Appendix B: Operational Flowcharts - Eaton ATC-300 Mode D'emploi

Instruction Booklet
Page 26 Effective: January 2006
APPENDIX B: OPERATIONAL
FLOWCHARTS
Utility - Generator Transfer Switch
Dual Utility Transfer Switch
In-phase Transition Implementation
Utility - Generator Transfer Switch
Source 1 is powering the load
Source 1 becomes unavailable
(or Engine Test, Plant Exercise, Go To Emergency)
Send "Engine Start" signal
(Energize Gen Start relay)
Source 2 is powering the load
ATC-300 Automatic
Transfer Switch
Controller
Source 1 is available
Close Source 1
(Energize K1)
TDES timer times out
Is Source 2
Available?
Yes
TDNE timer times out
TPRE timer times out
(If Source 1 is Available)
Open Source 1
(Energize K2)
Close Source 2
(Energize K2)
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TDEN timer times out
No
Source 1 is powering the load
TDEC timer times out
Remove "Engine Start" signal
(De-energize Gen Start relay)
Is Source 1
Available?
Yes
TPRE timer times out
Open Source 2
(Energize K1)
Close Source 1
(Energize K1)
No
IB01602001T