CHANGE-OVER SWITCH
When performing maintenance on components of the photovoltaic system or when the inverter is unavailable for
use, it is recommended to install a change-over switch. This switch allows the loads normally connected to the
inverter's load line to be directly powered by the grid.
DOUBLE SWITCH CONTACTOR
For subsidised systems, a double switch contactor can be installed. This device ensures that critical loads are
normally powered by the grid, and they will only switch to the EPS LOAD line of the inverter in case of a power
failure, thanks to the switching of the contactors.
230V
230V
Under normal operating conditions
with the alternating voltage supplied by the mains
, both the system's standard
loads and priority or critical loads are supplied directly by the mains, eliminating the need for a double switch-over
contactor.
This operation is shown in the figure below.
It should also be
noted that the
LOAD output
remains powered
at all times, even
when the mains
voltage is present.
Position 1
→ Priority loads connected and
powered by the inverter's LOAD line
Position 0
→ Priority loads not powered by
the inverter or by the grid
Position 2
→ Priority loads connected and
powered by the grid
17.3 EPS MODE (OFF GRID) - OPERATION
CHANGE-OVER
SWITCH
CRITICAL LOADS
GRID AND
UTILITIES
Note:
If the hybrid inverter is to be installed under different conditions than those shown in the diagrams above,
please contact technical support to check whether this is feasible.
NOTE:
In the described conditions, during a power outage, the part of the system powered by the inverter's
LOAD port operates in a manner similar to an IT system.
0
0
F
N
F
N
PE
PE
GRID
LOAD
F
N
PE
F
N
PE
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