Dynaswitch & Cranegard User`s Manual
Contents
1. Ensure there is power to the circuits involved Reset the microswitches Check the microswitch and the circuit for continuity Check the functions of the machinery setup for items that would cause improper actuation Most problems will be found in one of these areas Excessive wear in attachment fittings is caused by excessive loading improper installation or abnormal machinery travel Replace damaged fittings and correct the machinery installation or loading problem Section 5 Cranegard Load Limit Switch 5 1 Introduction 5 2 General Description 5 3 Safety Factor 5 4 Micro Switches 5 5 Key Specifications The Dillon Cranegard Load Limit Switch is used to protect cranes and hoists against overloading where it is impossible or inconvenient to use a Dillon Dynaswitch This unit can be applied to wire rope without cutting or removing the dead end from its existing mount It may also be used on machinery such as elevators to provide a switch action at a given load The Cranegard is intended for applications with gradually applied tensions and not dynamic or impact loads The Dillon Cranegard Load Limit Switch is designed to clamp directly onto typical hoist or crane rope It consists of two side plates Two steel sheaves which are eguipped with precision bearings a rope clamp and center support which in turn is attached to a flexure Arm s on the flexure can actuate as many as four microswitches at preset load po2. Wiring the Compression Model Dynaswitch 2 6 B Wiring the Tension Model Dynaswitch You can put together a test assembly consisting of an indicator light or horn a power source and two leads with alligator clips to simulate the machinery s control circuit Any time the Dynaswitch is removed from the machin ery and reinstalled you must check the switch operation Failure to do so could result in inaccurate actuation as the calibration could change 12 To pick the proper sized Dynaswitch for the job do the following 1 Determine the mounting position 2 Calculate the load to be applied to the Dynaswitch 3 Refer to Table 1 1 to select a Dynaswitch with the proper capacity and minimum maximum set point range Loads applied to compression Dynaswitches cause the force beam legs to deflect and come closer together Loads applied to tension units cause the force beam legs to deflect outward and spread apart Microswitches are S P D T and have three contact terminals One is normally open one normally closed and one is common Therefore they can be wired to make or break a circuit at specific set point s To make a circuit 1 on increasing compression load use common and normally open contacts 2 on decreasing compression load use common and normally closed contacts To break a circuit 1 on increasing compression load use common and normally closed contacts 2 on decreasing compression load use commo
3. enough not to work as designed E Force Beams Cleaning corrosion and painting are the only authorized services If the force beam has suffered damage or permanent deformation replace the entire Dynaswitch 15 4 3 Authorized Replacement 4 4 Troubleshooting 16 Attachment Fittings The customer is authorized to replace only shackle and pin attachment fittings at their facility Customers desiring replacement of any other attachment fitting must return the Dynaswitch to Dillon or a factory authorized distributor for attachment fitting replacement The reason for this is that all attachment fittings other than shackles and pins are pinned to the force beam after assembly Microswitches Addition and replacement of microswitches as well as conversion from one type to another is authorized as long as the user orders the proper Dillon microswitches Microswitch mounting brack ets and adjustment screw mounting brackets are available for all authorized configurations Switch calibration is reguired after such service Other Parts The replacement of parts other than shackle and pin attachment fittings authorized microswitches and microswitch mount ing hardware is not authorized Attempting to make unauthorized repairs on the Dynaswitch automatically voids the Dillon warranty Problems are generally limited to the Dynaswitch actuating too soon too late or not at all Recommended troubleshooting procedure A B C D
