4-20mA to -10-10V ? urgently
- Thread starter juzeko
- Start date
OkiePC
Lifetime Supporting Member
Zero to ten volts is easy to obtain in readily available products.
Negative ten volts to positive ten volts is a problem.
a 250ohm resistor will give you 1-5vdc.
Edit: Here's one:
http://www.wici.com/products/model/wici/dinmods/dr4300_t.htm
Negative ten volts to positive ten volts is a problem.
a 250ohm resistor will give you 1-5vdc.
Edit: Here's one:
http://www.wici.com/products/model/wici/dinmods/dr4300_t.htm
Last edited:
Mickey
Lifetime Supporting Member
rdrast
Lifetime Supporting Member
Something like:
http://www.actionio.com/products/actionpak/signalcond/ap4382.html
Or the equivalent signal conditioner / Isolator.
Now, that was 3 fast responses
http://www.actionio.com/products/actionpak/signalcond/ap4382.html
Or the equivalent signal conditioner / Isolator.
Now, that was 3 fast responses
LJBMatt
Member
juzeko said:thx! but i need shema of it, so i can make it myself
Yikes! Most of these items are signal conditioners and converters on PCBs. I doubt anyone is going to have a PCB schematic for you and by the time you make one you'll have spent as much as you could have bought one i'm afraid.
Why Can i do something like this? anyone?
For exemple if Iin=1mA, R1=750Ω, R2=500 Ω, i have Vout=-0.5V,
And for Iin=4mA, R1=750Ω, R2=500 Ω, i have Vout=-3V,
and for Iin=20mA, R1=750Ω, R2=500 Ω, i have Vout=-10V,
and for Iin=-20mA, R1=750Ω, R2=500 Ω, i have Vout=10V
John Gaunt
Member
Moore Industries
3 way isolator (INPUT OUTPUT SUPPLY all isolated from each other)
Specify any common input
Specify any common output
Select supply AC or DC (I recommend use 24 Volts DC)
3 way isolator (INPUT OUTPUT SUPPLY all isolated from each other)
Specify any common input
Specify any common output
Select supply AC or DC (I recommend use 24 Volts DC)
How is your Op Amp Theory?
You could convert the 4-20 mA signal to 2-10 volts with a 500 ohm resistor. Then design a summing op amp circuit that will sum the 2-10 volts with a fixed negative voltage to get -10 to +10 volts out. The trick will be to get the gains correct for each of the signals. If you cannot do this, purchase one of the units suggested. Its not worth it to try and build one yourself.
You could convert the 4-20 mA signal to 2-10 volts with a 500 ohm resistor. Then design a summing op amp circuit that will sum the 2-10 volts with a fixed negative voltage to get -10 to +10 volts out. The trick will be to get the gains correct for each of the signals. If you cannot do this, purchase one of the units suggested. Its not worth it to try and build one yourself.
For $100 use this it will do it for you.
http://web5.automationdirect.com/adc/Shopping/Catalog/Process_Controls/Signal_Conditioners/FC-33
http://web5.automationdirect.com/adc/Shopping/Catalog/Process_Controls/Signal_Conditioners/FC-33
Last edited:
ndzied1
Lifetime Supporting Member
Rich1955 said:
Doesn't have the negative side of the output ranges:
juzeko:
What are you really trying to do? Things with +/- analog signals are usually valves or servo motors. Do you really need a valve driver or servo drive?
Im student and i need to have -10 to 10V input to some maketa with second order system. And it has to be from PLC, to get some step input and so on(need to build MRAC system its for my final work and dead line is coming soon ). I managed to do it with that shema i draw few threads before. I managed to get -0.5 to -10.25V and by swaping input wires from PLC i managed to get 0.5 do 10.25V. It works fine.
Sorry for bad english, and thx for advices.
). I managed to do it with that shema i draw few threads before. I managed to get -0.5 to -10.25V and by swaping input wires from PLC i managed to get 0.5 do 10.25V. It works fine.Sorry for bad english, and thx for advices.
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