Here's a photo of the bottom of the 8up/dual SCW PcB with more details of the fan control connections. Let me know if you have any questions.
Meanwell LDD driver: for those who want to dim to 0 using Arduino
- Thread starter pwreef
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Here's a photo of the bottom of the 8up/dual SCW PcB with more details of the fan control connections. Let me know if you have any questions.
_shorty_
New member
Thanks O2. That is helpful, but I'm still missing something though. So that 3-pin section (with ground, PWM 2&3 wire, and PWM 4 wire): are those dip switches or terminals?
And screw terminals 4 - 8 on the front are used for what? (Since 4 is labeled PWM for 4 wire fans only).
What is the difference in 3wire fans vs 4wire? Do 4 wire fans actually accept a direct PWM signal?
And screw terminals 4 - 8 on the front are used for what? (Since 4 is labeled PWM for 4 wire fans only).
What is the difference in 3wire fans vs 4wire? Do 4 wire fans actually accept a direct PWM signal?
_shorty_
New member
LOL!, wow.. dugh.. I read 'fan connection pin assignments' before I realized there were 4 x 4-pin pinouts underneath for the fans and then kept in my mind that your pin 1-4 labels correlated to the screw terminals even after I realized there were more pins. I guess I forgot the ultimate purpose of this board too.. lol. It probably didn't help that had a couple last night while looking through this information.. :beer:
no wonder I was confused... Between this and my Celcius/Farenheiht mixup, you are probably thinking 'this guy should not be DIYing anything'.... lol you may be right.
OKAY.. So for 3 wire fan - is the third wire 'yellow/TACH' and unused, and these fans are basically treated as 2 wire?
What's max voltage into the SCWs?
You're right! They're not all the same. It pays to be cautious and verify the wiring scheme of any suspect fan before plugging it in. LOL (don't ask.... I learned & relearned this valuable lesson on more than one occasion.)
I need to find a "magic smoke" emoticon. LOL.
I think mine are too, but (Insert crude William Shatner as "Captain James T. Kirk" impersonation here)LOL
I.......can't.........log......in.....to........my..........Digi........Key..........account..... right.......now.......:facepalm:
LOL- I set my order up to remain active even if the chips remained on back order for up to a year. Trouble is- I can't remember what other items I have tied to the same order. It's gonna be like Christmas in March! I can't wait to see what goodies I'm gonna get!
Hi 02Surplus could you please PM me when you get a chance. If I could reply to that? I tried to Pm you but was told I needed 10 posts been member sence 2007 so im not a BOT just a really bad speller so I don't post much on here but enjoy reading and learning. dident mean but in been reading about your A6211s.
If you're unable to respond to my PM. Try posing your question over here-http://reefcentral.com/forums/showthread.php?t=2310459&page=11
It's a more appropriate thread and will help with your post count LOL.:dance:
Actually- that feature is only found on the 8up with dual SCW convertors. I designed it that way for "Rott"'s use. He needed to be able to power his more powerful A6211 drivers from two separate power supplies, since his current requirement for only 4 channels was almost 6,000ma and that amount of current nearly exceeded the current capacity of one of his power supplies. The board features two isolated positive voltage inputs and a common ground connection. One of the positive inputs feeds channels 1 - 4 and the other feeds channels 5 - 8. Each of the positive inputs are rated to handle up to 9,000ma for a total of 18,000ma per board. For users that don't need to configure the board for two power supplies, the two positive inputs can be soldered together at the bottom of the Pcb, allowing all 8 channels to be powered from only one power supply.
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