Mains Connection - Ducati Energia REGO 5 Manuel D'instruction

If the current to the C.T. secondary winding falls below 200mA,
the controller will disconnect all the banks and the display will
show"COS" in turn with flashing ".-.-." .
It will go into standby until a current exceeding that value is
restored.

5) MAINS CONNECTION

The REGO reactive power controller may be connected to the mains
according to three different configurations (see diagram in Fig. 3 - Page 3).
"FF1" In this configuration (default) the C.T./5A is positioned on phase
R(L1) and the reference voltage is drawn from the line voltage
between phases S(L2) and T(L3). This is the classic varmetric
connection. This is the type of connection utilized in DUCATI
ENERGIA automatic power factor correction systems.
"FF2" In this configuration the C.T./5A is on phase R(L1) whereas
the reference voltage is the line voltage between phase R(L1)
itself and phase S(L2).
Warning: if the cyclical direction of the power supply phases is not
known, configuration FF2 may give rise to an error in the power factor
measurement.
"F-n" In this configuration the C.T./5A is on phase R(L1) whereas
the reference voltage is the phase-neutral between phase
R(L1) itself and the neutral N. Use this configuration only for
single-phase networks.
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