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LOGO!-Handboek
A5E00129033-01
222
8.7.1 Eisen die aan de besturing van een pomp voor
gebruikswater worden gesteld
S Er moet steeds gebruikswater ter beschikking staan. In
geval vannood moet de besturing automatisch op drink-
water omschakelen.
S Bij het overschakelen op drinkwater mag geen regenwa-
ter in de drinkwaterleidingen terecht komen.
S Als er te weinig water in de regenwatervergaarbak is,
mag het niet mogelijk zijn om de pomp in te schakelen
(beveiliging tegen drooglopen).
8.7.2 De tot dusver gebruikte oplossing
K1 K2
K3
pomp uitlooptijd
S1
K3
S4 K3
droogloop-
beveiliging
hulpstroomkring
L1
N
K4
S3 K4
drinkwater-
toevoer
p<
K2
S3 S2
Y1
De besturing van de pomp en van een magneetventiel ge-
beurt via een drukschakelaar en 3 vlotterschakelaars, die in
de vergaarbak voor het regenwater zijn aangebracht. De
pomp moet worden ingeschakeld als de minimumdruk in de
ketel niet wordt bereikt. Nadat de werkdruk is bereikt, wordt
de pomp na een uitlooptijd van enkele seconden opnieuw
uitgeschakeld. De uitlooptijd verhindert dat de pomp voort-
durend wordt in- en uitgeschakeld als gedurende langere
tijd water wordt afgetapt.
Toepassingen
232


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