ABB PVS300, Product Manual

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Operation basics and hardware description 23
3
Operation basics and
hardware description
What this chapter contains
This chapter briefly describes the construction, operation and control principle of the
PVS300 string inverter.
Overview
The PVS300 transformerless string inverter converts direct current (DC) generated
by the solar arrays to single phase alternating current (AC). The AC is then fed to
either the public electricity grid or to a load circuit which is connected to the public
electricity grid.
PVS300 is suitable for small and medium-size photovoltaic (PV) systems.
PVS300 is designed for installation in air-cooled outdoor rated enclosures. Installation
is performed with the help of a mounting plate. The DC and AC cable connections at
the inverter are made with quick connectors.
Two variable speed fans operate on a demand basis. A stirring fan prevents the
formation of heat pockets around the control board. A cooling fan provides air flow to
the heat sink and power electronics circuit boards. The fresh air intake for the cooling
fan is located in the cabling section of the inverter. A narrow gap between the inverter
and the mounting plate works as an air vent.
PVS300 provides comprehensive functions for system protection, system supervision
and external communication.
After the inverter has been installed and commissioned, it operates automatically
according to the following principle: