Starting/Stopping; Starting; Inspection Before Starting; Start Steps - Sungrow SG3425UD System Manual

Starting/Stopping

8
8.1

Starting

8.1.1 Inspection before starting

After the maintenance or service work, inspect the following items, and then start inverter:
• All connections are performed in strict accordance with relevant manual and circuit
diagram.
• The coverings of the internal devices are fixed and secured.
• The emergency stop button is released.
• Make sure, by using suitable instruments, that there is no ground fault of the PV array.
• Measure the DC, AC voltages with a multi-meter to check if the start-up conditions are
met, and ensure no overvoltage hazard.
• Measure the DC voltage with multi-meter, and check if the polarity is correct.
If the inverter has been stored for more than half a year in the required storage
environment, a thorough and careful inspection is necessary before the inverter is
powered on.

8.1.2 Start Steps

When the abovementioned conditions are fulfilled, proceed as follows to start the MV
Station:
step 1 Close the upstream PV combiner box and downstream transformer switches of the MV
Station.
step 2 Close the QS6 AC maintenance switch, and QS5 DC maintenance switch.
step 3 Turn the DC knob switch to the ON position.
step 4 Stop the inverter through the touch screen.
step 5 Manually close the QS1 and QS3 DC load break switches. If the inverter was equipped with
energy storage ports,close QS2 and QS4 as well.
step 6 Perform the start operation through the touch screen, and the MV Station starts grid-
connected operation.
- - End
Specific switch position，refer to "figure 3-1 DC cabinet".
51