7000 Series ATS Brochure 3158 R4

7/22/2019 7000 Series ATS Brochure 3158 R4

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Power Switching & Controlsfor Business-Critical Continuit

ASCO 7000 S ERIES Power Transfer Switch

World-Class Technology For Business-Critical Applications



Selecting Business-CriticalPower Transfer Switches

1

It’s time to rediscover performance benchmarks and designinnovations that separate power transfer switches

Life safety, nancialloss, productivity, valuableinformation and conve-nience all are at stake whenpower fails. Time is money,so time without power isunacceptable because it cancripple an organization’soperations.

No matter what type ofpower source is selected forbackup power protection,a reliable electrical deviceis needed to automaticallysense the unacceptability ofthe primary power sourceand transfer the load to thesecondary.

Although the backuppower source may befunctional only when theprimary source fails, thetransfer switch is the onlylink between the two powersources. So the automatictransfer switch is the “brain”of the power distribution

system and is always carry-ing power to crucial loads,regardless of which powersource is feeding the load.

Because so much hangsin the balance, there is noroom for error. Making theright decision is the onlyoption.

But what decision is theright one? That depends ona number of factors.

All transfer switches arenot created equally.

There are importantdifferences that need to beweighed and new sophisti-cated power transfer switchtechnology that requiresconsideration.

Even if you feel you

are up to speed on transferswitches, it’s time to lookagain because the stakesare so high.

Be certain you aremaking the right decisionon such a critical matter asemergency and standbypower. Then have peace ofmind knowing you selectedthe best products in theindustry to protect a facility.

THE DECISIONS YOU

MAKE ON POWER

TRANSFER SWITCHES FOR

PROTECTING YOUR

BUSINESS-CRITICAL

OPERATIONS WILL

AFFECT T HOSE

OPERATIONS FOR 20 OR

MORE YEARS



Consider 13 points for performance and reliability.THEY’RE WHAT DA TA ,

FINANCIAL AND

TELECOMMUNICATIONS

CENTERS, HEALTHCARE

FACILITIES AND OTHER

OPERATIONS NEED

2

Would you put yourreputation on the line with

just any automatic powertransfer switch?

Shouldn’t you dependon one with componentsdesigned specically fortransfer switch duty? Or onewith components designedfor other applications?

The design of each andevery part in the productdetermines how reliably apower transfer switch trans-

fers power. It also deter-mines reliability of specicfunctions, such as makingand breaking electrical con-nections, extinguishing arcsand others.

Every component ofASCO 7000 Series PowerTransfer Switches has beendesigned for one purpose.They have ASCO’s reputa-tion for legendary reliabilitybuilt into every transfer

switch. They have stoodthe test of time and are thebenchmarks for today’s

power transfer technology,

as justied by their eldproven performance.Thirteen points of

differentiation separatesuperior power transferswitches from all others.The points are:•Providing fast, consistent

and dependable powertransfer

• Preserving power contactintegrity and performance

• Extinguishing arcs safely

and quickly• Withstanding and closing

on fault currents• Overlapping switched

neutral poles• Designing quality and

dependable componentsintelligently

• Controlling operation

Every component andassembly, such as the transferswitch assembly on the right,has been designed exclusivelyfor automatic power transferswitch duty.

• Transferring motor loads

without abnormal inrushcurrents•Providing the connection

strategy for the needs ofthe load

Open Transition Transfer – In phase – Delayed transition Closed Transition Transfer – High speed transfer – Soft Load transition

transfer• Meeting or exceed-

ing minimum coderequirements

• Capitalizing on innovativetechnology.

• Employing remote com-munications capability

• Providing 24/7 serviceand maintenance

Important information to help you

make the right decision...

ASCO doesn’t generate power, it controls,distributes, transfers, monitors, measures,manages, displays, maintains, services andcommunicates with it.



Transferring Power

The heart of all ASCOtransfer switches is thesingle solenoid operator,unique in the transferswitch industry. Time andagain, it provides repeat-able, fast, true double-throw operation.

The operator has aproven track record for

simplicity, dependabilityand easy maintainabilitybecause it has no motors,gears or complicatedmechanisms.

Its design ensures thatloads will never be un-intentionally transferredto a dead or inadequatesource as the solenoid ispowered from the sourceto which the load is beingtransferred. The positiveinterlocking design helpskeep the main contacts

closed during short circuitconditions. Its true,double throw design en-sures crucial loads are not

connected to both powersources at the same time.

Importantly, thesolenoid is never fusedas some operators are.Fusing can render thetransfer switch inoper-able, an obviously undesir-able feature for businesscritical uses.

Requires a dependable mechanism.

3

ASCO designed and com-mercialized the first solenoidoperated transfer switch.



PreservingContact Integrity

And PerformanceBetween dissimilar power sources.

Transfer switches areresponsible for transferringloads between dissimilarpower sources that could beas much as 180o apart.

ASCO transfer switchesmanage this task withcontacts designed speci-

cally for transfer switch dutyby ASCO engineers. Thecontacts are not adaptedfrom other devices, such ascircuit breakers, contactorsor motor starters.

This dedicated designapproach has produced acontact that solves the spe-cial demands of transferringcritical loads reliably timeafter time.

Main contact alloy

composition is specicallyselected from a silver alloy.The alloy provides optimum

contact integrity, highconductivity to the maincontacts, and endurance tocarry the full load continu-ously and still be capableof enduring damagingoverloads and short circuitcurrents. The alloy also

prevents excessive tempera-ture rise that can deterio-rate insulation and cause abreakdown.

Separate arcing con-tacts on transfer switchesrated 800 Amps and largerprotect the main contactsfrom arcing’s damagingeffects by making rst andbreaking last.

Smaller transferswitches are designed with

arc runners and arcing tipsto preserve main contactsurface integrity.

