FAD-40 Technical Manual, Rev.2.1.0; February 2022
Page 8 of 55
3.
I
NSTALLATION
PRECAUTION:
Please read this manual carefully before you install the instrument. If you apply all
recommendations in this chapter you will increase the reliability and long term performance of your system.
3.1. Recommendations
3.1.1. Control Cabinet Design
Warning:
Please follow the following warnings for designing the control cabinet which will increase the
reliability of your system.
The control cabinet should be designed therefor the A/D converters can operate safely. The panel should be
placed in a clean area, without getting direct sun light if possible, with a temperature between -10 ºC and +40
ºC, humidity not exceeding 85% non-condensing. All external cables should be installed safely to avoid
mechanical damages.
FAD-40 instruments are very low level signal measuring instruments. To avoid electrical noise, the instruments
should be separated from equipment that produces electrical noise. Preferably use a metal cabinet against
radio frequency interference, to protect against electromagnetic disturbance the cabinet shall be connected to
ground. Keep the load cell cable trays separated from others, if possible. If there is noise-generating equipment
such as heavy load switches, motor control equipment, inductive loads etc., please be careful against the EMC
interference in the cabinet. If possible protect FAD-40 instruments by a Faraday cage or install them in a
separate section or install them far away from this kind of equipment. Install parallel reverse diodes to the DC
inductive loads like relays, solenoids etc. to minimize voltage peaks on the DC power lines.
3.1.2. Cabling
All cables coming to the control cabinet shall be shielded. Please use separate cable trays for these low signal
level cables. Distance from load cell cables, interface cables and DC power supply cables to power line cables
shall be 50 cm at minimum.
3.1.3. Mechanical Installation
After designing the control panel and installing DIN rails according to the recommendation in this chapter, place
the FAD-40 instruments on the DIN rail Be sure that the mechanical installation of the instruments is done
properly.
3.2. Electrical Connections
Warning:
Please always remember that FAD-40 instruments are very low voltage measuring instruments. Your
control cabinet design and proper installation increases the reliability and the performance of the instrument.
Please do not forget that the instrument must be powered off before inserting or removing any peripheral
connector. All required electrical connections should be done as described below.
3.2.1. Power Supply and Grounding
The power supply voltage of the instrument shall be between 12 V DC and 28 V DC. The current consumption
of the power supply will be calculated by multiplying 0.2 A and the quantity of instruments. The pin configuration
of the 24 V DC power supply connector located at the bottom front of the instrument is shown below in
figure 4.1.
FAD-40 and
FAD-40MB
(front view)
FAD-40EN,
FAD-40PB,
FAD-40PN and
FAD-40CO
(front view)
24V 0V
24V 0V
TX RX GND Shield
Warning:
Do not forget to connect the Shield pin to the reference ground.
Figure 4.1
– The pin layout of 24 V DC connectors
