Capacitor Mod on Astro pocket turbo 130

[Hobweld]

Originally Posted by GWIZ

You already know that your posted drawing is a bit wrong.

It's ok to tap off the AC side and feed a second bridge, but in your drawing the minus sides are connected to both bridges.
You can not connect the plus or the minus sides of one bridge to the other.

Like this?

Ken

[GWIZ]

Originally Posted by cutter

I didn't think I fully understood what was going on in that drawing but that part bothered me right away.

I really did not look at that rats nest. I concentrated on what he wanted, using one wire for his trigger.

Hobweld will have to confirm the third party rats nest.


This is my best GUESS. see picture

[Hobweld]

Originally Posted by GWIZ

I really did not look at that rats nest. I concentrated on what he wanted, using one wire for his trigger.

Hobweld will have to confirm the third party rats nest.


This is my best GUESS. see picture

GWIZ

Yes, that is correct. The original drawing I downloaded from the cebora website. Thanks so much for the help.

Ken

[GWIZ]

Originally Posted by Hobweld

GWIZ

Yes, that is correct. The original drawing I downloaded from the cebora website. Thanks so much for the help.

Ken

Ooooooook.

Originally Posted by Hobweld

"Actually the motor negative is going to the negative on the bridge, but the way the original diagram is drawn, appears to connect to the positive, maybe I should have redrawn it to show it passing past the positive connection. I didn't draw the original diagram, it was a download from manufacturers website" His words.

Ken

I just don't know what this statement means.

[Hobweld]

Originally Posted by GWIZ

I just don't know what this statement means.

Sorry about that. Most of the info I have posted was from "another" forum, that shall remain nameless.

When I get into this project I shall post pictures and get verification before firing anything up. Safety first.

Ken

[Hobweld]

GWIZ

Ok, I looked on digikey for a relay and all I can say is my head hurts. Could you point me in the right direction?

Ken

[DrBob]

Originally Posted by Hobweld

DrBob
I appreciate the added input. The main reason was to get a little more punch to help wet out the puddle better.

Pic 1 from this.....

Pic 2 to this.

Hobby, I don't know how much welding you've done or do so I am going to assume it's more than I've done.

If I were to see a bead like the one in photo one, I would do one or more of three things:
1. Decrease the stickout by half
2. Increase the current (wirefeed speed) and voltage
3. S L O W D O W W W N

Since you probably know all that I wonder why it didn't work?

DrBob

P.S. Awesome bead on photo two!

[Hobweld]

Originally Posted by DrBob

DrBob

P.S. Awesome bead on photo two!

Yes it is, Not my welds though. However my unit will produce similar welds and I have tried all the things you mentioned.

Hence the modifications. This is just a little side project I have a powermig 255 for the critical stuff.
Ken

[GWIZ]

Originally Posted by Hobweld

GWIZ

Ok, I looked on digikey for a relay and all I can say is my head hurts. Could you point me in the right direction?

Ken

I'll look at Mouser.

How far along are you on this project, in other words what parts do you have and installed/tried.
Maybe we can go a different route. thinking just lowering the voltage to the feeder.

As for the pictures you posted of the weld, third party.
Picture one looks like a large hunk of steel and I may expect a bad weld on something like that.
Picture two, guessing it maybe 1/8" plate which would give a better weld.

As for adding the 100,000 uf cap,
I'm sure you will get a better weld to some point, I want to do the same thing it's just low on my list.

Just an advanced warning, when a capacitor first charges it looks like a dead short and draws alot of power, this size capacitor will have a large surge current each time it charges.
It can over stress the diodes and they may fail at some point eventually.

[Hobweld]

Originally Posted by GWIZ

I'll look at Mouser.

How far along are you on this project, in other words what parts do you have and installed/tried.
Maybe we can go a different route. thinking just lowering the voltage to the feeder.

As for the pictures you posted of the weld, third party.
Picture one looks like a large hunk of steel and I may expect a bad weld on something like that.
Picture two, guessing it maybe 1/8" plate which would give a better weld.

As for adding the 100,000 uf cap,
I'm sure you will get a better weld to some point, I want to do the same thing it's just low on my list.

Just an advanced warning, when a capacitor first charges it looks like a dead short and draws alot of power, this size capacitor will have a large surge current each time it charges.
It can over stress the diodes and they may fail at some point eventually.

GWIZ

I have the capacitor both large and small, and the bridge rectifier.

I have not started the install as of yet, I want to get all my ducks in a row so when I start I can go to town.
Ken