Ats _ Rthefda20100wsu _ Cutler-hammer _ 5715b77 _ Eaton

8/13/2019 Ats _ Rthefda20100wsu _ Cutler-hammer _ 5715b77 _ Eaton

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I. B. ATS-RT03

Effective March, 1999 Supersedes I.B. ATS-RT02 dated October, 1998

Cutler-Hammer

Instructions for Cutler-Hammer ResidentialAutomatic Transfer Switch


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All possible contingencies which may arise during installation, operation or maintenance, and all details andvariations of this equipment do no purport to be covered by these instructions. If further information is

desired by purchaser regarding his particular installation, operation or maintenance of particular equipment,contact a Cutler-Hammer representative.

READ AND UNDERSTAND THE INSTRUCTIONSCONTAINED HEREINAFTER BEFORE ATTEMPTINGTO UNPACK, ASSEMBLE, OPERATE OR MAINTAINTHIS EQUIPMENT.

HAZARDOUS VOLTAGES ARE PRESENT INSIDETRANSFER SWITCH ENCLOSURES THAT CANCAUSE DEATH OR SEVERE PERSONAL INJURY.FOLLOW PROPER INSTALLATION, OPERATIONAND MAINTENANCE PROCEDURES TO AVOIDTHESE VOLTAGES.

! WARNINGTRANSFER SWITCH EQUIPMENT COVERED BYTHIS INSTRUCTION BOOK IS DESIGNED AND TEST-ED TO OPERATE WITHIN ITS NAMEPLATE RAT-INGS. OPERATION OUTSIDE OF THESE RATINGSMAY CAUSE THE EQUIPMENT TO FAIL RESULTINGIN DEATH, SERIOUS BODILY INJURY AND/ORPROPERTY DAMAGE. ALL RESPONSIBLE PERSONNEL SHOULD LOCATE THE DOOR MOUNTEDEQUIPMENT NAMEPLATE AND BE FAMILIAR WITHTHE INFORMATION PROVIDED ON THE NAME-PLATE. A TYPICAL EQUIPMENT NAMEPLATE ISSHOWN IN FIGURE 1.

Figure 1 Typical Automatic Transfer Switch Equipment Nameplate

Cutler-Hammer

Automatic Transfer Switch

E

Cat No: RTHEFDA20100WSU 9/95

GO No: 1/1Item: 1

Poles: 2 Amps: 100 Volt: 240

Phase: 1 Hertz: 60 Wire: 3


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TABLE OF CONTENTS

Page

SECTION 1: INTRODUCTION

1.1 Preliminary Comments and Safety Precautions..................................................................................................11.1.1 Warranty and Liability Information..........................................................................................................11.1.2 Safety Precautions .................................................................................................................................1

1.2 General Information.............................................................................................................................................11.2.1 Design Configuration..............................................................................................................................2

1.3 Transfer Switch Catalog Number Identification ...................................................................................................2

SECTION 2: RECEIVING, HANDLING AND STORAGE

2.1 Receiving.............................................................................................................................................................42.2 Handling ..............................................................................................................................................................4

2.3 Storage ...............................................................................................................................................................4

SECTION 3: EQUIPMENT DESCRIPTION

3.1 Introduction..........................................................................................................................................................53.2 Options ...............................................................................................................................................................53.3 Standards ............................................................................................................................................................5

SECTION 4: INSTALLATION AND WIRING

4.1 General ...............................................................................................................................................................74.2 Mounting Location ...............................................................................................................................................7

4.3 Mounting Procedure ............................................................................................................................................84.4 Power Cable Connections ..................................................................................................................................84.5 Wiring ..................................................................................................................................................................94.6 Installation ...........................................................................................................................................................94.7 Engine Start Connection .....................................................................................................................................94.8 Preliminary Checks .............................................................................................................................................9

SECTION 5: FUNCTIONAL TESTING

5.1 Preliminary Checks ...........................................................................................................................................125.2 Energize the Switch...........................................................................................................................................125.3 Operational Checks...........................................................................................................................................12

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Page

SECTION 6: TESTING AND PROBLEM SOLVING

6.1 General .............................................................................................................................................................136.2 Plant Exerciser Timer ........................................................................................................................................13

6.2.1 Timer Programming..............................................................................................................................136.3 Timing Delays....................................................................................................................................................13

SECTION 7: MAINTENANCE

7.1 Introduction........................................................................................................................................................147.2 Procedures ........................................................................................................................................................14


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SECTION 1: INTRODUCTION

1.1 PRELIMINARY COMMENTS AND SAFETYPRECAUTIONS

This technical document is intended to cover mostaspects associated with the installation, application,operation and maintenance of the Residential AutomaticTransfer Switch. It is provided as a guide for authorizedand qualified personnel only. Please refer to the specificWARNING and CAUTION in Section 1.1.2 before pro-ceeding. If further information is required by the pur-chaser regarding a particular installation, application ormaintenance activity, a Cutler-Hammer representativeshould be contacted.

