Proper Fuse Breaker And Wire Sizing For The SMV Variable Frequency Drive (VFD)
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[Let’s look at the] fusing chart on in the manual. If I pull it up it actually does it all based on part number. So when I pull up this part number on the side of my drive, it is ESV-371-N01-SXB. So then I just look that up here: ESV 371 N01 SXB. I follow that chart across to the right.
I have a couple options here. I can use a 16 amp fuse, use a 15 amp breaker, [or a] 15 amp fuse. It even gives me a recommended part number for my fuse. It recommends 14 gauge wire. I mean that’s pretty much all I need to know. Now the reason the fusing is a lot higher than the rated output current of the drive is because it’s rated for over-current.
So [for] recommended fuses we usually recommend fast blow fuses. That’s going to be your ideal protection. Obviously, a breaker is going to be a lot slower in reacting to an over-current situation. Standard fuses also can be a lot slower in reacting. The more time it takes for it to react the more potential damage can be caused to the drive as a result of whatever the overcurrent is.