Segmented maincontacts are part of largertransfer switches forbusiness-critical applica-tions. Segmented contactsprovide multiple points toensure ample contact sur-face area and to minimize

heat rise.Contacts designed fordedicated transfer switchduty provide long-term,reliable operation. This hasbeen eld proven by thehundreds of thousandsof ASCO transfer switchproducts provided for in-stallation in emergency andstandby power systems.

THERE’S NOTHING QUITE

LIKE A TRANSFER SWITCH.

ITS PERFORMANCE

REQUIREMENTS ARE UNIQUE

IN EMERGENCY AND STANDBY

POWER SYSTEMS

ASCO-designed segmented contacts

4



Extinguishing Arcs

Prevents direct, source-to-source shorting.Heat damage to

contacts is one problem.Another is direct, source-to-source shorting if the arcis not extinguished beforethe switch closes in on thealternate source. This canresult in a source-to-sourceshort circuit, which can to-tally destroy transfer switchintegrity .

ASCO power transferswitches extinguish arcsusing an arc chute assem-bly specially designed fordouble-throw operation.The design moves the arc

away from the main con-tacts quickly and safelyby pulling it up into thechute assembly plates withmagnetic force created bythe current ow through thetransfer switch pole struc-ture. This also stretches andcools the arc, minimizingheat damage.

Consideration also must

be provided for extinguish-ing arcs at reduced loadcurrents. ASCO has theindustry’s widest arc gapbetween fully openedcontacts. A wide gap main-tains the transfer switch’slow-connect interruptingeffectiveness when it islightly loaded and magneticforces are not as strong.

Transfer switchesusing contacts designedfor other devices, such ascircuit breakers, have nar-rower gaps, since they aredesigned for interruptingcurrents in excess of theirfull load, continuous currentrating (not below their rat-ing).

ARCS CREATED WHEN

TRANSFERRING LOADS

FROM ONE SOURCE TO

ANOTHER CAN BECATASTROPHIC FOR

TRANSFER SWITCHES AND

THEIR BUSINESS-CRITICAL

LOADS

ASCO arc splitters

5

ASCO has the industry’swidest arc gap between fullyopened contacts.

Finite element analysisand 3-D computer models(above) create componentsthat are specifically designedfor transfer switch duty.Durability and reliability arebuilt in. See page 27 for moreinformation on ASCO designinnovations.



Withstanding And ClosingOn Fault Currents

Demands robust withstand and close-on ratings.Withstanding and clos-

ing on short circuit currentsrequire transfer switchesthat can manage extremelyhigh magnetic forces andthermal dynamics.

While circuit break-ers and fuses are designedto open on short circuitcurrents, power transferswitches must withstand

the short circuit currentuntil the over-current deviceclears the fault.

ASCO power transferswitches integrate technol-ogy that employs thosemagnetic forces on largerswitches. The forces closecontacts more tightly,rather than letting them‘blow off,’ or open, as acircuit breaker would do.

The power transferswitches use extremelypowerful solenoids andmechanical advantages tormly close on a fault andlock the contacts closed.

Contact material com-position, pole and contactgeometry, arcing contactdesign and the bulk of thecurrent-carrying parts all af-fect the ability of the powertransfer switch to withstand

and close-on the damagingeffects of high fault cur-rents.

ASCO employs a varietyof computer software mod-eling programs to deter-mine the optimal combina-tion of all these factors andcreate a superior transferswitch design.

ASCO design technology keep contacts closed

6

ASCO power transferswitches include a full rangeof withstand and close-onratings to accommodatea variety of over-currentdevices, such as circuitbreakers and fuses, and their

varying fault-clearing times.In fact, ASCO trans-fer switches provide theindustry’s most extensivesolution to all withstand andclose-on conditions. Ratingsaddress all applications—anybreaker ratings, specicbreaker, current-limitingfuses and short time ratings.

ASCO commercialized thefirst three cycle “any breakerwithstand and close-oncurrent rating capability.

Withstand and Close-On Ratings* (WCR) for ASCO 7000 Series Power Transfer Switches(150 - 4000 Amps)

ContinuousAmps

“Any”Breaker(3 cycle)

“Specic”Breaker

Short Time Rating @ 480V

Rating(RMS, SYM), A

Duration(Cycles)

150 - 600

800 -1200

1600 - 3000

4000

42,000

50,000

100,000

100,000

50,000

65,000

100,000

100,000

N/A

36,000

42,000

85,00065,000

—

18

18

830

*RMS Symmetrical Amp at 480 V



7

ASCO introduced thefirst true overlappingswitched neutral.

Overlapping

Switched Neutral Contact PolesProvide solutions

associated with

grounding of

separately

derived systems.

‘Overlapping’ is theoperative word.

ASCO’s overlappingswitched neutral design isall about timing. It makesbefore it breaks in advanceof the breaking of the mainand even arcing contacts.It’s a superior solution for anumber of problems:

• Incomplete sensing oftotal fault current due tomultiple paths.

• Load voltage imbalancesduring transfer that candamage sensitive elec-tronic equipment.

• Increasing neutral con-ductor impedance andrelated voltage andheating issues caused byswitching neutral currentswith conventional powerswitching poles.

• Arcing and consequentdeterioration of the con-tact surface on the neutral

pole.

As with conventionalfour pole power switch-ing, the ASCO overlappingswitched neutral has thesame full-load current, with-stand ratings as the phasecontacts. But the similaritiesend there.

Neutral switching con-tacts are not created equal.Those that do not overlapthe main pole contact op-eration cannot prevent neu-tral conductor interruption,even if they are ‘adjusted’ tomake before they break.

ASCO overlappingneutral poles are designed

to overlap. They are not amodication of a conven-tional pole design.

