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IB140024EN
For more information visit: www.eaton.com
Instruction Booklet
Effective: October 2014
Page
19
ATC-300/900 40-400A (480/600Vac)
3-Postion Contactor Based Transfer Switch
4.8 ATC-900 Connections
The rear access area of the ATC-900 is normally accessible from
the rear of an open switch panel door. All wiring connections to
the ATC-900 are made at the rear of the chassis. For the sake of
uniform identification, the frame of reference when discussing
the rear access area is facing the back of the ATC-900 with the
panel door open. Keeping safety in mind, programming and
downloading setpoints, history, and events can all be accom-
plished with the front door closed.
4.8.1 Connections on Chassis
The rear of the chassis provides self locking female connectors.
See Figure 14 for connections for the left, right, and top of the
ATC-900. See the ATC-900 controller instruction booklet for
more information on input and output functionality.
The J numbers of the connectors are shown below:
Connector Designation
J1 Source 1 Sense Lines
J2 Source 2 Sense Lines
J3 Load Sense Lines
J4 Programmable Outputs (4) & Source Available Form C
J5 RS-232 (Factory Use)
J6 Transfer Control and Aux Inputs
J7 Control Power from Sources 1 and 2
J8 USB Stick Drive Connection (connector brought out to
front door panel)
J9 Programmable Inputs (4)
J11 I/O Module Interface
J12 Modbus 485 (User)
J13 RS-422
J14 DCT Module Interface
RIGHT SIDE VIEW
LEFT SIDE VIEW
J15 S1 & S2 Generator
Start
J4 (4 Programmable Form C Outputs)
J5
J1, J2, J3
Connectors
J12 User Modbus
K1=S2 Open
K2=S1 Open
K3=S1 Close
K4=S2 Close
J7
Control Power
Sources 1 and 2
TOP VIEW
J4 Source
Available Outputs
J9
4 Programmable
Inputs
J6
RS-232
J14
CT
Earth Controller Ground
J8 USB Front Panel Memory
Stick Interface
J11 I/O
Module(s)
SW1 Modbus
Terminator
Module
J13
RS-422
Interface
Source/Load
Interface
Switch Position
Contacts
Figure 14. ATC-900 (Top Left, and Right Side Views).