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Refer to figure.
In case of failure of the TRU 2: (NB: all contactors not mentioned are assumed to remain open)
  • A
    DC BUS 2 cannot be fed via DC BAT BUS.
  • B
    DC BUS 2 can be fed by TRU 1 via DC BUS 1 and DC BAT BUS if C5.1, C7.1 and C7.4 are closed.
  • C
    DC BUS 2 can be fed by TRU 1 if C3.1 and C3.2 are closed.
  • D
    DC BUS 2 can be fed via DC ESS BUS if C5.3, C3.2 and C5.2 are closed.

Refer to figure.
In case of failure of TRU2, DC BUS 2 can be fed by TRU 1 via DC BUS 1 and DC BAT if C5.1, C7.1, and C7.4 are closed.

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