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58 SB12-17-IA-nl-52 Installatiehandleiding
9.3.2 Werking van de varistoren controleren
Varistoren zijn onderhevig aan slijtage. De werking van de varistoren wordt door veroudering of door
herhaaldelijke belasting door overspanningen gereduceerd. Daarom is het mogelijk dat een van de
thermisch bewaakte varistoren zijn beschermingsfunctie verloren heeft en dat de rode LED als gevolg
daarvan brandt.
Controleer de functie van de varistoren als volgt:
1. Open de omvormer zoals in hoofdstuk 7.2”Omvormer openen” (Pagina44) beschreven.
2. Stel bij beide varistoren in gemonteerde toestand
met behulp van een multimeter vast of tussen de
aansluitingen B en C een geleidende verbinding
aanwezig is.
Positie van de varistoren
De positie van de varistoren kunt u met behulp van de onderstaande afbeelding bepalen.
Hierbij op de volgende indeling van de
klemmen letten:
Klem A: buitenste klem
(varistoraansluiting met lus [ril])
Klem B: middelste klem
Klem C: buitenste klem
(varistoraansluiting zonder lus [ril]).
Resultaat Maatregel
☑Er is een geleidende verbinding
aanwezig.
Er treedt vermoedelijk een andere fout op in de
omvormer.
•Neem contact op met de SMA Serviceline(zie
hoofdstuk 13”Contact” (Pagina69)).
58


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