Hello,
I wonder if anybody could clear out the confusion in regards to two phase power supplies.
I have an induction motor, running off a three phase VFD. I need to add a small 24VDC power supply, so that logic would be powered separately on the VFD.
On MeanWell website I have a choice between:
1. WDR series power supplies, which as I understand could be wired into two out of three phases and should support 24VDC. Example:
https://www.meanwell-web.com/content/files/pdfs/productPdfs/MW/WDR-60/WDR-60-spec.pdf2. TDR series power supplies, which just simply power off all three phases.
https://www.meanwell-web.com/content/files/pdfs/productPdfs/MW/TDR-240/TDR-240-spec.pdfPlease ignore the current ratings of the PSU, question is about Uin side of things.
I really want to avoid have a five wire feed into the control cabinet and do not want to use the Neutral for the single phase power supply (not available as it is installed at the moment). Two phase Uin is half a price to three phase Uin. The feed into the VFD is 32A three phase.
Then only issue with two phase power supply I could see is unbalanced phase loading, but would that really matter, when VFD is 15kW and the PSU taps in half an amp? Or do I not understand something?
Maybe there is some white paper I could ready to build a better understanding?