Hong Kong wave maker on eBay

Fish street has some interesting items however for the electrical devices, note that they are rated at 240V @ 50Hz, not the US standard of 120 @ 60Hz
 
Regarding the wave maker,
"Voltage 110 / 220 - 240 50Hz
Power 24V 50W Output "

So that's 110 volts AC at 50 cycles. The cyclic rate of a motor makes no difference one way or the other since almost all of our US motors are 50 / 60 Hz ( cycles ).

At the sametime, I agree some of their things ( like the powerheads and fans ) indicate 240 volt and the controller has what looks like a 240v socket.

crazy stuff though! :shock:
 
resun is another maker of asian tunze knockoffs...to bad shipping is so expensive
 
@kuyatwo wrote:
resun is another maker of asian tunze knockoffs...to bad shipping is so expensive said:
they do say bulk buyer discounts available, perhaps a GB ?

And FYI things that derive their timing from the AC like clocks will run faster with 60hz if designed for 50hz .
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@rckrzy1 wrote:
[I]@kuyatwo wrote:[/I][quote="resun is another maker of asian tunze knockoffs...to bad shipping is so expensive said:
they do say bulk buyer discounts available, perhaps a GB ?

And FYI things that derive their timing from the AC like clocks will run faster with 60hz if designed for 50hz ."]

Yep,
I agree Adam. I should have been more specific when talking about motors. In the case of a pump, {standard electro-mechanical motor}, 50 Hz should make no difference other than possibly running 10 cycles per second slower. Correction.. ( faster ).. Thanks Frank!
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Hard to tell from the info provided - but there is a reference to 24VDC Output. If the pump is a wall-wort fed 24V unit, 50/60 Hz has little effect on the transformer.

Voltage 110 / 220 - 240 50Hz
Power 24V 50W Output

In a 60Hz circuit, a motor designed for 50Hz will run faster. As long as the load has not issue with the speed increase, this is not be a problem.

Do note that single-phase motors with capacitor start and/or capacitor run [CAN] have problems with the change of rotational speed.

Single phase power does not have a rotational aspect like 3-phase (phases are 120 degrees apart).

An additional start winding is added to create this rotational starting torque.

The start winding is powered during initial start and a centrifugal switch mounted on the motor's shaft will open at some set speed shutting down the start winding.

A 60Hz motor used on 50Hz (runs slower) may not open the centrifugal switch - usually burns the motor out pretty quickly.

A 50Hz motor used in 60Hz may turn off the start winding too soon for the motor to make the transition to running (the motor will burst up to speed quickly but does not have a stable rotation rate - so the switch will open at speed but the mtor hasn't really transitioned to running mode).
 
I am not interested in one but has anyone reviewed any of these products maybe on RC or something.
 
@fperkins wrote:
Hard to tell from the info provided - but there is a reference to 24VDC Output. If the pump is a wall-wort fed 24V unit said:
Frank, the 50 / 60 Hz issue doesn't apply to the powerhead's like we normally use at 110 volt AC, as they do not use a centrifugal switch, correct? Which would make this mute, correct?

BUTT... with that said.... The transformer used on the 240v AC to 24v DC could be replaced with a 110v AC to 24v Dc and all is well in Wellsville!

Ideas?
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Mike,

I don't beleve the powerheads used capacitor start - but given the load I would think not.

These are probably shaded pole motors and the 50 - 60 Hz is moot.

I posted only to note switching motors between feeds can be an issue. Should have continued with a statement that only a few of the motors used in this hobby will be an issue (many of the external large pump motors are cap start).

And, yes, if the pump unit is actually fed DC, you could replace the wall-wort -- but it seems they are providing a unit that can handle whatever feed it gets (most laptop computers have multi-voltage power bricks now - sometimes you have to flip a switch (older Toshiba was like this) - other times the unit is just built ready to handle both (kind of inefficeint and results in more wasted heat, but it works)).
 
Here's one where a guy has been running the wave maker for over a year with no issues and it cam e ready for 110v

http://reefcentral.com/forums/showthread.php?s=&threadid=1410780&highlight=resun
 
Sounds ready for 110 - even if not ready for 60 Hz.


Actually I was disappointed when I cam into this thread. When I saw the thread I thought of Godzilla. Kind of a let down to find it was only about a wave maker. :lol:


Don't remember who presented it ( Joshi, Shimek ) but they used a 15 G tall tank bottom-drilled for a toilet flush mechanism.

The float mechanism that normally shuts off water flow was attached to the flapper.

Position the tank above the display tank. Plumb to a PVC manifold in the center of the tank just under the display's water level (wave goes in both directions).

Pump water into the tank and when the float rises sufficiently it opens the flapper.

Water streams into the display, flapper closes, fills, opens, fills, opens.

Seemed like a cheap way to build one of these.
 
Carlson surge device, perhaps, Frank? http://www.breedersregistry.org/Reprints/MFM/v11_aug96/simple_surge.htm

Or the Bourneman one using a flapper..
http://www.petsforum.com/personal/trevor-jones/surge_device.html
 
@Ashlar wrote:
Or the Bourneman one using a flapper. said:
Closer to this one - but it used a tall aquarium as the holding tank. Looked interesting.

@rckrzy1 wrote:
But who wants a toilet on top of their reef tank ? said:
It's probably ok to hide it, or not - depends on your personal taste I guess. I don't know if who wants one or not (sorry, only thing A & C did that was even remotely funny).
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They're interesting but I agree with Adam that they would be too ugly, really, in the overall look of a system--at least a display system. I would think for practical purposes that they would work well with a frag system or farm system where it's overall look doesn't really matter. I know Robert Tondre experimented with one at one point, before he built his fish room.
 
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