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2.1 Lifting regime and active lifting point
The maximum safe working load will appear at the top left of the screen and is stated in TONNES. This maximum load is for the currently active
lifting duty. Lifting duties are automatically selected using a combination of chassis status, axle lock status, slew angle, chassis angle and switch
inputs. If a particular lift is limited by hydraulic capacity (87% of Main Relief Valve pressure) rather than stability, the maximum safe working load
will be shown in RED. The maximum load is stated as a percentage of the 'tipping load' and in a standard installation will conform to the table
shown below :
Lifting regime
Road
Network Rail
London Underground
Grabbing
Tandem Lifting
If Liftwatch Rail has been configured to use more than one lifting point, the active lifting point can be selected by pressing the LIFT POINT key
from the lift mode menu. Where enabled, pressing the LIFT POINT key will cycle through the following options. See section
on selecting lifting point.
Lifting point
Bucket pin
Auxiliary lifting eye
Grabbing
Liftwatch Rail Operators Manual 560386-000 Issue 1.2 © Prolec Ltd - Feb 2011
Safety factor
71%
All road lifting duties regardless of chassis angles and oscillating axle lock status.
67%
Lift and carry - oscillating axle unlocked
75% or 90%
Static lift - oscillating axle locked. The maximum load will be either 90% of a load
necessary to totally unload a single rail wheel, or 75% of a load necessary to totally
unload both rail wheels - whichever is the lowest.
75%
All LUL lifting duties regardless of chassis angles and oscillating axle lock status.
If the 'GRAB' lifting point is selected
50%
regardless of bogie position, chassis angle or oscillating axle lock status.
If 'Tandem Lifting' mode is selected all duties will revert to this safety factor regardless of
66%
bogie position, chassis angle or oscillating axle lock status.
This is the default lifting point, and will be the only option if no other points have been enabled. Lifting at the bucket
pin requires the use of a Lifting Yoke. If the system has been configured to MONITOR 'quick-hitch' angles, the lifting
point will be the lifting eye on the 'quick-hitch'.
Liftwatch Rail can be configured to use an auxiliary lifting point. This can be anywhere on the machine arm and will
have been set up during installation. If the auxiliary lift point is on a NON-MONITORED 'quick-hitch' or similar, refer
to the manufacturer/convertor instructions regarding positioning of the device during lifting operations.
Liftwatch Rail can be configured for grabbing duties. As the dynamic nature of grab operation cannot be accurately
monitored by the RCI, grabbing duties have their safety margins reduced to 50% of the tipping load.
(see
Notes
1
Notes
below) all duties will revert to this safety factor
5
for details
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