mariusmeyer
New member
I bought some 6105 pumps early last year (2011). They are the ones with the removable shaft. I run them on a 7096 controller on pulse mode with a setting of 0% as minimum and around 50% or more. Pumps are dead silent which is great.
Recently the one pump failed and the local agent quickly sent me a replacement motorblock. The motorblock he sent is the new one with the built in shaft. I used the impeller as well as the silence clamp and front housing of the old pump. When I installed the pump using the same settings as the old one I noticed that it is making a knocking sound every time it pulses. The sound is caused by the impeller jumping back when power is applied and I would imagine it is hitting the attenuation disk at the back of the motorblock housing.
I notified the local agent again and he contacted Tunze in Europe who said that they know of such a problem and they should just replace the pump again. So I got a new motorblock and the same knocking sound happens.
If I use 30% as a minimum starting point then it is quiet, so it only happens if I have 0% as a starting point.
So the question is, could this knocking sound be caused by me using the impeller, silence clamp and front housing of the old pump? I was told that none of these changed when they brought out the motorblock with built in impeller shaft.
Recently the one pump failed and the local agent quickly sent me a replacement motorblock. The motorblock he sent is the new one with the built in shaft. I used the impeller as well as the silence clamp and front housing of the old pump. When I installed the pump using the same settings as the old one I noticed that it is making a knocking sound every time it pulses. The sound is caused by the impeller jumping back when power is applied and I would imagine it is hitting the attenuation disk at the back of the motorblock housing.
I notified the local agent again and he contacted Tunze in Europe who said that they know of such a problem and they should just replace the pump again. So I got a new motorblock and the same knocking sound happens.
If I use 30% as a minimum starting point then it is quiet, so it only happens if I have 0% as a starting point.
So the question is, could this knocking sound be caused by me using the impeller, silence clamp and front housing of the old pump? I was told that none of these changed when they brought out the motorblock with built in impeller shaft.
