Rice Lake DeckHand/DeckHand Rough-n-Ready System User Manual
Page 13
Service Information
9
Corner Trimming
All DeckHand scales are delivered with the junction box trimmed, but re-trimming to equalize loading is necessary
after replacing a load cell.
To trim the scale, the output from each load cell must be matched by adjusting the signals with potentiometers at
the junction box—a process known as trimming.
The indicator must be connected and approximately calibrated, but it need not indicate the exact weight value. An
exact calibration will be done after trimming.
A test weight is required for corner trimming. The recommended minimum test weight for all DeckHand models is
25% of scale capacity.
1. Remove the junction box cover and identify the correct load cell terminal corresponding to each side of the
scale (labeled CELL 1, and CELL 4).
Figure 6: Cell 1 and Cell 4 Potentiometers
2. With scale level and no weight on the scale, zero the indicator. Then turn potentiometers for cells 1 and 4
fully clockwise to get the maximum signal from each load cell. A clicking sound can be heard when full
signal is reached.
3. With both potentiometers at full signal, place the test weight over left or right side of platform and record
the indicated weight reading. Repeat the process for the other side. The load cell with the lowest reading
will be used as the reference cell and will not be trimmed.
4. Place the test weight over the side reading high and turn that cell’s potentiometer to adjust the cell output
down to the reference cell output.
5. Rezero the indicator and repeat the test until both sides are within ±0.1% of the test weight being used.
Adjustments are somewhat interactive, so adjusting the higher output may affect the reference cell output.
6. Secure extra cable length by wrapping it around the cable storage pegs inside the mast.
7. When corner trimming is complete, pull any excess cable out of the junction box enclosure and tighten the
strain relief hubs snugly with a wrench. To be watertight, the hubs must be tightened to the point where the
rubber sleeving begins to protrude out of the hub (SST models).
8. Replace the J-box cover and column back plate.
9. Recalibrate per Section 2.6.
CELL 1
CELL 4
+EX
–EX
+SI
–SI
100 K
+EX
–EX
+SI
–SI
SHD
SHD
JU1
JU4
100 K