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IB00405002E
Instructional Booklet
Page
6
Effective: August 2007
O & M Manual for the CHGENLC Automatic
Transfer Switch with ATC-100 Control
SECTION 3: EQUIPMENT DESCRIPTION
3.1 Introduction
The Eaton Residential ATS is assembled and tested at the factory.
It is designed to be used in conjunction with standby power distri-
bution equipment to provide an alternate source of power to criti-
cal circuits in the event that the primary power source is
interrupted.
This ATS monitors both utility and generator power sources and
automatically transfers critical load circuits between the two
sources, depending on which source is available. The utility
power source is preferred and will remain connected to the switch
if it is available.
3.2 Power Panel
The power panel is used for making load, power, and neutral con-
nections. The power contactor is mounted on a steel baseplate
(Figure 6).
3.2.1 Main Contacts
This ATS incorporates a power contactor. The main contacts con-
nect and disconnect the load to and from the different power
sources. The power contactor is mechanically and electrically
interlocked to prevent the two sets of main contacts from being
closed simultaneously.
Figure 6. Typical Power Panel for 100 A Model.
3.3 ATC-100 Logic Panel
The ATC-100 is a microprocessor-based transfer switch logic con-
trol package. The hardware and software of the controller contain
the intelligence/supervisory circuits that constantly monitor the
condition of the power sources. It provides the intelligence neces-
sary for the operation of the ATS (Figure 7).
Figure 7. ATC-100 Logic Control Panel.
The ATC-100 controller has an operating temperature of
-20 to 70°C (-4 to 158°F).
The controller circuit board is protected by an insulating conformal
coating.
The specifications, under normal operating conditions, are as fol-
lows:
•
Tolerance for voltage sensing function: ±1% of full scale
•
Tolerance for frequency sensing function: ±0.3 Hz of setting
3.4 CHGENLC ATS Features
A variety of standard and optional features are available for Eaton
ATSs.
All features or combinations of features may not be avail-
able on specific ATSs
. All features and/or accessories are Under-
writers Laboratories (UL) listed unless noted.
3.4.1 Standard Features
The following is a list of the standard features for the ATC-100
Controlled ATS.
1.
Time Delay Normal to Emergency (TDNE)
This feature provides a time delay when transferring from the
Utility to the Generator power source. Timing begins when
the Generator becomes available. It permits controlled trans-
fer of the load circuit to the Generator.
Jumper selectable at 2 seconds or 15 seconds.
