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Siemens SIWAREX WL280 Operating Instructions Manual Download Page 24

Application planning 

 

4.4 Overload protection 

 

RN-S SA 

24

 

Operating Instructions, 09/2016, A5E32605810A-03 

If the transverse force is so great that it exceeds the restoring force of the pendulum bolt 

(and thus the deflection limit), then corresponding protective measures are required. 

Pendulum limiters or guide elements are suitable for this, for example. 
Pendulum limiters must be constructed or set in such a way that the maximum deflection 

cannot be exceeded in any direction. This is shown in two examples in the following figure. 

 

Figure 4-2 

Pendulum limitation with a maximum deflection of 4 mm as exemplified by two weighing 

platforms 

Pendulum limiters are integrated in the RN-S SA compact installation units. 

Summary of Contents for SIWAREX WL280

Page 1: ...__________ ___________________ ___________________ SIWAREX WL280 Compact installation units and guide elements RN S SA Operating Instructions 09 2016 A5E32605810A 03 Introduction 1 Notes on handling the product 2 Description 3 Application planning 4 Mounting 5 Service and maintenance 6 Technical data 7 Dimension drawings 8 Ordering data 9 Appendix A ...

Page 2: ... may be operated only by personnel qualified for the specific task in accordance with the relevant documentation in particular its warning notices and safety instructions Qualified personnel are those who based on their training and experience are capable of identifying risks and avoiding potential hazards when working with these products systems Proper use of Siemens products Note the following W...

Page 3: ... the compact installation unit 14 3 2 2 Design and function of the grounding cable 18 3 2 3 Design and principle of operation of the guide element 19 4 Application planning 21 4 1 Load cell dummies 21 4 2 Lifting protection 21 4 3 Load pick up 22 4 4 Overload protection 23 4 5 Guide elements 25 4 6 Protection against explosion 26 5 Mounting 27 5 1 Safety information instructions 27 5 2 Installing ...

Page 4: ...5 Lowering the top plate onto the load cells 41 5 3 6 Fixing of second guide element 42 5 3 7 Checking the installation 42 5 4 Dismantling 43 6 Service and maintenance 45 6 1 Servicing and maintenance 45 7 Technical data 47 7 1 Stainless steel compact installation units 47 7 2 Stainless steel guide elements 47 8 Dimension drawings 49 8 1 Dimension drawings of the compact installation units 49 8 2 ...

Page 5: ...evice mechanically and commission it as well as at service and maintenance engineers 1 2 History The following versions of this documentation have been released to date The changes apply to the previous version Table 1 1 History Edition Comment change 09 2014 Initial release 05 2015 Corrections in measurement tables 09 2016 Corrections in measurement tables 1 3 Scope of delivery The scope of deliv...

Page 6: ... scope of delivery information Drawings of the parts of the compact installation unit can be found in Section Preparing the compact installation unit Page 30 1 3 2 Guide element 2 x flanges 1 x turnbuckle complete Accessory kit for RN S SA 60 kg to 280 kg RN S SA 0 5 t 1 t RN S SA 2 t to 5 t 2 x hexagon bolts 2 x hexagon nuts 4 x washers 4 x cylinder head screws Accessory kit for RN S SA 10 t 13 t...

Page 7: ...use of firewalls and network segmentation in place Additionally Siemens guidance on appropriate security measures should be taken into account For more information about industrial security please visit http www siemens com industrialsecurity Siemens products and solutions undergo continuous development to make them more secure Siemens strongly recommends to apply product updates as soon as availa...

Page 8: ...Introduction 1 5 Environmental protection RN S SA 8 Operating Instructions 09 2016 A5E32605810A 03 ...

Page 9: ...ations on the part of Siemens AG are contained in the respective sales contract which also contains the complete and solely applicable liability provisions The provisions defined in the sales contract for the responsibility for defects are neither extended nor limited by the remarks in this document Delivery information The current scope of delivery is listed on the shipping documents enclosed wit...

Page 10: ...se appropriate safety equipment according to the standards for safety engineering In the case of devices with explosion protection qualified persons must be trained instructed and authorized to perform work on electrical circuits in plants subject to explosion hazards Protection against explosion There is no potential risk of ignition from the installation units of the load cells Therefore they ar...

