A&D Weighing AD-4407 - Manual (Page 7)

AD-4407 Weighing Indicator Page 5
3. 3. 3. 3. Installation and Precautions Installation and Precautions Installation and Precautions Installation and Precautions
3.1.1. Installation and Precautions
The weighing indicator is a precision electronic instrument. Handle it carefully.
The operating temperature is -10°C to +40°C (14°F to 104°F).
Do not install the scale in direct sunlight.
Mis-operation or other problems may be caused by an unstable power source including
momentary power failure or instantaneous noise. Use a stable power source.
Do not connect the power cord before the installation has been completed.
Verify that the local voltage and receptacle type are correct for your scale.
Use shielded cable for all connections. Connect the cable shields to the shield
terminal or case as an earth terminal.
Earth ground the indicator. Do not join the earth ground line with other electrical
power equipment. (Example: There is an earth ground terminal at the power cord receptacle.)
Do not install the indicator in a place where it is apt to be charged with static
electricity, or where the relative humidity is lower than 45%RH. Plastic and insulating
materials are apt to be charged with static electricity.
3.1.2. The Load Cell Connections
Connect the load cell cable to the terminal as shown below.
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. Space the load cell cable
away from any noise source.
It is possible to connect eight 350ohm load cells.
The load cell drive is 5VDC 5% between EXC+ and EXC-, the maximum current
120mA.
3. Installation and Precaution
Loadcell
Cable
Positive Signal In
Negative Signal In
Negative Sense
Negative Excitation
Positive Excitation
Positive Sense
Shield
Standard connection
1
2
3
4
5
6
7
Cable
Shield
Available connection for
a cable shorter than 5m.
1
2
3
4
5
6
7