Rice Lake JB1010 Signal/Excitation Trim - Manual (Page 8)

5
5.3 Trimming Both Individual Cells and Sections (Full Feature)
The following is the trimming procedure for a new installation with 1K double
isolation full loadcell signal and section execitation trim. All other types of calibra-
tion should be similar with only dipswitch changes for the required confi guration.
1. Connect all loadcells to the J-Box.
• Set dip switches SWB position 1, 3, 4, 5, 6, 7 ON, and 2 and 8 OFF.
• Set dip switches SWA all in the ON position.
2. Perform a reference point calibration. The scale should be stable and
return to zero after calibration. If it does not do this, correct the problem
in the scale before attempting to do any trimming of the scale.
3. Enable the signal trim for all loadcells.
• Set dip switches SWB all in the ON position.
• Set dip switches SWA position 1, 3, 5, 7 ON, and 2, 4, 6, 8 OFF.
4. Using Pot A and Pot B for their respective cells, trim each loadcell by
placing a test weight on the loadcell that is being trimmed in each section
and trim it's respective pot so that it matches other weight reading of the
other loadcell in that section pair. Do this to each section. The section weights do not have to match the
actual test weight, just the other loadcell in that pair.
5. Enable execitation trim for all loadcells
• Set dip switches SWB position 1 and 7 OFF.
6. Using the pot for sect +exe and sect -exe, trim each section with a test weight so that it matches the
other sections by using a test weight. The value on your indicator may not match your test weight actual
weight.
7. Perform a fi nal calibration. The scale should return back to zero and repeat. Make any small adjustments
as required.
Notes:
Loadcell A pot is a signal trim pot that can be set up as follows:
• with A2 and A4 OFF, do just the odd loadcell signal trim
• with A2, A4, A6, A8, and B2 ON, the pot will do section signal trim.
Loadcell B pot is a signal trim pot that can be set up as follows:
• with A6 and A8 OFF, do just the even loadcell signal trim.
• with A2, A4, A6, A8, and B8 ON, the pot will do section signal trim.
Section +exe pot adjust:
• with B7 OFF, pot will do section +exe trim
Section -exe pot adjust:
• with B1 OFF, pot will do section -exe trim
SECT
+EXC
SWA
FULL FEATURE
INDIVIDUAL TRIM: SIGNAL
SECTION TRIM: EXCITATION
1K ISOLATION RESISTORS
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8
SWB
CELL
"A"
CELL/SECT
"B"
O
F
F
O
F
F
SECT
-EXC
ROCKER
DOWN