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 orusage of trade, are made regarding the information, rec-ommendations and descriptions contained herein. In noevent will Cutler-Hammer be responsible to the purchas-er or user in contract, in tort (including negligence), strictliability or otherwise for any special, indirect, incidentalor consequential damage or loss whatsoever, includingbut 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 regulationsmust be strictly observed in the installation, operationand 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. ANEXAMPLE OF A TYPICAL WARNING LABEL HEAD-ING IS SHOWN ABOVE TO FAMILIARIZE PERSON-NEL WITH THE STYLE OF PRESENTATION. THISWILL HELP TO INSURE THAT PERSONNEL AREALERT TO WARNINGS, WHICH APPEAR THROUGH-OUT THE DOCUMENT. IN ADDITION, CAUTIONSARE ALL UPPER CASE AND BOLDFACE.

COMPLETELY READ AND UNDERSTAND THE MATE-

RIAL PRESENTED IN THIS DOCUMENT BEFOREATTEMPTING INSTALLATION, OPERATION ORAPPLICATION OF THE EQUIPMENT. IN ADDITION,ONLY QUALIFIED PERSONS SHOULD BE PERMIT-TED TO PERFORM ANY WORK ASSOCIATED WITHTHE EQUIPMENT. ANY WIRING INSTRUCTIONS PRE-SENTED IN THIS DOCUMENT MUST BE FOLLOWEDPRECISELY. FAILURE TO DO SO COULD CAUSEPERMANENT EQUIPMENT DAMAGE.

1.2 GENERAL INFORMATION

Transfer switches are used to protect critical electricalloads against loss of power. The loads normal powersource is backed up by a secondary (emergency) powersource. A transfer switch is connected to both the nor-mal and emergency power sources and supplies theload with power from one of these two sources. In theevent that power is lost from the normal power source,the transfer switch transfers the load to the secondary(emergency) power source. Transfer can be automaticor manual, depending upon the type of transfer switchequipment being used. Once normal power is restored,the load is automatically or manually transferred back to

! WARNING

! CAUTION

Figure 1-1 Typical Load Transfer Switch (circuit break-er type) Schematic

Normal

Source

EmergencySource

Load


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the normal power source, again depending upon thetype of transfer equipment being used (Figure 1-1).

In automatic transfer switch equipment, the switchsintelligence 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 transferswitch initiates generator starting and transfers to theemergency power source when sufficient generator volt-age is available. When normal power is restored, thetransfer switch automatically transfers back and initiatesengine shutdown. In the event the normal power sourcefails and the emergency power source does not appear,the automatic transfer switch remains connected to thenormal power source until the emergency power sourcedoes appear. Conversely, if connected to the emer-gency power source and the emergency power sourcefails while the normal power source is still unavailable,the automatic transfer switch remains connected to theemergency power source.

Automatic transfer switches automatically perform thetransfer function, and include three basic elements:

(1) Main contacts to connect and disconnect the load

to and from the source of power.

(2) A mechanism to make the transfer of the main con-

tacts from source to source.

(3) Intelligence/supervisory circuits to constantly moni-

tor the condition of the power sources and thus pro-

vide the intelligence necessary for the switch and

related circuit operation.

1.2.1 DESIGN CONFIGURATION

The Cutler-Hammer transfer switch is a rugged, com-pact design that utilizes molded case switches to trans-

fer essential loads from one power source to another(Figure 1-2). Molded case switches are interlocked toprevent both switches from being closed at the sametime.

Mounting the enclosure is simple using top and bottommounting flanges with elongated mounting holes.

1.3 TRANSFER SWITCH CATALOG NUMBER IDEN-TIFICATION

Transfer switch equipment catalog numbers provide asignificant amount of relevant information pertaining to aspecific piece of equipment. The Catalog NumberIdentification Table (Table 1.1) provides the requiredinterpretation information. An example is offered to ini-tially simplify the process.

