So, what did you decide? 208V wye or 240 delta?
240 Delta, thanks for your help sir!
So, what did you decide? 208V wye or 240 delta?
240 Delta, thanks for your help sir!
240 Delta, thanks for your help sir!
Guessing hi leg delta, solves grounding and you can serve 120V loads, lights and GP receptacles.
Curious. Does it work well with VFD?
Ask jraef.
Paging Jraef in 3, 2, 1...
Hey, a guy’s gotta work some time...Paging Jraef in 3, 2, 1...
True, all VFDs are designed around a Wye system. There will be protection devices on the incoming line rectifier (MOVs) that are in a Wye pattern and referenced to ground. When connected to Delta sources, their ground connection will attempt to become the Wye point for the entire system and the first time there is a ground fault anywhere on that system, unrelated to the drive, the current will want to flow through that connection in the drive until it vaporizes the MOV, which will damage the drive. Some drives give you a way to disconnect that ground reference, some do not. RTFM, but understand that some of those that do not simply say something like “This drive is suitable for use only on an IT system...” or words to that effect. That’s an IEC terminology that means nothing to people here, but is referring to a solidly grounded Wye system. So anything that is NOT a solidly grounded Wye system is not suitable to use that drive on, which is basically any 240V system here (208V would be Wye). This is what you will see on a lot of Asian drive designs. It’s a coward’s way out in my opinion. They word it in a way that nobody understands, then when the drive tries, they say “Told you so!” and you are stuck with it.IIRC, VFDs like wye not delta. But unsure.
Hey, a guy’s gotta work some time....
This question has come up often enough, and there are enough corner-grounded and high-leg systems out there, that it seems like someone, somewhere, would offer a compatible VFD. No?... all VFDs are designed around a Wye system. ...
Hey, a guy’s gotta work some time...
True, all VFDs are designed around a Wye system. There will be protection devices on the incoming line rectifier (MOVs) that are in a Wye pattern and referenced to ground. When connected to Delta sources, their ground connection will attempt to become the Wye point for the entire system and the first time there is a ground fault anywhere on that system, unrelated to the drive, the current will want to flow through that connection in the drive until it vaporizes the MOV, which will damage the drive. Some drives give you a way to disconnect that ground reference, some do not. RTFM, but understand that some of those that do not simply say something like “This drive is suitable for use only on an IT system...” or words to that effect. That’s an IEC terminology that means nothing to people here, but is referring to a solidly grounded Wye system. So anything that is NOT a solidly grounded Wye system is not suitable to use that drive on, which is basically any 240V system here (208V would be Wye). This is what you will see on a lot of Asian drive designs. It’s a coward’s way out in my opinion. They word it in a way that nobody understands, then when the drive tries, they say “Told you so!” and you are stuck with it.