Smoked

[ptonsparky]

View attachment 10475

200 HP vfd. Owner said it would not start in Hand and noticed this smoke/burn mark.
Two hours away. It was operator error on starting in Hand but the mark has me puzzled.
Drive starts and runs fine. No burnt smell inside the enclosure. No noticeable damage.

Lightning? The primary passes the property in a "T" with this xfmr bank at the bottom of the T. 1/4 mile.
Yes, ground rods, and with typical surge protection at POCO pole.

 

[north star]

= = ) + ( = =

Are you sure that is smoke remnants ?..........Possibly something else,
...maybe grease \ dirt from previous work or installing something ?

If that is smoke remnants, ..have you looked behind the bracket
on the VFD to investigate ?

= = ( + ) = =

 

[just the cowboy]

lots of heat or arcing

lots of heat or arcing

Look at that stud on the left, lots of heat to do that or thats where it flashed once.

 

[jim dungar]

It looks like no more than standard 'chimney effect' dust and dirt accumulating above a heat sink.

 

[FionaZuppa]

i do forensics work, some observations.
1) i have no idea what this device is
2) the "blast" direction was up to the left at shallow angle, notice the head of carriage bolt shielded some "blast"
3) the hex heads in the unit, the one on left looks clean, the one on the right looks scorched
4) is there some type of cover for this, one that would have shielded the wall just under the carriage bolt head?

 

[ptonsparky]

i do forensics work, some observations.
1) i have no idea what this device is
2) the "blast" direction was up to the left at shallow angle, notice the head of carriage bolt shielded some "blast"
3) the hex heads in the unit, the one on left looks clean, the one on the right looks scorched
4) is there some type of cover for this, one that would have shielded the wall just under the carriage bolt head?

This the heat sink for an AB Vfd. Hoffman type enclosure for this use. Exposed to the elements. No cover.

 

[ptonsparky]

DC choke

DC choke

This the heat sink for an AB Vfd. Hoffman type enclosure for this use. Exposed to the elements. No cover.

Looks worse today. It is the DC choke that went toes up. They have a quick replacement available. Still $$$$$:jawdrop: