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#1
07-20-2010, 12:22 AM
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Capacitor Mod on Astro pocket turbo 130
I will be adding a 100000 uF Capacitor 50 V to this welder. I have pretty much figured out the connections for it and the bleed resistor. I am having a problem with the additional bridge rectifier connections. The pcb and drive motor in this unit get voltage from the gun when the trigger is pulled. Now how to wire in the second rectifier to isolate the pcb and drive motor and not fry them when I pull the trigger. The person who sent me this diagram added a euro torch to his and it has a two wire lead from the gun where mine is a single lead. He also added a 120 gas solenoid, since the old torch had a mechanical valve in the handle. I don't want to replace the torch if I don't need to. Any Ideas? Ken
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There are 10 types of people in the world, those who speak binary and those who don't. 
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#3
07-20-2010, 01:50 AM
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Quote:
Quote:
Quote:
__________________
* * The factory of the future will have only two employees, a man and a dog. The man will be there to feed the dog. The dog will be there to keep the man from touching the equipment. ~Warren G. Bennis
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#4
07-20-2010, 02:17 AM
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By adding the capacitor,the drive motor runs extremely fast, and the speed adjustment has no effect. The cap affects the speed controller. Adding in the second rectifier acts as a isolator and problem was solved.
They also added another 100uf 35V capacitor to the wire feed motor to help smooth the wire feed a bit. Ken
__________________
There are 10 types of people in the world, those who speak binary and those who don't.
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#5
07-20-2010, 02:46 AM
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It's getting late so I cant go into details.
You could probably add a relay. have your gun trigger the coil and the normally open contacts of the relay connected to the two trigger wires on the new drawing. may have to add a resistor to a 24 volt relay. adding the larger cap probably brought the voltage up around 35 volts. As for the new motor capacitor, looks like they have its polarity marked wrong and it should be more like 50 volts or more
__________________
* * The factory of the future will have only two employees, a man and a dog. The man will be there to feed the dog. The dog will be there to keep the man from touching the equipment. ~Warren G. Bennis
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#6
07-20-2010, 08:53 AM
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"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
__________________
There are 10 types of people in the world, those who speak binary and those who don't.
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#7
07-20-2010, 10:27 AM
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I'm tied up this morning to make you a drawing, maybe around 1pm.
you should be able to add a relay and use the gun you have. you would remove the two wires A3 and A1 (old drawing) ,and use them to power the relay. Use the two relay contacts to trigger the two wires (gun) as on the new drawing.
__________________
* * The factory of the future will have only two employees, a man and a dog. The man will be there to feed the dog. The dog will be there to keep the man from touching the equipment. ~Warren G. Bennis
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#8
07-20-2010, 10:53 AM
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Here Ya Go
Here ya go, Hobby! It's very straightforward. You're just duplicating the rectifier and filter of the first gun. Make sure to heat sink and cool the rectifier module with a fan. I've often thought I'd like to do the same to my MM180 so I could have my spoolgun always attached but I'm too lazy to plumb the gas fittings!
If I ever do it, I will bolt a metal box to the top of the welder and run the DC, Gas and control voltage to it. That way I won't mar the beautiful miller front panel and I could always restore the welder to original condition. DrBob
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#9
07-20-2010, 11:04 AM
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Ken,
I don't understand the Original post. What are you trying to accomplish ? do you want to smooth out the welding voltage somewhat ? are you trying to make a "stiffer" supply so that the short arc current goes up ? Or/and fixing this "single wire gun switch" problem ?
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#10
07-20-2010, 12:43 PM
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I will be adding the large cap and bleed resistor at the original rectifier,sooo basically for the small bridge rectifier I am adding I could just pull AC of of the input to the main rectifier, and then attach as you said? Correct?
__________________
There are 10 types of people in the world, those who speak binary and those who don't.
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