4. crane and number of parts of line to the hook refer to 2 3 C Choose the number of switches and set point D Refer to table 5 1 for proper selection 6 3 Cranegard Field Installation Procedures 6 4 Electrical Wiring Any time the Dynaswitch is removed from the machin ery and reinstalled you must check the switch operation Failure to do so could result in inaccurate actuation as the calibration could change w Mount Cranegard at desired location on wire rope as described in Paragraph 6 1 Remove the protective cover to expose adjustment screws Refer to Paragraph 2 6 Notes 1 and 2 for information on construction of a test assembly for switch adjustment Figure the desired set point for each microswitch In setting two three or four switches set the highest set point first then work down accord ing to weight Any other sequence will cause a shutdown during the adjusting process Turn the adjustment screw s counterclockwise away from the microswitch plunger s as far as possible Apply the trigger load insuring that the cutoff load is approached from the desired direction For increasing loads such as overload detection gradually apply the load For decreasing loads such as slack line detection apply at least 5 more load of Cranegard capacity than is desired for switch trigger then gradually reduce the load until trigger load is reached Slowly turn the adjustment screw until it contacts the mic
5. DILLON Dynaswitch amp Cranegard User s Manual Table of Contents Section 1 Dynaswitch General Information eeeee aaa aaa aaa 5 TEA lntroduictiGn ieu Z EO EE Maa eae tee eat eed 5 1 2 General DescriptiOn lt r ancl ate eae eed et ED Fy 5 VEO DANY an che seh ca vaca NG NEU NN YA NG ON YNG 5 1 4 Compression Models ueee eee 5 TS TENSION MOE Sis an A es A eed OE YND a 5 1 6 Key Specifications and Options eeee aaa 6 d f MICrO WIIChES 4a aa A A Aa A Pe ATON SUL opal 7 1 8 Attachment Fittings ea 8 Secto 2 Installation u _ O AGE a FFF FN FFA FNAN 9 2 1 Mounting Positions Tension Models eeeea FF Y YL LL RYAN 9 2 2 Mounting Positions Compression Models 21 21 1 1 9 2 3 Dynaswitches 8 Reeving Setups uuueeee aaa 10 2 4 Other Installation Possibilities eaa FY LL LII Yon 11 2 5 DynaswitchS lectiOl i neii Yr iW EA EL 12 2 6 Dynaswitch Field Installation Procedures eeeeeeeeiiiieeeeH 12 2 6 A Wiring the Compression Model Dynaswitch 12 2 6 B Wiring the Tension Model Dynaswitch 111 12 2 6 C Setting the Set Point i aaa i iy eee eet daha idee dee 13 Section Operation i ies oi a AAAA NAIN OE 15 3 1 Safety Shutdown Function eee eee aaa 15 3 2 D
6. amage to measuring capability When loads are applied to compression models the force beam legs tend to come closer together Paragraph 2 6 A explains how to hook up safety overload circuits and auxiliary circuits of compression models mi croswitches Compression models contain threaded holes on the bottom leg for mounting to machinery and a spherical bearing on the top leg to concentrate the applied load at one point The stops for measuring capa bility protection are adjustable bolts in all capacities except 25K and 50K where this stop is integral with the force beam When loads are applied to tension models the force beam legs tend to spread apart Paragraph 2 6 B explains how to hook up safety overload circuits and auxiliary circuits to tension models microswitches Tension model attachment fittings include spherical rod end connectors shackles lifting eyes non swivel hooks and threadstuds Attachment fittings are mounted on opposite legs and are in line axially so the applied load will not cause rotation of the beam The stops for measuring capability protection are adjustable bolts in all capacities 1 6 Key Specifications and Options Rated Capacity pounds Minimum Set point Repeatability pounds A Jog Cap beam deflection in inches Option B Option D Avail Avail Option E Option F Option H Option A Option J Option B Option C Option D Option K Optioa F Option G Option H Optio
7. ecreasing Load Operation uee eee aaa 15 3 3 Automation Operation ourien aaa aaa 15 Section 4 Maintenance eee aaa 15 4 1 General Instructions eee 15 4 2 Service IRStTUCUO S wz AO A AAA LA AE AE 15 4 3 Authorized Replacement ea 16 4 4 Troubleshooting eeeeeee eee aaa aaa 16 Section 5 Cranegard Load Limit Switch euuee ooo aaa YY FFI nA AN 17 5 1 IntroductlOn seat a W oaia S PE A ng dO Pa A 17 5 2 General Description s a aa aaa Raan laaan iana Liana 17 D 3 Safety Factor raiar ae nd dd Ea AGA 17 5 4 MicrOswltChi amp ers A RE EA AA po A abe 17 5 5 Key SpECIfICAONSN at NY AAA APA DY ydy WU 17 Section 6 Installation eee aaa AAA 18 6 1 Mounting Positions uueee eee aaa aaa 18 6 2 5electiOD uii eid aa a AA A intel O e AT N 18 6 3 Cranegard Field Installation Procedures uaaaiiauu111 19 6 4 Electrical Wiring cieciu a A i non 19 Section 7 Maintenance eee aaa aaa 20 7 1 General Ini struction aa did a za Ly aa 20 7 2 Mechanical Inspection eee aaa 20 7 3 Electrical Inspection eee AA 20 1 4 Switch Settli d nu i AA ei A NE et ee eg Do 20 7 5 Authorized Parts Replacement u ea 20 1 6 Troubleshooting err 20 Pages are numbered consecutively beginning with the cover page Section 1 Dynaswitch G