Page 11: ...llation of the load cell It is not necessary to strip down the compact installation unit It is not necessary to remove the compact installation unit The compact installation unit can be used as dummy The top plate is secured by means of two countersunk head screws As a result of the two countersunk head screws the position of the top plate with regard to the base plate is adjusted ideally The load...

Page 12: ...compact installation unit for load cells is especially well suited for installation in container scales platform scales and roller table scales 3 1 2 Lifting protection The lifting protection prevents the load bearing implements from being lifted off the load cells If there is a risk of the load bearing implement being lifted or toppled then lifting protection is required This is required in the c...

Page 13: ...mic weighing procedures or if containers are weighed outdoors where wind can have an effect Movement of the load bearing implement as a result of horizontal forces should be prevented This is the case with braking or acceleration forces of belt or roller table scales or with mixing tanks in which unbalance can occur as a result of an agitator The SIWAREX WL280 RN S SA guide elements are used toget...

Page 14: ...lements 3 2 Design and function 3 2 1 Design and mode of operation of the compact installation unit Design The compact installation unit comprises the following main components Base plate Top plate Pendulum support Two countersunk head screws as aids to installation and adjustment Together with the load cell the compact installation unit represents a self centering bearing unit ...

Page 15: ...screws Pendulum support Centering washers Load cell not included in scope of deliv ery Hexagon nut Spring washers Grounding cable Half length taper grooved pins Plug Figure 3 2 Exploded view compact installation unit with built in load cell Principle of operation The top plate is exactly aligned and secured through the base plate using the two countersunk head screws This results in a stable unit ...

Page 16: ...essure piece are secured in position using one clamping washer each In the next step the complete compact installation units are fitted into the scale The fixing holes of the compact installation unit are 6 mm larger than the thread of the fixing screws to be used The fixing holes are covered by the supplied spring washers Tolerance errors in the fixing holes of the brackets can then be compensate...

Page 17: ...tight to the brackets By loosening a hexagon nut the weight of the bearing implement is distributed among the other hexagon nuts and is partially increased Avoid overloading individual hexagon nuts Figure 3 5 Operating state In this state the load cells with the pressure pieces form self centering units The compact installation units allow the top plates and the load bearing implement to be deflec...

Page 18: ...tion units are made up of fine core flexible copper wires The flexible copper wires are tin coated to additionally protect the copper from corrosion Principle of operation The grounding cable represents an electrical by pass via the load cell High weld currents can destroy the load cell installation unit or the electronics The electronics can be affected by voltage sparkovers of static discharges ...

Page 19: ...uide element prevents the top plate from moving in exactly one direction All other directions are free When arranged appropriately three guide elements prevent the load bearing implement from moving horizontally The movement in the measuring direction is not restricted Expansion of the load bearing implement as a result of changes in temperature or load is not prevented Transverse forces acting on...

Page 20: ...Description 3 2 Design and function RN S SA 20 Operating Instructions 09 2016 A5E32605810A 03 ...

Page 21: ...for the fixing screws The total height corresponds to the installation height of the installation unit This is the most stable and secure version Rough installation work can be carried out with the welded construction Use of a SIWAREX WL280 compact installation unit The compact installation units are delivered pre assembled Compact installation units are set to the installation height of the opera...

Page 22: ...ane of 0 2 mm is required for the mounting surfaces More than three support points For more than three support points the load bearing implement is usually statically indeterminate With firm foundations and load bearing implements the load is not evenly distributed to all load cells The same applies to unstable mounts such as a steel construction Two diagonal load cells bear the main load The othe...

Page 23: ...rom becoming damaged This applies both to the measuring direction and the transverse direction If load cells are used beyond the maximum working load or the maximum transverse load this can cause irreparable faults and even fracturing of the load cell or the installation unit Overload protection in the measuring direction Load cells can be protected against vertical overload by placing a stop scre...

Page 24: ...ive measures are required Pendulum limiters or guide elements are suitable for this for example Pendulum limiters must be constructed or set in such a way that the maximum deflection cannot be exceeded in any direction This is shown in two examples in the following figure Figure 4 2 Pendulum limitation with a maximum deflection of 4 mm as exemplified by two weighing platforms Pendulum limiters are...

