INSTALLATION AND
PROGRAMMING INSTRUCTIONS
SUNWAY M XS 7500TL
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2.3.
Operating Principle
The power conversion system (inverter) is connected directly to the PV field. By using a high-switching
frequency IGBT bridge, the DC coming from the PV field is converted into AC at the grid frequency. The
transformerless architecture ensures maximum efficiency without affecting safety: the system monitoring
current leakage to earth is integrated into the inverter (integrated RCD) and the redundant grid coupling
devices ensure proper safety even in the event of single fault.
The EMC filters for the suppression of electromagnetic disturbance, the isolation sensor monitoring the
isolation to earth of the PV panels as well as the device controlling the operation in parallel to the grid are
integrated into the inverter. Therefore, no additional device external to the inverter is required.
Figure 1: Block diagram of the SUNWAY M XS
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