Belt scales help maximize the use of raw materials, control in- ventories, and aid in the manufacturing of a consistent product.
68 pages
64 KB – 68 Pages
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Siemens WT 10 · 2014 4 4/2 Milltronics belt scales 4/2 Introduction 4/5 Milltronics MLC 4/10 Milltronics MBS 4/14 Milltronics MUS 4/19 Milltronics MCS 4/24 Milltronics MSI and MMI 4/32 Milltronics WD600 4/35 Speed sensors 4/35 Milltronics TASS 4/37 Milltronics RBSS 4/40 SITRANS WS100 4/45 SITRANS WS300 4/50 Milltronics bend pulleys 4/54 Belt scales accessories 4/54 Milltronics MWL weight lifter 4/59 Milltronics flat bar calibration weights 4/60 Milltronics test chains 4/68 Milltronics test chain storage reels 4/67 Milltronics belt scale peripherals Belt Scales WT10_English.book Seite 1 Freitag, 6. Juni 2014 1:41 13 © Siemens AG 2014
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4/2 Siemens WT 10 · 2014 Belt Scales Milltronics belt scales Introduction 4 Overview Belt scales help maximize the use of raw materials, control in- ventories, and aid in the manufacturing of a consistent product. Milltronics belt scales from Siemens are easy to install, and require little maintenance. They produce repeatable, accurate results. These belt scales show minimal hysteresis and superior linearity, and ignore side loading. Load cell overload protection is a feature of the belt scale design. Typical system A typical belt scale system has a weigh bridge structure sup- ported on load cells, an electronic integrator, and a belt speed sensor. The load cells measure the material weight on the belt, and send a signal to the integrator. The integrator also receives input in the form of electrical pulses from a belt speed sensor connected to a tail or bend pulley. Using these two sources of data, the integrator calculates the rate of material transferred along the belt using the equation weight x speed = rate. Belt scale operation Mode of operation SiemensMilltronics belt scales only measure the vertical com- ponent of the applied force. As material moves down the con- veyor belt and travels over the belt scale, it exerts a force pro- portional to the material load through the suspended idler directly to the load cells. The resulting force applied in each load cell is sensed by its strain gauges. When the strain gauges are excited by voltage from the electronic integrator, they produce an electrical signal proportional to belt loading, which is then ap- plied to the integrator. The vertical movement of the load cells is limited by the positive overload stop incorporated into the design of the belt scale or load cells. The stops protect the load cells from failure in the event of extreme overload forces. Installation tips Position the scale Locate the scale close to the tail section of the conveyor belt where tension is minimal and more consistent. Mount the scale on rigid mountings, away from equipment that may produce measurement disturbing vibrations. Avoid variable tension points, transition points, or slope change. The ideal location is a horizontal, even belt section, but you can achieve good results on slopes if the idlers are properly aligned. If the conveyor curves, locate the scale a proper distance from the tangent points of the curve. For concave curved conveyors, the recom- mended minimum distance is 12m (40ft) from the tangent points of the curve. With convex conveyors, the minimum dis- tance is 6m (20ft) on the approach side, and 12m (40ft) on the retreat side. Be sure to install the scale a sufficient distance from the infeed section (at least one idler space) so the material has time to settle properly on the belt. Reduce variable belt tension With temperature variations, load, and other circumstances, the belt tension will change. To maintain proper tension, a gravity take-up is recommended. This is a weight designed to take up slack on the belt. A gravity take-up should