A&D Weighing AD-4406 - Manual (Page 8)

Page 6 AD-4406 Weighing Indicator
3.3. The Load Cell Connections
Connect the load cell wires to the connector (receptacle), at the rear panel, using the
accessory load cell plug.
It is possible to connect a 4 wire cable provided that pins 1-2 and pins 3-4 are
shorted, if the distance between the indicator and a load cell is shorter than 5m.
The output voltage of a load cell is a very sensitive signal. Place the load cell cable
away from any noise source.
It is possible to connect four 350 ohm load cells.
The load cell drive is 5VDC 5% between EXC+ and EXC-, the maximum current 60 mA.
3.4. Adjustment of the Load Cell Output
Caution Use a metal film resistor in the range of 50kohm to 500kohm with a good
temperature coefficient, when adding a resistor to adjust a load cell
output. Use the largest resistance value possible in the range in which
zero adjustment is possible. Solder this resistor at a point near the load
cell or the indicator.
In Case of Reducing the Output Voltage
When the zero output is too large, add a resistor
between EXC+ and SIG-.
In Case of Adding an Offset Voltage to the Output
When the zero output is too small, add a resistor
between EXC+ and SIG+.
3. Installation and Precautions