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O & M Manual for the CHGENLC Automatic
Transfer Switch with ATC-100 Control
Note: If you are replacing the contactor in a 100A or 200A SE ATS, the
service entrance breaker must be reinstalled at this time. Also reconnect
the jumpers between the generator breaker (inside the ATS) and the E1, E2
terminals on the generator (Source 2) side of the contactor. Follow Steps 5
through 10 in Section 7.4.1.9 (for 100A & 200A Service Entrance breaker)
and Step 8 in Section 7.4.1.10 (for 100A & 200A generator breaker).
Step 8: Apply utility (Source 1) power and place the generator
control selector switch in the "AUTO" position after the
service entrance breaker has been replaced. Test the
system for proper functionality.
7.4.1.6 Wiring Harness
Figure 33. Wiring Harness Installed in a CHGENLC ATS.
Step 1: Turn the utility (Source 1) power off and turn the genera-
tor (Source 2) control selector switch to the "OFF" posi-
tion before attempting to replace the wiring harness.
Step 2: Use a small blade screwdriver to release the locks then
remove the generator engine start wires from the engine
start contacts (tan terminal block).
Step 3: Remove the two (2) screws securing the engine start
contacts to the base plate using a blade screwdriver or
0.25 in. socket or nut driver.
Step 4: Note their location then disconnect the red wires from the
contactor (see Figure 32).
Note: All wires connected to the contactor are labeled to ease identifica-
tion.
Note: If the load shed option has been installed in the ATS, DO NOT
remove the red wire running from the load shed to the auxiliary switch on
the right side of the contactor.
IB00405002E
E COIL 1
Figure 34. Wires to Disconnect from the Contactor.
Step 5: Disconnect the P1, P2, P4, P5, and P7 plugs from the
Step 6: Disconnect the white wire connected to the neutral bar.
Note: If an optional load shed and/or TVSS is installed in the 100 A ATS,
the screw securing the white wire to the neutral bar is also used to secure
the red load shed wire. The red load shed wire and/or TVSS white wire
will have to be reattached to the neutral bar when the white wire in the
new wiring harness is connected to the neutral bar later in this process.
Note: If an optional load shed and/or TVSS is installed in a 200 A standard
or SE ATS, the female flag connector is also used to connect the red load
shed wire and white TVSS wire to the neutral bar. Cut the red load shed
and white TVSS wires as close to the connector as possible. They will be
reconnected later in this process.
The wire harness is now free to be removed.
For more information visit: www.eaton.com
Effective: August 2007
N COIL 1
N COIL 2
N AUX COM
N AUX N.O.
E COIL 2
controller (see Figure 27).
On 100 A ATS, use a blade screwdriver to remove the
screw securing the white wire's ring terminal to the neu-
tral bar (see Figure 36).
On 200 A standard and SE ATSs, remove the white wire
from the flag connector on the neutral bar (see Figure 36).
Instructional Booklet
Page 25
N1
N2
E AUX N.O.
E AUX COM
E2
E1
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