Coils bypassing switch

[mmiller60]

I am building a small two-pole magnetizer that uses two coils (DC provided by bridge rectifier). The positive and negative of the bridge rectifier have a small 1µF cap and MOV (275 VAC, 369VDC, Peak Current 6,500A, Peak Energy 140(J)) in series across them. A TRIAC is used to control the AC Voltage from the 110V Supply. (Should I be using an SCR instead of a TRIAC.) What is happening is that I can push the on/off momentary switch a few times with good results and then it's as if the switch is bypassed and I don't have the switch at all. The current continues and I have to unplug the machine to turn it off. This machine was originally designed for the 1µF cap and MOV to prevent that from occurring. Any suggestions?

 

[danadak]

Schematic ?

Pic of prototype se we can see layout and wiring.....


Regards, Dana.

 

[mmiller60]

Schematic ?

Pic of prototype se we can see layout and wiring.....


Regards, Dana.

Let me see if I can make up a schematic. Thank you.

Mark

 

[mmiller60]

Here's a picture of the wiring while I make a schematic. Voltage is 110V AC and about 15A. Thank you.

 

[Martaine2005]

Is the switch supposed to go on the gate?

Martin

 

[mmiller60]

Yes, that is the way it was designed...not my design, though. I've had a couple of assemblies that have worked perfectly fine but a couple of others have locked on and I have to remove the plug to turn off. Not sure if the TRIAC is locking on bypassing the switch or if something else is going on. We are using this TRIAC only because we use it in our capacitor-discharge magnetizer already and keeps from having to stock multiple components.

 

[danadak]

For future work here is a manual on how to use Traics, SCRs, trigger diodes :

Internet Archive: Digital Library of Free & Borrowable Books, Movies, Music & Wayback Machine

archive.org

Regards, Dana.

 

[mmiller60]

For future work here is a manual on how to use Traics, SCRs, trigger diodes :

Internet Archive: Digital Library of Free & Borrowable Books, Movies, Music & Wayback Machine

archive.org

Regards, Dana.

Thank you. I'll check it out.