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Refer to figure.
The function of X-TIE is…

  • A
    For redundancy in case the ESS TRU fails.
  • B
    To allow DC BUS 2 to be supplied in the case of a failure of TRU 2.
  • C
    To supply DC BUS 1 when the ESS TRU is feeding the ESS DC BUS.
  • D
    To allow DC BUS 1 to supply the ESS DC BUS in the case of ESS TRU failure.

Refer to figure.
The X-TIE breaker (DC) allows DC BUS 1 to supply DC BUS 2 and DC BUS 2 to supply DC BUS 1.

In normal operations, TRU 2 supplies DC BUS 2 and TRU 1 supplies DC BUS 1. If TRU (1 or 2) fails, DC BUS (1 or 2) can be supplied via the X-TIE link.

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