Inverter Start/Stop; Starting The Inverter; Inspection Before Starting The Inverter; Steps To Starting The Inverter - Sungrow SG500MX Operation Manual

4 Inverter Start/Stop

4.1 Starting the Inverter

4.1.1 Inspection before starting the inverter

After the maintenance or service work, you may start the inverter. Inspect the following
requirement before starting the inverter:

All connections are done by strictly following the installation manual and circuit diagram.

The coverings of the internal devices are fixed and secured.

The cabinet door is closed and the key is removed and stored by appointed personnel.

The emergency stop button is released and the Start/Stop switch is in the "Stop" position.

Turn the AC (Grid) Main Switch and the DC Main Switch to the "OFF" position.

Make sure, via suitable instruments, that there is no ground fault of the PV modules.

Measure the DC and AC current with multimeter to check if they fulfill the inverter startup
conditions and there is no overvoltage hazard.
After longtime storage, a thorough and professional test is necessary before starting
the inverter.

4.1.2 Steps to Starting the Inverter

When the abovementioned conditions are fulfilled, proceed as follows to start the inverter:
Open the inverter AC cabinet door; Turn the AC switches to "ON" position; and lock the AC
Step 1
cabinet door.
Close the switches of inverter upstream combiner box;
Step 2
Open the DC cabinet door; Turn the DC switches to "ON" position; lock the DC cabinet door and
Step 3
wait 1 minute.
Turn the Start/Stop switch to the "START" position to start the inverter;
Step 4
After startup, the inverter will automatically check if parameters of the DC and AC side meet the
grid-connection requirements. If so and the set time have been reached, the inverter will turn to
the OPERATION mode and feed the generated AC current to the grid.
 Inverter needs no manual control in daily operation. Open the cabinet door only for
maintenance or troubleshooting and by qualified personnel only.
 Keep the door closed and locked and store the keys of the door by appointed
personnel during normal operation.

4.2 Stopping the Inverter

Inverter stops during normal maintenance and service work or when a fault occurs.
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