Power supply problem

[captain harlock]

Hi, it has been a while.:M: I would like to have some help from you people. I'm using the futaba cdr5000 charger and that beast needs a power supply, however, the power supply that I've bought has been damaged because of exessive heat. I was charging a 12 cell pack at once and the charger can handle up to 36 cells at a time, but during the process the charger suddenly shutt down. I thought that the CHARGER itself was damaged, but when I connected it to a 10 cell pack the thing hooked up in no time, I then reconnected it to the power supply, but no use the thing simply doesn't want deliver any power. I noticed that when I connected a 12v cooling fan to the power supply after the incedent the thing was working quite well, but not with the CDR 5000. So what do you think? what shall I do? the power supply delivers 13.8 volts at 17 amps surge and 15 cont. BUT it has no cooling fan?!!

[RC-Monster Mike]

i would look for a blown fuse in the pwer supply. Some of them have a fuse that may blow if it gets overloaded and replacing it will fix the power supply. Just a guess, but it is worth looking into. What power supply are you using?

[Serum]

I did a rebuild on a powersupply from a computer. (ATX) If you need the layout on the pins, you need to connect to work it out, just let me know.

It can deliver a massive 15A on 12 volts.

It's cheap and stable.

[captain harlock]

Originally posted by Serum
I did a rebuild on a powersupply from a computer. (ATX) If you need the layout on the pins, you need to connect to work it out, just let me know.

It can deliver a massive 15A on 12 volts.

It's cheap and stable.

I'll go for it since mine is already damaged. The circuit is in real bad condition.

[Serum]

Okay, here is the thing;

When you do this, you must know what you are doing, it is completely for you own risk; i pressume that you know how to solder, and you know about safety issues with high power electrics;

connect pin 14 to the ground


I used 6 of the ground wires and 6 of the 12V wires to connect to the chassis mounted connectors, show on this picture.



I also put a 10 ohm resistor (metal case, 20W) on the 12V line out, in order to give the powersupply a load when it hasn't got a load.. (bad for these kind of powersupplies)

[captain harlock]

Originally posted by Serum
Okay, here is the thing;

When you do this, you must know what you are doing, it is completely for you own risk; i pressume that you know how to solder, and you know about safety issues with high power electrics;

connect pin 14 to the ground


I used 6 of the ground wires and 6 of the 12V wires to connect to the chassis mounted connectors, show on this picture.



I also put a 10 ohm resistor (metal case, 20W) on the 12V line out, in order to give the powersupply a load when it hasn't got a load.. (bad for these kind of powersupplies)

Hey SERUM, befor I get the power supply I would like to know if I can charge my 12 cells pack at once without having any problem with the P.Supply, because some says that a 12v power supply will be fried if it is used to power up a charger that can charge a 14.4 volts pack. Its really strang you know, the CDR 5000 only needs between 11-15 volts to be hooked up and charging a pack of 6-36 cells. Futaba even said in the manual that its going to be a big trouble if the charger is supported by a 24v P.S. and remember if you are going to charge a 24 cells at once you will have a 28.8 pack to be charged and you cant use a P.S. that provides more than 15v?!! I'm reeeeaaaally puzzled and I do want some explaination from every one if possible.:C:

[Serum]

Your charger has got his own build in power supply, it can make 40-50 volts from the 12 volts it gets.

if you want to charge 24 cells at 4A, you need a 24X1.2X4A=115.2W power supply, of your supply can deliver 15A on 12V, it is a 12X15=180W...

Get it?

[captain harlock]

Hi there everyone, M.MIKE, SERUM, RCCARNUT and all of the forum's members. I wasn't able to run my t4 since my power supply died and till that day I am not sure of the power of the 9918/1930 motor setup so I would like to know how to use the PC power supply, what wires am I supposed to use? there are some green wires, black wires, red wires , yellow wires... I think I should join the blacks together and the reds to gether and seal the others. Is that the way???

[Serum]

For 5 volt, you can take the red wires..

If you need 12V, use the yellow wires.. ;)

Look at the diagram i posted before, to start the ATX powersupply connect pin 14 to the ground. And make sure that you use a load on that powersupply. (these types of powersupplies don't like being unloaded) i used a 15 ohm resistor inside the powersupply to give it some load when the batteries are full. (placed it in the airflow of the fan, its a metall case resistor)

Join about 6-8 wires together.