Drive Unit for Tunze 6055

[DiscusHeckel]

Hi Roger,

The white propeller in the drive unit of one of my Tunze 6055 pumps seems to be loose in the sense that it rotates and is not fixed to the unit. Does this lead to any drop in the performance of the pump? Should I replace it?

regards

 

[rvitko]

If it turns about 270 degrees and stops this is normal for a 6055 drive unit made before Feb 2008. It does result in more noise, changing it would make it quieter. The reason these drive units have play is that in the non electronic pumps like 6015, 6025, 6045, indeed most standard synchronous pumps, the magnet has to get a head start before it can handle the added resistance of an impeller or propeller. The 6055 and other electronic pumps can compensate electronically to get the unit spinning.

 

[DiscusHeckel]

If it turns about 270 degrees and stops this is normal for a 6055 drive unit made before Feb 2008. It does result in more noise, changing it would make it quieter. The reason these drive units have play is that in the non electronic pumps like 6015, 6025, 6045, indeed most standard synchronous pumps, the magnet has to get a head start before it can handle the added resistance of an impeller or propeller. The 6055 and other electronic pumps can compensate electronically to get the unit spinning.

Thanks Roger.

Yes, it turns about 270 degree and stops. The pump runs silently though.

May I ask another question please?

I use a Tunze 7095 multi controller to control three Tunze 6055 pumps. I like to run my pumps in Sequential and Interval 2 modes from time to time. Unfortunately, all the pumps make a "click" noise when their turn come to start pumping. This noise startles fish, which may inevitably stress them.

Is there any way of addressing this problem.

Regards

 

[rvitko]

This click noise is what I was referring to, the click has two sources, this freeplay and the space between the disk and drive unit, when the pump starts the drive unit slaps down on the disk and causes this noise. A new 6055.740 disk and new 6055.700 drive unit will greatly reduce it. The newer 7092 and 7096 controllers also employ a 0-10% ramp up that lasts a fraction of a second to ease the magnet down, but the drive and disk change alone will eliminate 80% of that noise. Just be sure to remove the old disk before installing the new one, a tool like our 0220.707 is the best way to do this, just hook it and pull it out.

 

[DiscusHeckel]

Thanks again.

My other two drive units' propellers do not move, but they still make the same "click" noise in Sequential and Interval 2 modes. I guess that the cause of the noise must be due to the space between the disk and drive units.

 

[rvitko]

Yes, part of the click is the slap of the prop after the 270 degree turn and part is the magnet coming down against the disk, the new disk is taller (less space) and has a silicon cup under it (shock absorber), the new disks came out in Aug 2010.