Example: Catalog Number (circled numbers correspondto position headings in Table 1.1)

Positions 1-2 Position 3 Position 4 Positions 5-6

Basic Switching Device Control SwitchingDevice Orientation Panel Device

Residential RT Horizontal H Electromechanical E HFD Cutler-Hammer Series C FD

Position 7 Position 8 Positions 9-12 Position 13 Position 14 Position 15

Switching Device Number Ampere Voltage/Arrangement of Poles Rating Frequency Enclosure Listing

Fixed Mount Molded Case A Two 2 30A 0030 120VAC/60Hz A NEMA 1 S UL Listed U

Switches Three 3 70A 0070 208VAC/60Hz B NEMA 3R R

100A 0100 240VAC/60Hz W

150A 0150

200A 0200

Table 1.1 Transfer Switch Catalog Number Explanation

to to to

RT H E FD A 3 0100 B S U

12 13 14 15

Only available with 120 or 240 volt systems (60 Hz Only) Only available with 208 volt systems (60 Hz Only)


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The catalog number RTHEFDA30100BSU describes anautomatic transfer switch with the switching devicesmounted horizontally in the enclosure. The intelligencerepresented by the control panel is electromechanical

logic. The frame is for 100 amp service, and the switchis a 3-pole, fixed mount molded case switch. The contin-uous current rating of this equipment is 100 amperesand applicable at 208 VAC, 60Hz. The transfer switchequipment is enclosed in a NEMA 1 enclosure and list-ed for UL applications.

Figure 1-2 Typical Residential Automatic TransferSwitch (30-150A)


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SECTION 2: RECEIVING, HANDLING, ANDSTORAGE

2.1 RECEIVING

Every effort is made to ensure that the transfer switchequipment arrives at its destination undamaged andready for installation. Packing is designed to protectinternal components as well as the enclosure. Careshould be exercised, however, to protect the equipmentfrom impact at all times. Do not remove protective pack-aging until the equipment is ready for installation .

When transfer switch equipment reaches its destination,the customer should inspect the shipping container forany obvious signs of rough handling and/ or externaldamage that occurred during transportation. Record anyexternal and internal damage for reporting to the trans-

portation carrier and Cutler-Hammer, once a thoroughinspection is complete. All claims should be as specificas possible and include Shop Order and General Ordernumbers.

A shipping label affixed to the shipping containerincludes a variety of equipment and customer informa-tion, such as General Order number and CustomerNumber. Make certain that this information matchesother shipping paper information.

Each transfer switch enclosure is bolted through its topand bottom mounting flanges to a rigid wooden pallet.The pallet is open at two ends for movement by a fork-

lift. Heavy duty cardboard sides surround the enclosureand are further supported with reinforced cardboard cor-ner posts. An egg crate design cardboard protector cov-ers the entire top of the enclosure with additional card-board protectors over the indicating light panel andoperating handle. A heavy duty cardboard lid covers theentire opening. The shipment is secured and further pro-tected with shrink wrap. Do not discard the packingmaterial until the equipment is ready for installation.

Once the top packaging is removed from the shipment,the enclosure door can be opened. A plastic bag of doc-uments will be found in the enclosure, usually attachedto the inside of the door. Important documents, such astest reports, wiring diagrams, appropriate instructionleaflets and a warranty registration card, are enclosedwithin the bag and should be filed in a safe place.

2.2 HANDLING

As previously mentioned, transfer switch equipment ispackaged for forklift movement. Protect the equipmentfrom impact at all times and do not double stack. Oncethe equipment is in the installation location and ready tobe installed, packaging material can be removed. Oncethe enclosure is unbolted from the wooden pallet, it canbe hand moved to its installation position. Be careful notto damage the top or bottom enclosure mounting

flanges. Refer to Section 4 of this manual for specificinstallation instructions.

2.3 STORAGE

Although well packaged, this equipment is not suitablefor storage outdoors. The equipment warranty will notbe applicable if there is evidence of outdoor storage. Ifthe equipment is to be stored indoors for any period oftime, it should be stored with its protective packagingmaterial in place. Protect the equipment at all times fromexcessive moisture, construction dirt, corrosive condi-tions, and other contaminants. It is strongly suggestedthat the package-protected equipment be stored in a cli-

mate-controlled environment of -20C to 65C with a rel-ative humidity of 80 percent or less. Do not under anycircumstance, stack other equipment on top of a transferswitch equipment enclosure, whether packaged or not.


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SECTION 3: EQUIPMENT DESCRIPTION

3.1 INTRODUCTION

The Cutler-Hammer Residential Automatic TransferSwitch is assembled and tested at the factory. It isdesigned to be used in conjunction with standby powerdistribution equipment to provide an alternate source ofpower to critical circuits in the event that a primarypower source is interrupted.

This switch monitors both normal and standby powersources and automatically transfers critical load circuitsbetween the two sources depending upon which sourceis available. The normal source is preferred and willremain connected to the switch if it is available.

3.2 OPTIONS

A variety of switch options are available to meet a widevariety of application requirements. Individual options oroption combinations permit a switch to be tailored toindividual needs. Options are numbered with an associ-ated description. More detailed selections that must bemade within a specific option are lettered.

