REFUSOL 40K - External Turn off Signal; Overview; Function

56 REFUsol 40K / 46K-MV REFU Elektronik GmbH
8.2 External Turn Off Signal
8.2.1 Overview
REFUsol solar inverters have an internal grid protection relay and section switch.
Depending on local connection, installation instructions and the selected line voltage level either the internal
grid protection relay can be used with section switch, or an external grid protection relay must be used with
section switch also.
It is also possible to combine the internal to the external grid protection relay.
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1 Photovoltaic modules
2 Solar Inverter
3 Three phase, redundant section switch
4 Control line
5 Grid measurement
6 Grid protection device
7 Public grid
8.2.2 Function
T
he internal section switches of the inverter can be controlled by an external signal.
At a signal voltage between 7.5 and 10 V the inverter feeds into the grid. If the signal voltage falls below 7.5 V,
an error message will occur and the inverter will stop to work within the configured switch of time.
Nominal voltage 10 VDC
Voltage (operation) 7.5 … 10 VDC
Voltage (Stop) 0 … 7.5 VDC
Standard switch-off time inverter 50 ms
Switch-off time range 50 ms … 100 ms