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Series 300
Operator’s
Automatic Transfer Switches
Manual
G design, 1000 through 3000 amp. sizes
TABLE OF CONTENTS
DANGER is used in this manual to warn of high
section
voltages capable of causing shock, burns, or death.
INSTALLATION .......................... 1
SEQUENCE OF OPERATION ............. 2
WARNINGisusedinthismanualtowarn
of possiblepersonal injury.
TESTING & SERVICE .................... 3
ADJUSTMENTS ......................... 4
CONTROLFEATURES ................... 5
CAUTIONisusedinthisma
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Nameplate Catalog Number Identification The Transfer Switchnameplate includes data for Atypical CatalogNumber is shownbelowwithits eachspecificASCOSeries 300ATS. Use the ATS elements explained. The example is for a G–design only withinthe limits shownonthis nameplate. Series 300ATSwithswitchedneutral, 3pole, 2000 amp, 480V, ina Type 1enclosure: G300 3 2000 N 1 C Neutral PhasePoles Amperes Voltage Controller Enclosure 2–singleØ C 208 1–standard C –type1 B–switched 1000 L 440 3–threeØ 1200 F–type3
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SECTION1 INSTALLATION ASCO Series 300 AutomaticTransfer Switches (ATSs) are Auxiliary Cable Box for1000–2000amp Listed under Underwriters Laboratories UL 1008 Standard Anauxiliarycablebox isrequiredifthepowercablesdo for Safety for AutomaticTransfer Switches. Series 300s are not enterthe enclosure directly adjacent tothe terminal also Listed under CSA C22.2 No. 178 Standard for ATSs. lugs(forexample, ifallpowercablesenterthetopor Allcontrolfeatures are UL Component Recognized, which bottom). Ord
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INSTALLATION (continued) ControllerGround Harnesses Agroundingwiremust beconnectedtothecontroller’s The transferswitchisconnectedtothe left side of the lowerleft mountingstud. Because the controlleris controllerby a plug–inharness(twoplugs). mountedonthe enclosure door, a conductive strapmust be usedbetweenthe enclosure andthe door. This connectionprovidespropergroundingwhichdoesnot rely uponthe doorhinges. Engine Starting Contacts Customer connections for engine controlcontact and TS Engine Sta
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INSTALLATION (continued) FunctionalTest TheFunctionalTest consistsofthreechecks: manual Turn counterclockwise operation, voltagechecks, andelectricaloperation. to Emergency. Grasp Turn clockwise handle Do these checks in the order presented to to Normal. firmly avoid damaging theautomatictransferswitch. insert handle slide hub Readallinstructionsonthe WiringDiagramandlabels into hole onto shaft affixedtotheautomatictransferswitch. Notethe controlfeaturesthat are providedandreviewtheir Figure 1-3
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INSTALLATION (continued) observe these lights Figure 1–5. Standard controls and indicators. 2–VoltageChecks Close the normal source circuit First checknameplate ontransferswitch;ratedvoltage Source Accepted breaker. The Normal Transfer mustbethesameasnormalandemergencylinevoltages. 1 Switch Position and the Normal Normal Source Accepted lights should Emergency come on. Verify thatthe feeders have been Use an accurate voltmeter to connected to the proper lugs. check phase to phase and 2 phase to
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INSTALLATION (continued) observe these lights pressthisbutton Figure 1–6. Standard controls and indicators. 3–ElectricalOperation The normal source must be Source Accepted availableandthegenerator This procedure willcheck the electricalopertion of the 1 must be ready to start. AutomaticTransferSwitch. Normal Check that the Normal Source Emergency Accepted light is on. Press and hold the Transfer Test button until the engine starts Transfer Closetheenclosuredoorfirst! 2 Test and runs. This should
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SECTION2 SEQUENCEOFOPERATION Lights show position of transfer switch. Lights show the sources accepted. Light for built–in TransferToEmergency engine exercise timer: Thesequenceforloadtransferto blinks rapidly when emergency source begins automati- button is held 5 sec. cally when normal source voltage while being set fallsbelowthepreset dropoutpoint blinks slowly when button is released (set) or when Transfer Test button is and during 20 min. pressed.Anundervoltagecondition exercise period. o
