NOVUS DigiRail-VA - Manual (Page 9)

DigiRail-VA
NOVUS AUTOAMTION 9/19
The 4-20 mA output is NOT isolated from the 0-10 V output, as they are interconnected
through the "negative" pole. In addition, this conductor is also connected to the negative of the
power source!
Therefore, care must be taken when using the outputs 4-20 mA and 0-10 V to send signals to
other devices that are powered by the same source than the DigiRail-VA.
If outputs 4-20 mA and 0-10 V are used simultaneously there may be problems if both are
read by another computer that has no they own isolated inputs.
0-10 V OUTPUT
The 0-10 V output can be used to transmit any of the measures in the AC input:
•
RMS Voltage
•
RMS Current
•
Active Power
•
Apparent Power
•
Reactive Power
•
Power Factor
•
Frequency
This output can be disabled if necessary.
The transmission is based on the full scale of the desired variable (e.g. 0-5 A for the rms current) or based on a reduced
scale (e.g. transmit a current effective value of range of 0.5 to 3 A, where 0.5 A corresponds to 0 V and 3 A corresponds
to 10 V).
Finally, you can select the behavior of the output 0-10 V on error: voltage equal to 0 V or exceeding 10 V.
Fig. 10 – Connecting the 0-10 V output
The 0-10 V output is NOT isolated from the 4-20 mA output, as they are interconnected
through the "negative" pole. In addition, this conductor is also connected to the negative of the
power source!
Therefore, care must be taken when using the outputs 4-20 mA and 0-10 V to send signals to
other devices that are powered by the same source than the DigiRail-VA.
If outputs 4-20 mA and 0-10 V are used simultaneously there may be problems if both are
read by another computer that has no they own isolated inputs.