Rice Lake JB4SS TuffSeal Signal Trim Junction Box - Manual (Page 7)

5
4.1 Excitation Board Trimming Procedure (JB4ES and JB4EP)
Use the following steps to properly trim the JB4ES and JB4EP junction box.
1. Determine the number of load cells needed.
2. Make sure jumpers have been removed to enable trimming of the desired
cells corresponding to each load cell in use. See Figure 5 for the location
of jumpers JP1, JP2, JP3, and JP4. Note that jumpers must be removed
to enable trimming on the excitation board.
3. Set all potentiometers fully clockwise to give maximum signal output
from each cell (see location of potentiometers below).
4.0 Trimming Procedure
Trimming is a process of equalizing the output from multiple individual load cells.
If needed, load cell output can be individually trimmed with po ten ti om e ters.
Whenever a substantial amount of trim (more than 5% of normal output), seems
necessary to equalize output check for other possible problems. The best trim is
always the least amount of trim. When all errors except cell mismatch and cable
extensions or reductions have been corrected, continue with the trimming.
Please refer to the appropriate trimming section depending on whether you've got
an excitation board (JB4ES or JB4EP) or a signal trim board (JB4SS or JB4SP).
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Figure 5: Excitation Main Board