JesperMP said:Hello Jelf.
Is the problem, that the datalogger has another input voltage than the 24V that you have available (10V for example) ?
If so, then yes you can connect it via a voltage splitter like you suggest.
And yes, you also have to connect the common.
That in it self does not mean that the input channel of the datalogger is tied in with the same common. As I dont know your datalogger, it may have an isolated input.Jelf said:I'm using this same +24 V DC as a power supply for datalogger, so I planned to use this to feed measuring circuit.
Of course. However, 24VDC and an input with high input impedance should be no problem.Jelf said:Is there normally some limits regarding maximum voltage and/or current that can be fed through potential free connection?
What exactly is it that you want to do ?Jelf said:If needed I can reduce voltage to connection to PLC with for example voltage splitter. And same with current if there is maximum current through potential free connection.
JesperMP said:That in it self does not mean that the input channel of the datalogger is tied in with the same common. As I dont know your datalogger, it may have an isolated input.
Of course. However, 24VDC and an input with high input impedance should be no problem.
What exactly is it that you want to do ?
I sense some confusion here.
What voltage is the input on the datalogger ?
rPraveenkum said:so you want to log the Motor RPM once it reaches its full rpm thats your application & requirement?
Unless you state some information that clarifies why you want to "reduce current" and "measure over resistor" then I cannot say if "that shouldn't be problem".To get this information I planned to feed circuit with voltage, reduce current to say 10 mA and measure voltage over resistor with datalogger.
What voltage is the input on the datalogger ?
Jelf said:Hello Jesper,
I know my datalogger, and that's the way it should be powered and measured. So no problem with the use of datalogger.
PLC's free potential contact closes, if motor's spesified RPM is achieved. I just want to record this information for couple of weeks with datalogger. To get this information I planned to feed circuit with voltage, reduce current to say 10 mA and measure voltage over resistor with datalogger.
I hope that answered to your question.
If I understood correctly, that shouldn't be problem?
rsdoran said:Undoubtedly you do not know something about the datalogger or you would not be asking this question.
The point,that is trying to be given, s that regardless of how you wire the voltage/current value through the relay contact if the datalogger is not wired with the source voltage common then it will not read it.
IF the datalogger is powered with the same 24vdc source then why do you need to limit voltage/current.
So far you are stating you know the equipment, you know the wiring is correct, but asking us if it will work. How would we know? You will not answer the questions asked.
IF the datalogger is powered with the same 24vdc source then why do you need to limit voltage/current.
Is there normally some limits regarding maximum voltage and/or current that can be fed through potential free connection?
(This is my final attempt)JesperMP said:Like said before:JesperMP said:What voltage is the input on the datalogger ?
JesperMP said:What voltage is the input on the datalogger ?
Like said before:
(This is my final attempt)