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Voltages may still be present on cable connection terminals inside the AC and DC
cabinets even though the AC & DC switches are disconnected. To avoid electric
shock hazard, perform the following operations before starting maintenance work,
• Disconnect the AC & DC switches;
• Disconnect the upstream and downstream switches of the inverter.
Five Safety Rules
Respect the following five rules in maintaining or servicing 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 inadvertently.
• Verify that the inverter interior discharges 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 Overview
For maintenance items beyond this manual, please confirm with SUNGROW or
contact SUNGROW for maintenance, and unauthorized operation is strictly
prohibited.
12.3.2 Introduction
The inverter can be installed outdoors. Harsh environmental condition or long-time
operation, however, may cause aging and damage to the inverter. Check and maintain the
inverter periodically and replace the aged components, which can effectively prolong the
service life and improve the performance of the devices inside the inverter.
Unscheduled maintenance is also required,esp.,when the system performance is
poor.
12.3.3 Maintenance Interval
Maintain the inverter and internal electric devices periodically to ensure the good
performance of the inverter.
The maintenance interval described in this chapter is indicative only. The actual interval
depends on the on-site environment condition. If the inverter is located in harsh environment
12 Routine Maintenance System Manual
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