Flintec FAA-26 - Manual (Page 12)

FAA-26, Technical Manual, Rev. 1.1, June 2014 Page 11 / 13
The analog output value at any loading is
Analog
Output
= Minimum output +
Maximum output
– Minimum output
* Load
Scale capacity
Example:
Scale capacity
100kg
Output range 4 – 20 mA
Load 25kg
The 4-20mA analog output current will be ;
I
out
= 4mA + (( 20mA
– 4mA ) / 100kg ) * 25kg = 4 + 0.16 * 25 =
I
out
= 8 mA
The 0 – 10 VDC analog output voltage will be:
V
out
= 0 + (10V / 100kg ) * 25 kg = 0,1 * 25 =
V
out
= 2.5 VDC
Increase or decrease the analog output by gain adjustment rotary switch to measure
the calculated output value above. Please make gain adjustment rotary switch
“ 0 “
position.
5.2 Adjustment at PLC
All instruments are adjusted in the production to operate in its analog output range
between 0 mV and 10 mV load cell signal as default (only for 2mV/V load cells).
Current output default adjustment is 4
– 20 mA and Voltage output default range is
0
– 10 VDC .
For example if the instrument is at factory default values and programmed to operate
4
– 20 mA output range, the output will be 4 mA at 0 mV load cell signal and will be
20 mA at 10 mV load cell signal.
Changing the FAA-26 instrument the re-calibration is not required because of
matching instruments in production at Flintec.
5.3 Testing the Scale Performance
You should check your scale performance by testing the scale eccentricity, scale
linearity at loading up to maximum loading value, repeatability etc. before using it
.