For more information visit: www.eaton.com
IIB01602019E
Instructional Booklet
Page
16
Effective: March 2010
O&M Manual for the Eaton ATC-100
Automatic Transfer Switch Controller
Appendix A: Operational Flowchart
Utility is available
Is Generator
available?
Close Generator breaker
(Momentarily energize K2)
N
Close Utility switching device
(Momentarily energize K1)
Utility becomes unavailable
(or System Test, Generator Test)
TDES timer times out
Send “generator start” signal
(Energize Gen Start relay)
TDNE timer times out
Open Utility breaker
(Momentarily energize K2)
Y
Generator is powering the load
TDEN timer times out
Open Generator breaker
(Momentarily energize K1)
Close Utility breaker
(Momentarily energize K1)
N
Is Utility
available yet?
Y
Utility is powering the load
Utility is powering the load
TDEC timer times out
Remove “generator start” signal
(De-energize Gen Start relay)
TDN timer times out
(if enabled)
TDN timer times out
(if enabled)
TDN Implementation (Only for Breaker Type ATS)
