H. installing load cells, Installing load cells, W a r ning – Fairbanks Trident Precast Concrete Deck Truck Scale User Manual
Page 21
Section 3: Scale Installation
04/11
21
51255 Rev. 2
H.
Installing load cells
a. Unpack the load cells and mark each calibration certificate with the load
cell location/position.
* * W A R NING * *
Place hydraulic jacks ONLY at the CORNERS of the modules.
Hydraulic jacks must be placed on opposite sides to lift the module in a level
position. Lifting mid-span or between load cells will cause cracks in the concrete!
b. Starting at one end of the assembled platform, place hydraulic jacks at the
corners so the section can be lifted off the locating tool. Two (2) hydraulic
jacks may be required.
c. Lift the platform so the load cell locating tool can be removed from the
upper and lower bearing cups. Once removed, fill both cups with grease.
d. The bottom of the load cell has two flat sides which must be aligned with
the flats in the lower cup. Carefully lower the scale (hydraulic jacks) while
seating the bottom of the cell into the lower cup. Check the scale’s level
and height, particularly at the approaches. Use the load cell shims
provided to adjust load cell cups for correct height and to ensure that all
cells share an equal amount of the load. Center section cells will have up
to twice the dead load of end section cells.
Caution – Use eye protection!
e. Once satisfied with height and level, tighten the module-to-module bolts.
•
The nuts should be torque to 500 ft. lbs.
f. Load cell cables
•
Introduction: Cable protection on truck scales is extremely important to the
reliability of the scale. It is imperative for all cables to be installed off the
ground, and out of sight. The Trident truck scale has been designed to
accommodate this type of cable protection. Described in this section is the
manufacturer’s recommended installation procedure for installing and
protecting cables on the Trident truck scale.
•
Cable hangers: Behind every SSC or PPS mounting block is a cable hanger.
These cable hangers are used to hang excess load cell and interconnecting cables.