Down Shop Lead. It is used for power feeding in equipment.
Hand Operated Travelling crane
Electric Overhead Travelling Crane
Refer IS:3177
CT stands for Cross Travel and LT stands for Long Travel
Class – I Now M1, M2 & M3 Class – II Now M4 & M5 Class – III Now M6 Class – IV Now M7 & M8 as per IS:3177 2020.
Its depends upon the class of duty and uses of the crane but generally we can consider life of cranes 25 five years if crane is class – II
class of EOT Cranes defines the usage of cranes, as seen above table different classes has different total life in working hours — so more the class the more is the life of the crane
Please refer to the above picture for the class of cranes — it’s basically selected on the basis of the usage of the crane.
Class of duty indicates crane codal life and operation time for example if we consider class II duty crane it means Average Working Hours Per Day is 4-6 Hrs.
Class of duty is decided based on the average working hours in a day (24hrs)- as mentioned in above table for class II duty average working hours is 4-6 hrs.
Uses of slings depend on the object size and shape and also we have to take care of balancing of the lifted object. 2 leg may be used if the object is symmetrical shape, otherwise prefer 4 legged
For 10t crane the sling chosen should be min 20t (2 times the requirement to be lifted) also please refer to the angle chart for the decrease in the capacity of sling based on the angle of lifting
Electric Hoist suspended and run in a single fixed I-Beam section and have only two motion upward downward and left and right in one axis.
Single Girder Crane– It is a type of EOT crane having one Girder and two nos of end-carriage an electric Hoist suspended from the crane girder. It allows three direction motion- upward downward, left to right along with span and backward forward along with length of shed.
Double Girder Crane– It is a type of EOT crane having two nos of Girder supported with two nos of end-carriage.. It allows three direction motion- upward downward, left to right along with span and backward forward along with length of shed. In double girder crane crab or trolley with hoisting and ct mechanism travel over the bridge girder.
They are defined in IS:3177, however as users you should not be worried about the same
Please note that EOT Crane is a fully customized product based on the application, no. of operation, type of loading, atmospheric requirement, utilization, required life hours etc.
Crane have majorly 3 motions & if any motion out of 3 is manual than crane will be Semi EOT Crane. Based on the required pulling effort, any motion can be selected manual subjected to a man pull 250N continuously & 350N for a short period. In general Traverse motions required less pulling effort hence
Cross travel & Long travel motions preferred worldwide for manual operation subjected to a man pull 250N continuously & 350N for a short period.
However for the lower rated load hoisting also can be selected for manual operation.
IS:3177 & IS: 3938 will be applicable for the relevant integral items selection & design.
IS 3177:2020 for recommended formula.
Variable voltage variable frequency Drive —VVFD stands also we say VFD in short form
Find over current in drive display. Reasons– Brake not adjusting properly.
Both are the same.
Check all electrical connections
Please check with E105 for input feeding and then output.
AC & DC both types are available
If drive is used in your crane then check CT parameter for speed if without vfd then kindly check your brake setting and mechanical arrangement.
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