JB02 Junction box user manual
Zemic Europe B.V.
T: +31 76 50 39480
Leerlooierstraat 8
Nr. 2015.10 JB02 Junction box user manual Rev0
F: +31 76 50 39481
4871 EN Etten-Leur
info@zemic.nl
The Netherlands
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www.zemic.nl
Mounting
The Junction Box can be mounted through the 2 mounting holes (dia. 4mm). The load cells used should
be of the same model, capacity and have the same rated output (mV/V). When installing the junction box,
be sure that the enclosure is connected to the scale framework with a low resistance earth strip.
Electrical Connections
Remove the cover and connect the load cell cables to the circuit board and the circuit board output to the
associated indicator (see fig. 1 ). Each load cell terminal strip has the same sequence for connecting the
respective wires as the indicator terminal strip (each Exc+ is marked with a square (instead of circular)
soldering point). Be sure that all terminal strip connections are tight and that the cables are not damaged.
Tinning the leads is not recommended for vibrant applications.
Fig 1 (load cell and indicator connection)
It is possible for the all JB02 to be used with fewer load cells than for which they are designed.
Calibration
After all wiring is completed and the scale instrument is powered up, turn each of the potentiometers
fully anti-clockwise (maximum 28 turns, click will be heard and/or felt), to obtain the highest possible
output from each load cell. Before proceeding with following adjustments, check the scale for
repeatability and correct any problems.
I Corner adjustment:
Model JB02 has one potentiometer for each load cell. The potentiometer nearest to a
terminal strip adjusts the respective load cell connected to it.
A. Place a test weight over each of the load cells in turn and record their readings and
location. The lowest reading will be used as your target weight.
B. Replace the test weight over each of the load cells in turn and if necessary, adjust the
corresponding potentiometer so that the weight indicated matches the target weight.
C. Place the test weight over the load cell located in the step A. Record this weight as the
new target weight and repeat steps B & C until all cells are matched and all the scale
corners read the same.
II Span adjustment:
For span adjustment please see the manual of the indicator.
+ EXC
exci
- EXC
excitation -
+ SIG
- SIG
signal -
SHIE
shield
