View Full Version : Iwaki RD-30 owners: Some questions...
I've got some questions for all you Iwaki RD-30 owners out there.
First, can the barbs on the RD-30 be changed, or are they permanently affixed like the ones on the stock MCP655?
Second, is your pump the American or Japanese version?
Third, is it a 24v or 12v model, and if 24v, how do you power it? How do you make it turn on and off automatically with your computer?
Fourth, where did you get your RD-30 and how much did you pay?
Thanks!
nikhsub1
08-07-2008, 10:11 PM
1. The barbs are fixed and can not be altered.
2. The RD is only Japanese, it is not like the WMD (American) and MD (Japanese) pumps.
3. RD series are typically 24v. You need a 24v PSU to power it, a meanwell S150-24 fits the bill perfectly. I bought 3 (yes three) about 4 years ago off ebay brand new for $200 (for all 3).
I thought I heard somewhere that the RD-30 can be either Japanese or American, and that the Japanese was better. That is false, all RD-XX pumps are Japanese?
If you power it with a separate PSU, do you run it at full power? I've heard you can undervolt them. Is that a good idea?
And how would you make it automatically turn off and on in conjunction with your PC?
nikhsub1
08-07-2008, 10:25 PM
No. RD's are Japanese only. You heard false. The meanwell 24v psu's have a pot you can adjust the voltage with, typically +/- 10% but usually more. Sweet spot on these pumps is ~18v or so. You will not harm the pump by undervolting it. Its kinda like downclocking a CPU. When I ran the RD I used a relay to turn the meanwell on and off...
Ok thanks for the info. Would a relay like this work pretty easily:
http://www.sidewindercomputers.com/pureswkitv3.html
FuriousSalesman
08-07-2008, 11:01 PM
Nikhsub covered just about everything. I got mine at JabTech for $220. Just keep in mind the space this setup will take.
Ok, space isn't an issue. In addition to knowing whether or not the relay I linked to will work, I have a question about that meanwell power supply.
Nikhsub you said that the sweet spot for voltage on the RD-30 is 18V. But on the PSU you selected, on the manufacturers data sheet, it says it is adjustable from 21-28v, so how would 18v work?
FuriousSalesman
08-07-2008, 11:03 PM
Yes that will work. I have the V2 version of that relay kit. However, how do you plan on mounting the power plug?
Not sure what I would do, just would see how big everything is and make a plan once I have everything on hand. Would there be any particular issue with mounting the plug?
About how much bigger is the RD-30 than say an MCP655? From the pics, it looks about the same, no?
Finally what about the power supply? Where can I get a good quality power supply with adjustable voltage, say 15-28 or so range, that will be able to also supply enough wattage to the RD-30?
n00b 0f l337
08-07-2008, 11:10 PM
I'd say purchase a Meanwell that runs at 18V actually, that is a standard voltage, and they are cheap on ebay.
Hey, since an Iwaki RD-30 pump consumes 76W at full tilt running at 24v, wouldn't I be able to use a less powerful (cheaper and smaller) Mean Well power supply, such as a 100w or even 75w model?
I am liking the Mean Well CLG-100-20 very much. Fits the bill perfectly for voltage, perfect power rating, very high reliability, water proof, etc.. And its a perfect size to mount inside my case on the roof.
XS_RoB
08-08-2008, 04:56 AM
From what I have read - it is the start up power that is needed "technically" that is the killer and why a mac daddy Meanwell is needed. But I have never heard of one failing on a 150-24v. I will try to find the link - so I can get you the starting power draw on the Iwaki......
I have 2 and love them! - I use a remote control to start my water cooling system. Just have to remember to turn it on before the PC! - the killer benefit is that the Water Cooler can run for a little while after my PC is off.....
Enjoy and Go All Out! You only Live Once!
nikhsub1
08-08-2008, 07:32 AM
Hey, since an Iwaki RD-30 pump consumes 76W at full tilt running at 24v, wouldn't I be able to use a less powerful (cheaper and smaller) Mean Well power supply, such as a 100w or even 75w model?
I am liking the Mean Well CLG-100-20 very much. Fits the bill perfectly for voltage, perfect power rating, very high reliability, water proof, etc.. And its a perfect size to mount inside my case on the roof.
XS_Rob is correct, the RD-30 spec sheet says the pump needs 10A at startup which is 240W... however, this seems to be a way over blown estimate as they do run fine on the 150W units and I think some even use 125w units. I was the first person with an RD-30, I even called Iwaki about this 10a startup requirement and they said that is what it needs... so I got an S-240-24 PSU which is way more than I need... My 24v psu will go down to 17v, maybe I got a freak PSU but that is what it will do.
I see... is there any potential for shortening the pump life if you start it with less than 240W?
NaeKuh
08-08-2008, 10:44 AM
I see... is there any potential for shortening the pump life if you start it with less than 240W?
i think the concern was the startup.
the pump needs more voltage at startup then operation which is why the 10A requirement is there. Supposidely if you didnt have this amperage, the pump wouldnt/shouldnt start.
However i run a S150-24 and havent had any issues with startup or anything.
nikhsub1
08-08-2008, 11:23 AM
I see... is there any potential for shortening the pump life if you start it with less than 240W?
Not at all... the pump will either start or it won't. If it doesn't have enough amps at startup it just wont start, end of story but this has no relationship to the lifespan of the pump.
Do some RD-30s require more/less power to start than others (luck of the draw), or are they all pretty much guaranteed to start on ~150W?
Finally, if I get a switching power supply such as the Mean Well CLG-150-20, can I set it's output voltage with no load connected and measure it with a DMM? The output voltage won't drop with a load connected due to the fact that it's switching, correct?