User's Manual

21 LS420 Universal User Manual V2.91 2003-01-21.doc
2.6.2 Radius parameters for a lattice crane.
The radius calculation parameters highlighted in green must be measured
on the crane and set into the advanced menu of the LS420 display unit.
The radius equation is roughly:
slew offset
+ boom length x cos(angle)
+ sheave length x sin(angle)
+ sheave radius
= radius
Jib offset angle.
Jib
length.
Boom length: distance
from boom base pin to
head sheave center.
Crane center of rotation.
Slew offset: distance from boom base
pin to crane center of rotation. If the
boom base pin is behind the crane center
of rotation this value must be negative.
(Your measurement)
Boom
base
pin.
Distance from head
sheave center to jib
mounting point.
(Your measurement)
Head
sheave radius.
(Your measurement)
Sheave head length:
distance from head
sheave center to
boom centerline.
(Your measurement)
Head sheave.
Jib mounting point.