Sungrow SG3425UD-MV, Системное руководство

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Disconnection of the AC & DC 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 maintenance work,
• Disconnect the AC & DC switches;
• Disconnect the upstream and downstream switches of the module.
12.2.2 Five Safety Rules
Respect the following five rules in maintaining or servicing the MV Station.
• Disconnect the module from all the external connections and internal power supplies.
• Ensure that the module will not be started accidentally.
• Verify that the module interior is discharged completely with a multimeter.
• Perform necessary ground and short circuit connection.
• Cover the adjacent electrical components with insulation cloth during operation.
12.3 Maintenance
12.3.1 Introduction
The MV Station can be installed outdoors. Harsh environment condition or long-time
operation, however, may cause age and damage of the MV Station. Check and maintain the
MV Station periodically and replace the aged components can effectively enlarge the
service life and increase the device performance inside the MV Station.
Unscheduld maintenance is also required, esp., when the system performance is
poor.
12.3.2 Maintenance Interval
Maintain the MV Station and internal electric devices periodically to ensure the good
performance of the MV Station.
The maintenance interval described in this chapter is indicative only. The actual interval
depends on the on-site environment condition. If the MV Station is located in harsh
environment places, for example desert arrears, the maintenance interval shall be
shortened. Particularly, cleaning and anti-corrosion processing should be performed more
frequently.
If the MV Station is located in desert areas, it is advisable to check thoroughly the MV
Station inside and outside and clean completely after the sand storm.
12 Routine Maintenance System Manual