ASCO’s overlapping switched neutral



Designing Quality, DependableComponents Intel l igently

Simplifies installation, maintenance and testing.Designing transfer

switches from the groundup has enabled ASCO toengineer them for ease ofinstallation, maintenanceand testing.

All key components, forexample, can be inspectedor replaced from the front ofthe enclosure.

Crimp lugs, which are

frequently specied for datacenters where heat buildup may be an issue, have along barrel and two holes toprevent lugs from turning.They can be arranged in avariety of congurations,depending on point ofaccess and cabling require-ments.

Most special lug ar-rangements that typicallymay require a larger en-closure for other transferswitches usually can behoused in the standardASCO enclosure.

Front-replaceable maincontact assemblies repre-sent another industry-set-ting benchmark. Transfer

switches rated 800 Ampsand above facilitate main-tenance of the main andarcing contacts, withoutdisassembling or removingthe transfer switch from theenclosure.

In addition, a block ofeight sets of auxiliary con-tacts, to indicate transferswitch position, now arestandard on most ASCO7000 transfer switches.

Increasing use ofmolded parts continuesto help produce a morerobust transfer switch. Theircloser tolerances, increasedstrength and improveddimensional control com-bine to enhance qualityand reliability, and simplifymaintenance.

Cutouts in a molded

pole cover, for example,allow access to lug screws,eliminating the need to re-move the pole covers duringcable installation.

8



9 Synchroscope representation

Transferring Motor LoadsWith minimal dis ruption

to chiller drives and other loads.

Effective transfersolutions are needed tominimize large inrush cur-rent and associated torquedamage created when amotor, which becomes agenerator at the momentof transfer, connects witha live source that is outof phase with the discon-nected source.

Two to three cycle hotto hot transfer times inconjunction with in phase

transfer are needed tominimize large inrush cur-rent and associated torquedamage created whenthe motor is reconnectedat the completion of loadtransfer.

ASCO’s single solenoidmechanism provides thespeed and consistency toassure in phase transition.

Two transfer solu-tions—in-phase transfer

and closed transitiontransfer— both requirefast and consistent trans-fer times. ASCO’s uniquelydesigned solenoid opera-tor delivers the requiredand repeatable transferspeed time after time.They transfer potentiallyproblematic motor loadsreliably, and are the leastdisruptive power transfer

solutions.In-phase transfer mon-itors the phases of boththe normal and emer-gency power sources. It

transfers the motor whenthe two are approachingzero phase angle. No morethan normal inrush cur-rent ever occurs.

For the most demand-ing business-critical appli-cations, closed transitiontransfer is the ultimatesolution. It momentarilyparallels the two live syn-chronized sources duringhot-to-hot source trans-fers, using an overlapping

transfer technique on allswitching poles whicheliminates momentaryload interruptions.

Closed transitiontransfer is the only way

to mitigate transformermagnetizing inrush cur-rent on transfer. It is apassive transfer methodthat allows transfer onlywhen the two sources aresynchronized and withinspecific voltage and fre-quency differentials.

Soft load, closed tran-sition transfer also is avail-able when block loading of

the generator is a factor toactively control the enginegenerator and graduallyramp the load from onesource to another. Theresult: no load interrup-tion, no inrush current,thus, no risk to sensitiveequipment.

ASCO introduced the firstin-phase monitor on transferswitches and the first closed-transition transfer switch.

o



1

SelectingAutomatic Transfer Switches

Based on your need to:

•Transfer crucial loads safely,

reliably and seamlessly

•Ease loads from one power source

to another

•Have complete power transfer

monitoring and control

•Get ultimate power protection

•Manage single utility feeds

and emergency power

•Ensure continuous power by using

alternate power sources

What do you need in business critical powertransfer and load management? EmergencyPower? Peak Shaving? Prime Power? Load Priori-tization? ASCO 7000 Series Automatic TransferSwitches can satisfy your business-critical require-ments...whatever they are.

Select standard design, business-critical or highlycustom engineered power transfer solutions.

Review the capabilities of the transfer switches onthe following pages, then discuss with us whichof them best meets your onsite power systemrequirements.

The power is in your hands.

ASCO has installed more than 600,000 automatic transferswitches worldwide. No other manufacturer comes close.



A closed transitiontransfer switch (CTTS)operates in a make-before-break mode, providing bothsources are acceptable and

in synchronism.If the connected source

is unacceptable, powertransfer will occur in con-ventional non-overlapmode, or open transitiontransfer.

For CTTS, most utilitiesaccept 100 milliseconds(msec) as the maximumoverlap time during transfer.

Typically, it doesn’t exceed50 to 80 msec.

Prior to transfer in ei-ther direction, both sourcesare monitored by the CTTS,and, if the voltage differ-ence is less than ve percentand the frequency variationless than 0.2 Hz, the relativephase angle is monitored.

When the phase angledifference approaches with-in ve electrical degrees,the switch operates, a mo-mentary overlap occurs,and the load transfers withvirtually zero interruption.

The presence of criticalloads generally dictates theuse of an isochronous gov-ernor, because the enginegenerator output frequencyshould remain virtually

constant from no load to fullload.

Closed transition trans-fer not only makes testingunder load less objection-

able, it provides many otherbenets. Because there is noload interruption, there is noinrush current when trans-ferring large motors.

The inrush problemassociated with transfer-ring transformers also iseliminated with CTTS. In ad-dition, if a critical computerload is served by a static

uninterruptible power sup-ply (UPS) system, the UPSbatteries never cycle whena synchronized transferoccurs.

By eliminating —evena momentary—dischargeof the battery bank, the lifeof the battery is extended.Batteries are known to be amajor maintenance expensein a UPS system.

Another growing ap-plication of a CT TS is inDemand Side Management(DSM) programs. Many elec-tric utilities offer incentivesif a user reduces coincidentpeak demand when request-ed by the utility. Advancenotication is given to theDSM customer when peakshaving or peak demand

reduction is needed.

