Eaton ATC-300 - Problem Solving Guidelines; Adjustments and Programming; Controller Adjustments and Programming

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Instruction Booklet
Effective: August 2010 Page 31
ATC-300 2-Postion Contactor 
Based Transfer Switch
Figure 26. In-Phase Transition Implementation.
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 2 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
Sends pretransfer signal
TPRE timer times out
(If Source 1 is available)
Open Source 1
(Energize K2)
Close Source 2
(Momentarily energize K4)
(out of Sync)
TDN timer times out if not
programmed equal to zero.
(For 2-position contactor ATS,
TDN is not applicable & hence
recommended to program TDN=0)