ABB PST Series Installation And Commissioning Manual page 115

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This chapter describes the maintenance required for the
softstarter. In principle, the product is maintenance free
but some items should be checked regularly.
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• Check that all mounting bolts/screws are fastened.
Tighten if necessary.
• Check that all connections of main, control- and supply
circuits are fastened. Tighten the terminal screws and
bolts on the connection bars, if necessary.
• Check that the cooling airways are free from dirt and
dust. If required, use pressurised air to clean.
• Check external filters. Clean, if necessary.
• Check that the fan is working and rotating freely. The
blades shall rotate without any resistance and this can
be checked at voltage free state.
• Check the real time clock and adjust if necessary.
In case of a fault or if a fault can not be reset, see Chapter
11 "Trouble shooting" .
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