Chapter 4 Installation & Wiring
40
NOTE:
When the total number of the parallel UPS units is more than four,
please install a load sharing choke between each parallel UPS and its
FRQQHFWHGE\SDVVLQSXWSRZHUWRHQVXUHWKDWHDFKE\SDVVLQSXWSRZHU¶V
current is even. For more information, please contact your local dealer,
sales representative or Delta customer service.
7KHH[WHUQDOEDWWHU\FDELQHWPXVWEHJURXQGHGDQGFRQQHFWHG WRWKH836¶V
µ%DWWHU\&DELQHW*URXQG¶WHUPLQDO'RQRWFRQQHFWWKHH[WHUQDOEDWWHU\FDELQHW
to any other grounding system.
4.5.2 NT-series 500kVA Installation and Wiring
NT-series 500kVA consists of two cabinets. Before wiring, you have to join them
WRJHWKHU¿UVWFigure 4-34).
Figure 4-34