move freely and place consistent tension on the belt. The use of screw take-ups should be limited to conveyors with pulley centers to 18.3m (60ft) or less. The amount of weight should conform to the conveyor de- sign specifications. Align the idlers Precise idler alignment is essential. At least two idlers on each side of the scale should be aligned with the belt scale; use three or more for high accuracy applications. To check alignment, use wire, string, or fishing line across the top outer edges of the roll- ers and tighten enough to eliminate sag. Adjust the height of the rollers with shims until they are all even, or at least within ±0.8mm (1/32inch). All of the scale-area idlers should be the same type (size, diameter, style, trough angle, and manufacture) and should be spaced at equal distances. Locate training idlers a minimum of 9m (30ft) from the belt scale idler. Install speed sensors The speed sensor should be attached to the tail pulley or bend pulley shaft so the connection does not slip. It is important that the speed sensor be properly mounted as described in the op- erating instructions and free of excessive vibration. Whenever possible, mount the speed sensor on a solid face pulley. The use of wing- or beater-type pulleys is not recommended. Wheel driven speed sensors, that are applied to the return strand of the belt, should be located close to a return idler to en- sure a stable drive surface. Wire the scale Follow good instrumentation wiring practices to protect the load cell and speed sensor signals from radio frequency interference and induction. Use terminal blocks, shielded cable, and grounded metal conduit for all wiring. 1 2 3 3 1 2 Speed sensor Belt scale Weighing idler Material load Belt travel Remote total output Analog output Speed Load Total Rate Speed Load Integrator WT10_English.book Seite 2 Freitag, 6. Juni 2014 1:41 13 © Siemens AG 2014
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4/3 Siemens WT 10 · 2014 Belt Scales Milltronics belt scales Introduction 4 Application Belt Scale Application Questionnaire Remote totalizer Integrator Requirements Idler spacing: Tail pulley diameter: Belt width: Trough angle: Idler diameter: Pulley to pulley length: Idler Dia. Trough Angle Belt speed: Curved Variable InclineDegrees Degrees Incline / Decline Horizontal Electrical classification at scale location: No Yes Constant feed rate: Accuracy required: maximum minimum t/hr or kg/hr or lb/hr or LTPH or STPH Legal for trade Blending Control Load out Moderate High Corrosive state of material: Date: Notes on the Application: Prepared By: E-mail: State/Province: City: Country: Address: Company: Contact: Feed rate: 4 20 mA RS 232/RS 485 Modbus DeviceNet PROFIBUS DP Sketch attached (Supply sketch where possible) Material mm/inch mm/inch mm/inch mm/inch m/ft. maximum m/sec. or ft/min. minimum m/sec. or ft/min. Degrees mm/Inch/mesh Particle size: Inventory Material being measured: Application: Profile: Customer information Zip/Postal Code: Belt Scale Application Questionnaire Phone: Fax: ( ) ( ) Not corrosive Conveyor t/hr or kg/hr or lb/hr or LTPH or STPH Preferred Belt Scale Model: Products suggested: Relays (#): Load Cells (#): Inputs required:Outputs required: Communications: (indicate all that apply) Power available: Galvanized mild steel 316 SS 304 SS Painted mild steel Preferred Construction: 4 20 mA (specify) mm/inch mm/inch mm/inch Distance to infeed: Distance to discharge: m/ft. m/ft. Quantity required: www.siemens.com/processautomation © Siemens Milltronics Process Instruments Inc. Form# 2-406R17 WD600 MBSMSIMLC MMI MCS MUS % +/- PID PID Y = A = W = A Y W SIMATIC Modbus TCP/IP ProfiNet EtherNet/IP WT10_English.book Seite 3 Freitag, 6. Juni 2014 1:41 13 © Siemens AG 2014
