Fairbanks Trident Precast Concrete Deck Truck Scale - Manual (Page 26)

Section 4: Installing Accessories
04/11 26 51255 Rev. 2
Note: This truck scale has been designed to provide protection from the effects
of moisture. The load cells have been calibrated with the cable attached, and
therefore the cable should NOT be cut.
The cable is connected directly to the balance box or SSC through a sealed bushing
which MUST be tightened properly to keep water/moisture out of the box.
All cabling should have a drip loop at the cell or box entry location to help prevent
water entry.
On all boxes, particularly stainless steel, the black plastic fittings have “O” rings
that can be forced out of position if the bushing itself is not tight.
To prevent this, first tighten the inner nut securing the bushing in the hole, then
insert cable and carefully tighten the gland until it is very snug.
Do not over-tighten where bushing turns.
Secure the cover.
Note: Balance boxes must have one (1) ground rod in the pit for proper grounding.
C A UTION
Inadequate grounding will prevent the surge
voltage protection from functioning properly.
1. Instrument cable connection, balance box
The two (2) cables from the two (2) center section boxes will enter the 14478
instrument SVP and terminate there. The cable from the instrument will
connect at 14478 instrument SVP as well. Prepare the cable ends in the
standard manner. Use Appendix II for wiring instructions of all pit balance
boxes. Connect the instrument interface cable to the instrument in the scale
house per the instructions in the appropriate instrument service manual.
2. Adjusting cells/sections
Try to install load cells of matching outputs in sections to reduce side-to-side
errors. When calibrating, place weights directly over the cell or directly on the
section being tested. Adjust the potentiometers for the correct cell or section
to compensate for differences.