Because a CTTS mo-mentarily parallels theonsite generator with theutility during retransfer tonormal power, or duringtransfer and retransfer dur-ing generator testing andload shedding operations,utility approval is requiredfor each intended installa-tion. ASCO personnel areavailable to assist the cus-tomer during this approvalprocess.

T r a n s f e r r i n g P o w e rWithout InterruptionWith the ASCO Closed Transition

Transfer Switch. It offers a reliablesolution to the problem of power

interruption on hot-to-hot transfer.

ASCO 7000 Series Closed Transition Transfer Switch

ASCO pioneered the firstclosed transition transferswitch.



It enables loads thatare too large for the engine-generator to handle as asingle block to come online gradually. The standardclosed transition transferswitch applies its load in ablock when transferring tothe generator set.

So does the traditionalopen transition transferswitch. The effect of theblock loading is even greaterwith the open transitionswitch, since motors andtransformers have to be

reenergized.But, when the size of

the load is approximately80 percent or more of thegenerator capacity, and theindividual loads cannot bedivided and connected tosmaller, sequenced transferswitches, a soft load powertransfer switch can be used.

The soft load switch is

similar to a closed transitionswitch in that it parallels thesources during transfer, butthe soft load switch uses anextended parallel time toallow a generating loadingcontrol to ramp the loadfrom the utility source to thegenerator.

The difference is a softload transfer switch takesactive control of the enginegovernor and voltageregulator on the generatorand doesn’t just wait forsynchronization to occur.Because the sources areparalleled for an extendedperiod of time the ASCOSoft Load Power TransferSwitch contains all thenecessary protective func-tions for extended paralleloperation.

ASCO offers two ver-

sions of the soft load switch.One uses a UL 1008 listedclosed transition transferswitch, the other usescircuit breakers for systemswhere a service entrancerating or overcurrent pro-tection is necessary.

ASCO also offers a SoftLoad Interconnect System(SLIS), which gradually

ramps a specic amount ofpower from the connectedbus. This can be used duringpeak demand periods.

Eas ing Loa dsOn to the

Power SystemIs simple with the ASCO 7000 Series

Soft Load Power Transfer Switch.

ASCO developed the first

closed transition soft loadpower transfer switch quali-fied and listed to UL 1008.

ASCO 7000 Series Soft Load PowerTransfer Switch

A synchroscope representation on this Control Cen-ter screen shows the relative phase angle betweennormal and onsite power. Among other informa-



7000 Series Microprocessor Controller

Emission Standard - Group 1, Class AGeneric Immunity Standard, from which:

Electrostatic Discharge (ESD) ImmunityRadiated Electromagnetic Field ImmunityElectrical Fast Transient (EFT) Immunity

EN 55011:1991EN 50082-2:1995

EN 61000-4-2:1995ENV 50140:1993EN 61000-4-4:1995

Contr oll ing Transfer Operation sFour elements position ASCO as the leader

in control technology:

1. Microprocessor Controller

2. Control and Indicator Panel

3. Operational parameters

4. Power Manager

The ASCO 7000 Series Microprocessor Controllerallows easy access to dataand control of a range offunctions.

Intuitive, simple naviga-tion presents real time in-formation on power source,voltage, frequency, status,timing and diagnostics.

The controller automat-ically starts the engine and

controls load transfer in theevent the utility source failsor becomes unacceptable.

Operational settingsand features can be tailoredby the customer to a specicapplication using six-buttonprogramming and multi-language screen messages.

The microprocessorlogic board is separated andisolated from the powerboard to improve immunityto electrical noise and tohelp assure compliance with

rigorous transient suppres-sion standards noted below.

7000 Series Microprocessor Controller

7000 Series Microprocessor PowerAnd Logic PC Boards

M i c r o p r o c e s s o r Controller

ASCO introduced the firstmicroprocessor basedautomatic power transferswitch controller.



C o n t r o l and Indicator Panels

The ASCO 7000 Series Standard and CTTS User Controland Indicator Panels complement the microprocessor controller.

They provide at-a-glance operational status and push button control.

The Standard Con-trol and Indicator Panel comprises four industrialgrade LED indicators anda three-position selectorswitch for conventional two-position transfer switches.

Two green LEDs showwhen the transfer switch isconnected to normal source

power and whether normalsource is acceptable.Two red LEDs indicate

when the transfer switchis connected to the emer-gency source and whetheremergency source isacceptable.

Acceptability is deter-mined by the control panel’ssettings for voltage, fre-

14

CTTS User Control and Indicator PanelStandard User Control and Indicator Panel

quency, voltage unbalanceand phase sequence.

The three positions ofthe selector switch are:• Automatic, which main-

tains the normal position.• Test, a momentary posi-

tion simulating normalsource failure for testingthe system functionality.

• Reset Delay Bypass, also amomentary position thatbypasses transfer and re-transfer time delays.

The CTTS Control andIndicator Panel includesthe indicators and selec-tor switch of the standardpanel, plus two additionalred LEDs and three push-buttons that give the panelexpanded functionality.

One LED indicates whenthe pre-set Parallel Time has

been exceeded. In this case,controls automatically openemergency or normal maincontacts.

The other LED is a visualalarm that indicates Failureto Synchronize if time delaysettings are exceeded dur-ing closed transition trans-fer.

A red push button—Transfer Switch LockedOut—prevents transfer ineither direction, if extendedparallel time is exceeded.

An Alarm Reset pushbutton resets extended par-allel and failure to synchro-nize alarms.

A Closed Transition

Bypass push button allowstransfer between sources inan open transition mode.



Operational Parameters

Normal VoltageDropout...... 85% .408V

Pickup........ 90% .432VO.V. Trip.....110% .528V

Multiple source sensing capabilities, a variety of operational

parameters and exible time delay settings ensure personnel get the

information they need and that the onsite power system operates properly.

