I acquired a Weg 10HP 230V 3 Phase input VFD. I currently have it connected to a 2HP motor to test it (I bought it used) but eventually I'll use it with a 3HP motor. The VFD doesn't specify it as being able to run on single phase, but it seems to work just fine. I connected the power to L1 and L2 and skipped L3 as Weg specifies for models that both single and 3 phase are options.
Everything I've read here and elsewhere indicates that this is fine and 3HP is well within the VFD's derated capacity. So I don't think I need to change anything.
BUT, I see a few diagrams where one leg of the single phase is connected to 2 legs of the drive. I know little about electronics but from what I do understand it seems like that should work.
And with a couple of diodes, it seems you could connect both of the single phase legs to the 3rd VFD leg.
If the diodes worked, I would think it would be common practice. So my question is why doesn't it work?
And also why not connect one single phase leg to two 3 phase legs?
Everything I've read here and elsewhere indicates that this is fine and 3HP is well within the VFD's derated capacity. So I don't think I need to change anything.
BUT, I see a few diagrams where one leg of the single phase is connected to 2 legs of the drive. I know little about electronics but from what I do understand it seems like that should work.
And with a couple of diodes, it seems you could connect both of the single phase legs to the 3rd VFD leg.
If the diodes worked, I would think it would be common practice. So my question is why doesn't it work?
And also why not connect one single phase leg to two 3 phase legs?