Page 25: ...the influence of transverse forces Horizontal movement of the load bearing implement should be prevented A change in the distance between the support points for example as a result of expansion of the load bearing implement due to heat must not lead to mutual tensioning of the guide elements The following figure shows the ideal arrangement of guide elements Figure 4 3 Arrangement of guide elements...

Page 26: ...te Weighing errors With four guide elements there is a risk of the guide elements mutually tensioning which in turn induces weighing errors If you nevertheless want to use four guide elements the guide elements must be installed with a sufficient amount of play Ensure that the guide elements to be used comply with the principles applicable to weighing technology 4 6 Protection against explosion Th...

Page 27: ...r falls can irreparably damage the load cell When mounting the load cell ensure that you do not damage or cut the cables of the load cell Load cells must not be carried by their connecting cables Protect the load cells from shocks and welding currents Replace the load cells with dummies until the installation work on the scale structure is completed NOTICE Damage to load cells through high current...

Page 28: ...les These disturbance variables cause errors in the measuring result and can damage the load cells and installation units if the maximum limits are exceeded The mounting components normally allow so much room for movement that heat expansion will not result in lateral loading 5 2 Installing the compact installation unit 5 2 1 General installation information The installation conditions vary widely...

Page 29: ...g the load bearing implement onto the load cell 6 Checking the installation The actions are described in detail in the following 5 2 2 Preparing the load cell NOTICE Damage to the load cell Observe the operating instructions for the load cell When mounting the load cell ensure that you do not damage or cut the cables of the load cell Load cells must not be carried by their connecting cables A data...

Page 30: ...top plate is set with an excess length The excess length corresponds to the lifting path see Table Stainless steel compact installation units Page 47 Take the excess length into account when using dummies For further information see Dimension drawings of the compact installation units Page 49 Rated load Installation height Functional installation height 60 kg to 280 kg 62 1 mm 60 mm 0 5 t 1 t 88 1...

Page 31: ...structions Page 27 Inserting the pendulum support and pressure piece 1 A pressure piece is present in the load cells RN S SA 60 kg to 13 t It is protected against falling out by adhesive tape Remove the adhesive tape Leave the pressure piece in the load cell 2 Remove the pendulum support from accessory kit 1 3 Grease the surfaces of the pendulum support bearings using a ball bearing lubricant 4 Pl...

Page 32: ...gure 5 4 Inserting the load cell 2 Push the pressure piece against the two pins 3 Secure the load cells with the previously removed clamping washer Figure 5 5 Tightening the load cell 4 Secure the pressure piece with the previously removed clamping washer Make sure before securing that the pressure piece is resting on the top plate As long as you do not loosen the hexagon nuts on the top plate the...

Page 33: ... safety regulations must be observed Depending on the installation conditions the detailed procedure may deviate from the following description Installing the compact installation units NOTICE Destruction of the load cells and the installation unit Check that the load cells and installation unit are installed correctly e g by checking the mounting dimensions and oscillation distances Incorrect ass...

Page 34: ...It is then possible to compensate tolerance errors in the drilling pattern of the connection dimensions to a certain degree Remove the eight washers from accessory kit 2 The fixing holes are covered by these washers Insert the envisaged screws and tighten them loosely 5 Install all of the additional compact installation units as described in 1 4 6 Check whether all bracket plates are resting level...

Page 35: ... to 13 t Thread M8 M10 M10 M12 Strength category 70 70 70 70 Tightening torque 15 2 Nm 30 Nm 30 Nm 52 Nm Note Four or more support points If four or more support points are used it cannot be guaranteed that all compact installation units are loaded equally When tightening unloaded compact installation units the top nuts underneath the top plates are additionally pretensioned by loaded compact inst...

Page 36: ...d bearing implement NOTICE Loosening the hexagon nuts Only loosen the hexagon nuts in turn in very small steps During the process note which hexagon nut is loaded and which is not Note The compact installation units are screwed tight to the brackets By loosening a hexagon nut the weight of the bearing implement is distributed among the other hexagon nuts and is partially increased Avoid overloadin...