Voltage andFrequency Sensing• True RMS Voltage Sensing

with +/- 1% accuracy;Frequency SensingAccuracy is +/- 0.2%.

• Adjustable under and overvoltage sensing on normaland emergency sources.

• Adjustable under andover frequency sensing onnormal and emergency.

• Selectable settings: singleor three phase voltage.

• Sensing on normal andemergency; 50 or 60Hz.

• Phase sequencemonitoring for phasesensitive loads.

• Voltage unbalancemonitoring betweenphases.

Status and

Control Parameters• Output contact for

engine-start signals.• Output signals for remote

indication of normal andemergency sourceacceptability.

• Selection between “com-mit/no-commit” on trans-fer to emergency afterengine start and normalrestores before transfer.

• Advanced inphase trans-fer algorithm, whichautomatically measuresthe frequency differencebetween the two sourcesand initiates transfer atappropriate phase angleto minimize disturbanceswhen transferring motorloads.

• Event log displays 99logged events with thetime and date of theevent, event type and rea-son.

• Statistical ATS/Systemmonitoring data screenswhich provide:— Total number of ATS

transfers.

— Number of ATS trans-fers caused by powersource failure.

— Total number of daysATS has operated.

— Total number of hournormal and emergensources have beenavailable.

Time Delays• Engine start time delay• Emergency sourcestabilization time delayto ignore momentarytransients during initialgenerator set loading.

• Re-transfer to normal timedelay with two settings:

— Power failure mode.— Test mode.

• Unloaded running timedelay for engine cool down.• Pre- and post-transfersignal time delay forselective load disconnect

with a programmablebypass on source failures.• Fully programmableengine exerciser with sevenindependent routinesto exercise the engine-generator, with or withoutloads, every day, week, twoweeks or month.

• Alarm signals, logic andtime delays for use withclosed transition switches

—Insynch time.—Failure to synchronize—Extended parallel.

• Delayed transition loaddisconnect time delay.



The Power Manageruses digital signal process-ing technology to measurevoltage and current perphase, real, reactive andapparent power, andbidirectional energy.

All measurements canbe viewed locally with abacklit liquid crystal displayand/or displayed remotelywith ASCO POWERQUEST®

products.The Power Manager

measures three phasecurrents and a fourthcurrent input is availablefor measuring current inthe neutral conductor.

The Power Managerincludes one discrete inputfor transfer switch posi-tion, eight general-purposediscrete inputs, and fourrelay outputs for control-ling or monitoring external

devices.

Power Manager

The microprocessor-based ASCO Power Manager provides real time

measurements of single and three phase power systems.

Power Metering• Voltage:Line-Line: VAB, VBC, VCA,

VAVERAGE

Line-Neutral: VAN, VBN,VCN, VAVERAGE

• Frequency: 45.0 to 66.0Hz

• Current: IA, IB, IC, IAVERAGE

• Unbalance %: Voltage,AmpsR l P KW KW

• Reactive Power: KVARA,KVARB, KVARC, KVARNET

• Apparent Power: KVAA,KVAB, KVAC, KVANET

• Real Energy: KWHIMPORT,KWHEXPORT, KWHNET

• Reactive Energy:KVARHIMPORT,KVARHEXPORT, KVARHNET

• Power Factor: PFA, PFB,PFC, PFNET

ASCO debuted the first powermanager with embeddedI/O and kW command andcontrol.



G e t t i n g U l t i m a t ePower ProtectionEnsures 7/24 availability of your business-critical

onsite power system and the safety of maintenance

personnel and equipment.

What do you do whenyou need to service anautomatic transfer switchconnected to both availablepower sources?

When it is necessary totest, maintain and inspectan automatic transfer switchwithout interrupting power,ASCO offers an integrallymounted, two-way by-pass-isolation switch as an

added feature on automatictransfer bypass-isolationproducts.

Also called a main-tenance bypass switch, abypass-isolation switch en-ables the transfer switch tobe completely isolated fromthe power system and safelyserviced.

In addition, the transferswitch can be electricallytested without interruptingconnected loads by usingthe bypass and isolation

ASCO 7000 Series Bypass-Isolation Transfer Switch

ASCO commercialized thefirst automatic bypass-isolation transfer switchwith a drawout design for

serviceability.

The following keyelements of the transfer

switch and its operationare described on pages18-20:• Bypass sequence• Isolation procedure• Status panel

handle to isolate the trans-fer switch.

A benchmark featureof this transfer switch is au-tomatic secondary discon-nects for control circuits.The male and female endsseparate as the transferswitch drawout mechanismoperates.

This feature furthersimplies transfer switch re-moval and installation, andenhances operator safety.



Complete Isolation Moving the isolation switch handle to the OPEN

position opens all isolation contacts, isolating the ATS

from the rest of the system.No voltage is present at normal or emergencyinputs, load output, the control system, or any otherpoint on the transfer switch. The bypass switch nowcarries the entire load. The ATS can be safely inspect-ed, serviced and even removed from the cabinet. The bypass switch provides bypass and can be oper-ated as a manual backup transfer switch. Once theengine starts, move the bypass switch handle from thebypass to normal position to the bypass to emergencyposition.

When maintenance is completed, the switch can bereturned rst to the test position and then racked bacinto its normal connected position.

l h d

Bypass to theNormal Source

When the bypass switch handle is moved to thebypass-to-normal position (BP-NORM), the transferswitch contacts are shunted by the right-hand BPcontacts.

The ow of current then divides between thebypass and transfer contacts. This enables the trans-fer switch to be removed without even a momentaryinterruption of power to the load. Note the isolationcontacts are still in the closed position.

