click, click

[ostrow]

Roger:

I know you have said and posted several times that the Streams may click if used in a quick pulse, say with an Apex controller.

What causes this? My 6205 doesn't, nor does one of my 6105s, but one 6105 does, and on every pulse.

If there is a cause, maybe there is a solution?
Thanks,
Joel

 

[dahenley]

do you pulse from 0%-100% or 30%-100%?

(just a side note, i have heard that a air pocket from behind the impeller will push it forward. so you might take apart the pump, submerge it, and re-assemble it in your tank. that way there is nothing caught behind it. then give it a try)

 

[ostrow]

Yeah, 0-100, when they are in that mode all 3 do, but only one clicks. I'm doubtful on the air pocket. Wouldn't that go away pretty quickly?

 

[dahenley]

0-100 is bad for tunze pumps. You should change to pulse to 30%-100% you will get as much if not more wave,without hurting the pump.
That will also prevent the pump from starting backwards or popping the front grill also.
Give it a try. (I have mine on 30-100 and produces a nice wave with a single pump in my 8' tank. )

The air might not escape due to tolerance and the position or pointing of the pump.

 

[ostrow]

hmmm. I'd heard it wasn't bad for them. I read a lot on it.

Roger, is this true?

 

[dahenley]

Did you do your research here or in the Neptune/DA forum? (just curious?) i dont think it is mentioned in those forums.


I only know this because i play on the computer too much and stock the Tunze forum... haha
but here are a few
(maybe Roger will drop in later)

The possible speeds are 0% (off) and 30-100%, 1-29% will damage the pump as there is not enough cooling flow and the rotation is unstable.

I think it is just a break in issue and you should be fine now. My guess is some air trapped in the pump caused the rotor to come forward and bind.

from
http://www.reefcentral.com/forums/showthread.php?t=1991410&page=5

The power should not dip below 30%, at these low speeds two things happen, the prop assembly becomes like a gyroscope that is slowing and unstable and it wobbles and makes noise. Also, the pumping rate is too low to sufficiently cool the motor and can cause an overheat.

from
http://www.reefcentral.com/forums/showthread.php?t=2082010

 

[ostrow]

I never saw those. Ok. Well, bye-bye cool wave. It's nowhere near what it was. Thx.

But the click is gone....

 

[RoscoPColtrane]

I think you may be incorrect. These pumps are designed to pulse, 0-100% being one of the options. Running a pump continuously at any power below 30% is bad, the split second it takes to go from 0-100 should not harm your pump. This is my interpretation, I am sure Roger will provide info.

 

[dahenley]

Roscoe, the quotes from above are from Roger.
Ostrow:
You may have to change the timing on the pulse to bringit back where you want it.

 

[ostrow]

Oh, brother. Now I have to fiddle with the pulse again? Not fun.

 

[rvitko]

0-100 (off and on) is not bad for the pumps, the problem speeds are 1-29% of power off is fine and so is the range of 30-100%. 1-29% is bad because the pump is not spinning fast enough for the propeller to be balanced (gyroscope effect) and it is not pumping enough to cool itself relative to the power consumed.

The problems with off and on use is the pumps need more frequent cleaning, if you keep up with them it does not harm them. They may also click, this is more pronounced on older pumps pre silence clamp and anti attenuation disk and also on pumps in the first week or 2 of use while the drive unit may still be stiff. The 7092 and 7096 with software update reduce this click further by adding a ramp power so it quickly (less than .05 second) goes from 0-10% power before jumping to 100%, this eases the rotor down and into rotation.

The cause of the click is the drive unit being pulled back as the electromagnetic field energizes, this causes it to slap back harshly on the base of the pump, the anti attenuation disk 3005.740 reduces the noise of this by adding a shock absorbing silicon cup, with the ramp effect of the newer controllers it is almost eliminated.

 

[ostrow]

Roger: hm. Well, my 6105 that is clicking has the silence clamp and the newest impeller. Well, I better check now.

But thanks for confirming what I was sure I had read, that 0-100 is ok for the pump.

If I lack the disk or the newest clamp, well not sure why I would ... except one that you had replaced, the clamp, snapped/cracked when I put it on if I remember correctly. Hm, I'll look when I get home. But I thought I had all the newest on these pumps ... purchased in Jan '10.

 

[rvitko]

The clamp and disk were improvements made in July 2010. The new clamp is 6065.600, this reduces the transmission of noise to the glass. The new drive unit is 6105.700 (same as old) but includes now a titanium grade 2 shaft, blue propeller blade and new disk 3005.740.

 

[dahenley]

Wow... i guess i was mistaken...
Apologies are due to both of you.
Thanks for clearing that up Roger.

 

[rvitko]

No worries, early on we advised against it strongly due to the clicking, which does no harm, but is annoying, fortunately it is something we found a technical fix for.