8. eneral Information 1 1 Introduction 1 2 General Description 1 3 Safety 1 4 Compression Models 1 5 Tension Models The primary purpose of Model DS Dynaswitches is to protect cranes hoists and other lifting machinery against weight or force overload dam ages They can also be used to perform control functions proportional to weight such as shutting down a pump when a tank is filled As many as four standard microswitches can be installed on the Dillon Dynaswitch to perform multiple automated functions The Dynaswitch is intended for applications with gradually applied loads and should not be installed where it may encounter severe dynamic or impact loads Dillon Dynaswitches are designed to work with either a tension or com pression load All Dynaswitches consist of a U shaped force beam a microswitch or microswitches and attachment fittings for applying load at mounting points The force beam bends as force is applied and causes the microswitches to open or close electrical circuits lllustrations on pages 7 and 8 show various microswitches and attachment fittings Dynaswitch capacity should be selected based on maxiumum forces it may encounter including load increasing factors such as acceleration of mass and static arrangement of cables All Dynaswitch force beams and attachment fittings have a safety factor of 5 1 In addition all models have an overload stop set slightly in excess of rated capacity to prevent d
9. hutdown circuit This can result in injury to workers and damage to eguipment Ensure that the Dynaswitch triggers both the increasing and decreasing load function as planned Stop the machinery and adjust the switch or setup if a problem exists Ensure the automated machinery setup is working properly If it is not stop the machinery and adjust either the Dynaswitch or the other components of the setup until it does work properly Section 4 Maintenance 4 1 General Instructions 4 2 Service Instructions Service the Dynaswitch at least once every six months more often if it is exposed to extreme climate or working conditions according to paragraph 4 2 below In addition check the accuracy of the microswitch at least once every six months more often if it is part of a setup which receives freguent use and reset the microswitch as reguired Switch setting procedures are outlined in paragraph 2 6 A Attachment Fittings Check for unusual wear deformation looseness and corrosion Replace if damaged or loose Clean off corrosion oil compression steel ball fitting as reguired B Micro Switches Replace if wires are frayed or if the connection plunger or housing is damaged in any way C Overload Stop Make sure no foreign material is present in overload stop gap since this could cause errors D Adjustment screws overload devices switch and screw mounting brackets Replace the component if it is damaged or deformed
10. ints Adjust ment screws for the switches are located under a sealed cover The Dillon Cranegard Load Limit Switch flexure beam has a safety factor of 2 1 Ultimate safety factor is a function of wire rope condition In the interest of safety damaged or worn wire rope should be replaced The microswitch is type BZG 1 2RN weatherproof Dillon P N 17981 0048 paragraph 1 7 As many as four switches can be installed on one Cranegard unit Table 5 1 below indicates capacities and other specifications Table 5 1 Part Capacity Min Set Repeatability an Diameter Number Pounds Point Lb Pounds 17 Section 6 Installation 6 1 Mounting Positions 6 2 Selection 18 The best mounting position for the Cranegard Load Limit Switch is adja cent to the wire rope dead end point It also could be installed adjacent to the equalizer sheave where wire rope movement is small a few inches The amount of wire rope movement around the egualizer sheave should be measured by marking the wire rope noting the amount of movement and allowing enough clearance for such movement when mounting the Cranegard unit rip ii ir aw zw Figure 6 A To pick the proper size Cranegard Load Limit Switch for the job do the following A Measure the diameter of the rope on which the Cranegard Load Limit Switch is to be installed B Calculate the maximum load to be applied to the Cranegard Load Limit Switch using capacity of the hoist or