Page 37: ...nally opposite load cells could be overloaded by a full scale Compensate the height as follows 1 Determine which load cell has the lowest load Connect load cells in the junction box Disconnect the load cell cables SIG and SIG Connect a supply voltage e g 10 2 V to the load cells via a SIWAREX weighing module Measure the output voltages of the individual load cells between SIG and SIG 2 Perform the...

Page 38: ...by checking the mounting dimensions and oscillation distances Incorrect assembly can lead to destruction of the load cell and the installation unit 1 Check to ensure that the following items are fulfilled after the installation The load bearing implement must be able to oscillate freely The countersunk head screws should be located as close as possible to the center in the bores of the top plate T...

Page 39: ...e elements With one guide element You can flange a guide element on the front or rear of the compact installation unit The rear is recommended since the load cell is then always accessible You can flange the guide element before or after installation of the compact installation unit into the scale You can flange the guide element before or after lowering of the load bearing implement Connection is...

Page 40: ...elivery 1 x turnbuckle set to distance 2 x flanges Accessory kit for RN S SA 60 kg to 280 kg RN S SA 0 5 t 1 t RN S SA 2 t to 5 t 2 x hexagon bolts 2 x hexagon nuts 4 x washers 4 x cylinder head screws Accessory kit for RN S SA 10 t 13 t 2 x hexagon bolts 2 x hexagon nuts 4 x washers 6 x cylinder head screws 5 3 3 Locking the top plate Rotate the top nuts of the countersunk head screws alternately...

Page 41: ... and connect the cylinder head screws 5 Tighten the cylinder head screws Guide element 60 kg to 280 kg 0 5 t 1 t 2 t to 5 t 10 t 13 t Cylinder head screw M6 A2 70 M8 A2 70 M10 A2 70 M10 A2 70 Tightening torque 6 3 Nm 15 2 Nm 30 Nm 30 Nm 6 Tighten the fixing screws of the turnbuckle Guide element 60 kg to 280 kg 0 5 t 1 t 2 t to 5 t 10 t 13 t Cylinder head screw M8 A2 70 M10 A2 70 M12 A2 70 M16 A2 ...

Page 42: ... other hexagon nuts and is partially increased Avoid overloading individual hexagon nuts 2 Rotate the top nuts downward The top plate is lying on the load cell via the pendulum supports The respective load cell is loaded 3 Tighten the nuts against the bottom nuts In this way you prevent the nuts from rotating upwards due to vibrations 5 3 6 Fixing of second guide element Fix the second guide eleme...

Page 43: ... assembly 1 Disconnect all the supply voltages and auxiliary voltages 2 Secure the load carrier against falling 3 Use appropriate hoisting gear and tools 4 Take the load off the load cell 5 Carefully remove the load cell without using force Do not pull on the cable of the load cell 6 Do not cut the cable if the load cell is to be re used or sent in for repair 7 Do not carry the load cell by the ca...

Page 44: ...Mounting 5 4 Dismantling RN S SA 44 Operating Instructions 09 2016 A5E32605810A 03 ...

Page 45: ...act installation units according to the ambient conditions Select the servicing intervals based on the emergence of dust dirt and moisture Keep the compact installation units free of dirt Check the bearing surfaces of the pendulum supports Clean the bearing surfaces as required Grease the bearing surfaces as needed Guide elements Check the guide elements according to the ambient conditions Select ...

Page 46: ...ockage or to an overflow of the scale Personal injury and material damage may occur Regularly check the existing overload protection elements Select the servicing intervals based on the occurrence of dust dirt and moisture Keep the overload protection elements free of dirt and ice Check the settings for the overload protection elements Re adjust correct the overload protection as needed Grounding ...

Page 47: ...ted transverse force on the top plate with lowered top plate 0 5 kN 0 7 kN 1 5 kN 5 kN Permitted supporting load with fixed top plate 20 kN 30 kN 55 kN 85 kN Permitted lifting force on the top plate 2 4 kN 4 2 kN 9 4 kN 16 kN Permitted transverse force on the top plate with fixed top plate 3 kN 3 kN 9 kN 14 kN Cross section of grounding cable 10 mm2 10 mm2 10 mm2 16 mm2 1 Specification in of appli...

