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IIB01602019E
Instructional Booklet
Page
2
Effective: March 2010
O&M Manual for the Eaton ATC-100
Automatic Transfer Switch Controller
Section1: Introduction
All possible contingencies that may arise during installation, opera-
tion, or maintenance, and all details and variations of this equip-
ment do no purport to be covered by these instructions. If further
information is desired by the purchaser regarding an installation,
operation, or maintenance of particular equipment, please contact
an authorized Eaton Electrical Sales Representative or the install-
ing contractor.
1.1 Preliminary Comments and Safety Precautions
This technical document is intended to cover most aspects associ-
ated with the installation, application, operation, and maintenance
of the Automatic Transfer Controller (ATC-100). It is provided as
a guide for authorized and qualified personnel only in the selection
and application of the ATC-100. Please refer to the specific
WARNING and CAUTION in Section 1.1.2 before proceeding. If
further information is required by the purchaser regarding a partic-
ular installation, application, or maintenance activity, please con-
tact an authorized Eaton, Electrical sales representative or the
installing contractor.
1.1.1 Warranty and Liability Information
No warranties, expressed or implied, including warranties of fit-
ness for a particular purpose of merchantability, or warranties aris-
ing from course of dealing or usage of trade, are made regarding
the information, recommendations and descriptions contained
herein. In no event will Eaton be responsible to the purchaser or
user in contract, in tort (including negligence), strict liability or
otherwise for any special, indirect, incidental or consequential
damage or loss whatsoever, including but not limited to damage or
loss of use of equipment, plant or power system, cost of capital,
loss of power, additional expenses in the use of existing power
facilities, or claims against the purchaser or user by its customers
resulting from the use of the information and descriptions con-
tained herein.
1.1.2 Safety Precautions
All safety codes, safety standards, and/or regulations must be
strictly observed in the installation, operation, and maintenance of
this device.
1.2 Background
Transfer switches are used to protect critical electrical loads
against loss of power. The load’s utility power source is backed
up by a generator power source. A transfer switch is connected
to both the utility and generator power sources and supplies the
load with power from one of the two sources. In the event that
power is lost from the utility, the transfer switch transfers the
load to the generator power source. Once utility power is
restored, the load is automatically transferred back to the utility
power source.
In Automatic Transfer Switch (ATS) equipment, the switch’s intel-
ligence system initiates the transfer when the utility power falls
below or rises above a preset voltage or frequency. The ATS ini-
tiates generator start up then transfers to the generator power
source when sufficient generator voltage is available. When utility
power is restored, the ATS automatically transfers back to the
utility power source and initiates generator engine shutdown.
An ATS consists of three basic elements:
1. Main contacts to connect and disconnect the load to and from
the power sources.
2. A mechanism to transfer the main contacts from source to
source.
3. Intelligence/supervisory circuits to constantly monitor the con-
dition of the power sources and thus provide the intelligence
necessary for the switch and related circuit operation.
This manual deals with the third basic element of the ATS, the
required intelligence/supervisory circuits. Earlier ATSs were con-
trolled by relay logic type or a solid-state, single-board controllers.
In either case, the control panel consisted of a number of individu-
ally mounted and wired devices offering a limited amount of sys-
tem flexibility, especially in the case of the relay logic design. The
ATC-100 advances the application of intelligence, supervisory,
and programming capabilities for ATS equipment.
1.3 Product Overview
The ATC-100 is a comprehensive, multi-function, microprocessor
based ATS controller. It is a compact, self-contained, panel
mounted device designed to replace traditional relay and solid-
state logic panels.
Designed to meet the needs of markets worldwide, the ATC-100:
•
Is an Underwriters Laboratories (UL) recognized component
•
Complies with UL 1008/ Canadian Standards Association (CSA)
22.2-178
•
Complies with UL 991 environmental tests
•
Complies with International Electrotechnical Commission (IEC)
61000-4-2, 61000-4-3, 61000-4-4, 61000-4-5, 61000-4-6,
and 61000-4-11
CAUTION
THE ATC-100 CONTROLLER IS FACTORY PROGRAMMED FOR A
SPECIFIC AUTOMATIC TRANSFER SWITCH. DO NOT ATTEMPT TO
INTERCHANGE ATC-100 CONTROL DEVICES WITHOUT CONSULT-
ING EATON ELECTRICAL, INC.
WARNING
THE WARNINGS AND CAUTIONS INCLUDED AS PART OF THE PRO-
CEDURAL STEPS IN THIS DOCUMENT ARE FOR PERSONNEL SAFETY
AND PROTECTION OF THE EQUIPMENT FROM DAMAGE. AN EXAM-
PLE OF A TYPICAL WARNING HEADING IS SHOWN ABOVE TO
FAMILIARIZE PERSONNEL WITH THE STYLE OF PRESENTATION.
THIS WILL HELP TO INSURE THAT PERSONNEL ARE ALERT TO
WARNINGS, WHICH APPEAR THROUGHOUT THE DOCUMENT. IN
ADDITION, WARNINGS AND CAUTIONS ARE ALL UPPER CASE AND
BOLDFACE.
WARNING
COMPLETELY READ AND UNDERSTAND THE MATERIAL PRE-
SENTED IN THIS DOCUMENT BEFORE ATTEMPTING INSTALLATION,
APPLICATION, OPERATION, OR MAINTENANCE OF THE EQUIP-
MENT. IN ADDITION, ONLY QUALIFIED PERSONS SHOULD BE PER-
MITTED TO PERFORM ANY WORK ASSOCIATED WITH THIS
EQUIPMENT. ANY WIRING INSTRUCTIONS PRESENTED IN THIS
DOCUMENT MUST BE FOLLOWED PRECISELY. FAILURE TO DO SO
COULD CAUSE PERMANENT EQUIPMENT DAMAGE.
