© Adam Equipment Company 2011 Page
8
REMOTE SCALE CONNECTION
The cable for the load cell goes to a 9 pin D-subminiature plug connector with
the following connections:
Pin numbers Connection
Pins 1,2 - Excitation (0 V)
Pins 4,5 + Excitation (+5 V)
Pin 7 + Signal
Pin 8 - Signal
(The sense wires connections of a six wire load cell are not used and should
be connected to the respective Excitation pins).
REMOTE SCALE SET UP
The remote scale should set for a realistic resolution with respect to the input
provided by the load cell/s. See Section 12 for details of configuring the
remote scale.
If a single 2 mV / V load cell is fitted and more than 60% of the load cell is
used for full capacity then the high output of >6 mV span makes it possible to
set a high resolution.
If this criterion is met then the remote scale can be set to a high resolution
with a maximum of 1:30,000, i.e. 300 kg x 0.01 kg.
Where more than one load cell is fitted or the total load cell capacity is not
utilised then a reduced resolution should be selected in the remote scale
technical set up. For example, if a system uses four 2 mV / V 1000 kg load
cells for a scale of 1000 kg capacity then the span output at full scale will be
only 2.5 mV.
In this situation the resolution should be reduced to give a good number of
ADC counts per displayed division. ie. Set to 1:5000 or 1000 kg x 0.2 kg.
Setting a high resolution without providing a good input to the remote scale
ADC will not give better accuracy and may make the scale difficult to meet
performance specification.
For best performance ensure a minimum of 0.1 µV / d.
