2
Features
2.0
There are three types of features incorporated into the ATC-900 RAC: Status, Control,
and Setpoint Editing.
Status Indicators
S1 / S2 Available
S1 / S2 Preferred
S1 / S2 Connected
S1 / S2 Status (Under/Over Voltage, Under/Over Frequency, etc.)
Emergency Inhibit
Lockout / Monitor Mode
Closed on Emergency
Go to Emergency Active
Engine Test Active
Transfer in Progress
Source 1 Voltage Metering
Source 2 Voltage Metering
Load Voltage Metering (includes Current if DCT module is installed)
Waiting for Manual Retransfer
History of Events
Active Timer
Control Pushbuttons
Go to Emergency / Cancel Go to Emergency
Start / Stop Engine Test
Alarm Silence
Remote Alarm Reset
Bypass Timers
Manual Retransfer
Setup and Wiring
3.0
The RAC requires 24VDC power with a minimum current of 360 mA (See “A” below).
There is a terminal block connector on the back of the unit to install wires for the
power. The software comes preloaded onto the unit according to your switch
configuration, and should require no user programming.
The RAC supports Modbus RTU (serial RS-485) and Modbus TCP/IP (Ethernet).
However, since the ATC-900 controller only supports serial Modbus, an RS-485 serial-
to-Ethernet gateway must be used for Modbus TCP/IP. Eaton recommends using the
ELC-CAENET module or a Power Xpert Gateway (PXG-900).
Drawing 66A8395 shows the wiring of the unit over serial Modbus. Consult drawing
66A8395E (or EM) when using Ethernet gateways. All RS-485 serial cable must have
three insulated conductors (D0, D1, COM) and one ground (drain) connected to the
shielding of the cable. The Eaton recommended cable is Belden 3106A. Ethernet
cable may be any CAT5/6 certified cable.
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