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IB01602015E
For more information visit: www.eaton.com
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
S
o
u
rce 1 i
s
a
v
a
il
ab
le
Clo
s
e
S
o
u
rce 1
(Energize K1)
Source 1 is powering the load
I
s
S
o
u
rce 2
Av
a
il
ab
le?
TDNE timer time
s
o
u
t
Open
S
o
u
rce 1
a
nd clo
s
e
S
o
u
rce 2
(Energize K2)
(Energize K4)
Source 2 is powering the load
Energize Al
a
rm rel
a
y
Ye
s
No
No
Source 2 is powering the load
Receive req
u
e
s
t to tr
a
n
s
fer to
S
o
u
rce 2
(or Engine Te
s
t, Pl
a
nt Exerci
s
e, Go To Emergency)
TDE
S
timer time
s
o
u
t
S
end "Engine
S
t
a
rt"
s
ign
a
l
(Energize Gen Start relay)
S
ync timer time
s
o
u
t
S
o
u
rce
s
s
ynchronized
b
efore
S
ync timer
time
s
o
u
t
Ye
s
S
end
s
pretr
a
n
s
fer
s
ign
a
l
TPRE timer time
s
o
u
t
(If
S
o
u
rce 1 i
s
a
v
a
il
ab
le)
Open
S
o
u
rce 1
(Energize K2)
Clo
s
e
S
o
u
rce 2
(Momentarily energize K4)
(out of Sync)
TDN timer time
s
o
u
t if not
progr
a
mmed eq
ua
l to zero.
(For 2-po
s
ition cont
a
ctor AT
S
,
TDN i
s
not
a
pplic
ab
le & hence
recommended to progr
a
m TDN=0)