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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
2.6.2 Switching sequence / Automatic
(Closed transition)
2.6.2.1 SOURCE 1 Priority
(SOURCE 2 = Generator)
The switching sequence can be
summarized in the following steps:
1. Activate test on load (HMI or digital
input)
2. Generator start
3. Run engine warm-up timer
4. Pre-transfer S1 to S2 delay
5. Check source synchronization
6. Close SOURCE 2 contacts
7. Open SOURCE 1 contacts, start ETT
timer (parallel mode)
8. Post-transfer S1 to S2 delay
The re-transfer sequence can be summa
-
rized in the following steps:
1. Cancel test on load (HMI or digital
input)
2. SOURCE 1 availability timer
3. Pre-transfer S2 to S1 delay
4. Check source synchronization
5. Close SOURCE 1 contacts
6. Open SOURCE 2 contacts, start ETT
timer (parallel mode)
7. Post-transfer S2 to S1 delay
8. Run engine cool down timer
9. Generator stop
Summary of Contents for Zenith ZTG T Series
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