Eaton ATC-900 Operation And Maintenance Manual - page 16
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IB140064EN
Instructional Booklet
Page 16
Effective: April 2018
Operation and Maintenance Manual, Automatic Transfer Switch, Bypass Isolation,
Contactor Type, Open/Closed Transition, ATC-900 Controller, 3000A Frame
Figure 19. 4 Pole Bus & Ground Bar Shown.
Proceed with the following steps:
Step 1: Verify that the line and load cables comply with applica-
ble electrical codes.
Step 2: Verify that the transfer switch rated current and voltage
(see identification plate on the door of the transfer
switch) agree with system current and voltage.
Step 3: After the transfer switch is mounted, provide the conduit
or cable openings as required. Ensure that no metal filings
contaminate the transfer switch components.
Step 4: Test all power cables before connecting them to the unit
to insure that the conductors or the cable insulation have
not been damaged while being pulled into position.
Step 5: Carefully strip the insulation from the power cables.
Avoid nicking or ringing of the conductor strands. Pre-
pare the stripped conductor termination end by cleaning
it with a wire brush.
Step 6: Make the necessary connections of any options using the
wiring diagrams supplied with the unit.
Power cables are to be connected to solderless screw type lugs
located on the transfer switch switching devices. Refer to the
separate Customer Wiring Diagrams supplied with the transfer
switch equipment for power termination. Verify that the lugs sup-
plied will accommodate the power cables being used. Also verify
that the cables comply with local electrical codes. Standard trans-
fer switch equipment, as supplied from the factory, will accommo-
date the wire sizes shown in Table3. Compression lugs are
available as an option.
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.
Table 3. Wire Size for Available Power Cable
Connections.
.
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.
DANGER
POWER CONDUCTORS MAY HAVE VOLTAGE PRESENT THAT CAN
CAUSE SEVERE PERSONAL INJURY OR DEATH. DE-ENERGIZE ALL
POWER AND CONTROL CIRCUIT CONDUCTORS (FIGURE 19) TO BE
CONNECTED TO THE TRANSFER SWITCH EQUIPMENT BEFORE INITI-
ATING WORK WITH THE CONDUCTORS AND/OR TERMINATING
THEM TO THE EQUIPMENT. ALWAYS VERIFY THAT NO VOLATGE IS
PRESENT ON THE EQUIPMENT PRIOR TO SERVICING. CONSULT
NFPA 70E AND OSHA GUIDELINES FOR OPERATOR SAFETY PRIOR
TO SERVICING EQUIPMENT.
CAUTION
USE OF CABLE LUGS NOT DESIGNED FOR THE TRANSFER SWITCH
APPLICATIONS MAY CAUSE HEATING PROBLEMS.
CAUTION
TO HELP PREVENT COMPONENT DAMAGE OR FUTURE MALFUNC-
TIONS, USE EXTREME CARE TO KEEP CONTAMINANTS OUT OF THE
TRANSFER SWITCH EQUIPMENT WHEN MAKING POWER CABLE
CONNECTIONS.
Ground Bar
LOAD
S1
S2
AMPS
MAX # OF
CONDUCTORS
TERMINAL SIZE
TORQUE FT-LB (NM)
1600-
8
1/0-750 CU/AL
32 (42)
2600-3000
12
1/0-750 CU/AL
32 (42)
WARNING
POWER CONDUCTORS AND CONTROL WIRING MAY HAVE VOLT-
AGE PRESENT THAT CAN CAUSE SEVERE PERSONAL INJURY OR
DEATH. DEENERGIZE ALL POWER AND CONTROL CIRCUIT CON-
DUCTORS BEFORE BEGINNING TO PERFORM ANY WIRING ACTIVITY
TO OR WITHIN THE ATS EQUIPMENT. ALWAYS VERIFY THAT NO
VOLTAGE IS PRESENT ON EQUIPMENT PRIOR TO SERVICING.
WHILE ENERGIZED, AN ARC FLASH AND SHOKC HAZARD EXISTS.
CONSULT NFPA 70E AND OSHA GUIDELINES FOR OPERATOR
SAFETY PRIOR TO SERVICING, INSPECTING OR OPERATING EQUIP-
MENT.
CAUTION
ENSURE THE ATS VOLTAGE IS SET CORRECTLY ON THE TRANS-
FORMER PANEL. IT SHOULD BE THE SAME AS THE SOURCE 1 AND
SOURCE 2 LINE VOLTAGES. OPERATING THE EQUIPMENT ON
IMPROPER VOLTAGE CAN CAUSE EQUIPMENT DAMAGE.