NOVUS DigiRail-VA - Manual (Page 6)

DigiRail-VA
NOVUS AUTOAMTION 6/19
AC INPUTS
The measurement circuit is electrically isolated from the rest of the equipment (power circuits and interfaces). However,
great care must be taken with electrical wiring connections (see section "Electrical Installation"). Take care to comply
with the maximum voltage and current set (see "Technical Specifications"). To measure higher voltages or current levels
to be measured, you should use current or voltage transformers (see section "Using current transformers and voltage
transformers").
The current measurement is done by an internal shunt resistor, so that the DigiRail-VA is connected in series with the
load to be measured. The following figure illustrates the device connected to the measuring circuit.
Fig. 04 – Measurement of voltage and current
Despite being common simultaneous measurement of voltage and current, you can connect just the part on the voltage
or current for measurement. In such cases, the measurement of the variable not connected will present value near zero
as the calculated values of the side variables (power and power factor). The figures below illustrate the connections in
these cases.
Fig. 05 – Solely measurement of voltage