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11. MaintenanceIn general the softstarter is maintenance-free. There arehowever some things which should be checked regularly. Inparticular, if the surroundings are dusty the unit should becleaned regularly.WARNING! Do not touch parts inside theenclosure of the unit when the control supplyvoltage or the mains supply voltage isswitched on.11.1 Regular maintenance• Check that nothing in the softstarter has been damagedby vibration (loose screws or connections).• Check external wiring, connections and control signals.Tighten terminal screws and busbar bolts if necessary.• Check that printed circuit boards, thyristors and coolingfins are free from dust. Clean with compressed air if necessary.Make sure the printed circuit boards and the thyristorsare undamaged.• Check for signs of overheating (changes in colour onprinted circuit boards, oxidation of solder points etc.).Check that the temperature is within permissible limits.• Check that the cooling fan(s) permit free air flow. Cleanany external air filters if necessary.<strong>Emotron</strong> AB 01-4135-01r2 Maintenance 105
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