Hey, this might be a simple question, but I don't think I ever ran into it before.
We all know that on 3ph, any two leads can be swapped to switch the rotation of the motor. Does this not work through a vfd? I suppose with the DC bridge, etc. the output phasing is not necessarily sequential with the input phasing.
At any rate, today I had wired up a panel with a couple vfds and all the motors went the wrong way. Normally, i switch the leads in the terminal box, but since all the motors were going the wrong way, I thought I would just try to switch two leads at the incoming power disconnect. Well that didn't make any difference. Swapped two leads on the line side of the drive and they still went backwards.
Is that normal?
We all know that on 3ph, any two leads can be swapped to switch the rotation of the motor. Does this not work through a vfd? I suppose with the DC bridge, etc. the output phasing is not necessarily sequential with the input phasing.
At any rate, today I had wired up a panel with a couple vfds and all the motors went the wrong way. Normally, i switch the leads in the terminal box, but since all the motors were going the wrong way, I thought I would just try to switch two leads at the incoming power disconnect. Well that didn't make any difference. Swapped two leads on the line side of the drive and they still went backwards.
Is that normal?