12
Connecting the Indicator
Depending on the type of scale ordered, the cable from the load cell to the weight
indicator will most likely need to be connected. Scales that are ordered pre-calibrated
or a typical Weigh Buggy scale will have the connection already made.
Weigh Buggies are constructed with two load cells and require a junction box with
summing board which is included with the scale. The cable between the junction box
and indicator will be prewired prior to shipping from the factory.
The load cell supplied will typically be a Tedea with a 10 foot cable. Do not cut the
cable as the load cell is temperature compensated for an exact length of 10 feet.
Check the manual supplied with your particular indicator to determine the proper load
cell cable input connections. Refer to the following chart for load cell wire codes:
Wire Color Code
Function
Green
+ Excitation (Input)
Black
- Excitation (Input)
Blue
+ Sense
Brown
- Sense
Red
+ Signal (Output)
White
- Signal (Output)
For alternate interchangeable load cell brands check calibration certificate for wiring
specifics. If supplied with a junction box, make certain that all of the cord grip fittings
are tightened with a wrench so that the internal rubber sleeve begins to protrude from
the nut. Pull slightly on the cables to ensure they do not move.
Refer to your particular indicator’s manual for specific calibration procedure. In general
you should place the indicator into “calibration” mode and perform a zero calibration
with no weight on the scale. Then place test weights on the scale equal to 70%-80% of
the scale’s total capacity. If several test weights are being used they should be spaced
evenly around the platform.
Remove all test weights and check the zero reading on the indicator. If necessary,
repeat the above procedure for calibration and then remove the indicator from its
calibration model.
