LOAD LIMITER
Contents
1. 0 Y USER MANUAL NCC NA o FUT 66693 56969192 c1ISSSS RELE 2 RELE 1 1 O El 3 PG 0 5 eses E E E z D 2 2 C 9 19 19 10 C4 PROG 221 po 12V COMMUNICATION 001000 Fig 3 1 Load limiter connections Y LOAD LIMITER USER MANUAL UP UP O O 0 81 28 FR LA va gt lt UP O UP RI O R1 Or 22 NY PRESA DOWN O 8 2nd SPEED UP R2 FR 000231 Fig 3 2 Load limiter connection modes 3 3 LOAD LI2. VA001001 USER MANUAL LOAD LIMITER LS2 ITOWA ANY REPRODUCTION EITHER COMPLETE OR IN PART OF THIS MANUAL IS STRICTLY PROHIBITED UNLESS ITOWA HAS GIVEN ITS WRITTEN CONSENT OTHERWISE ITOWA RESERVES THE RIGHT TO INITIATE ALL APPROPRIATE ACTIONS AS ESTABLISHED IN LAW ITOWA RESERVES THE RIGHT TO CHANGE THIS MANUAL WITHOUT PRIOR NOTICE MALIMLS2GB REVO 07 07 15 Approved by the Engineering Manager I Martinez Y TABLE OF CONTENTS 1 INTRODUCTION 2 LS2 LOAD LIMITER OPERATING 2 1 OPERATING IN MODE ONE 2 2 OPERATING IN MODE TWO 3 ASSEMBLY OF LS2 LOAD LIMITER 3 1 CONNECTION OF CHARGING CELL 3 2 POWER SUPPLY 3 3 RELAY 1 CONNECTION 3 4 REALY 2 CONNECTION 4 LS2 LOAD LIMITER SETTING 5 RECYCLING 5 1 PACKAGING LOAD LIMITER USER MANUAL 1 1 2 1 2 1 2 2 3 1 3 4 3 4 3 4 3 4 4 1 5 1 5 1 LOAD LIMITER USER MANUAL 1 INTRODUCTION LS2 is a high precision and safety load limiter preventing accidents and protecting overload breakdowns in overhead cranes and hoists It can also be applied to lifts weight lifters rope tensioning systems and in general to any system or installation where a wire is subjected to traction and want to limit the maximum tension It improves precision and reliability of traditional alternative of motor load limitation 1 1 LOAD LIMITER Y 20 2 152 LOAD LIMITER OPERATING The load limiter by design is
3. intrinsically safe that is in case of failure or disconnection of the strain gauge wire it will stop all working operations The limiter circuit have 2 relays able to cut a current of 16 A at 230Vac These relays can be programmed one of them works like a maximum load relay with 2 tripping out points one instantaneously and the other delayed that allows to adjust the instantaneous trip at 110 of load and the delayed at 100 of load the other relay works like a minimum load relay Another way of programming allows that both relays works as maximum load relays with a programmable timer Hereinafter we will refer to the delayed time operation as mode TWO and the maximum and minimum mode as ONE These two ways of programming are automatically selected depending on the connection or disconnection values put on the relay TWO 2 1 OPERATING IN MODE ONE Operating in mode ONE allows to adjust the relay 1 as maximum load relay with 2 tripping points one instantaneously and other delayed and the relay n 2 as minimum load relay snack cable detection When the load applied to the hoist exceeds of the two programmed values instantaneously delayed the maximum load relay point of disconnection of relay 1 will be deactivated immediately impeding the lifting operation This relay will be automatically reactivated when the load value falls below a previously set value this point will be called connection point of relay 1 If
4. MITER Y a 3 1 CONNECTION OF CHARGING CELL Connect the load limiter to the charging cell or cells as in Fig 3 1 to the connector 5 The colours in the brackets correspond to cells with 4 cables CELL 1 CELL 2 CELL 3 CELL 4 GREEN WHITE Vm WHITE GREEN Vcc BROWN RED YELLOW amp BLACK BLACK MESH In case of most than 1 cell 3 2 POWER SUPPLY Connect the system to the network at 48 115 or 230 through connector C1 3 3 RELAY 1 CONNECTION Connect the relay 1 as in Fig 3 1 to connector C2 N C Contact close C Block N A Contact open 3 4 RELAY 2 CONNECTION Connect the relay 2 as in Fig 3 1 to connector C3 N C Contact close Block N A Contact open 3 4 LOAD LIMITER USER MANUAL 4 LS2 LOAD LIMITER SETTING The load limiter is pre adjusted in the factory with the values supplied by the customer However these values can be changed at any moment in the programming terminal If you don t have this terminal you can make the adjustment through the potentiometer P6 as you can see in Fig 3 1 This setting varies every opening and closing tripping of the 2 relays proportionally To reset the trip point through the potentiometer proceed as follows e Apply to the crane the weigh with which the limiter has to operate e Turn the potentiometer in the opposite direction to clockwise till the relays are disconnected Taking into account the del
