OPERATION AND INSTALLATION
RCI-4100 SYSTEM
MAN-1111 Rev H
©Copyright 2015 LSI-Robway Pty Ltd
Page 16
2.3.3.
Single Sheave Dynamometer with Load Pin
(Wired to Control Unit though an EEx ib Load Cell Isolating Barrier)
A load pin can be fitted in a single-sheave mounted close to the boom tip for hoist-rope-tension
type installations. The load pin will output an electrical signal proportional to the line-pull or tension
on the hoist rope and representing the forces exerted on the load pin’s sheave by the hoist rope.
Each hoist rope will have a single-sheave dynamometer.
Route the cable carefully around the boom head, along the boom, and into the RCI Control Unit.
Fix the cable using adequate straps and fixings ensuring that the cable is not pinched or stretched
as the boom moves through its full luffing arc (see also “Cabling (Sensors)” Section 2.3.6).
Ensure the resultant hoist rope down force on to the load-pin does not exceed the Load-pin
capacity. The down force is relative to the hoist rope deflected angle over the load sensing
sheave. Calculation is: -
Down Force = sin (deflected angle) x line-pull (tonnes).
Example: - 1.5mt Load-pin installation.
Rope deflected angle (wrap angle) is 2.7 degrees
Max line-pull is 25 test allowance = 25.0 + 15% = 32.5t
Calculation: - Sin (2.7 deg) x 32.5t = 1.53t down force
This is an intrinsically safe circuit so “blue sheathed” cable supplied by LSI-Robway is required.
CAUTION:
HIGH TENSILE BOOMS REQUIRE PROPER WELDING PROCEDURE
SPECIFICATIONS. OBTAIN SPECIALIST ASSISTANCE WHEREVER
APPLICABLE.
Reference the applicable drawing(s) in APPENDIX N, System Drawings
Figure 3 - Typical Load Pin and installation of load pins in single sheaves
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