1. Time Delay Normal to Emergency (TDNE)

This option delays the transfer from the normal powersource to the emergency power source in order to over-ride momentary normal power source outages and/orfluctuations. Timing begins when the emergency powersource becomes available. It does not affect initiation ofthe engine start circuit. Should the normal power sourcefail, the engine start contact will immediately close and,if connected to an engine generator, will initiate anengine start-up. The timer is user-adjustable from 3 sec-onds to 60 seconds. This option is labeled TDNE.

2. Time Delay on Engine Starting (TDES)

This option is used only where the emergency powersource is an engine generator. It delays initiation of theengine start circuit in order to override momentary nor-mal power source outages and/or fluctuations. It doesnot affect the ability of the transfer switch to transferfrom the normal power source to the emergency power

source. The timer is user adjustable from 0.5 seconds to15 seconds. This option is labeled TDES.

2B. Adjustable 0.5 to 15 seconds2C. Adjustable 4 to 120 seconds

3. Time Delay Emergency to Normal (TDEN)

This option delays transfer from the emergency powersource to the normal power source to allow the normal

power source to stabilize before the transfer is initiated.Timing begins when the normal source becomes avail-able. If the emergency power source fails during timing,the time delay is overridden and an immediate transferto the normal power source will occur. The timer is user-adjustable from 24 seconds to 480 seconds. Thisoption is labeled TDEN.

5D. Under Voltage Sensing for Emergency Source

This option enables the logic to constantly monitor theemergency power source. The logic prevents transferfrom normal power source to the emergency powersource until the emergency power source has reachedan acceptable operating voltage.

23. Plant Exerciser

A digital 7-day timer provides automatic testing at pre-selected intervals at least once each week.

23C. Without load interruption23D. By simulation of power failure

3.3 STANDARDS

Cutler-Hammer transfer switch equipment enclosed in aNEMA 1 enclosure is listed for application by UL andUL-C. In addition, Cutler-Hammer automatic transferswitches are listed in File E38116 by UnderwritersLaboratories, Inc. under Standard UL 1008. This stan-dard covers requirements for automatic transfer switch-es intended for use in ordinary locations to provide light-ing and power as follows:

a. In emergency systems, in accordance with articles517 and 700 in the National Electrical Code,ANSI/NFPA 70 and the National Fire ProtectionAssociation No. 76A and/or

b. In standby systems, in accordance with article 702of the National Electrical Code and/or

c. In legally required standby systems in accordancewith article 701 of the National Electrical Code.

Cutler-Hammer automatic transfer switches are avail-able to meet NFPA110 for emergency and standbypower systems, and NFPA99 for health care facilitieswhen ordered with the appropriate options.

Since Cutler-Hammer automatic transfer switches usespecially designed molded case switches as the mainpower switching contacts, these devices must also belisted under the additional UL Standard 1087.Underwriters laboratories uses two basic types of listingprograms label service and re-examination.


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UL1087 employ a label service listing program whichrequires an extensive follow-up testing program for list-ed devices. Standard UL1008 for automatic transferswitches lists devices under the reexamination programwhich only requires a continual physical reexamination

of the components used in the product to ensure consis-tency with the originally submitted device. Follow-uptesting is not required by UL1008.

Representative production samples of molded caseswitches and molded case circuit breakers used inCutler-Hammer automatic transfer switches are subject-ed to a complete test program identical to the originallysubmitted devices on an ongoing periodic basis per

UL1087. The frequency of such a re-submittal can be asoften as every quarter for a low ampere device. Any fail-ure during one of these periodic re-submittals couldresult in a loss of the valued UL listing mark.


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SECTION 4: INSTALLATION AND WIRING

4.1 GENERAL

Transfer switches are factory wired and tested.Installation requires solidly mounting the enclosed unitand connecting power cables and auxiliary pilot circuits.Physical mounting procedures and power cable connec-tions are covered in this section. Once a transfer switchis properly installed and wired, it should be mechanicallyand electrically checked for proper installation and oper-ation. The procedures for these initial mechanical andelectrical checks are outlined in Section 5 of this instruc-tion manual.

4.2 MOUNTING LOCATION

Choose a location that offers a flat, rigid mounting sur-face capable of supporting the weight of the enclosedtransfer switch equipment (Figure 4-1, 30-150A or

Figure 4-2, 200A). Avoid locations that are moist, hot, ordusty, however, there are enclosure designs availablefor special environments. If there are any doubts as tolocation suitability, discuss it with your Cutler-Hammerrepresentative.

Check to make certain that there are no pipes, wires, orother mounting hazards in the immediate mounting areathat could create a problem.

