Chapter 8: Calibration
Shift Adjust
(2/01) 8-1
8
Calibration
Shift Adjust
WARNING
PERMIT ONLY QUALIFIED PERSONNEL TO SERVICE THIS
EQUIPMENT. EXERCISE CARE WHEN MAKING CHECKS, TESTS,
AND ADJUSTMENTS THAT MUST BE MADE WITH POWER ON.
FAILING TO OBSERVE THESE PRECAUTIONS CAN RESULT IN
BODILY HARM.
When you shift adjust a scale, you are adjusting the output voltage (signal) of each
load cell so that all load cells in the system produce a consistent signal. A correctly
adjusted scale will give the same weight reading no matter where on the platform you
place a test weight. Each VERTEX floor scale is shift adjusted at the factory. For a new
installation, the only adjustment that should be needed is minor load cell trimming.
After the scale has been installed and shimmed, check all mechanical parts to make
sure that they work properly. Then check the scale’s repeatability by placing a test
weight on the same location on the platform several times to make sure that you get the
same weight reading each time. After checking for repeatability, adjust the load cell
trimming potentiometers as needed.
Analog Junction Box
Shift Adjustment
Use the following procedure to trim the load cells:
1.
Remove the access plate from the scale platform, and open the junction box.
2.
Figure 8-1 shows two sets of test weight locations. If you use a test weight equal to
1/4 of the rated scale capacity, place the test weight at each corner of the scale
platform. If you use a test weight equal to 1/2 of the rated scale capacity, place the
test weight at the center of each quadrant of the scale platform.
Place a test weight at location A and record the weight reading. Then move the test
weight to location B and record the weight reading. Continue until you have taken a
weight reading at each of the four locations.
To Next Page
Loading...
General