Eaton Cutler-Hammer ATC-300 - In-phase Transition Implementation Flowchart

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Instruction Booklet
Page 28 Effective: April 2006
ATC-300 Automatic
Transfer Switch Controller
Appendix
In-Phase Transition Implementation
Source 1 is available
Close Source 1
(Energize K1)
Source 1 is powering the load
Is Source 2
Available?
TDNE timer times out
Open Source 1 and close
Source 2
(Energize K2)
(Energize K4)
Source 2 is powering the load
Energize Alarm relay
Ye s
No
No
Source 1 is powering the load
Receive request to transfer to Source 2
(or Engine Test, Plant Exercise, Go To Emergency)
TDES timer times out
Send "Engine Start" signal
(Energize Gen Start relay)
Sync timer times out
Sources
synchronized
before Sync timer
times out
Ye s