11. load rests on the upper leg as well as on the ball the microswitches will not actuate at the proper load setting Do not restrict free motion of the upper leg since this too could cause the Dynaswitch to activate improperly 2 3 Below are some examples of hoist and reeving setups which use the Dynaswitches amp Reeving Setups Dynaswitch for control and or safety purposes Figure 2 A 2 ropes 2 part single reeving With two parts of line to the hook the Dynaswitch should be installed in series between wire rope and its dead end point Microswitch is set for 72 maximum capacity of the hoist Figure 2 B As shown at right Dynaswitch is installed in series with rope to the dead end The microswitch is set for capacity of the crane because there are four parts of line to the hook Figure 2 D Frictional reactions within the sheaves may prevent all parts The Dynaswitch may also be placed of the lines from having identi between hoist and trolley with cal tension While generally microswitch set for maximum suitable for overload protection capacity of the hoist and trolley it may give unsatisfactory Figure 2 C results for weighing or batch 4 ropes 4 part single control reeving 10 PA Figure 2 E and 2 F show other uses for the Dynaswitch when either tension or compressions loads are present Other Installation Possibilities Knife edge and pivot nO S IJ s Hopper gate Batchi
12. n S e a CYFR FR ER o jamie Optone C aa Al oo i as Avail Avail ee ee Comme e Ava Awe Ael He ARES W NRM Gat Table 1 1 below contains key specifications and options available Table 1 1 Basic Beam DSW 7 Part Number 1000 2000 5000 10000 25000 50000 GM EG a a Avail Avail Avail Avail Avail Avail Avail 001 differential travel switch small size P N 26419 0026 Type 11SM401 T Maximum 4 per unit 004 differential travel switch weatherproof small size 26420 0015 Type 1SE1 Maximum 4 per unit 002 differential travel switch weatherproof P N 17891 0048 Type BZG1 2RN Maximum 4 per unit Explosion proof switch 26424 0029 Type EXA 0 Maximum 2 per unit Spherical rod end connector one Compression loading spherical ball fitting assembly one Lifting eye one Adapter shackle amp pin one set Non swivel hook one Stud for tension loading one 1 7 Microswitches Below are the four microswitches available and their specifications Option A 0 001 differential travel switch Small size Dillon PN 26419 0026 Cat 11SM401 T S P D T 5 amps resistive at 28VDC or 250VAC Option B 0 002 differential travel switch Weatherproof Dillon PN 17891 0048 Cat BZG1 2RN S P D T 15 amps resistive at 125 250 or 480VAC amp at 125VDC 0 004 differential travel switch Small size Weatherp
13. n and normally open contacts To make a circuit 1 on increasing tension load use common and normally closed con tacts 2 on decreasing tension load use common and normally open con tacts To break a circuit 1 on increasing tension load use common and normally open contacts 2 on decreasing tension load use common and normally closed contacts 2 6 C Setting the Set Points 1 Figure the desired set point in pounds for each microswitch In setting two three or four switches set the highest set point first then work down according to weight Any other seguence will cause a shutdown during the adjusting process 2 Turn the adjustment screw In compression models back the adjustment screw as far as it will go away from the switch plunger In tension models turn the adjust ment screw as far as it will go into the switch plunger without damaging the switch 3 Apply a load on the unit equal to the desired setting You must apply an accurately measured load because the set point accuracy will be no better than the known accuracy of the measured load 4 Slowly turn the adjustment screw In compression turn the screw until it is just low enough to actuate the switch Then tighten the jam nut to hold the adjustment In tension turn the screw until it is just high enough to actuate the switch plunger Then tighten the jam nut to hold the adjustment 5 Remove then reapply the load to check the set poi
14. ng operations at preset load points are greatly simplified by means of economical Dillon Dynaswitches Figure 2 E shows a typical hopper with 3 point suspen sion Dynaswitch under one sus pension point is set for 1 3 maxi mum load It opens hopper gate automatically at this point Contents of tank should preferably be liquid since solid materials tend to pile and cause erroneous results Figure 2 E DUTHA AL Ml Figure 2 F Figure 2 F shows an example of using the Dynaswitch in an automatic control function Sand used in foundry operations is brought up from the floor below by conveyor It falls into the chute and then spills into the hopper The hopper itself is suspended from the Dynaswitch at upper left The Dynaswitch is set to open the conveyor motor circuit at 1000 pounds which represents a full hopper At the same instant a trap in the bottom of the hopper also opens permitting contents to flow out into a mixer below A time delay switch on the hopper trap holds it open until all sand has been discharged at which time the reduced load on the Dynaswitch causes it to again close the conveyor motor circuit and repeat the cycle endlessly The Dynaswitch is also acting as a precision scale since it is set to func tion at a specific load point Any form of batching operation can be easily automated by this simple arrangement 11 2 5 Dynaswitch Selection 2 6 Dynaswitch Field Installation Procedures 2 6 A
