Honeywell AutoSet 1500 User Manual page 39

10. Turn power to AutoSet off, then back on. This must be done to reset the unit after
changing the tonnage switches. (Also resets decimal point if decimal point switch
was changed.)
11. Find the toggle switch marked S3. It is next to the "percent tolerance selector"
just above the strain link connectors. Set the switch to "zero." Look at the tonnage
displays. For one cell calibration, the number on the left display must be between
±50. For two cell calibration, the number on both displays must be between ±50.
If the numbers are not within this range, there is a problem with your calibration
unit. Call Data Instruments for assistance.
12. Set toggle switch S3 to "calfactor."
13. Find the potentiometers for setting gain. They are small blocks labelled R17 and
R25 at the bottom center of the box. A tiny screw protrudes from the upper left
corner of each block.
Figure 3-4. Gain potentiometer for setting calfactors on calibration unit
14. Find the block marked R17 (top block). This controls the left display. Turn the
screw one way or another until the left tonnage display reads 157 ±2. For two cell
calibration, adjust the right display as well. Turn the screw on block R25 (bottom
block) until the right display reads 157 ±2. To calibrate the press in metric tons,
set the calfactor to read 173 ±2.
15. Set the toggle switch to "operate." The tonnage displays should now show 0 tons.
16. Find the percent tolerance selector near the bottom right of the box (see Figure
2-2). Turn the dial until the pointer is at 0. Press the reset button and hold for at
least two seconds until the displays flash.
Setting the percent tolerance selector to 0 disables AutoSet's automatic setpoint
function. Some numbers will appear in the setpoint displays after the unit is reset.
Ignore these numbers. You only use the tonnage displays on your calibration unit.
17. You are done setting up the AutoSet calibration unit. It will now read the correct
tonnage when you apply a load to the load cells. Go to the next procedure—
"Calibrating your AutoSet 1500."
AutoSet 1500 User Manual 32
Calibration
Ch 3 1088500