For more information visit: www.eatonelectrical.com IB01602009E
Instruction Booklet
Page 14 Effective: April 2004
ATC-300 Automatic
Transfer Switch
Controller
The S1 device Alarm will occur if the switch is commanded
to go from S1 to S2 and the S1 connected input is NOT
removed within 6 seconds after the command to transfer.
The S1 device Alarm will also occur if the switch is com-
manded to go from S2 to S1 and the S1 connected input is
NOT connected within 6 seconds after the command to
transfer from the neutral position. That is the K2 relay closes
AFTER TDNE or after TD PRE-TRAN times out, if the S1 con-
nected input is NOT opened within 6 seconds the K2 relay
will open and an S1 device error message, “SOURCE 1
DEVICE”, will be displayed.
A typical transfer request will begin with an S1 outage (S1
becomes unavailable per the programmed setpoints), Engine
Test, or Plant Exercise function. After TDES, if programmed,
counts down, the Generator Start contact will close. For a
Plant Exercise or Engine Test, the S2 available light MUST
become available within 90 seconds or the generator start
contacts will reopen. Once S2 meets the requirements to be
considered available, then TDNE, if programmed, will time
down. TD PRE-TRAN will time down if programmed and if S1
is available (Engine Test or Plant Exercise). The K2 relay will
energize. The S1 connected input MUST open within 6 sec-
onds (see above). K2 will open IF TDN is programmed. TDN
will then time down and K2 will energized until the S2 con-
nected input is closed (this MUST happen within 6 seconds
of K2 closure or the S2 device alarm will trigger and the K2
relay will deenergize). Once the S2 connected input is satis-
fied, K2 will open.
When S1 returns and becomes available per the programmed
setpoints, TDEN, if programmed, will time out. TD PRE-
TRAN, if programmed, will time out. K1 will energize for no
longer than 6 seconds or until the S2 connected input is
removed. If the 6 seconds times out, then an S2 device
Alarm will trigger and K1 will open. Once the input is
removed, then K1 will open if TDN is programmed. TDN will
time down and K1 will reclose until the S1 input is satisfied,
but for no longer than 6 seconds. If the 6 seconds is
reached, then an S1 device Alarm will be triggered and the
K1 relay will open. If the S1 connected input is satisfied,
then K1 will open and TDEC will time down and open the
engine start contact.
The Go To Source 2 input (normally closed, open to initiate)
causes the Engine Start contacts to close. Once the S2 sens-
ing satisfies the setpoints programmed, then a transfer is initi-
ated. The transfer functions as described above. The
controller will maintain the Engine Start contacts and the S2
connected as long as the Go To Source 2 input is maintained.
Once it is removed, a retransfer to S1, if S1 is available per
the setpoints, will occur and functions as described above.
“Go To Source 2” is displayed on the controller.
The Monitor Mode input (normally open, close to initiate) is
utilized to put the controller in a “Monitor” only state. No
other inputs will affect the operation of the controller when
the Monitor Mode input is initiated. The controller will ONLY
monitor the voltage and frequency of the S1 and S2 inputs.
Changing of the setpoints of the controller MAY be accom-
plished while in Monitor Mode. All setpoints are accessible
and all timers can be reset. “ATS Not In Automatic” is dis-
played on the controller.
The Lockout input (normally closed, open to initiate) is uti-
lized to place the controller in a state where it will NOT sup-
ply any outputs regardless the inputs. It is used to monitor
the state of any fault indicating devices. If the fault device
trips due to an over current or over load condition, then a
contact opening will place the controller in the Lockout state.
The Alarm contact will change state when the lockout signal
is sensed. “Lockout” is displayed on the controller. The fault
indicating device MUST be reset before the controller can be
reset or the Alarm will continue to indicate.
To Next Page
Loading...