15. nt It is properly set if the machinery or the test assembly functions as planned within desired tolerances 6 Repeat steps 1 5 as many times as reguired to obtain correct settings Your Dynaswitch is now ready to use It is recommended that you double check your installation before beginning operation 13 Low Differential Travel Switch For 100 1 000 and 5 000 Ib beams only NC ce UL Rating 5 AMPS 125 or 250VAC NO Single pole Double throw Weatherproof Low Differential Travel Switch For 2 000 10 000 25 000 and 50 000 Ib beams only NC UL Rating L 74 c a 15 AMPS 125 250 or 480 VAC 2 AMPS 600 VAC Single pole No 1 8 HP 125 VAC 1 4 HP 250 VAC Double throw 5 AMPS 125 VDC 25 AMP 250 VDC Explosion Proof Switch For 2 000 10 000 25 000 and 50 000 Ib beams only amp NC UL Rating L 23 20 AMPS 125 250 or 480 VAC NO 10 AMPS 125 VAC L Single pole 1 HP 125 VAC 2 HP 250 VAC Double throw 5 AMPS 125 VDC 25 AMP 250 VDC Weatherproof Low Differential Travel Switch For 100 1 000 and 5 000 Ib beams only 5 AMPS Res 3 AMPS Ind Sea level 4 AMPS Res 2 AMPS Ind 50 000 feet 28 VDC Single pole 5 AMPS Res or Ind 115 VAC 60 Hz Double throw UL CSA Rating 5 AMPS 250 VAC 14 Section 3 Operation 3 1 Safety Shutdown Function 3 2 Decreasing Load Operation 3 3 Automation Operation DO NOT override the safety s
16. on of adjacent wire rope Check for frayed wires damage to the microswitch housing and protective cover Check established operating setting s If necessary the switches should be reset Type BZG1 2RN microswitches are the only authorized parts replace ments for Cranegard Load Limit Switches Attempting to make unautho rized repairs to the Cranegard Load Limit Switch automatically voids the Dillon warranty Follow the procedure for the Dynaswitch in section 4 4 Dillon A division of Weigh Tronix Inc 1000 Armstrong Dr Fairmont MN 56031 USA Telephone 507 238 4461 Facsimile 507 238 8258 e mail dillon weigh tronix com www dillon force com DILLON Force Measurement Products amp Systems
17. roof Dillon PN 26420 0015 Cat 1SE1 S P D T 5 amps resistive at 28VDC 125 or 250VAC Option C 0 060 differential travel switch Explosion proof Dillon PN 26424 0029 Cat EXA Q S P D T 20 amps resistive at 125 250 or 480VAC amp at 125VDC 1 8 Attachment fittings for tension and compression models are shown below lllustrations are not to scale Attachment Fittings Option E Compression loading spherical ball fitting assembly Option D Spherical rod end connector Option F Lifting eye Option G Adapter shackle and pin one set Option H Option S Nonswivel hook Threaded stud Section 2 Installation 2 1 Mounting Positions Tension Models 2 2 Mounting Positions Compression Models Some compression models have flat top balls rest the applied load on the flat surface of the flat top ball The best mounting position for a tension model is on the dead end of the line or on a crane anchor point This mounting minimizes the effects of the machinery s motion on the Dynaswitch It keeps the switch in one relative position which reduces the possibility of wire tangling and connector damage Position the Dynaswitch so that all of the supported load is transmitted through the compression ball fitting Bolt the bottom leg to the loading machinery or the facility foundation Make sure the load contacts the Dynaswitch only at the top of the steel ball and nowhere else If the
18. roswitch plunger and the switch actuates Then tighten the jam nut to hold the adjustment Remove then reapply the load to check the set point It is properly set if the machinery or the test assembly functions as planned within desired tolerances Repeat steps D through H as many times as required to obtain correct settings Figure 6 B Micro switch es are S P D T and have three contacts One is normally open one normally closed and one is common Therefore they can make or break a circuit start or stop an operation at a specific set point s To BREAK acircuit at a set point as load increases select normally closed and common switch terminals To MAKE a circuit as load increases wire to normally open and common terminals To BREAK acircuit at a set point as load decreases wire to common and normally open terminals To MAKE a circuit as load decreases wire to common and normally closed terminals 19 Section 7 Maintenance 7 1 General Instruction 7 2 Mechanical Inspection 7 3 Electrical Inspection 7 4 Switch Setting 7 5 Authorized Parts Replacement 7 6 Troubleshooting Weigh Bar is a registered trademark of Weigh Tronix Inc 12 12 00 DS amp CG_U P65 PN 16947 0010G Printed in USA Depending on environmental and working conditions Cranegard Load Limit Switches should be inspected periodically at least every six months Cranegard Load Limit Switches should be free from any contact fricti
Download Pdf Manuals
Related Search