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IB140024EN
Instruction Booklet
Page
16
Effective: October 2014
ATC-300/900 40-400A (480/600Vac)
3-Postion Contactor Based Transfer Switch
4.4 Power Cable Connections
WARNING
POWER CONDUCTORS MAY HAVE VOLTAGE PRESENT THAT CAN
CAUSE SEVERE PERSONAL INJURY OR DEATH. DE-ENERGIZE ALL
POWER OR CONTROL CIRCUIT CONDUCTORS TO BE CONNECTED
TO THE ATS EQUIPMENT BEFORE BEGINNING TO WORK WITH THE
CONDUCTORS AND/OR TERMINATING THEM TO THE EQUIPMENT.
CAUTION
USE OF CABLE LUGS NOT DESIGNED FOR THE ATS MAY CAUSE
HEATING PROBLEMS.
CAUTION
TO HELP PREVENT COMPONENT DAMAGE OR FUTURE MALFUNC-
TIONS, USE EXTREME CARE TO KEEP CONTAMINANTS OUT OF
THE ATS EQUIPMENT WHEN MAKING POWER CABLE CONNEC-
TIONS.
CAUTION
RUN THE POWER CABLE THROUGH THE GUTTER SPACE PROVIDED
TO THE RIGHT OR LEFT OF POWER PANEL.
Test all power cables prior to connection to the unit to ensure
that the conductors or cable insulation have not been damaged
while being pulled into position.
Power cables are to be connected to solderless screw type lugs
located on the ATS switching devices. Refer to the separate Cus-
tomer Wiring Booklet supplied with the ATS equipment for power
termination. Verify that the lugs supplied will accommodate the
power cables being used. Also verify that the cables comply with
local electrical codes. Standard ATS equipment, as supplied from
the factory, will accommodate the wire sizes shown in Table 4.
Carefully strip the insulation from the power cables to avoid nick-
ing or ringing of the conductor strands. Prepare the stripped con-
ductor termination end by cleaning it with a wire brush. If
aluminum conductors are used, apply an appropriate joint com-
pound to the clean conductor surface area.
WARNING
IMPROPER POWER CABLE CONNECTIONS CAN CAUSE EXCESSIVE
HEAT AND SUBSEQUENT EQUIPMENT FAILURE.
Tighten the cable lugs to the torque identified on the label affixed
to the door of the unit.
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 Book-
let 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 prop-
erly.
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 terminals
marked 13 and 14 on J-5 connector on the ATC-300+ Controller
(see Figure 12). The ATC-900's engine starts (S2 only) are wired
to red terminal blocks. These terminal blocks are for a N.O. type.
IF N.C. are required, one must wire directly to the controller to
terminal block connector J15. Please see switch drawings. A
contact closes between these terminal when an engine start sig-
nal 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.
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.
Table 4. Transfer Switch Equipment Wire Sizes
TRANSFER SWITCH AMPERE RATING
WIRE SIZE RANGES
NUMBER OF CABLES PER PHASE
TERMINAL TEMPERATURE RATING °C (°F)
100
#14-3/0
1
90(194)*
200
#6-300 KCMIL
1
90(194)*
400
1/0-750
1
90(194)*
400
1/0-250
2
90(194)*
* Cable must be 90C rated but the size shall be determined based on the ampacity of the wire rated at 75C.
