Routine Maintenance; Safety Instructions; Safety Rules; Five Safety Rules - Sungrow SG500MX Operation Manual

9 Routine Maintenance

Due to the effect of ambient temperature, humidity, dust and vibration, the inner components
of the inverter will be aging and worn out. To ensure the system safety and maintain the
efficiency of the inverter, it is necessary to carry out routine and periodic maintenance.
All measures, which can help the in inverter be in good working conditions, are within the
maintenance scope.

9.1 Safety Instructions

9.1.1 Safety Rules

Only qualified personnel can perform the work described in this chapter.
Do not leave any screws, washers or other metallic parts inside the inverter to avoid
damages to the inverter.
Disconnection of the switches in no way implies that there is no voltage of the cable
connection terminals inside the AC and DC cabinet. To avoid the risk of electric shock
before opening the cabinet door,
 Disconnect the switches;
 Disconnect the upstream and downstream switch of the PCS.
Wait at least 5 minutes after inverter stops before any work on the inverter.

9.1.2 Five Safety Rules

Respect the following five rules during maintenance or service on the inverter to ensure the
safety of the maintainer.

Disconnect the inverter from all the external connections and internal power supplies.

Ensure that the inverter will not be started accidentally.

Verify that the inverter interior is discharged completely with a multimeter.

Necessary ground and short circuit connect.

Cover the adjacent electrical components with insulation cloth during operation.

9.2 Maintenance and Interval

Recommended routine maintenance work and maintenance interval are shown in the following
table.
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