I have a 3ph Teco E510 that's stopped working with no warning. I am a very firm believer its the switching power supply just because it is 100% dead and thats almost what it always is. I may be incorrect.

Its 400v 3ph input to this unit. The voltages inside are scary enough to not be wanting to be poking around too much without a plan on what I need to look at. I was hoping someone might give me a bit of assistance, what I can easily check to fault find. If it gets too difficult then its going in the bin but it might be a simple fix. I guess, with the 3ph input I am a little confused when I look at this board is all.

So, perhaps 4-5 messages with pictures is the limit? Would someone give me a hand? Oh. I am a registered Electrician and a EST. Just not super electronics biased. Thanks in advance. Let me know and I will post some pictures of this unit. I hate throwing stuff away.

 

I have inspected the nana out of this board assembly. I even reassembled the unit thinking that perhaps a phase had dropped out or something over a contactor (grasping at straws). This unit I cant seem to find a rectifier, the vertical standing board though is to me the power supply. I did find a small surface mounted resistor thats corroded, and it comes off one of the legs of a chip that is an opamp.

Where too from here? Well I am at the stage of putting that board onto a fixture so I can put some power onto it and test for some voltages. One thing I will say, is I have tried again just to be sure it has a fault. On removal I put a meter accross both of the large capacitors to drain them. There was nothing in them zero volts....

I was going to start at what appears to be the output rail of pins where the board joins to the larger power board and go from there. I dont have a scope although have only used one once ever. Hoping someone might show me a bit more troubleshooting I hate throwing stuff out that is probably easily repaired.

There are heaps of cutouts in both boards for the high voltages. Being a three phase input unit I am a little lost to be honest. No rectifier that I can see. Its all a bit complicated to me.

 

Typical of most VFD's is the input would go directly to a 3ph rectifier and then a large bank of electrolytic capacitors?
I see large caps, can you see what feeds them?
Also generally there is a LV transformer for the control electronc circuits.

 

Hi. So this is what has stumped me a little. The pic attached, the transformer is fed by a mossfet 3N150 and by the board cutouts, will be high voltage. I am having trouble seeing how the large caps are fed I will run over it with a meter today and report back. Ive brought some decent test gear home so am going to see what voltages I have around the board today.

 

That appears to be a high end VFD in spite of the scarcity of some components .
Do you have all the literature on it?
https://www.tecowestinghouse.com/product/e510-nema-4-12-ac-drives/