IB140036EN
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Instruction Booklet
Effective: October 2014
Page
17
O&M Manual for 40-1200A (480/600 Vac) ATC-900 3-Position,
Open/Closed Transition Contactor Based Transfer Switch
4.5 Wiring
WARNING
POWER CONDUCTORS AND CONTROL WIRING MAY HAVE VOLT-
AGE PRESENT THAT CAN CAUSE SEVERE PERSONAL INJURY OR
DEATH. DEENERGIZE ALL POWER OR CONTROL CIRCUIT CON-
DUCTORS BEFORE BEGINNING TO PERFORM ANY WIRING ACTIV-
ITY TO OR WITHIN THE ATS EQUIPMENT.
Power sources, load conductors, and control wiring should be
connected to locations as indicated in the customer wiring dia-
gram supplied with the ATS equipment.
CAUTION
ENSURE THE ATS VOLTAGE IS SET CORRECTLY. IT SHOULD BE
THE SAME AS THE SOURCE 1 AND SOURCE 2 LINE VOLTAGES.
OPERATING THE EQUIPMENT ON IMPROPER VOLTAGE CAN
CAUSE EQUIPMENT DAMAGE.
Once the ATS equipment has been installed and wired, perform
the initial mechanical and electrical procedures as outlined in Sec-
tion 6 to verify that the equipment is installed and operating
properly.
4.6 Engine Start Connection
The engine control contact connections are located on the logic
panel of the ATS. Connect the engine start wires to the red ter-
minal blocks. See the drawings for the switch. A contact closes
between these terminal when an engine start signal is provided
by the ATS logic. The wiring diagram provides additional engine
start connection information. Use the proper wire size as listed
by the generator set (Genset) manufacturer
For the I/O connections, there are some switches that the Inputs
are wired to a terminal block while others are not. When they are
not, the terminal blocks on the controller are simply used, see
Figure 13A. The switch and listed terminal blocks are shown
below.
1200A D frame Inputs/Gen Start to terminal blocks
The I/O module is shown in Figure 13B. More on both devices
can be found in the ATC-900 instruction booklet.
NOTICE
PRIOR TO MAKING THE ENGINE START CONNECTION TO THE
SWITCH, SET THE ENGINE GENERATOR CONTROLS SELECTOR
SWITCH IN THE OFF POSITION TO PREVENT AN UNWANTED
ENGINE START. CONTROL WIRING, SUCH AS THE ENGINE START
WIRES, MUST BE RUN IN A SEPARATE CONDUIT FROM THE
POWER CABLES.
