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Instruction Booklet IB0162064EN
Effective January 2014
O & M Manual for the EGS Service
Entrance Automatic Transfer Switch
Eaton Corporation www.eatoncanada.ca
Section 3: Equipment Description
3.1 Introduction
The Eaton metered, service entrance rated ATS is assembled and
tested at the factory. It is designed to be used in conjunction with
standby power distribution equipment to provide an alternate source
of power to critical circuits in the event that the primary power
source is interrupted.
The Advanced ATS with RTC100 control 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 con-
nected to the switch if it is available. The Relay ATS relies on the
Generator Controller to monitor utility and generator power, and sig-
nals the relay to control ATS position.
3.2 Service Disconnect
The Service Entrance (SE) section of the ATS is used for making the
primary utility power, and neutral connections. Factory cabling from
the load side of the main circuit breaker service disconnect connects
to the utility lugs of the power contactor assembly.
(Figure 6).
3.2.1 Main Contacts
This ATS incorporates a power contactor. The main contacts connect
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 simultane-
ously.
Figure 4. Typical Advanced 200 Ampere Interior Assembly.
3.3 RTC-100 Logic Panel on EGSCA100ASE and
EGSCA200ASE
The RTC-100 is a microprocessor-based transfer switch logic control
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 necessary for the
operation of the ATS. Please refer to IB 70-8698 for complete
details.
The RTC-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
follows:
• Tolerance for voltage sensing function: ±1% of full scale
• Tolerance for frequency sensing function: ±0.3 Hz of setting
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