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User Manual 3000SP
Rev. 1.1 16/03/2021
Identification: MD-AL-GI-00
Rev. 1.1 of 16/03/2021 - Application: GID
Figure 53 – Screen relating to the CT Direction submenu
For each of the three sensors installed, the three lines show the reading of the power measured, the
direction of this power and the Power Factor; for example, the figure shows a CTa sensor reading
equal to 1.85 kW being imported from the grid towards the utility; in this case, the Power Factor
indicates the phase shift of the current measured with respect to the voltage and this parameter
helps to understand if the sensor is on the correct phase in case of installation on a three-phase
system.
The measurements taken by the current clamp, as shown in the previous procedure, can therefore be
replaced by the power readings shown in this menu. Therefore, when turning on the system (or
during the initialisation), it is necessary to make sure that all three phases have a power of more
than 500W in IMPORT conditions in order to correctly direct the three phases.
You can check whether the sensor has been installed on the correct phase by means of the Power
Factor: Power Factor values higher than 90% indicate that the sensor connected to this input (e.g.
the CTb sensor) is positioned on the correct phase.
NOTE
: To ensure a correct reading of the Power Factor, an absorption of more than 700W is needed,
as lower powers could affect the reading sensitivity of the sensor, thus distorting the PV calculation.
If in these conditions the sensors are not correctly positioned on the phases of the system, the Power
Factor value will be considerably lower than 60%, and the alarm signal will appear <!> as shown
below.
Figure 54 – CTb and CTc sensors installed on incorrect phases
