ABB Zenith ZTX Series Operation, Maintenance, And Installation Manual page 25

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SOURCE 1 priority (SOURCE 2 = generator)
Switch position I
Switch position II
SOURCE 1 OK
SOURCE 2 OK
Generator started
Override momentary S1 outage delay
Transfer from S1 to S2 delay
Override momentary S2 outage delay
Transfer from S2 to S1 delay
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Table 2.3 Automatic Switching Sequences, SOURCE 1 Priority (SOURCE 2 = Generator)