VFD doesn't like heat

[AGCB97]

Had it apart on the table and could see nothing obvious. I did resolder a few suspect joints. Put it back into service and same thing happened. Morning temperatures in the shop made it work just fine but afternoon temps above about 75 F and it would not turn on at all.

I waited till a cool morning, so it was working good and then used a heat gun to heat one spot at a time. Kept working no matter what. So I turned it off and heated the whole thing to 'warm to the touch'. Still kept working fine, till afternoon.

Trying to think of a use for it when no summer temps are expected!

Set up a new Huangyang unit yesterday. Now I'm happy again.

Aaron

 

[woodchucker]

sounds like you might have an incoming voltage problem for that unit. when above 75, too many air conditioners on the line? Not just in your house... maybe a brownout?

 

[AGCB97]

I've checked the incoming voltage at the time of the malfunction, and it is 240 volts give or take a few.

 

[AGCB97]

With my old XSY-AT1 VFD I was able to run my belt grinder at 75 Hz. I grinds much faster at 75 compared to 60Hz. I can't figure out how to do that with this Huangyang unit. It must be similar to running a spindle at high RPM but I haven't figured it out yet.
Any help would be appreciated.
Aaron

 

[MikeInOr]

Do you want the frequency fixed at 75hz or do you want it variable and set with the onboard potentiometer?

 

[markba633csi]

I think a great number of large screen TVs and other electronics end up in landfills because of bad capacitors. Is a shame

 

[AGCB97]

Do you want the frequency fixed at 75hz or do you want it variable and set with the onboard potentiometer?

Yes, I want to be able to control it with the potentiometer for fine sharpening and belt tracking

 

[Rich Berg]

Hi is the heat sink clear of debris that could restrict the flow of air?

 

[AGCB97]

Yes, but, this wont even come on if it's warm. There is no heat build up.

 

[rwm]

This is such a weird problem. I hope to hear the answer.