Hvad er differencen mellem en VSD- (variabelt hastighedsdrev) og en VFD- (variabelt frekvensdrev) vakuumpumpe?
What is the difference between a variable speed drive (VSD) and a variable frequency drive (VFD) vacuum pump?
Der er stort set ingen. Det er bare to ord for det samme. VSD fremgår af resultatet, at vakuumpumpens forskellige rotationshastigheder, VFD, på den anden side står for årsagen til de forskellige hastigheder, nemlig den varierende frekvens.
There is no difference. They are just two terms for the same thing. VSD describes the result: the different rotational speeds of the vacuum pump. VFD, on the other hand, stands for the cause of the different speeds, namely the variable frequency.