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DAC8775: 4-20mA Loop output to actuator Valve

Dheeraj yadav
Intellectual 640 points

Part Number: DAC8775
Other Parts Discussed in Thread: DAC8760

I know DAC8775 IC is not designed for loop power.

i want to know that how i control 4-20mA actuator valve, one wire is connected to actuator ground and one is 4-20mA current output wire but how 24Volt is provide to actuator?  

  • 0
    TI__Mastermind 46290 points

    Dheeraj,

    I'm not really a linear-actuator expert myself, really the only exposure I have had was for a demo once with DAC8760 using an Actuonix L12. That device had 6 wires - one a 12V power supply along with three options for control (voltage, current, or RC-servo input). In that case I had the DAC8760 and the actuator powered from the same external 12V supply.

    I would imagine the conventional setup to be very similar. Typically the 24V power supply for a PLC system is derived from an adjacent / external module so this would presumably be available to power the actuator. I suppose in other applications the actuator may be impractically far away from the controller to be powered by the same supply, so he may have something additional localized to the actuator.