I.B. ATS-SD02
Page 1
Effective 5/98
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 transfer switch equipment
with ratings from 600 through 4000 amperes, except for
the specific logic used to control the equipment. It is pro-
vided as a guide for authorized and qualified personnel
only. Please refer to the specific WARNING and CAU-
TION in Section 1.1.2 before proceeding. If further infor-
mation is required by the purchaser regarding a particu-
lar installation, application or maintenance activity, a
Cutler-Hammer representative should be contacted. For
information associated with the control, refer to the sep-
arate instruction book pertaining to the logic package
installed in the switch.
1.1.1 WARRANTY AND LIABILITY INFORMATION
No warranties, expressed or implied, including war-
ranties of fitness for a particular purpose of merchant-
ability, or warranties arising from course of dealing or
usage of trade, are made regarding the information, rec-
ommendations and descriptions contained herein. In no
event will Cutler-Hammer be responsible to the purchas-
er 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 facili-
ties, or claims against the purchaser or user by its cus-
tomers resulting from the use of the information and
descriptions contained 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.
THE WARNINGS AND CAUTIONS INCLUDED AS
PART OF THE PROCEDURAL STEPS IN THIS DOCU-
MENT ARE FOR PERSONNEL SAFETY AND PRO-
TECTION OF EQUIPMENT FROM DAMAGE. AN
EXAMPLE OF A TYPICAL WARNING LABEL HEAD-
ING IS SHOWN ABOVE TO FAMILIARIZE PERSON-
NEL WITH THE STYLE OF PRESENTATION. THIS
WILL HELP TO INSURE THAT PERSONNEL ARE
ALERT TO WARNINGS, WHICH APPEAR THROUGH-
OUT THE DOCUMENT. IN ADDITION, CAUTIONS
ARE ALL UPPER CASE AND BOLDFACE.
COMPLETELY READ AND UNDERSTAND THE MATE-
RIAL PRESENTED IN THIS DOCUMENT BEFORE
ATTEMPTING INSTALLATION, OPERATION OR
APPLICATION OF THE EQUIPMENT. IN ADDITION,
ONLY QUALIFIED PERSONS SHOULD BE PERMIT-
TED TO PERFORM ANY WORK ASSOCIATED WITH
THE EQUIPMENT. ANY WIRING INSTRUCTIONS PRE-
SENTED IN THIS DOCUMENT MUST BE FOLLOWED
PRECISELY. FAILURE TO DO SO COULD CAUSE
PERMANENT EQUIPMENT DAMAGE.
1.2 GENERAL INFORMATION
Transfer switches are used to protect critical electrical
loads against loss of power. The load’s normal power
source is backed up by a secondary (emergency) power
source. A transfer switch is connected to both the nor-
mal and emergency power sources and supplies the
load with power from one of these two sources. In the
event that power is lost from the normal power source,
the transfer switch transfers the load to the secondary
(emergency) power source. Transfer can be automatic
or manual, depending upon the type of transfer switch
equipment being used. Once normal power is restored,
the load is automatically or manually transferred back to
the normal power source, again depending upon the
type of transfer equipment being used (Figure 1-1).
In automatic transfer switch equipment, the switch’s
intelligence system initiates the transfer when normal
power fails or falls below a preset voltage. If the emer-
gency power source is a standby generator, the transfer
switch initiates generator starting and transfers to the
emergency power source when sufficient generator volt-
age is available. When normal power is restored, the
transfer switch automatically transfers back and initiates
engine shutdown. In the event the normal power source
fails and the emergency power source does not appear,
the automatic transfer switch remains connected to the
normal power source until the emergency power source
does appear. Conversely, if connected to the emer-
gency power source and the emergency power source
fails while the normal power source is still unavailable,
the automatic transfer switch remains connected to the
emergency power source.
!
WARNING
!
CAUTION
Summary of Contents for ATVISPE31000XSU
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