Page 48: ...Technical data 7 2 Stainless steel guide elements RN S SA 48 Operating Instructions 09 2016 A5E32605810A 03 ...

Page 49: ...SA compact installation unit All dimensions are in millimeters Two dimension drawings are specified for each installation unit Installation state The compact installation unit is delivered in this condition The top plate is set 2 or 3 mm higher than in the operating state The load cell can be installed in this state and is not loaded Operating state In this state a built in load cell is loaded The...

Page 50: ...N S SA 60 kg to 13 t installation state Figure 8 1 Dimension drawing of RN S SA compact installation unit 60 kg to 13 t in installation state 60 kg to 280 kg 0 5 t 1 t 2 t to 5 t 10 t 13 t A 136 165 185 200 B 60 75 75 90 C 166 200 220 240 D 90 110 110 130 E 12 15 20 20 F 62 88 98 130 2 G 14 5 18 23 24 H 9 11 11 13 5 J 13 5 17 5 17 5 20 ...

Page 51: ...1 RN S SA 60 kg to 13 t operating state Figure 8 2 Dimension drawing of RN S SA compact installation unit 60 kg to 13 t in operating state 60 kg to 280 kg 0 5 t 1 t 2 t to 5 t 10 t 13 t A 136 165 185 200 B 60 75 75 90 C 166 200 220 240 D 90 110 110 130 E 12 15 20 20 F 60 85 95 127 2 G 14 5 18 23 24 H 9 11 11 13 5 J 13 5 17 5 17 5 20 ...

Page 52: ... Operating Instructions 09 2016 A5E32605810A 03 8 2 Dimension drawing of guide elements Figure 8 3 Dimension drawing of guide element RN S SA 60 kg to 13 t 60 kg to 280 kg 0 5 t 1 t 2 t to 5 t 10 t 13 t A 166 200 220 240 B 60 85 95 127 2 C 10 12 20 20 D 30 5 35 45 5 54 4 ...

Page 53: ... kg to 280 kg 7MH5713 3JA00 RN S SA 0 5 t 1 t 7MH5713 4AA00 RN S SA 2 t to 5 t 7MH5713 4PA00 RN S SA 10 t 13 t 7MH5713 5DA00 The load cells are not included in the compact installation units Guide element Table 9 2 Ordering data of guide elements Compact installation unit Designation Rated load Order No stainless steel RN S SA 60 kg to 280 kg 7MH5713 3JE00 RN S SA 0 5 t 1 t 7MH5713 4AE00 RN S SA 2...

Page 54: ...on the brackets with four or more load cells Table 9 3 Ordering data of compensation plates Set of compensation plates Designation Rated load Description Order No stain less steel RN S SA 60 kg to 280 kg 16 x 0 5 mm 7MH5713 3JG00 RN S SA 0 5 t 1 t 24 x 0 5 mm 7MH5713 4AG00 RN S SA 2 t to 5 t 4 x 0 5 mm 16 x 1 mm 7MH5713 4PG00 RN S SA 10 t 13 t 4 x 0 5 mm 20 x 1 mm 7MH5713 5DG00 ...

Page 55: ...vice Support http www siemens com automation service support Personal contact If you have additional questions about the device please contact your Siemens personal contact at Partner http www automation siemens com partner In order to find the contact for your product select under All Products and Branches the path Automation Technology Sensor Systems Documentation You can find documentation on v...

Page 56: ...Appendix A 1 Technical support RN S SA 56 Operating Instructions 09 2016 A5E32605810A 03 ...

Page 57: ...Preparing 40 Principle of operation 19 Servicing and maintenance 45 Structure 19 H Hotline 55 I Installation Installing the compact installation unit 33 Installing the load cell 31 Lowering the top plate 36 41 Overview 29 Preparing the compact installation unit 30 Preparing the guide element 40 Preparing the load cell 29 Internet 55 L Lifting protection 21 Application 12 Load cell Installing 31 Pr...

Page 58: ...7 S Scope of delivery Compact installation unit 6 Guide element 6 with figures 30 40 Service 55 Structure Grounding cable 18 18 Guide element 19 Support 55 Support point 22 T Technical specifications Stainless steel compact installation unit 47 Stainless steel guide elements 47 ...

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