Introduction; Safety Precautions; Product Overview - Eaton ATC-300 Mode D'emploi

Instruction Booklet
Page 2 Effective: January 2006
CAUTION
THE ATC-300 CONTROLLER IS FACTORY PROGRAMMED FOR A
SPECIFIC AUTOMATIC TRANSFER SWITCH. DO NOT ATTEMPT
TO INTERCHANGE ATC-300 CONTROL DEVICES WITHOUT CON-
SULTING EATON ELECTRICAL.
All possible contingencies that may arise during installation,
operation, or maintenance, and all details and variations of
this equipment do no purport to be covered by these instruc-
tions. If further information is desired by the purchaser
regarding a particular installation, operation, or maintenance
of particular equipment, please contact an authorized EATON
Sales Representative or the installing contractor.
SECTION 1: INTRODUCTION
1.1 Preliminary Comments and Safety
Precautions
This technical document is intended to cover most aspects
associated with the installation, application, operation, and
maintenance of the Automatic Transfer Controller (ATC)-300
Controller. It is provided as a guide for authorized and quali-
fied personnel only in the selection and application of the
ATC-300 Controller. 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 particular
installation, application, or maintenance activity, please con-
tact an authorized EATON sales representative or the install-
ing contractor.
1.1.1 Warranty and Liability Information
No warranties, expressed or implied, including warranties of
fitness for a particular purpose of merchantability, or warran-
ties arising 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 negli-
gence), 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 equip-
ment, 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 result-
ing 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 mainte-
nance of this device.
WARNING
THE WARNINGS AND CAUTIONS INCLUDED AS PART OF THE
PROCEDURAL STEPS IN THIS DOCUMENT ARE FOR PERSONNEL
SAFETY AND PROTECTION OF EQUIPMENT FROM DAMAGE. AN
EXAMPLE OF A TYPICAL WARNING LABEL HEADING IS SHOWN
ABOVE TO FAMILIARIZE PERSONNEL WITH THE STYLE OF PRE-
SENTATION. 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.
ATC-300 Automatic
Transfer Switch
Controller
COMPLETELY READ AND UNDERSTAND THE MATERIAL PRE-
SENTED IN THIS DOCUMENT BEFORE ATTEMPTING INSTALLA-
TION, OPERATION, OR APPLICATION OF THE EQUIPMENT. IN
ADDITION, ONLY QUALIFIED PERSONS SHOULD BE PERMITTED
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.
1.2 Background
Transfer switches are used to protect critical electrical loads
against loss of power. The load's Source 1 power source is
backed up by a Source 2 power source. A transfer switch is
connected to both the Source 1 and Source 2 power sources
and supplies the load with power from one of the two
sources. In the event that power is lost from Source 1, the
transfer switch transfers the load to the Source 2 power
source. This transfer can be automatic or manual, depending
upon the type of transfer switch equipment being used.
Once Source 1 power is restored, the load is automatically or
manually transferred back to the Source 1 power source,
again depending upon the type of transfer equipment being
used.
In automatic transfer switch (ATS) equipment, the switch's
intelligence system initiates the transfer when the Source 1
power falls below or rises above a preset voltage or fre-
quency. If the Source 2 power source is a standby generator,
the ATS initiates generator start up then transfers to the
Source 2 power source when sufficient generator voltage is
available. When Source 1 power is restored, the ATS auto-
matically transfers back to the Source 1 power source and
initiates generator engine shutdown.
An ATS consist of three basic elements:
1. Main contacts to connect and disconnect the load to and
2. A mechanism to transfer the main contacts from source
3. Intelligence/supervisory circuits to constantly monitor the
This manual deals with the third basic element of the ATS,
the required intelligence/supervisory circuits. Earlier ATSs
were controlled by relay logic type or a solid-state, single
board controllers. In either case, the control panel consisted
of a number of individually mounted and wired devices offer-
ing a limited amount of system flexibility, especially in the
case of the relay logic design. The ATC-300 Controller
advances the application of intelligence, supervisory, and pro-
gramming capabilities for ATS equipment.

1.3 Product Overview

The ATC-300 Controller is a comprehensive, multi-function,
microprocessor based ATS controller. It is a compact, self-
contained, panel mounted device designed to replace tradi-
tional relay and solid-state logic panels.
For more information visit: www.eatonelectrical.com
CAUTION
from the power sources.
to source.
condition of the power sources and thus provide the
intelligence necessary for the switch and related circuit
operation.
IB01602001T