16 mm (0.63 ) Ø shaft motor MD-36 Series 0.8 mm (0.03) max. shaft offset 13 mm (0.5 ) optimum dimension customer supplied mounting bracket (remove supplied arresting bracket) guard (to suit) Front View shaft rotation C W 8 mm (0.313 ) two places C C W 7ML19985DB02 Milltronics MD-36 Speed Sensor INSTRUCTION MANUAL Page 13
18 Interconnection Notes: Installation shall be performed only by qualified personnel in accordance with local governing regulations. Flexible conduit is recommended so excess stress is not applied to the shaft bearings. Use appropriate conduit and conduit fittings or cable glands to maintain NEMA or IP rating. Interconnection between the speed sensor and the integrator should be made with 3-wire shielded, 18 AWG cable (Belden 8770 or equivalent). Ground the shield at the integrator ONLY! MD-36 Speed Sensor/Integrator Connection MD-36 BW 100 BW 500 Description Terminal TB1 TB V DC Speed Out (CW) 1 2 (7) 2 (16) 2 Speed Out (CCW) 3 (7) 2 (16) 2 Common Ground G N/C 3 N/C 3 1. To determine direction of rotation, see Front View mounting on page Terminal positions in brackets denote that only one signal may be connected at one time. 3. N/C = No Connection Page 14 Milltronics MD-36 Speed Sensor INSTRUCTION MANUAL 7ML19985DB02
19 MD-36 IS Speed Sensor/Isolator/Integrator Connection MD-36 IS IS Switch Isolator (P&F #KFA5-S0T2-Ex2) BW 100 BW 500 Terminal Terminal TB1 TB Wiring Diagram (MD-36 IS only) Hazardous Area Siemens MD-36 IS S I G S I G Non-Hazardous Area IS Switch Isolator (Pepperl+Fuchs #KFA5-SOT2-Ex2 (customer supplied) S E I X G C 115 Vac See Note below. 2 conductor, 18 AWG shielded cable (customer supplied) Siemens Integrator SIG EXE- SHLD BW 500 BW 100 Refer to integrator installation diagram. Note: The 115 V version is shown. If 230 V is required, use isolation barrier Pepperl + Fuchs #KFA6-SOT2-Ex2. 7ML19985DB02 Milltronics MD-36 Speed Sensor INSTRUCTION MANUAL Page 15
20 Maintenance The speed sensor electronics do not normally require maintenance; however, a program of periodic checks would be beneficial. The enclosure and circuit board, or NAMUR sensor should be cleaned if necessary (only when the power is disconnected), using a vacuum cleaner and a clean, dry paint brush. Check all electrical contacts for corrosion and arcing. The speed sensor bearing should be periodically checked for corrosion, wear and seizing. The bearing s life is dependent upon the mounting, the severity of the application, and surrounding environment. If the bearings exhibit excess play or produce an unreasonably loud sound, the speed sensor should be returned to Siemens for repair. WARNING: Do not remove cover when an explosive dust atmosphere is present. Page 16 Milltronics MD-36 Speed Sensor INSTRUCTION MANUAL 7ML19985DB02
21 Hazardous Area Installations Product Nameplate Note: The nameplate shown is a typical example. Please check the nameplate on your device for your specific device configuration. 7ML19985DB02 Milltronics MD-36 Speed Sensor INSTRUCTION MANUAL Page 17
22 Instructions Specific to Hazardous Area Installations (Reference European ATEX Directive 94/9/EC, Annex II, 1/0/6) The following instructions apply to equipment covered by certificate number Sira 06ATEX9304X: 1. For use and assembly, refer to the main instructions. 2. The equipment is certified for use as Category 2D equipment and may be used in hazardous zones 21 and 22 with dusts. 3. This equipment has a maximum surface temperature of T70 C (in a +55 C ambient). Refer to the applicable code of practice for selection of this equipment with respect to specific dust ignition temperatures. 4. The equipment is certified for use in an ambient temperature range of -40 C to +55 C. 5. Any cable or conduit entries must meet the requirements of European Directive 94/9/EC for Group II, Category 2D. 6. Cable should be selected in accordance with the applicable code of practice and such that its insulation can withstand the maximum surface temperature of the enclosure (T70 C). 7. The equipment has not been assessed as a safety related device (as referred to by Directive 94/9/EC Annex II, clause 1.5). 8. Installation and inspection of this equipment shall be carried out by suitably trained personnel in accordance with the applicable code of practice. 9. Repair of this equipment shall be carried out by suitably trained personnel in accordance with the applicable code of practice. 10. Components to be incorporated into or used as replacements in the equipment shall be fitted by suitably trained personnel in accordance with the manufacturer s documentation. 11. If the equipment is likely to come into contact with aggressive substances, then it is the responsibility of the user to take suitable precautions that prevent it from being adversely affected, thus ensuring that the type of protection is not compromised. - Aggressive substances: for example, acidic liquids or gases that may attack metals or solvents that may affect polymeric materials - Suitable precautions: for example, regular checks as part of routine inspections or establishing from the material s data sheet that it is resistant to specific chemicals 12. Product marking shall include the warning: Do not open when an explosive dust atmosphere is present. Special Conditions for Safe Use The X suffix to the certificate number relates to the following special condition(s) for safe use: Cable or conduit entries shall comply with the requirements of the European Directive 94/9/EC for Group II, Category 2D and maintain the overall IP rating of the enclosure. Page 18 Milltronics MD-36 Speed Sensor INSTRUCTION MANUAL 7ML19985DB02
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24 Siemens Milltronics Process Instruments Inc. 1954Technology Drive, P.O. Box 4225 Peterborough, ON, Canada K9J 7B1 Tel: (705) Fax: (705) Siemens Milltronics Process Instruments Inc Subject to change without prior notice *7ml19985DB02* Printed in Canada Rev. 2.0
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