Operation Mode; Mode Change; Operation Modes - Sungrow SG500MX Operation Manual

5 Operation Mode

5.1 Mode Change

After being energized, inverter can switch among different modes as shown in the figure below.
Upv is the DC input voltage of the inverter.
UpvStart is the inverter DC side startup voltage.

5.2 Operation Modes

Stop
This is the initial state of the inverter. The inverter DC and AC switches are in the "OFF" position;
the upstream and downstream connections are disconnected. The inverter is therefore
electricity-free.
Initial Standby
When the inverter upstream and downstream connections are connected and the AC/DC
switches are in the "ON" position, the inverter turns to the Initial Standby mode.
Inverter will continuously check if the PV array and the grid meet the grid-connection
requirements. If the inverter DC input voltage is higher than the inverter startup voltage and the
startup time is reached, whilst the requirements of the grid side parameter are satisfied, inverter
will turn from the Initial Standby mode into the Startup mode.
Fig. 5-1 Operation modes change
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