Installation Manual WTS3 Series II
M013610b.doc 3
APPLICATION AND PRINCIPLE OF OPERATION
The module WTS3 is an amplifier for strain gage. This amplifier offers a simple and valid
procedure for calibration using rotary switches and trim-pots.
The supply voltage of the transducer is 10 Vdc with the possibility of connection to 4 or 6 wires.
With six-wire connection, making a correct compensation of the voltage drop on the connecting
cables, for a calibration easier and a higher accuracy.
The block diagram following from an indication of the structure of the conditioning module.
Note the simultaneous presence of voltage and current outputs 4-20mA ranges and 0-10 V. The
outputs and the power of the load cell are electrically isolated from the external 24 Vdc. This allows
the connection of several weighing systems to a data collection system (PLC or PC) using the
same power supply (+24 Vdc) shared with other devices without problems.
ELECTROMAGNETIC COMPATIBILITY (EMC)
WTS3 conditioner meets EEC 89/336 directive requirements.
Due to its plastic box it is sensible to radiated interferences generated by radio transmitters.
Installation suggestions :
• Use earthed shielded cables. To improve shielding efficiency, both sides of the cable shield can
be connected to earth. This is permitted when low values of earth resistance are detected.
• Install the board in a earthed metal box. If the board is placed into a metal cabinet with other
systems, further shields are not necessary.
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