socomec SUNSYS H30 - Installation Safety and Connections

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SUNSYS H30-H30i - Ref.: IOMSUNHMXX04-GB 00
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3. INSTALLATION
WARNING!
Make sure the electrical installation and the system comply with relevant national regulations.
The diagram of a typical inverter installation is illustrated in figure 3.6-1.
DANGER!
Risk of electric shocks from live device parts!
The inverter can be connected to two separate power sources:
• DC cable – Power from the photovoltaic generator
• AC cable – Power from the mains network, supplied by the electricity company
Before carrying out any work, make sure the electricity sources have been disconnected.
3.6-1
Photovoltaic system diagram
PV
array
Bipolar DC
disconnection
switch
Bipolar AC
thermal-magnetic
disconnection
switch
3.5.1. Network disconnection
A protection and disconnection system for the AC network should be installed on the fixed switchboard.
For correct installation, we recommend using a C curve 16 A thermal-magnetic switch.
3.5.2. Photovoltaic fi eld disconnection
WARNING!
Before carrying out any photovoltaic field connection procedures, make sure the DC power switch is disconnected.
To prevent risks to operators and systems resulting from incorrect handling (opening of the switch when charged), we recommend
the use of DC switches capable of opening the circuit at the maximum specified PV field short-circuit current and voltage levels
(check the values in the technical data table).
3.5.3. Protection against fault currents
The inverter is fitted with a unit which monitors and detects fault currents; this is sensitive to all types of ground fault current.
We recommend the application of an external type A 30 mA differential protection device with low sensitivity (S).
The differential protection device to be used may depend on the photovoltaic field installed, that is the equivalent parasitic capacity
of the photovoltaic modules in relation to earth. In fact, during operation, a current is created and discharged to earth; its value
depends on the type of module mounting used (structure, expanse, type of panels) and the meteorological conditions (rain, snow,
humidity...). If the equivalent parasitic capacity between the modules and earth is high (in general, over 200 nF) it may be necessary
to use a differential device which triggers at fault currents over 100 mA.
3.5.4. Protection against transitory over-voltages
The inverter is designed for transitory over-voltages in category II installations for AC terminals. If the inverter may be subjected to
transitory over-voltages in category III installations, protective SPD dischargers must be provided for the AC power supply network.
If the photovoltaic panels are more than 10 metres away from the inverter, we recommend SPD dischargers are also installed on
the DC side.