SMA SUNNY CENTRAL Maintenance manual - Manual (Page 39)

SMA Solar Technology AG Maintaining the inside of the switch cabinet
Maintenance Manual SCWAR-WEN094020 39
5.2 Cleaning the power unit of the heat sink
As a rule, cleaning the power unit of the heat sink is only required in case of an inverter failure. The
dirt is usually absorbed by the protective grids. These grids are designed in such way that the hole
diameter is as large as the openings of the heat sink.
The figure below shows the heat sink (A) of a Sunny Central 250
If the heat sink is contaminated, it can be cleaned using compressed air. Cleaning with a vacuum
cleaner is not permissible as this procedure would only allow the cleaning of a small part of the heat
sink.
Maintenance work of the power unit of the heat sink
The power unit of the heat sink requires almost no maintenance work, an optical check is
sufficient.
DANGER!
Death resulting from electric shock and burning upon touching the medium-
voltage grid's live components.
• Only work on the device when it is switched off and voltage-free.