Installation Manual WTS3 Series II
M013610b.doc 9
RANGE CALIBRATION 0-10V and 4-20mA
• Connect a voltmeter to voltage output between + Vout e - Vout .
• Switch on the system and wait about 15 minutes for warm-up.
• Be sure the weighing system is completely empty.
• Rotate switch SW2 and trim-pot P2 to read the voltage output value to zero. For this
purpose use the lower range of the voltmeter.
• Load the weighing system with the full scale dead weight.
• Rotate switch SW1 and trim-pot P1 to exactly reach 10 V.
The system is now calibrated with the output voltage in the range 0 - 10 V and the current output in
the range 4 - 20 mA (SW3 = ON : factory setting).
RANGE CALIBRATION 0-10V and 0-20mA
If you need to use the 0 - 20 mA steps follows :
• Select switch SW3 = OFF on board.
• Follow the steps described in 6 points to the paragraph from the previous section.
• Connect then the amp-meter to -Iout +Iout.
• Load the scale with full scale weight and rotate the trim-pot P4 up to 20mA reading on the
measuring instrument.
The system is now calibrated with the output voltage in the range 0 - 10 V and the current output in
the range 0 - 20 mA.
ATTENTION :
If it is not possible to arrange the exact value corresponding to the full scale, use a dead weight
greater than 50 % (at least) of full scale value and calibrate the voltage output with the calculated
value as shown below :
dead weight : X = full scale value : 10 V
where X = voltage to read on the voltmeter with the dead weight on the scale.
Example :
1250 x 10
X = —————— = 6.25 V
2000
In this case with a dead weight of 1250 Kg the voltage output should be regulated to 6.25 V.
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