Figure 4-1 Dimensions and Plan View of ResidentialAutomatic Transfer Switch (30-150A)

Figure 4-2 Dimensions and Plan View of ResidentialAutomatic Transfer Switch (200A)

.078(2 mm) 4.84

(123 mm)

19.87 (0.5m)10.25 (0.26 m)

24.3

1(0.4

4m)

24.8

70.6

32m)

26

.62(0.6

8m)

8.3

5(212mm)

7.7

3(196mm)

.22 (6mm)

Front View Dimensions

Weight 90lbs. (41kg.)

1.25 (38mm)

Plan View Dimensions

.078(2 mm) 4.84

(123 mm)

19.87 (0.5m)10.25 (0.26 m)

27.3

1(0.6

9m)

27.8

7(0.7

07m)

29

.62(0.7

5m)

11.3

5(288mm)

10.7

3(211mm)

.22 (6mm)

Front View Dimensions

Weight 100 lbs. (46kg.)

1.25 (38mm)

Plan View Dimensions

26.6

2

0.6

8m)

29.6

2(0.7

5m)


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Carefully remove all packing material from the transferswitch at the mounting location. Even though an equip-ment inspection was made when the equipment wasreceived, make another careful inspection of the enclo-sure and the enclosed transfer switch as packing mater-ial is removed and the enclosure readied for mounting.Be especially alert for distorted metal, loose wires ordamaged components.

4.3 MOUNTING PROCEDURE

EXTREME CARE SHOULD BE TAKEN TO PROTECTTHE TRANSFER SWITCH FROM DRILL CHIPS, FIL-INGS AND OTHER CONTAMINANTS WHEN MAKINGTHE CABLE ENTRY HOLES AND MOUNTING THEENCLOSURE TO PREVENT COMPONENT DAMAGEOR A FUTURE MALFUNCTION .

With the enclosed transfer switch equipment unpackedand ready for mounting, proceed with these steps:

Step 1: The transfer switch enclosure door is hingemounted with removable hinge pins. To simpli-fy the mounting procedure and avoid damage,carefully remove the door and put it in a safeplace until mounting is complete.

Step 2: Install required mounting bolt anchors and the

two upper mounting bolts in the mounting sur-face.

Step 3: Gently lift the enclosure and guide theteardrop-shaped holes in the upper mountingflange over the upper mounting bolts, but donot completely tighten the bolts.

Step 4: While still supporting the enclosure, install thetwo lower mounting bolts in the lower mountingflange, but do not completely tighten. Useshims, if required, to prevent deformation of theenclosure when the mounting surface is distort-ed.

Step 5: Tighten all four mounting bolts after anyrequired shimming is completed.

Step 6: Double check to ensure that all packing andshipping material has been removed.

4.4 POWER CABLE CONNECTIONS

POWER CONDUCTORS MAY HAVE VOLTAGE PRE-SENT THAT CAN CAUSE SEVERE PERSONALINJURY OR DEATH. DE-ENERGIZE ALL POWER ORCONTROL CIRCUIT CONDUCTORS TO BE CON-NECTED TO THE TRANSFER SWITCH EQUIPMENTBEFORE BEGINNING TO WORK WITH THE CON-DUCTORS AND/OR TERMINATING THEM TO THEEQUIPMENT.

USE OF CABLE LUGS, NOT DESIGNED FOR THETRANSFER SWITCH MAY CAUSE HEATING PROB-LEMS. BREAKER LUGS ONLY MOUNT TO THEBREAKER, WHILE TRANSFER SWITCH LUGSMOUNT TO BOTH THE BREAKER AND THE BUS-BAR BEHIND THE BREAKER. FOR INSTALLATIONINSTRUCTIONS, REFER TO THE INSTRUCTIONLEAFLET SUPPLIED FOR THE SPECIFIC LUGS.

TO HELP PREVENT COMPONENT DAMAGE ORFUTURE MALFUNCTIONS, USE EXTREME CARE TOKEEP CONTAMINANTS OUT OF THE TRANSFERSWITCH EQUIPMENT WHEN MAKING POWERCABLE CONNECTIONS.

Test all power cables prior to connection to the unit toensure that conductors or cable insulation has not beendamaged while being pulled into position.

Power cables are to be connected to solderless screwtype lugs located on the transfer switch switchingdevices. Verify that the lugs supplied will accommodate

the power cables being used. Also verify that the cables

! WARNING

! CAUTION

Transfer Switch Number of

Amp Rating Wire Size Range Cables per Phase

30 - 150 #14 - 3/0 1

200 #6-300MCM 1

Table 4.1 Wire Size for Automatic Transfer Switch

! CAUTION

! CAUTION


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comply with local electrical codes. Standard transferswitch equipment, as supplied from the factory, willaccommodate the wire sizes shown in Table 4.1.