5. ay time in case there is some delay timing Turn the potentiometer in the sense of clockwise till the relay R1 is activated e These operations will adjust the trip of relay 1 normal and timed This adjustment procedure is for simple operations of the limiter for complex operations the adjustment has to be done through the programming terminal 4 1 LOAD LIMITER Y 01 5 RECYCLING INFORMATION FOR THE PROPER MANAGEMENT REFUSE ELECTRIC AND ELECTRONIC DEVICES RAEE At the end of the lifetime of the system it should not be mixed with general refuse lt can be delivered without any cost in specific collection centres run by local authorities or dealers providing this service Removed separately electronic waste avoids possible negative consequences to the environment arising from inappropriate disposal and enables treatment and recycling of component materials to obtain significant savings in energy and resources To underline the obligation to collaborate with the selective refuse collection in the product you will find the symbol warning that can not be used the traditional container for the elimination of the system For further information please contact your local authorities 5 1 PACKAGING Materials used for packaging are recyclable For their elimination consider the local standards of treatment of these waste materials
6. elay 1 to operate identically as the mode ONE do while relay 2 can be set as relay 1 but with a different tripping value and timing This operating allows acting on the second lift speed from a certain load permitting only activate the first speed LOAD LIMITER Y 2 3 ASSEMBLY 152 LOAD LIMITER Connection of the LS2 limiter is extremely easy following the detailed instructions on the diagrams Fig 1 8 2 The load limiter can be connected to a hoist in various ways in Fig 2 diagrams A B C D are described the most common uses A With the load limiter in mode ONE and connected as indicated in diagram A the overload limits the lifting B With the load limited programmed in mode ONE and connected as indicated in diagram the overload limits the lifting and the snack cable limits the descends With the load limiter programmed in mode TWO and connected as indicated in diagram limits the lifting in two different values of maximum load one instantaneously and the other with a slightly lower timed value D With the load limiter programmed in mode TWO and connected as indicated in diagram D the second lifting speed is limited with a load value while the first speed is limited with a higher level of load LOAD LIMITER
7. the system has disconnected for exceeding the maximum instantaneous load it connects when the load falls below the disconnection value If it has tripped for the delayed load value it will be connected when it falls below its respective value Normally the value of time delayed disconnection relay 1 will be scheduled lower than programmed in disconnection instant value This operating allows you to prevent oscillations of the load produced by inertia at the time of start lifting a mass whose value 15 close to the maximum load the limiter shoot The design of the timer of relay 1 allows that in case of a load swings above and below of the relay disconnection point it will not turn off until the applied load does not exceed the programmed value in relay 1 a time higher than the in the timer THE VALUE PROGRAMMED IN CONNECTION POINT MUST ALWAYS LOWER THAN THE ONE PROGRAMMED IN THE DISCONNECTION POINT 2 1 LOAD LIMITER USER MANUAL When the load value drops below the programmed value in the relay 2 point of disconnection of relay 2 it will deactivate impeding the dropping operation It will reactivate when the value of the load exceeds the set value at the point of connection of the relay 2 NOTE THE VALUE PROGRAMMED IN CONNECTION POINT MUST ALWAYS BE HIGHER THAN THE ONE PROGRAMMED IN THE DISCONNECTION POINT 2 2 OPERATING IN MODE TWO Operating in mode TWO allows adjusting the r
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