The Koolance CTR-SPD24 is a new 24 Volt speed controller which will take your ordinary 12V power supply and allow you feed and control a pump or fan from 10 volts to 24 Volts. This is really exciting because previous to this, 24V or higher voltage was typically only possible with a separate dedicated power supply. In addition, the controller is ideal in controller the new stronger PMP-450S pumps. So unlike your typical fan controller which is either PWM or resistance based (Can only reduce voltage), this one can got both directions.
Before going too far, I would like to thank Tim from Koolance.com for supplying two of these units that I have been using for my PMP-450S performance and noise testing. Thanks!
Here are some pictures showing the box, packaging, and size of the controller:
Minimum and maximum voltage settings
For testing I am including both the minimum and maximum photos of the PMP-450S pump under load using the controller. I fed the controller precisely 12.0V using my test power supply, and then measure the pump voltage at the pump plug for the actual voltage provided.
To determine the efficiency of the controller I measure the amperage and voltage fed to the combined pump plus controller, then did the same for just the pump. Using these two sets of data I was able to determine the energy lost through the controller. Here are those results:
It turns out the controller is very efficient at over 89%, so the heat-sink and controller is wasting up to about 5 watts at a 48 watt consumption level. I did also measure the heat-sink with a laser thermometer and it does get warm/hot to the touch. I measured roughly 45C in a 25C ambient which is warm, but not that hot. I have actually measured some pumps measuring upwards of 60C, so 45C seems to be relatively good.
What good is 24V you might ask?
It’s what the “STRONG” or PMP-450S NEEDS for full out pumping performance. The PMP-450S with this controller will easily outperform the most powerfull PMP-450/DDC pump. It also serves as a “Vario” feature for the PMP-450S because that pump does not come with a variable speed knob. Basically, the PMP450S and this speed controller should go as a pair for full pump performance. Here is how the “STRONG” compares to the PMP-400 with top, and I haven’t even completed testing with a top on it. It is simply one of the most powerful pumps you can buy at that price point.
I also know of a few people that have 24V fans and there are other needs I’m sure. I would not suggest the controller for the regular PMP-450 pump though as the performance gain on that pump model is fairly minimal. The pump that needs this is the PMP-450S, she likes the extra volts!!..
I really like this controller, particularly for it’s compact size, simple analog control, and extra legs it gives to the PMP-450S model pumps. I could see this controller also coming in handy for other 24V needs, no more need to have a separate dedicated power supply for high voltage, this fits that need nicely at a good price. I really could not find any faults in this controller, it’s a nice compact unit and has plenty of power for one PMP-450S. It would even have enough power to feed two PMP-450S pumps at lower voltages/lower flow rates. I will be using these for a variety of 24V testing needs in the future, extremely nice!!
Update 7/27/11 Connector Photo
This is how you connect up a molex connector type pump like the PMP-450S: