Safety Equipment, On Site - VOLTWERK VC 200 Instrucciones De Servicio

4 Installation location
4.3.5
46
Provide a reliable IT grid.
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Central inverters are designed for grid connection to a medium voltage
transformer and may only be operated in IT (Isolé Terre) grids. Please note:
An IT grid is an unearthed grid.
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In the event of an earth fault, the IT grid is earthed.
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Please note:
Sufficiently dimensioned earthing is required to conduct surge voltages
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away.
Route the earthing to the reference earth via the shortest path.
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The surge voltage protection device and inverter filter units are only
functional when the device is earthed.
Do not earth the neutral point of the medium voltage transformer.
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Safety equipment, on site

External DC disconnector
The DC circuit breakers installed in the device do not meet the
requirements of a disconnector. An external DC disconnector must be
installed upstream of each central inverter. The external DC disconnector
can de-energise the central inverter at the DC side in the event of damage
or for the purposes of checking the solar generator. Please note:
The external DC disconnector must be accessible and easy to reach at
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any time, without aids.
It must be possible to secure the external DC disconnector against
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being switched back on.
Surge voltage protection devices
Depending on the local lightning protection situation, the main low-voltage
distribution board and the DC connection may need to be fitted with type I
or type II arresters. Please note:
A type II arrester is integrated into devices in the levels of performance
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200 kVA and 300 kVA. A type I arrester is integrated into devices in the
level of performance 350 kVA. (see Section "Surge voltage protection
devices", page 18)
External AC disconnector
An external AC disconnector must be installed upstream of each central
inverter. The external AC disconnector can be de-energised, e.g. during
maintenance of the central inverter. Please note:
The external AC disconnector must be accessible and easy to reach at
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any time, without aids.
It must be possible to secure the external AC disconnector against
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being switched back on.
External AC disconnectors must comply with international regulations
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IEC 60364-7-712.
LV HRC disconnectors or AC circuit breakers can satisfy the
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requirements of an AC disconnector.
Operating manual
Transformerless central inverter