AutomaticTransfer Operation

With the bypass switch handle in the AUTO (au-tomatic) position and the isolation switch handle inthe CLOSED position, the unit will provide its intendedautomatic transfer operation. Both bypass contactsare open. The isolation switch contacts are closed.

Test PositionWhen the isolation switch handle is moved to the

TEST position, the isolation switch drawout contacts

associated with the load terminal are opened.The total load current now is carried by the bypasscontacts. The normal and emergency input termi-nals of the ATS are still connected to the normal andemergency sources through the remaining still-closedisolation stabs.

This permits the ATS to be electrically tested andoperated without interrupting power to the load. Notethat since the isolation contacts never break load cur-rent, they are not subject to arc erosion or burning.

Bypass-IsolationOperational Sequence

1 2

3 4



Key ComponentsOf Bypass-IsolationTransfer Switch

Monitor Transfer/Bypass Status Panel(see page 20)

Mechanical isolation status indicator

External, permanently attachedbypass handle, per UL 1008

Microprocessor controller

External, permanently attachedisolation handle, per 45.4 of UL 1008

Front-mounted lugs

Protective isolation barrier

Mechanical transfer switch indicators

Easy-on, easy-off molded cover

Upper and lower doors openand close independently

Quick-disconnect wiring

Self-aligning power jaws

Tabs for sliding out bypass rack



Another operator-friendly innovation is theTransfer/Bypass StatusPanel. It’s a one-line diagramof the transfer switch that

uses LED indicators to showoperational conditions.

The panel communi-cates at-a-glance informa-tion more quickly thanmultiple pilot lights and isan industry rst. Indicatedconditions are:• Bypass to normal• Bypass to emergency• Load connected to normal

• Load connected toemergency• Transfer switch in con-

• Transfer switch in isolatedposition

• Transfer switch not inautomatic

• Normal source available

• Emergency sourceavailable

• Load connectedThe panel also includes

an engine control switch andlamp test button. Opera-tors can manually start thegenerator if normal sourcepower fails while the transferswitch is in the isolate posi-tion.

The bypass switchthen can be used to manu-ally transfer the load to the

Monitor Transfer/Bypass StatusStatus panel provides at-a-glance information,

control circuits disconnect automatically during isolation.

Bypass and isolation controlsand operating instructions

A critical design innova-tion is a new bypass drawoutmechanism. It sets the stan-

dard for ease of operationfor no load break bypass andtransfer switch isolation.

The drawout mecha-nism produces high hori-zontal pull force with lowhandle torque. It’s based onASCO’s reliable and eld-proven four-bar linkageclaw design that connectsand isolates quickly. Perma-

nently attached bypass andisolation handles preventmisplacement and helpsimplify the procedure fordrawing out and reconnect-ing the transfer switch. Lift-ing handles facilitate easyswitch removal.

The isolation procedurecan be completed withoutopening enclosure doors.

Easy-to-understand instruc-tions printed on the enclo-sure door explain each step.

A protective safetybarrier between the powertransfer and bypass switchesis standard.

Mechanical indicatorslinked to the movement ofthe transfer switch show theswitch’s true position, even

if both power sources aredead and LEDs that indicatepower position are dark.This is especially useful dur-ing maintenance becauseit eliminates the need foroperators to remove themain contact pole covers tosee the contacts’ position.

Isolate Easily

Simple bypass procedure is the new standard.



The power transferswitch meets all Na-tional Electrical Coderequirements for installationat a facility’s main utilityservice entrance.

Service entrance ratedtransfer switches generally

are installed at facilities thathave a single utility feedand a single emergencypower source. A circuit

breaker serves as the servicedisconnect and links areprovided to disconnectboth neutral and groundconnections.

This product is UL 891listed. The transfer switchis UL 1008 listed and is

available up to 600V and4000A in standard, delayed,closed transition, softload, and bypass-isolationcongurations.

The ASCO 7000 Series Service Entrance Rated

Transfer Switch combines automatic power

switching with an overcurrent protected service

disconnect device on the utility source.

With a Service E ntrance Rated Transfer Switch.

ASCO 7000 Series Service Entrance Rated

Transfer Switch

Managin g SingleUtil i t y Feed sAnd Emergency Power

One line diagram of atypical service entrancerated transfer switch.It’s available with solid,switched or overlappingneutral poles.

2

1 GFCT - Ground Fault CurrentTransformer2 ATS - Automatic Transfer Switch

1

ASCO debuted the firsttrue service entrancetransfer switch thatintegrates the switchand service disconnect.



By using special controls for managing prime, emergency and standby power.

Critical loads are auto-matically transferred to therst alternate power sourcethat achieves acceptablevoltage and frequency. Thesecond alternate powersource then is shutdownautomatically after a timedelay and cool down period.

If the rst alternatepower source fails, the

second will be automaticallyrestarted and the load willbe transferred from the rstalternate power source tothe second alternate powersource. When normal poweris restored, the controlsautomatically retransfer theload to the utility source

The Three Source Trans-fer System can be furnished

in its own enclosure, or asa package with a standardtransfer switch.

The package can in-clude a separate enclosurefor each transfer switch, ora single enclosure housingboth transfer switches.

The ASCO 7000 Series

Three Source Transfer

System provides all

necessary controls

to start both primary

and secondary power

sources upon the loss

of the utility source.

Ensuring Power withMultiple Standby Sources

One line diagram of a typicalthree source power design.The three source transferswitch (ATS #2) automaticallyconnects to the power sourcethat achieves acceptable volt-age and frequency first.

22

Utility

ATS #2

Gen #1 Gen #2

ATS #1

FacilityLoads



Employing Remote

Communications CapabilityCan be efcient, economic and reliable.

That’s a frequentlyasked question.

The answer has manychallenging facets. Theyinclude remote monitor-ing and control. Seamlessintegration with buildingautomation systems. Reli-able, easily understood andreal time information. Auto-matic alerts that eliminate‘monitor watching.’