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4/4 Siemens WT 10 · 2014 Belt Scales Milltronics belt scales Introduction 4 Technical specifications 1) 1) Accuracy subject to: On factory approved installations the belt scale system’s totalized weight will be within the specified ac curacy when compared to a known weighed material test sample. The test rate must be within the specified range of the design capacity and held constant for the duration of the test. The minimum material test sample must be equivalent to a sample obtained at the test flow rate for three revolutions of the bel t or at least ten minutes running time, whichever is greater. Accuracy 1) Criteria Typical industries Typical applications Maximum capacity Maximum belt speed Loading range Value Specified range Approvals Milltronics MLC †Animal feed †Fertilizers †Food processing †Tobacco †Secondary industries 50t/h (55STPH) at max. belt speed 2.0m/s (400fpm) Light ±0.51% 25100% CE, RCM, GOST-R Milltronics MBS †Aggregates †Mining †Animal feed †Aggregates †Medium-duty 1500t/h (1650STPH) at max. belt speed 3.0m/s (600fpm) Moderate ±1% 33100% CE, RCM, GOST-R Milltronics MUS †Aggregates †Agricultural †Mining †Cement †Aggregates †Medium- to heavy-duty 5000t/h (5500STPH) at max. belt speed 3.0m/s (600fpm) Light to heavy ±0.51% 25100% CE, RCM, GOST-R Milltronics MCS †Aggregates †Mobile crushers †Aggregates †Screening plants †Heavy-duty 2400t/h (2640STPH) at max. belt speed 3.0m/s (600fpm) Light to heavy ±0.51% 25100% CE, CSA/FM, ATEX, IECEx, RCM, GOST-R Milltronics MSI †Cement †Chemicals †Coal †Food processing †Mineral processing †Mining †Industrial heavy-duty †Custody transfer 12000t/h (13200STPH) at max. belt speed 5.0m/s (984fpm) Moderate to heavy ±0.5% or better 20100% SABS, MID, OIML, Measurement Canada, CE, CSA/FM, ATEX, IECEx, RCM, GOST-R Milltronics MMI †Cement †Chemicals coal †Food processing †Mineral processing †Mining †Industrial heavy-duty †Custody transfer 12000t/h (13200STPH) at max. belt speed 5.0m/s (984fpm) Moderate to heavy MMI-2 (2idler): ±0.25% or better MMI-3 (3idler): ±0.125% or better 20100% 2510% NTEP, MID, OIML, Measurement Canada, CE, CSA/FM, ATEX, IECEx, RCM, GOST-R WD600 †Food †Pharmaceuti- cal and tobacco industries †Process and load-out control †Light- to medium-duty Up to 100 t/h 2.0m/s (400fpm) maximum Light to moderate ±0.5–1% 25100% CE, meets FDA/USDA requirements for food processors, RCM, GOST-R WT10_English.book Seite 4 Freitag, 6. Juni 2014 1:41 13 © Siemens AG 2014
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4/5 Siemens WT 10 · 2014 Belt Scales Milltronics belt scales Milltronics MLC 4 Overview MilltronicsMLC is a low-capacity scale for light belt loading. Benefits †Unique parallelogram style load cell design †Designed for light product loading †Compact and easy to install †System includes weighing idler †Stainless steel option †Low cost of ownership Application The MLC is suitable for monitoring such products as fertilizer, tobacco, animal feed pellets, or sugar. The MLC™s proven use of parallelogram style load cells results in fast reaction to vertical forces, ensuring instant response to product loading. This enables it to provide outstanding accuracy and repeatability even with very light loading. The MLC may be easily installed in existing flat belt conveyors or belt feeders. Operating with MilltronicsBW500, or SIWAREXFTC micropro- cessor-based integrators, the MLC provides indication of flow rate, total weight, belt load and belt speed of bulk solids materi- als on a belt conveyor. A speed sensor monitors conveyor belt speed for input to the integrator. When used in conjunction with MilltronicsBW500 integrator with PID controller, the MLC may also be used in the food industry as part of a pre-feed control system for extruders, cookers and de-hydrators. WT10_English.book Seite 5 Freitag, 6. Juni 2014 1:41 13 © Siemens AG 2014
