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Old Aug 31, 2010, 09:47 PM
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Guys I tried putting some capacitors in parallel with the PL8 to prevent the "Limiting - Supply Noise" message. I first tried a 2200uF 63v capacitor with no success. I then tried a 10,000uF 25v capacitor (largest they had) and still got the "Limiting - Supply Noise" message, but I was able to charge at 38a approx. 9amps each 6s pack (I'm charging two 6s 5000 with the safe parallel adapters). So some success. I did have the charger cut out once with the message "Low Limit" but I lowered my min voltage to 10v and it was fine. I am going to try and get some larger capacitors and see what happens.

Still an odd thing, at no load the PL8 is reading an incoming voltage of 13.06v, when I start the charge the under load voltage is 14.23v. (?) Couple that with the Low Limit message, could the PS actually be varying between below 12v and over 14v? Maybe I have a real problem with the PS.

Once again I really appreciate all the help I'm getting. I not quite there yet in switching over to computer PS's, but I might eventually get there.
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Old Aug 31, 2010, 09:55 PM
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United States, WI, Milwaukee
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Update:

Flew two of my batteries that had the safety code 28 on them after first PL8 charge. Charged them tonight on a modified Generic High Power at 1C Manual along with specifying battery size in mah.

Charged in parallel in 33 minutes. After charging hooked into CCS and still got the Safety Code 28 error. Batteries were right around 3.83/cell after flight.

Guess I will have to lower the voltage on the charge tab. I'll start out at 4.15v and see what happens.

Mike
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Old Sep 01, 2010, 01:57 AM
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Quote:
Originally Posted by SteveM732 View Post
What is the highest current draw from the DLS-55's have you had without experiencing any problems?
So far the highest output from the PL8 was 20 amps into A123 5s3p unbalance. Did not view the current draw from the DLS-55's in series. Will check @ the next charging.
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Old Sep 01, 2010, 02:55 AM
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Quote:
Originally Posted by gww528 View Post
So far the highest output from the PL8 was 20 amps into A123 5s3p unbalance. Did not view the current draw from the DLS-55's in series. Will check @ the next charging.
That is a maximum PL8 output of 365W which is only 16.2A into the PL8 (assuming 80% charger efficiency). Previously drsmith751 reported the trouble happened at about 45A load on the power supply so it may be a moot point for you as the series configuration will give you about 1200W at that point.
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Old Sep 01, 2010, 07:31 AM
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Quote:
I then tried a 10,000uF 25v capacitor (largest they had) and still got the "Limiting - Supply Noise" message, but I was able to charge at 38a approx. 9amps each 6s pack (I'm charging two 6s 5000 with the safe parallel adapters). So some success. I did have the charger cut out once with the message "Low Limit" but I lowered my min voltage to 10v and it was fine.
Great to hear and I assume that charge at 38amp. really means 38 amps. output from the power supply.



Quote:
I not quite there yet in switching over to computer PS's, but I might eventually get there
Believe me I am not trying to convince anyone to switch over server power supplies . The more who make that switch just diminishes the supply and drives the prices up.
I just like others to be aware that you do not have to spend $150 to $400 or more for a hefty power supply if you are operating on limited funds .

Charles
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Old Sep 01, 2010, 07:49 AM
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Quote:
Originally Posted by SteveM732 View Post
That is a maximum PL8 output of 365W which is only 16.2A into the PL8 (assuming 80% charger efficiency). Previously drsmith751 reported the trouble happened at about 45A load on the power supply so it may be a moot point for you as the series configuration will give you about 1200W at that point.

Actually my numbers are more like....

Without the capacitor I get the Supply Noise message at approx 25 amp load, and it max's out at approx 32 amp load (375 watts approx 16 amp output from the PL8)

With a 10,000 uF capacitor I get the Supply Noise message at approx 31 amp load and maxing out around 38 amp load (440w approx 18amp output from PL8).

So the max amps I have been run the DLS-55 is 38 amps with only the PL8.

I did do an experiment where I connected both the PL8 and a 10S charger in parallel with the DLS-55 and was able to pull 45amp load with no error messages. Both chargers only had one pack and were outputing 10a to each pack.

