Hi, I’m looking to make a data-logger to log voltage and current from a 750V DC source. I already have a current transducer and a voltage transducer fitted in a system, but want to piggy back off these by connecting them to an arduino to log the data to an SD card/USB drive.
The Voltage transducer (LEM DVC1000) is a 4 wire sensor and provides a 4-20mA current signal out of the secondary side. I have found various posts regarding 4-20mA current loop sensors.
The current transducer (LEM ITC2000) looks like it provides a 0-1.2A signal out of its electronic interface.
I also will be looking to tag RTC/GPS to each sample. I have a good idea on what to do for this.
Could anyone guide me on this? Best ways to wire the signals to the arduino. I have an arduino uno R4 WiFi.
I do not recommend you connect a resistor in series with the 4-20 loop and measure the voltage drop.
The best would be to use a hall effect current sensor. Using the Hall effect sensor can measure DC current by detecting the magnetic field generated by the current flowing through a conductor. This allows for a safer contactless measurement of the current without interrupting the circuit.
It appears you have a voltage sensor that is also 4-20mA so a second hall sensor would do it.
Both transducers use current as the signal. Connect a resistor between an analog input and ground.
For a 5 volt logic Arduino use the value of 5 / 0.020 for the current loop device and 5 /1.2 for the current transducer. Regard the heat of 6 Watt from the current resistor.
For 3.3 volt levels change 5 to 3.3. 4 Watt of heat.
The output is a current that goes up to 20mA (for 1000V full scale), but the sensor is bi-directional. If you apply the voltage in the reverse direction the current goes to -20mA.