Carefully strip insulation from the power cables to avoid

nicking or ringing of the conductor strands. Prepare thestripped conductor termination end by cleaning it with awire brush. If aluminum conductors are used, apply anappropriate joint compound to the clean conductor sur-face area.

IMPROPER POWER CABLE CONNECTIONS CANCAUSE EXCESSIVE HEAT AND SUBSEQUENTEQUIPMENT FAILURE.

Tighten cable lugs to the torque identified on the labelaffixed to the unit immediately adjacent to the lugs.

4.5 WIRING

POWER CONDUCTORS AND CONTROL WIRINGMAY HAVE VOLTAGE PRESENT THAT CAN CAUSESEVERE PERSONAL INJURY OR DEATH. DE-ENER-GIZE ALL POWER OR CONTROL CIRCUIT CONDUC-TORS BEFORE BEGINNING TO PERFORM ANYWIRING ACTIVITY TO OR WITHIN THE TRANSFERSWITCH EQUIPMENT.

CHECK THE TRANSFER SWITCH EQUIPMENTNAMEPLATE FOR RATED VOLTAGE. IT SHOULD BETHE SAME AS THE NORMAL AND EMERGENCYLINE VOLTAGES. OPERATING THE EQUIPMENT ONIMPROPER VOLTAGE CAN CAUSE EQUIPMENTDAMAGE.

4.6 INSTALLATION

In a typical installation (Figure 4-3), the automatic transferswitch (ATS) (1) and the generator (2) are connected tothe residential power supply. The ATS (1) and emergencydistribution panel (3) receive normal power from a dedi-cated breaker in the utility service panel (4). The ATS andemergency panel receive emergency power from the gen-erator (2). Power from the utility feeds the utility panel.

When normal power fails, the ATS will sense the failure,start the generator, and switch all loads to the emergencypanel. All emergency loads will receive power from thegenerator. A line breaker is required between the emer-gency source (generator) and the transfer switch (Figure

4-4). When normal power returns, the ATS will switch allpower back to the utility and shut down the generator.

4.7 ENGINE START CONNECTION

The engine control contact connections are located onthe lower right of the intelligence portion of the ATS.NOTE: Prior to making the engine start connection tothe switch, set the engine generator controls selectorswitch in the OFF position to prevent an unwantedengine start. Connect the engine start wires to the redterminal blocks marked 51 and 52. A contact closesbetween these terminal blocks when an engine start signal is provided by the ATS logic. The wiring diagram(Figure 7-1) provides additional engine start connectioninformation.

4.8 PRELIMINARY CHECKS

After the ATS enclosure is installed and power cablesare connected to the equipment, thoroughly inspect theunit to ensure that no tools were left inside and that thecabinet is free of debris. If necessary, use a vacuumcleaner to remove any and all construction or installationdebris from the equipment.

Read and understand all labels on the equipment.Review and understand the wiring diagrams suppliedwith the equipment. Note any optional accessories thatmay have been furnished with this unit and review theiroperation.

Verify that the phase-to-phase line voltages of both thenormal and emergency power sources are the sameand that they match rated voltage as indicated on theATS ratings label.

SEVERE EQUIPMENT DAMAGE CAN RESULT IFUNIT IS NOT APPLIED AT PROPER VOLTAGE.DO NOT ENERGIZE EQUIPMENT IF SUPPLY VOLT-AGES DO NOT MATCH EQUIPMENT RATINGSLABEL. CONTACT THE FACTORY FOR INSTRUC-TIONS TO MODIFY THE VOLTAGE RATING IN THEFIELD.

! CAUTION

! CAUTION

! WARNING

! CAUTION


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Figure 4-3 Typical installation of a residential or light duty automatic transfer switch. The switch (1) and generator (2)are connected to the power supply. The automatic transfer switch is located between the emergency distribution (3)and the utility panel (4)


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Figure 4-4 Diagram of Typical Installation


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5.3 OPERATIONAL CHECKS

Step 1: Open the upstream normal breaker originallyclosed in Step 2 of Section 5.2.

This will simulate an interruption of the normalpower source.

Step 2: After a brief time delay (if the ATS is equippedwith Time Delay Engine Start option), thestandby engine generator will start.

Step 3: If supplied, the ATS Time Delay Normal toEmergency (TDNE) will begin to time after theengine begins to run and the emergency volt-age relay picks up (if supplied). After time out(or instantaneously if no TDNE is supplied), themotorized transfer mechanism will engage andautomatically switch from the NORMAL toEMERGENCY position.

