10
Zenith ZTS(D) 30-1200A ATS, QUICK START USER MANUAL
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Operation
Switching sequence / Automatic
SOURCE1 Priority (SOURCE2 = Generator)
The switching sequence can be summarized
in the following steps:
1. An anomaly occurs on SOURCE 1
2. Override momentary S1 outage delay
3. Generator start
4. SOURCE 2 OK
5. Transfer from S1 to S2 delay
6. Pre-transfer signal on
7. Load shed signal on
8. Pre-transfer S1 to S2 delay
9. Load shed delay
10. Transfer switch (SOURCE 1) to position O
11. Center-off delay (only with Delayed
transition I - O - II type)
12. Transfer switch (SOURCE 2) to
position II
13. Post-transfer S1 to S2 delay
14. Pre-transfer signal off
The re-transfer sequency can be
summarized in the following steps:
1. SOURCE 1 is restored
2. Transfer from S2 to S1 delay
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. Load shed signal off
9. Generator stop delay
10. Post-transfer S2 to S1 delay
11. Pre-transfer signal off
12. Generator stop
13. SOURCE 2 off
SOURCE2 Priority (No generator)
The switching sequence can be
summarized in the following steps:
1. An anomaly occurs on SOURCE 2
2. Override momentary S2 outage delay
3. Transfer from S2 to S1 delay
4. Pre-transfer signal on
5. Load shed signal on
6. Pre-transfer S2 to S1 delay
7. Load shed delay
8. Transfer switch (SOURCE 2) to
position O
9. Center-off delay (only with Delayed
transition I - O - II type)
10. Transfer switch (SOURCE 1) to
position I
11. Post-transfer S2 to S1 delay
12. Pre-transfer signal off
The re-transfer sequence can be
summarized in the following steps:
1. SOURCE 2 is restored
2. Transfer from S1 to S2 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 I
8. Load shed signal off
9. Post-transfer S1 to S2 delay
10. Pre-transfer signal off
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