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1
O PER AT I O N , M A I N T EN A N C E , A N D I N S TA L L AT I O N G U I D E
The switching to available source can be
summarized in the following steps:
1. An anomaly occurs on SOURCE 1
2. Override momentary S1 outage delay
3. Pre-transfer signal on
4. Pre-transfer S1 to S2 delay
5. Transfer switch (SOURCE 1) to
position O
6. Center-off delay (only with Delayed
transition I - O - II type)
7. Transfer switch (SOURCE 2) to
position II
8. Post-transfer S1 to S2 delay
9. Pre-transfer signal off
When an anomaly occurs in the source in-
use, the re-transfer to available source
can be summarized in the following steps:
1. SOURCE 1 is restored
2. An anomaly occurs on the SOURCE 2
3. Pre-
transfer signal on
4. Pre-transfer S2 to S1 delay
5. Transfer switch (SOURCE 2) to
position O
6. Center-off delay (only with Delayed
transition I - O - II type)
7. Transfer switch (SOURCE 1) to
position I
8. Post-transfer S2 to S1 delay
9. Pre-transfer signal off
2.6.1.3 No Source Priority (Generator
and load shed usage disabled)
Summary of Contents for Zenith ZTG T Series
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