48 GC250 Technical Manual
EAAM057608EN
5.9
The connection with the public electric mains happens by means if terminals
T.22, T.24, T.26,
T.28,
using protection fuses (suggested 1A)
Depending on the type of plant:
•
SPM: the mains is not connected with the device; the terminals remains unused.
•
SSB: the mains is connected with the device. In this way, the controller can
acknowledge faults on the mains and start the genset.
Three-phase connection:
Connect the neutral (if any) (N) to the terminal
T.28
Connect phase L1 (or R) to the terminal
T.26
Connect phase L2 (or S) to the terminal
T.24
Connect phase L3 (or T) to the terminal
T.22
Single-phase connection:
Connect the neutral (if any) (N) to the terminal
T.28
Connect phase L to the terminal
T.26
Parameters P.0119 allows to select the three-phase/single-phase mode.
For CAT.III use, the maximum working voltage is 300Vac (phase-neutral) and 520Vac
(phase to phase). Maximum voltage to ground is 300 Vac.
The controller board uses phase L1 (terminal
T.26
) ) to measure the frequency of the
generator.
5.9.1
Measurement of the mains neutral
The device, in three-phase connection, can function both with the neutral connection and
without it; selection is performed through the P.0129 parameter.
If the system is configured with the neutral connection, the neutral voltage is measured in
relation with GND.
The values of the V1-N, V2-N and V3-N phase voltages and the VN voltage of the neutral in
relation to GND for the mains are displayed on page M.03.
