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Idler Alignment
Precise alignment is very important to achieve maximum accuracy of the weighing
system. Improperly aligned idlers could cause unwanted forces to be applied to the
weighbridge, resulting in measurement errors.
Alignment Procedure
1.
Remove the shipping stops to free the weighing mechanism.
•
Keep the screws stored in a convenient place for use during maintenance or at
other times when protection of the cells is necessary
2.
Align and level the weighbridge in the weighing area by raising or lowering the load
cell mount pads in their slots.
•
The weighing area includes the scale and the approach and retreat idler/sliders.
For conventional flat idler roll conveyors, two additional idler rolls should be
included in the alignment procedure.
3.
Adjust idlers (pans on a slider pan conveyor) vertically until they are all within
± 0.8 mm (1/32") of each other.
•
Stretch a line across the top surface of each idler roll (pan) in the scale area at
approximately 25 mm (1") from each end of each idler roll (pan).
•
Use good quality wire [0.5 mm (1/64") diameter] or equivalent nylon line to check
for alignment. The wire or string aligning lines must be able to withstand
sufficient tension to eliminate sag in the line.
4.
Check that the idlers are centered and squared to the conveyor as in step 7 of the
installation procedure.
5.
Tighten the load cell mount pad bolts (34 to 40.8 Nm or 20 to 25 ft lbs).
6.
Carefully lower the conveyor belt onto the scale and fixed idlers (pans).
Run the conveyor for at least fifteen minutes to limber the belt prior to calibration.
7ML19985KM01
WD600 - INSTRUCTION MANUAL
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Page 9
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