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4/6 Siemens WT 10 · 2014 Belt Scales Milltronics belt scales Milltronics MLC 4 Technical specifications 1) 2) 1) Accuracy subject to: On factory approved installations the belt scale system™s totalized weight will be within the specified ac curacy when compared to a known weighed material test sample. The test rate must be within the specified range of the design capacity and held constant for the duration of the test. The minimum material test sample must be equivalent to a sample obtained at the test flow rate for three revolutions of the bel t or at least ten minutes running time, whichever is greater. 2) Contact Siemens application engineering ( factorysupport.smpi@siemens.com ) for consideration of higher belt speeds. Milltronics MLC Mode of operation Measuring principle Strain gauge load cell measuring load on flat belt conveyor idler Typical application Monitor fertilizer, tobacco, animal feed pellets, sugar, cereal Performance Accuracy 1) ±0.5–1.0% of totalization over 25–100% operating range Medium conditions Max. material temperature 85°C (185°F) Belt design Belt width †450–1200mm †18–48inch Belt speed 2.0m/s (400fpm) maximum 2) Capacity Up to 50t/h (55STPH) Conveyor incline †±20° from horizontal, fixed incline †Up to ±30° with reduced accuracy Idlers Conveyor idler Horizontal Idler diameter 50 or 60mm (1.90 or 2.30inch) Idler spacing 0.5–1.5m (1.6–5.0ft) Load cell Construction 17-4PH (1.4568) stainless steel construction with 304 (1.4301) stainless steel cover Degree of protection IP67 Cable length 3 m (10 ft) Excitation 10VDC nominal, 15VDC maximum Output 2mV/V excitation at rated load cell capacity Non-linearity 0.03% of rated output Hysteresis 0.05% of rated output Non-repeatability 0.03% of rated output Capacity 10 or 20lb Overload 150% of rated capacity, ultimate 300% of rated capacity Temperature †-40–+85°C (-40 +185°F) operating range †-10–+60°C (14–140°F) compensated Mounting dimensions Identical for all capacities Hazardous locations Consult the factory Approvals CE, RCM, GOST-R Milltronics MLC WT10_English.book Seite 6 Freitag, 6. Juni 2014 1:41 13 © Siemens AG 2014
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4/8 Siemens WT 10 · 2014 Belt Scales Milltronics belt scales Milltronics MLC 4 Dimensional drawings MLC dimensions in mm (inch) For pan supported belts, the belt should be cut out to allow the MLC and at least two (preferably four) other idlers to be inst alled. ‘E’ dimension ‘D’ dimension ‘C’ dimension ‘B’ dimension ‘A’ roller width Scale size Metric designs [dimensions in mm (inch)] ‘E’ dimension ‘D’ dimension ‘C’ dimension ‘B’ dimension ‘A’ roller width Scale size Imperial designs [dimensions in inch (mm)] Front View Plan View Installation 20.6 (0.81) Idler diameter C (location of removed idler) MLC belt scale 1.90 (48.3) 1.90 (48.3) 1.90 (48.3) 1.90 (48.3) 1.90 (48.3) 1.90 (48.3) 1) B A E 96 (3.78) 158 (6.22) 60 (2.36) 1 250 (49.21) 1 200 (47.24) 1 200 (47.24) 96 (3.78) 158 (6.22) 60 (2.36) 1 050 (41.34) 1 000 (39.37) 1 000 (39.37) 96 (3.78) 158 (6.22) 50 (1.97) 850 (33.46) D 800 (31.50) 800 (31.50) 96 (3.78) 158 (6.22) 50 (1.97) 700 (27.56) 650 (25.59) 650 (25.59) 96 (3.78) 158 (6.22) 50 (1.97) 550 (21.65) 500 (19.69) 1) 500 (19.69) 96 (3.78) 158 (6.22) 50 (1.97) 500 (19.69) 450 (17.72) 450 (17.72) 49 (1 245) 48 (1 219) 48 (1 219) 43 (1 092) 64 (2.5) 42 (1 067) 42 (1 067) 37 (940) 36 (914) 36 (914) 31 (787) 30 (762) 30 (762) 25 (635) 24 (610) 24 (610) 19 (483) 18 (457) 18 (457) 4 x Ø11 (0.44) 3.5 (89) 6.19 (157) 3.5 (89) 6.19 (157) 3.5 (89) 6.19 (157) 3.5 (89) 6.19 (157) 3.5 (89) 6.19 (157) 3.5 (89) 6.19 (157) WT10_English.book Seite 8 Freitag, 6. Juni 2014 1:41 13 © Siemens AG 2014
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4/9 Siemens WT 10 · 2014 Belt Scales Milltronics belt scales Milltronics MLC 4 Schematics MLC connections Customer junction box To integrator Shield ‘B’ Shield ‘A’ Green ‘B’ Green ‘A’ Red ‘B’ Red ‘A’ White ‘B’ White ‘A’ Black ‘B’ Black ‘A’ Shield Load cell ‘A’ Load cell ‘B’ Note: Conduit and cable arrangement may differ from example shown. Conduit and box connector A 5 : 1 A + SIG ‘A’ – SIG ‘A’ + SIG ‘B’ – SIG ‘B’ + EXC – EXC WT10_English.book Seite 9 Freitag, 6. Juni 2014 1:41 13 © Siemens AG 2014
