So we are trying to convert this 0-5v voltage into 4-20mA with one of these converters and I am having a hard time wrapping my head around it. Currently, I am using a loop simulator for testing (zeroing, spaning) and I cannot seem to get the span right so I think I am doing something wrong on my end. I can get the zero down pretty well 0v=4ma but that's the easy part anyway. When I turn my loop sim up to 5v I only get 9mA max out of the RIO AI. I have built the diagram for the field and I have built a diagram for the at-home loop simulator please tell me if am doing something wrong or if I need to get a different converter. The 4-20mA will be fed into a Remote I/O analog input card.



Device:
https://www.amazon.com/dp/B07VTRVD75?psc=1&ref=ppx_yo2ov_dt_b_product_details

First Photo is the field view. (Terminals 7-10 are 5v bridged) (11-16 are 0v bridged)
Second is the loop sim at home version 1
Third is the loop sim at home version 2

 

Hi IJ,
Welcome to AAC.
What is the 4-20mA driving into, what is the termination resistance? Pins # 15 & #16 of the AutoD terminals
E

Update: Looking over the AutoD product details, suggests the 4mA to 20mA, is terminated with a 500R load and so requires at least a >10V compliance voltage.
A 0v to +5V will have a maximum current of ~9mA to 10mA.

 

Your 5v supply is probably not enough- more headroom voltage?

 

Hi IJ,
Welcome to AAC.
What is the 4-20mA driving into, what is the termination resistance? Pins # 15 & #16 of the AutoD terminals
E

Update: Looking over the AutoD product details, suggests the 4mA to 20mA, is terminated with a 500R load and so requires at least a >10V compliance voltage.
A 0v to +5V will have a maximum current of ~9mA to 10mA.

Thank you for the kind words. Here is the analog input module

https://www.automationdirect.com/ad...i-z-o/stride_i-z-o/analog_i-z-o/sio-mb08ads-1

 

Thank you for the kind words. Here is the analog input module

https://www.automationdirect.com/ad...i-z-o/stride_i-z-o/analog_i-z-o/sio-mb08ads-1
[/QUOTE

Hi IJ,
Welcome to AAC.
What is the 4-20mA driving into, what is the termination resistance? Pins # 15 & #16 of the AutoD terminals
E

Update: Looking over the AutoD product details, suggests the 4mA to 20mA, is terminated with a 500R load and so requires at least a >10V compliance voltage.

Would you suggest a converter with a higher voltage being supplied? Or just a recommendation in general for a different brand for this application?

 

Your 5v supply is probably not enough- more headroom voltage?

Dang it you're probably right. Have you done this type of application before? I see some converters that use a 24v power supply those might work?

 

https://www.hicomponent.com/isolated-analog-4-20ma-0-5v-10v-converter-slim-size-din-rail.html

I think I'll go with this

 

Hi IJ,
Did you check the input resistance of the Auto modules, 4-20mA terminals?
E

 

https://www.hicomponent.com/isolated-analog-4-20ma-0-5v-10v-converter-slim-size-din-rail.html

I think I'll go with this

This is a 4 to 20mA input, voltage output device. I thought you were looking for the other way around?

 

@Integration Jordan C Hi,
My concern is when using the proposed 10v module is that when he used a 5V module he had a maximum current of 9mA,
So a 10v module would give a maximum current of ~18mA.

The documentation for the AutoD module seems to use a 12v signal level as a standard.

I consider that he requires a 12v module to give the full 20mA.

E

 

This is a 4 to 20mA input, voltage output device. I thought you were looking for the other way around?

You can adjust the set up.

This is a 4 to 20mA input, voltage output device. I thought you were looking for the other way around?

You can adjust the inputs and outputs

 

Hi,
My concern is when using the proposed 10v module is that when he used a 5V module he had a maximum current of 9mA,
So a 10v module would give a maximum current of ~18mA.

The documentation for the AutoD module seems to use a 12v signal level as a standard.

I consider that he requires a 12v module to give the full 20mA.

E

Thank you for the explanation I need to review my Ohms laws in the future. Thank you for helping me understand. I picked up a 0-5v converter to 4-20mA with a 12-24v power supply.