The Load Cell Connections; Adjustment Of The Load Cell Output - A&D AD-4406A Instruction Manual

3.3. 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
connected, 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
mA.
Load cell
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
5% between EXC+ and EXC-, the maximum current 60
Cable
Positive Sense
Positive Excitation Input
Negative Excitation Input
Negative Sense
Negative Signal Output
Positive Signal Output
Shield
Load Cell Plug
Standard
connection
Page 6
Cable
Shield
Connection available for
a cable shorter than 5 m.
(Recommended wire cross-
2
sectional area: 0.5 mm
Additional
resistor
Additional
resistor
AD-4406A Weighing Indicator
or greater)