Eps Mode (Off Grid) - Operation - ZCS Azzurro HYD3000-ZP1 Quick Manual

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.
N
GRID
F
PE
N
LOAD
F
PE
CRITICAL LOADS
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.
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.
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.
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.
230V
It should also be
noted that the
LOAD output
remains powered
at all times, even
when the mains
voltage is present.
230V
CHANGE-OVER
SWITCH

17.3 EPS MODE (OFF GRID) - OPERATION

N
F
N
F
GRID AND
UTILITIES
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
0
0
Position 2→ Priority loads connected and
powered by the grid
PE
PE
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