The solution is Web-enabled communicationsbased on open protocols.The benets are many fold.

Existing Ethernet orother infrastructures can be

used to practically eliminatecommunications wiring.Interfacing with legacysystems is easier because itminimizes costs for writingsoftware code.

No investment in hard-ware, software, or addition-al stafng is needed. Theentire emergency powersystem can be monitoredand controlled remotely,24/7.

The solution deliversthese capabilities to a desk-top computer, pager, fax, or

cell phone. The informationis straightforward, shrink-ing the time required todiagnose a situation.

When will thesecapabilities be available?They already are. The ASCO

WHAT’S THE MOST

EFFICIENT, ECONOMIC

AND RELIABLE DESIGN

FOR EMERGENCY POWER

COMMUNICATIONS?

POWERQUEST® monitor-ing and control system andASCO Thin Web server offer

every capability describedhere, and more. They deliverefciency, economy andreliability.

And they lead to oneinescapable conclusion. Ascommunications improve,so does the performance ofemergency power systems.

23

ASCO developed the firstcommunications and data-logging capability for trans-fer switches.

POWERQUEST® Monitoring and Control



24

When combined with

the ASCO CommunicationInterface Modules (Acc 72A,Acc 72E), the ASCO 5500Series Thin Web Server andthe ASCO 5200 Series PowerManager, as shown above,POWERQUEST® providesthe most comprehensive

Intranet and Internet com-

munication system formonitoring and controllingpower transfer switches andengine-generators.

The POWERQUEST®

communication systemallows multiple client ac-cess from local or remotelocations and enables

monitoring of up to 64

power transfer switches andeight engine-generators. Inaddition, automatic pag-ing is provided for all alarmsignals.

POWERQUEST®

is a client-server

application that

requires no

installation of

software on the

client computer.

POWERQUEST® Is THE Connectivity Solution

ASCO introduced the firstEthernet/Web-enabledconnectivity for transferswitches.

Local ComputerRemoteAccess Computer

Ethernet

RS 485

Internet

Firewall

Ethernet

Hub

Email Server

Ethernet

ASCO 5500Thin Web Server

Monitoringand Control

Pager

ATS Annunciator

Ethernet Hub

Monitoring

ASCO5150 (72E)Connectivity

Modules

ASCO5110 (72A)

Serial

Modules

ASCO ATSSwitches

ASCO ATSSwitches

Monitoring and Control

BuildingManagementComputer

RS-485

ASCOPower Control

System

To AdditionalPower

TransferSwitches

To AdditionalPower

TransferSwitches



25

Because power failurescan be life-threatening andcostly, there is no room forerror when it comes to test-ing and maintaining powertransfer switches and paral-leling control switchgear.

Skilled ASCO Ser-vices technicians properly

maintain and test transferswitches and power controlsystems coast to coast.

Technicians check op-eration of engine-generatorparalleling systems andtransfer switches with a

Relying on 24/7 Service

laptop computer. The com-puter tests multiple compo-nents quickly and accuratelyand can send maintenanceresults to a printer for hard-copy documentation.

Technicians are avail-able 24/7 in most areas.

Fully stocked vans sup-

port the technicians duringonsite visits, often eliminat-ing the need to order parts.

ASCO Services main-tains and upgrades a rangeof transfer switches from avariety of manufacturers.Technicians resolve prob-lems created by corrosion,evidence of overheating,

Helps avert the most common cause of transfer switchfailure: lack of regular maintenance.

contact erosion and a num-ber of other causes.

Besides maintainingequipment, ASCO Servicescan install and upgradepower transfer switches andpower control systems.

ASCO Services is the largestorganization of its kind in theUnited States.

Two levels of mainte-nance programs can be cus-tomized to meet the needsof one facility or many net-worked facilities.

Level One includesannual scheduled mainte-

nance during or after busi-ness hours, a discount onparts and a reduced hourlyrate for additional labor thatmight be required.

Level Two includes LevelOne service, plus all parts,labor, expenses and emer-gency service calls. Emer-gency service is dispatched24/7/365.

Maintenance Programs



Demands considerable record-keeping that too often can mean personnel spend manyhours operating onsite power systems and recording data manually.

26

Meeting or Exceeding Code Requirement

Weekly inspectionsheets for an emergencypower system can include55 or more data points andrequire writing commentsin long hand. Monthly test-ing logs can have nearly 40or more data points. A thirdform, a generator load re-port, builds the pile of nec-essary paperwork.

It’s no wonder that er-rors can and do occur.

A solution to testingemergency power systemsmore efciently is to auto-mate the testing procedureand data recording. Auto-mating the process facili-tates compliance, substanti-ates insurance claims and

defends against litigationarising from potentially life-threatening events. It alsohelps manage the facility’senergy consumption moreeffectively.

An automated Web-based communicationssystem–POWERQUEST®–in-tegrates the operation ofmonitoring and controlling,multiple engine-genera-tor paralleling systems and

automatic power transferswitches.

The 7000 Series Control-ler automatically exercisesengine-generator systemsand logs data on the exercise.

POWERQUEST® canconduct transfer tests

remotely that simulate apower failure, start the gen-set, transfer the load to thealternate power source andrun the generator underload for the period speciedin the codes and standards.

POWERQUEST® theninitiates retransfers backto normal power and runsthe generator through cooldown. The system moni-tors the engine-generators

throughout the test andautomatically records read-ings.

Personnel can selectfrom seven automatic testschedules. Code referencesfor NFPA 99 emergencypower systems testing are

* Joint Commission on Accreditation ofHealthcare Organizations

included in POWERQUEST®

.The transfer switch con-

troller stores up to 99 eventswith time and date stamp-ing. An optional printer in-terface produces hard-copydocumentation.