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4/10 Siemens WT 10 · 2014 Belt Scales Milltronics belt scales Milltronics MBS 4 Overview MilltronicsMBS is a basic, modular, medium-duty belt scale pro- viding dynamic weighing information for process indication. Idler not included with belt scale. Benefits †Unique modular design †Simple installation †Low cost †Easy retrofit Application MilltronicsMBS is used with aggregates, sand, or minerals, ani- mal feeds or grains, providing basic continuous in-line weighing at a minimal cost. With no cross bridge, this versatile unit will fit most conveyor widths and standard idlers, and product buildup is reduced. The construction and easy assembly of the MBS ensure quick delivery to meet even the tightest of schedules. Where scales are moved from conveyor to conveyor, the MBS also provides unmatched flexibility. Operating with MilltronicsBW500, or SIWAREXFTC micropro- cessor-based integrators, the MBS provides indication of flow rate, total weight, belt load, and speed of bulk solids materials on a belt conveyor. A speed sensor monitors conveyor belt speed for input to the integrator. WT10_English.book Seite 10 Freitag, 6. Juni 2014 1:41 13 © Siemens AG 2014
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4/11 Siemens WT 10 · 2014 Belt Scales Milltronics belt scales Milltronics MBS 4 Technical specifications 1) 2) 3) 1) Accuracy subject to: On factory approved installations the belt scale system™s totalized weight will be within the specified ac curacy when compared to a known weighed material test sample. The test rate must be within the specified range of the design capacity and held constant for the duration of the test. The minimum material test sample must be equivalent to a sample obtained at the test flow rate for three revolutions of the bel t or at least ten minutes running time, whichever is greater. 2) Contact Siemens application engineering ( factorysupport.smpi@siemens.com ) for consideration of higher belt speeds. 3) Review by Siemens application engineer required. Milltronics MBS Mode of operation Measuring principle Heavy duty strain gauge load cells measuring load on belt conveyor idlers Typical applications †Monitor feed rates of fractionated stone, sand, animal feeds, grains †Track daily production totals Performance Accuracy 1) ±1% of totalization over 33–100% operating range, application dependent Medium conditions Max. material temperature 70°C (158°F) Belt design Belt width †Standard duty up to 1000mm (CEMA width up to 42inch) †Refer to dimensional drawing Belt speed Up to 3.0m/s (600fpm) 2) Capacity Up to 1500t/h (1650STPH) at maximum belt speed Conveyor incline †±20° from horizontal, fixed incline †Up to ±30° with reduced accuracy 3) Idlers Idler profile †Flat to 35° †To 45° with reduced accuracy 3) 50–150mm (2–6inch) Idler diameter 50–150mm (2–6inch) Idler spacing 0.6–1.5m (2.0–5.0ft) Load cell Construction Aluminum Degree of protection IP66 Cable length 3 m (10 ft) Excitation 10VDC nominal, 15VDC max. Output 2±0.02mV/V excitation at rated load cell capacity Non-repeatability 0.01% of rated output Non-linearity 0.02% of rated output Hysteresis 0.02% of rated output Capacity 30, 50, 100kg (66, 110, 220lb) Overload 150% of rated capacity, ultimate 200% of rated capacity Temperature †-30–+70°C (-22–+158°F) operating range †-10–+40°C (15–105°F) compensated Weight 12kg (26lb), 6kg (13lb) per side Interconnection wiring (to integrator) †<150m (500ft) 18AWG (0.75mm²) 6conductor shielded cable †>150m (500ft) to 300m (1000ft) 18–22 AWG (0.75–0.34mm²) 8 conductor shielded cable Hazardous locations Consult the factory Approvals CE, RCM, GOST-R Milltronics MBS WT10_English.book Seite 11 Freitag, 6. Juni 2014 1:41 13 © Siemens AG 2014
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