Thanks!!!!
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Old Sep 01, 2010, 10:49 AM
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OK, thanks for the update and clarification. Looks like it is happening at a lower current than I realized.
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Old Sep 01, 2010, 11:43 AM
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Quote:
Originally Posted by wingster View Post
I too have been getting the "supply noise" error. I'm using an Iota DLS 45 charging four 5s 5000 lipos in parallel. Power supply output voltage is about 13.6v. If I charge at 20A total I will sometimes get the error. If I cut back to 19.5 A all is well. If I attach the jumper on the power supply that increases the voltage to 14.5v I can charge up to 21A.
I switched over to Feathermerchants 42A supply today. Charging six 5S 5000mah packs in parallel the PL8 delivered 21.6A @ 19.1v and 20.0A @ 20.6v. I had set the charge rate at 25A but I was limited by the 40A input limit I set on the PL8 in order to protect the power supply. As stated in the quote above I was only able to charge at 19.5-20A using the Iota supply. So as others have concluded it looks like the Iota supply is the issue.

The PL8 read the input voltage of Feathermerchants supply at 12..4v(40.0A). With a multimeter I read 12.22v
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Old Sep 01, 2010, 12:08 PM
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wingster and gww528,

When I connect the DLS-55 to the PL8 my input voltage is around 13.4v and steadily increases to around 14.5v as the load increases. Do your PS show this same increase?

I'm looking to order a 20,000uF and 30,000uF capacitor and see if it smoothes out the voltage. Right now I can charge two pack at 9 amps each which is not to shabby. The packs come out perfectly balenced.

Thanks!!!
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Old Sep 01, 2010, 12:16 PM
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United States, FL, Jacksonville
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Quote:
Originally Posted by drsmith751 View Post
wingster and gww528,

When I connect the DLS-55 to the PL8 my input voltage is around 13.4v and steadily increases to around 14.5v as the load increases. Do your PS show this same increase?

I'm looking to order a 20,000uF and 30,000uF capacitor and see if it smoothes out the voltage. Right now I can charge two pack at 9 amps each which is not to shabby. The packs come out perfectly balenced.

Thanks!!!
I am running two in Series & have them both set for 13.6V. Do you have your's set to 13.6V or 14.2V? You may also want to call Iota. Their techs are very helpful as I have talk to them a few times.
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Old Sep 01, 2010, 12:22 PM
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I'm running 13.6v without the plug.
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Old Sep 01, 2010, 12:28 PM
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Quote:
Originally Posted by drsmith751 View Post
I'm running 13.6v without the plug.
I would think when the load is increased the voltage would go down.
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Old Sep 01, 2010, 02:09 PM
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Austin, TX USA
Joined Mar 2007
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Quote:
Originally Posted by wingster View Post
I switched over to Feathermerchants 42A supply today. Charging six 5S 5000mah packs in parallel the PL8 delivered 21.6A @ 19.1v and 20.0A @ 20.6v. I had set the charge rate at 25A but I was limited by the 40A input limit I set on the PL8 in order to protect the power supply. As stated in the quote above I was only able to charge at 19.5-20A using the Iota supply. So as others have concluded it looks like the Iota supply is the issue.

The PL8 read the input voltage of Feathermerchants supply at 12..4v(40.0A). With a multimeter I read 12.22v
I also use Feathermerchant's 42amp supplies (in series for 24v). They are a very good value. btw, these are also power factor corrected (I believe the IOTA's are not).
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Old Sep 01, 2010, 03:57 PM
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Quote:
Originally Posted by wingster View Post
So as others have concluded it looks like the Iota supply is the issue.
I'm glad I checked back here before ordering another Iota. I have been running three 10s chargers on a DLS-90 and had been considering another one in series for the PL8. It sounds like feathermerchant is the way to go. I already have one of his 42 amp power supplies. Thanks for all the good info.
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Old Sep 01, 2010, 05:57 PM
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I am also running two of feathermerchant's 12v 42a server supplies in series and i get a consistent 24.0 - 24.1 volt reading off of the PL8 and Fluke 26 multimeter. I don't recall a drop in voltage under load. I've only been using this setup for about two weeks but i haven't had a single problem.

Matt
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