An ASCO Power Manag-er module measures singleand three phase powersystems in real time. Thebottom line is an integratedemergency power system

that better equips main-tenance and engineeringstaffs to meet the require-ments of NFPA 110, NFPA99 and, for healthcare orga-nizations, the JCAHO*.

ASCO Technology Meets or Exceeds New Seismic Requirements

ASCO Automatic Trans-fer Switches and Power Con-

trol Systems meet or exceedIBC 2009, CBC and Section13.1.3 of ASCE 7-05 seismicstandards. Period.

Regardless of the Oc-cupancy Category, SeismicDesign Category or Impor-tance Factor specied foryour project, ASCO offersqualied and thoroughlycertied products to meetthese requirements. ACerticate of Compliance,

seismic nameplate and spe-cial drawings are furnished

with the product.Also standard is ASCO

participation in your QualityAssurance program forfacilitating code compliance,proper installation andcommissioning.

The products all havebeen physically tested ontri-axial seismic simulatorswhile fully cabled. Mountingbolts remain seated, doors

remain shut and, the robustdesign of mechanically

locked critical components,such as the main contacts,prevents jamming. Testingadhered strictly to AC 156criteria.

They’ve all operatedduring and after testing. Soeven during an actual seis-mic event, they’re ready tosense loss of normal source,signal gensets to start andtransfer power reliably.

ASCO technologyeliminates the question of

whether the power switch-ing and controls equipmentis properly certied, even fordemanding rooftop installa-tions.

Minimize your exposureto risk, liability, the potentialfor red-tagged equipmentand insurance issues. Com-pare, then specify ASCO.Bottom line, it’s peace ofmind. Yours.



Satises the needs of engineering decision makers responsible

for on-site power systems. It’s one reason why ASCO Power

Technologies is the number one manufacturer of power

transfer switches on the planet.

Reliability is a productof innovative and proven de-sign, conguration exibili-ty, quality, ease of operationand serviceability. ASCOPower Transfer Switches de-liver it all.

For almost a century,every major advance inpower transfer switchingand control design and de-velopment has come fromASCO. ASCO pioneered theworld’s:

•First automatic transferswitch in 1920

•First solenoid operatedtransfer switch

•First 1200 Amp transferswitch

•First solid state automatictransfer switch controlpanel

•First microprocessor au-

tomatic power transferswitch controller

•First 1600 and 2000Amp transfer switches

•First overlapping switchedneutral

•First inphase monitor em-ployed on transfer switch-es and rst advanced,self-regulating inphasepower technology

•First 3000 and 4000Amp transfer switches

•First integrated powertransfer bypass-isolationswitch

•First two-way bypass-isola-tion transfer switch

•First automatic bypass-isolation transfer switchwith drawout design forserviceability

•First closed transitiontransfer switch

•First high-speed power

transfer switch

•First three cycle “anybreaker” withstand andclose-on current ratingcapability

•First closed transition softload power transfer switchqualied and listed to UL1008

•First 18- and 30-cyclewithstand current ratingsfor transfer switches

•First power manager withembedded I/O and kWcommand and control

•First communications anddata-logging capabilityfor transfer switches

•First Ethernet/Web en-abled connectivity fortransfer switches

•First U.L. approved, CEmarked, IEC 60947-6-1compliant and third-partyKema Keur marked auto-matic transfer switch

•First load shed optimiza-tion for power controlsystems

•First 6kA &10kA UL mainbus rating for engine par-alleling switchgears.

ASCO also pioneeredthe world’s most advancedautomatic transfer switch—the 7000 Series. The com-pany developed the 7000Series using a powerful arrayof human and technologicalresources. These innova-tive rsts evolved from theexpressed needs of our cus-tomers.

RELIABILITY IS WHAT

ENGINEERING DEPARTMENTS

AND FACILITIES DIRECTORS

WANT MOST IN AUTOMATIC

TRANSFER SWITCHES.

RELIABILITY MEANS THE

DIFFERENCE BETWEEN A NIGHT

SPENT RESOLVING PROBLEMS,

OR SLEEPING SOUNDLY

27

Creating Innovatio



Technological toolssuch as 3-D computer-aidedmodeling facilitate the de-sign process. Finite elementanalysis helps engineeringteams design componentsthat manage magnetic andmechanical stressesdependably.

Teams evaluate proto-

types with fused depositionmodeling and a state-of-the-art power lab. The labveries performance underreal conditions and qualiesdesigns to listing agencystandards. High-speedvideo photography enablesengineers to analyze howdesigns react to stress

over time frames of a fewmilliseconds.

The result is a continu-ing stream of innovations inpower transfer technologythat meets the evolvingneeds of hospitals, data andnancial centers, and otherbusiness-critical facilities.

Besides innovative

technology, ASCO offers thesecurity of a dependablecompany large enough tosatisfy customers’ evolvingneed for application sup-port, project managementand 24/7 eld service.

Whatever the challenge,ASCO can help facility engi-neers keep their power on.

Experienced engineers with decades of accomplishment s

and advanced degrees empl oy cutting- edge design to

test and qualify innovative transfer switch technology.

The world’s most so-phisticated power transfertechnology comes to life asthe 7000 Series AutomaticTransfer Switch family.

In terms of congura-tion exibility, the family is

based on a four-pole archi-tecture and a single or dualsolenoid operator. Also,one controller is utilized forall amperages, voltages,frequencies and transferswitch congurations (open

A Case in Point

transition, delayed transi-tion, closed transition andsoft load).

Quality is assured withthe ISO 9001:2000 certica-tion earned by ASCO for itsproduction facilities.

ASCO Power TransferSwitches are easy to operatebecause information-rich,menu-driven and multi-lan-guage displays are intuitivefor virtually any operator.

28

Through High Technology



Documents

7000 Series ATS Brochure 3158 R4