Some of you were following the long thread regarding the Seio controller and using it with other pumps besides Seio.
I had hooked up a Tunze Nano 6025 to this controller along with a Hydor Koralia 4. Early observations was that both these pumps were working fine with the controller. Well, it's been a few days now and the results with the Tunze aren't as they initially seemed. When the controller switches to low speed, on occassion the Tunze Nano will become noisy. It appears to be some type of cavitation of the propellar on the Tunze, only on low speed and only sometimes. The Tunze prop does not revolve around a full length shaft. I believe that the prop spins with a slight wobble when the controller slows to 50%. It's just enough of a wobble for the propeller to rub up against the sides of that inside "tube" . I also think that it only occurs when there is a higher demand for electricity and the supply voltage to the house drops some. Where I live, when AC demand is high the voltage can drop below 110 volts (seen it as low as 107). I'm not an electrician or electrical engineer so I don't know for sure if this is what causes the issue but I think it would make sense. Its getting hotter by the day (Florida) and AC demand is definitely climbing now. I notice the issue mainly mid afternoon and early evening, never in the morning or late at night.
A full length shaft would probably solve the issue, the Koralia doesn't have the same problem and it's prop runs on a full length shaft, the Nano does not. It's also the same on 2 different 6025's, so it's not a faulty or finicky pump.
If anyone else decided to try their nano's on the Seio controller, I'd love to hear your experience. I have a feeling that not everyone will have this issue. The power grid here, or whatever you call it, is lacking and I really do believe that the voltage drop is the issue.
I had hooked up a Tunze Nano 6025 to this controller along with a Hydor Koralia 4. Early observations was that both these pumps were working fine with the controller. Well, it's been a few days now and the results with the Tunze aren't as they initially seemed. When the controller switches to low speed, on occassion the Tunze Nano will become noisy. It appears to be some type of cavitation of the propellar on the Tunze, only on low speed and only sometimes. The Tunze prop does not revolve around a full length shaft. I believe that the prop spins with a slight wobble when the controller slows to 50%. It's just enough of a wobble for the propeller to rub up against the sides of that inside "tube" . I also think that it only occurs when there is a higher demand for electricity and the supply voltage to the house drops some. Where I live, when AC demand is high the voltage can drop below 110 volts (seen it as low as 107). I'm not an electrician or electrical engineer so I don't know for sure if this is what causes the issue but I think it would make sense. Its getting hotter by the day (Florida) and AC demand is definitely climbing now. I notice the issue mainly mid afternoon and early evening, never in the morning or late at night.
A full length shaft would probably solve the issue, the Koralia doesn't have the same problem and it's prop runs on a full length shaft, the Nano does not. It's also the same on 2 different 6025's, so it's not a faulty or finicky pump.
If anyone else decided to try their nano's on the Seio controller, I'd love to hear your experience. I have a feeling that not everyone will have this issue. The power grid here, or whatever you call it, is lacking and I really do believe that the voltage drop is the issue.