upsguy
Member
- Location
- San Diego, CA
Looking to install a large three phase UPS 3 phase 400V 60hz that has no internal transformers. The UPS is designed to be feed by two separate utility sources, in this case 400v 60hz. The only transformers in the entire lineup will be the Medium Voltage/400V at the building entrance. There are two 3000kva transformers being feed from two separate utility sources.
So the primary load Data Center servers, will be feed 230V L-N voltage. The UPS requires 3w + G on the Mains 1 Rectifier input and 4w + G on the bypass.
My question is:
Primary operation is Mains 1 through the UPS to the load. The only Neutral in the system is derived on the secondary of the Mains 2 transformer. How can the loads operate 230 L-N when the N being used is from a different source as the primary transformer?
So the primary load Data Center servers, will be feed 230V L-N voltage. The UPS requires 3w + G on the Mains 1 Rectifier input and 4w + G on the bypass.
My question is:
Primary operation is Mains 1 through the UPS to the load. The only Neutral in the system is derived on the secondary of the Mains 2 transformer. How can the loads operate 230 L-N when the N being used is from a different source as the primary transformer?