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Instruction Booklet
Effective: April 2006 Page 13
ATC-300 Automatic
Transfer Switch Controller
Section 4: Typical Function of the ATC-
300 Controller
The ATC-300 Controller operates as follows.
The input connections of the ATC-300 controller are wetted and
work on an opening or closure of an external contact. The output
connections are dry contacts and function depending on input
connections and / or source availability.
120 Vac, 60 Hz is required to power the ATC-300 controller.
Power is supplied to either pins 1 and 2 or 3 and 4 on the J-7
connector.
Source 1 (S1) sensing is supplied on the J-1 connector; Source 2
(S2) sensing is supplied on the J-2 connector.
K1 and K2 relays, located on pins 1 and 2 (K1) or pins 3 and 4
(K2) on the J-5 connector, along with the K3 and K4 relays,
located on pins 1 and 2 (K3) and pins 3 and 4 (K4) on the J8 con-
nector, are use to control device position. S1 and S2 inputs are
located on pins 1 and 2 (S1) or pins 3 and 4 (S2) on the J-4 con-
nector and are used to sense device position.
K1 and K3 close until the S1 input is satisfied but no longer than
6 seconds before the S1 device Alarm is triggered and the K1 and
K3 relays are deenergized. The K2 and K4 relays function the
same as the K1 relay in that they close until the S2 input is satis-
fied (closed) but no longer than 6 seconds before the S2 device
Alarm is triggered and the K2 and K4 relays are deenergized.
Either input MUST be satisfied prior to resetting the Alarm. The
S1 and S2 connected inputs are wetted inputs that require a con-
tact closure in order to be satisfied.
Figure 4. Connectors on the ATC-300 Controller.
123
4
56
7
8
9
10
11 12 13
14
123
4
56
7
8
9
10
11 12 13
14
123
4
56
7
8
9
10123
4
56
7
8
9
10
J5
J7
J2
J1
J4
1
2
3
4
5
1
2
3
4
5
J3
Phase C
Phase B
Phase A
Source 1
Phase C
Phase B
Phase A
Source 1
Phase C
Phase B
Phase A
Source 2
Phase C
Phase B
Phase A
Source 2
S1 - Line
S1 - Neut
S2 - Line
Control
Power
S2 - Neut
Clk
In
Out
5V
Gnd
Programming
Port
K1 - (Com)
K1 - (NO)
K2 - (Com)
K2 - (NO)
Pretransfer - (Com)
Pretransfer - (NO)
Pretransfer - (NC)
Alarm - (Com)
Alarm - (NO)
Alarm - (NC)
Earth Ground
Gen Start - (Com)
Gen Start - (NO)
Output Relays
+32 VDC
Source 1 Closed
+32 VDC
Source 2 Closed
+32 VDC
Lockout
+32 VDC
Go To Source 2
+32 VDC
Monitor Mode
Control Inputs
8.0 in.
6.5 in.
3
4
1
2
Output
Relays
J8
K4 NO
K4 C om
K3 NO
K3 Com
6
7
Rx
Tx
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