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Step 3 Check and ensure that the AC circuit breaker QF1 of all inverters is disconnected.

Step 4 Disconnect the DC load switch QS1 inside all inverters.

Step 5 Disconnect the maintenance switch QS2 of all inverters.

Step 6 Disconnect the internal switch of the power distribution cabinet QS9.

Step 7 Disconnect the load switch of the transformer and the output switch of the upstream PV

combiner box.

For the position of the above switches, please see "3.3.2 Internal Structure of In-

verter Unit" and "6.9 External Equipment Connection"。

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7.5.2 Unplanned (Emergency) Powering Down

Step 1 Press the emergency button. Turn the DC knob switch to the “OFF” position.

Upon pressing the emergency stop button, only the AC circuit breaker and DC load

switch will open. The internal auxiliary power supply and PCB board will still carry

voltage. Do not touch them!

Step 2 Check and ensure that the AC circuit breaker QF1 of all inverters is disconnected.

Step 3 Check and ensure that the DC side load switch QS1 of all inverters is disconnected.

Step 4 Disconnect the maintenance switch QS2 of all inverters.

Step 5 Turn the main switch QS9 inside the power distribution cabinet to OFF

Step 6 Disconnect the load switch of the inverter and the transformer and the output switch of the

upstream PV combiner box.

For the position of the above switches, please see "3.3.2 Internal Structure of In-

verter Unit" and "6.9 External Equipment Connection".

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System Manual 7 Powering up and Powering down

Sungrow MVS4480-US System Manual

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