Used to determine crane mechanism classification
State of loading for the crane as a whole.
|State of loading||Nominal load spectrum factor, Km||Descriptive definition|
|L1 Light||0.5||Mechanisms subjected very rarely and normally light loads|
|Mechanisms occasionally subjected to their maximum load, but normally to rather light loads|
|L3 Heavy||0.8||Mechanisms frequently subjected to their maximum load and normally to loads of medium magnitude|
|L4 Very Heavy||1||Mechanisms regularly subjected to their maximum load|
Load spectrum factor can be calculated using the following method.
P1 - load corresponding to operating time t1
Pmax - rated load
t1 , t2 , etc. - operating time for individual loads P1 ,P2 , etc.
T - total operating time