Step 4: Using a voltmeter, measure line-to-line andline-to-neutral voltages across the emergencyline terminals to ensure that the emergencyvoltage is correct. If necessary, make adjust-ments to the voltage regulator on the generatoraccording to the manufacturers recommenda-tions to correct any voltage deviations. The

ATS will only respond to correct voltage fromthe emergency source.

Step 5: Close the normal breaker described in Step 1.

Step 6: If supplied, the ATS Time Delay Emergency toNormal (TDEN) relay will begin timing after atime-out (or instantaneously if no TDEN is sup-plied), and the motorized transfer mechanismwill engage and automatically switch from theEMERGENCY to NORMAL position and thegenerator will shut down.

Although not offered as an option on this ATS,some engine generator controls may be equippedwith a Time Delay Engine Cool-Off feature thatkeeps the engine running for a pre-set time aftertransfer to normal. Contact the generator manufac-turer for verification.

SECTION 5: FUNCTIONAL TESTING

YOU ARE READY TO ENERGIZE THE EQUIPMENT.VOLTAGES WITHIN THE ENCLOSURE ARE CAPA-BLE OF CAUSING SEVERE PERSONAL INJURY ORDEATH.

USE EXTREME CAUTION TO AVOID CONTACTWITH ENERGIZED EQUIPMENT.

5.1 PRELIMINARY CHECKS

Step 1: Pre-set all time delays (as supplied) as noted inthe adjustment instruction (Section 6).

Step 2: Check all loads connected the ATS to ensurethat they are ready to be energized.

5.2 ENERGIZE THE SWITCH

Step 1: Close the upstream normal source breaker orswitch to connect the ATS to the normal sourcevoltage.

Step 2: If the ATS unit is not already in the NORMALposition, the motorized transfer mechanism willengage and automatically switch to the NOR-MAL position.

Step 3: Using a voltmeter, measure line-to-line andline-to-neutral voltages across the normal lineterminals to ensure normal voltage is correct.

CONTACT WITH ENERGIZED COMPONENTS WILLCAUSE ELECTRICAL SHOCK CAPABLE OF PRO-DUCING SEVERE PERSONAL INJURY OR DEATH.USE EXTREME CAUTION TO AVOID CONTACTWITH ENERGIZED COMPONENTS WHEN USING A

METER FOR VOLTAGE CHECKS.

Step 4: Position the engine control selector switchlocated on the standby engine generator to theAUTOSTART position. (It may also be labeledREMOTE START.)

Step 5: Close the upstream emergency source breakeror switch to connect the ATS to the emergencysupply source.

NOTICE

NOTICE

! WARNING

! WARNING


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SECTION 6: ADJUSTMENTS

6.1 GENERAL

Certain devices, such as the sensing relays and timers,need to be set and/or calibrated prior to placing thetransfer switch equipment into service. The devices fur-nished with the equipment will be the same or similar tothose described in this section. Adjustments should bemade as instructed for the devices supplied.

6.2 PLANT EXERCISER TIMER

Option 23, described in Section 3.5, is a plant exerciser.The plant exerciser is a 7-day timer switch used to exer-cise the engine driven generator.

6.2.1 TIMER PROGRAMMING

The FM/1 digi 20 incorporates a 7-day time base, per-mitting each day of the week to be uniquely pro-grammed (Figure 6-1). For convenience, BlockProgramming is also provided. This allows up to sevendays to be grouped together if the ON and OFF timesare the same. The timer displays in AM/PM format.When setting the hours, attention must be given towhether it is AM or PM.

After power-up, press the Reset button before set-

ting the time or programming. This will clear thememory of all data from testing and handling.

6.3 TIMING DELAYS

Agastat Time Delay Relays used on Options 1, 2B, 2C,and 3 are adjustable by rotating the dial or via screw-driver adjustment pots (Figure 6-2).

NOTICE

Figure 6-1 Plant Exerciser Timer

Figure 6-2 Panel-mounted Timing Relay


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SECTION 7: MAINTENANCE

7.1 INTRODUCTION

HIGH VOLTAGES ARE PRESENT IN AND AROUNDTRANSFER SWITCH EQUIPMENT. BEFOREINSPECTING OR MAINTAINING THIS EQUIPMENT,DISCONNECT LINE POWER FROM THE EQUIPMENTBEING SERVICED BY OPENING AND LOCKINGOUT, IF POSSIBLE, THE NEXT HIGHEST DISCON-NECT DEVICE. FAILURE TO FOLLOW THIS PROCE-DURE COULD CAUSE PERSONAL INJURY AND/ORDEATH.

