Fairbanks PC2250 Utility Software - Manual (Page 20)

6/12 20 51214 Rev. 7
Section 4: Accessories
4-20 mA Analog Output
16 bit Resolution and Monotonicity
0.01% Non-Linearity
Front Panel Programmable or via PC2250 utility software program
Passive (does not supply the voltage for the current loop)
Requirements:
External device must furnish 7 VDC to 40 VDC
The negative of the supply MUST be isolated from chassis ground
A separate power supply must be furnished for each FB2250
Wiring & Testing:
Follow these steps to text the 4-20 mA Analog Component.
1. Remove the four (4) screws fastening the back of the Indicator and open it.
2. Connect the Multimeter in series with the 4-20 mA Analog Output Loop, as noted
below.
TB1-1 (+) Power
TB1-2 (–) Power
If the device is passive, an auxiliary power supply must be used to supply the voltage
for the current loop. Wire it as shown.
FB2250 Condition
4-20 mA
analog output
FB2250 behind zero 3.5 mA
Weight below 4.20 LO 3.5 mA
Weight above 4.20 HI 24 mA
Program Mode Locked on last 4-20 mA reading
Notes:
Loop power should be turned off whenever the FB2250 is turned off.