In general, transfer switch equipment is designed to berelatively maintenance free under normal usage.However, because of the variability of application condi-tions and the importance placed on dependable opera-tion by this type of equipment, inspection and mainte-

nance checks should be made on a regularly scheduledbasis. Since equipment maintenance will consist mainlyof keeping the equipment clean, the frequency of main-tenance will depend, to a large extent, on the cleanli-ness of the surroundings. If a significant amount of dust

or foreign matter is present, a more frequent mainte-nance schedule should be followed.

It is suggested that visual inspections of the equipmentbe made on a regular basis, not just during regularlyscheduled periods. Always be alert for an accumulationof dirt in and around the structure, loose parts and/orhardware, cracks and/or discoloration to insulation, anddamaged or discolored components.

Figures 7-1 and 7-2 are the wiring diagrams for the res-idential automatic transfer switch. Only qualified andexperienced personnel should attempt any diagnosticwork using this diagram.

7.2 PROCEDURES

A suggested maintenance procedure to follow is out-lined in Table 7.1.

! WARNING


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Figure 7-1 Wiring Diagram for Residential Automatic Transfer Switch - 120 VAC Applications


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Figure 7-2 Wiring Diagram for Residential Automatic Transfer Switch - Applications 208-240 VAC


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Table 7.1 Periodic Maintenance Procedures

a. Make transfer switch equipment safe for Disconnect line power from equipment being serviced by

inspection and/or maintenance. opening next highest disconnect device. Make certain thatany accessory control power is switched off.

b. Inspect structure area for safety hazards or Inspect area, especially where molded case switchingpotential maintenance problems. devices are installed, for any safety hazards, including

personnel safety and fire hazards. Exposure to certainchemical vapors can cause deterioration of electricalconnections.

Inspect for accumulated dirt, loose hardware or physicaldamage.

Examine primary insulation for evidence of cracking oroverheating. Overheating will show as discoloration,

melting, or blistering of conductor insulation, or as pittingor melting of conductor surfaces due to arcing.

Inspect secondary control connections for damage, andcontrol wiring for insulation integrity.

c. Inspect molded case switching devices for dust, Remove dust, dirt, soot, grease, moisture and corrosiondirt, soot, grease, moisture or corrosion. contamination from the surface of the switching device

using a dry soft lint-free cloth, dry soft bristle brush andvacuum cleaner. Do not blow debris into circuit breaker ornearby breaker structure. If contamination is found, look forthe source and fix the problem.

d. Check for material integrity, uneven wear, Severe material cracking will require replacement anddiscoloration or loose hardware. loose hardware will need to be tightened.

e. Check terminals and connectors for looseness Overheating will show as discoloration, melting, oror signs of overheating. blistering of conductor insulation.

Connections that do not have signs of looseness oroverheating should not be disturbed.

f. Exercise the molded case switching devices If a switching device is used for frequent switching duringif they are not often exercised while in normal operation, this step can be disregarded.operation. This will permit wiping action by thecontacts.

g. Return transfer switch equipment to service. Make certain all barriers are in place and doors closed.Re-apply secondary and primary power.

Step Action


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I. B. ATS-RT03

Cutler-HammerMoon Township, Pennsylvania U.S.A.

This instruction booklet is published solely for informa-tion purposes and should not be considered all inclu-

sive. If further information is required, you should con-sult Cutler-Hammer.

Sale of product shown in this literature is subject to

terms and conditions outlined in appropriate Cutler-Hammer selling policies or other contractual agreementbetween the parties. This literature is not intended to

and does not enlarge or add to any such contract. Thesole source governing the rights and remedies of any

purchaser of this equipment is the contract between thepurchaser and Cutler-Hammer.

NO WARRANTIES, EXPRESSED OR IMPLIED,INCLUDING WARRANTIES OF FITNESS FOR A PAR-

TICULAR PURPOSE OR MERCHANTABILITY, OR

WARRANTIES ARISING FROM COURSE OF DEAL-ING OR USAGE OF TRADE, ARE MADE REGARDINGTHE INFORMATION, RECOMMENDATIONS AND

DESCRIPTIONS CONTAINED HEREIN. In no eventwill Cutler-Hammer be responsible to the purchaser oruser in contract, in tort (including negligence), strict lia-

bility or otherwise for any special, indirect, incidental orconsequential damage or loss whatsoever, including but

not limited to damage or loss of use of equipment, plantor power system, cost of capital, loss of power, addition-

al expenses in the use of existing power facilities, orclaims against the purchaser or user by its customersresulting from the use of the information, recommenda-

tions and description contained herein.

Ats _ Rthefda20100wsu _ Cutler-hammer _ 5715b77 _ Eaton

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