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SECTION3 TESTING&SERVICE PREVENTIVEMAINTENANCE DISCONNECTINGTHE CONTROLLER ForhighreliabilityandlonglifefortheATS: The harness disconnect plugs are furnished for repair purposesonlyandshouldnothavetobeunplugged. Ifthe Operate the switch atleast once a month.Performthis controller must be isolated, followthese steps carefully. 4–stepElectricalOperationTest(testwithloadtransfer). DisconnectingthePlugs Do notunplug the controlleruntil step 1a.or1b.belowiscompleted. 1. Observethepositionofthetransfe
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(continued) TESTING&SERVICE 1. Opennormalandemergencysourcecircuitbreakers. MANUALLOADTRANSFER This procedure will manually transfer the load if the 2. Use the maintenance handle to manually operate controllerisdisconnected. transferswitchtotheoppositesource. Seepage1–3, ManualOperationTest. Do notmanually operate the transferswitch 3. If the transfer switch is in the Emergency position until bothpowersources are disconnected: manually start the engine generator and then close openbothcircuitbre
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2 2 4 4 6 6 3 3 1 2 1 2 1 2 1 2 1 1 SECTION4 ADJUSTMENTS To change a setting, follow procedure on page 4-2. Use TimeDelayAdjustment Standard time delays are set to customer specifications Table 4-1asaguidetotimedelayvaluesandtheircorre- (if none specified, standard factory settings are used). spondingadjustment DIPswitch orpotentiometer. Table4-1.TimeDelaySettings FACTORY ADJUSTMENT S3DIP ADJUSTMENT DESCRIPTION LABELS SETTING RANGE SWITCH POTENTIOMETER 1second Actuator1on O Ovve errid rride eM M
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(continued) ADJUSTMENTS cover thumb Donotmakeanysettingchanges latch whilethecontrollerisenergized. HowtoChangeaSetting 1. Preventthetransferswitchfromoperatingbydiscon- hook on left side nectingone source first, thenthe other, asfollows: a. If the transfer switch is in the Normalposition, opentheemergencysourcecircuitbreaker.Turn theenginestartingcontroltooff.Thenopenthe normalsource circuit breaker. Figure 4-1. Controller cover latch. b. If the transfer switch is in the Emergency position,open
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5 5 7 7 8 8 8 8 SECTION5 CONTROLFEATURES–ENGINEEXERCISERS These timersperiodically exercise the emergency engine-generatorplant. They canbe set to exercise withorwithout loadtransfer, orthey canbe completely disabled. The engine-generatorshouldbe exercisedunderloadonce a week for a minimumtime period of 20 minutes, orfollowthe recommendations of the engine-generatorset manufacturer. Refer to page 4–2 forlocation of DIPswitches, battery (provided), and jumper block in the controller. BUILT–INENGI
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5 5 7 7 8 8 CONTROLFEATURES (continued) Optional Accessory11BG–SOURCE AVAILABILITYSIGNAL &PROGRAMMABLEENGINEEXERCISERMODULE 2–line display connections for source availability signalcontacts 3 buttons Figure 5–2. Accessory 11BG module (mounted behind operator interface and connected to the controller) includes source availability signalcontacts and a programmable engine exerciser. Source AvailabilitySignalContacts ThemoduleprovidesoneFormCcontacteachforthe normalandemergency sourcessignalthe acce
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CONTROLFEATURES (continued) HowtoSetOptionalProgrammableEngineExerciser (part of Acc. 11BG module) NOTE: Whenchoosingbi–weeklyoperation,the exerciserwillalwaysrunontheweekdesignated“(1)” Hazardousvoltagecapableof causing shock, onthedatedisplay. burns,ordeathisused inthistransferswitch. RunTimeDisplay DeenergizebothNormal &Emergency power sources before programming the exerciser. The Run Time Display shows the run time forthe engine exerciser. The default settingfromthe factory is30min. Time Dis
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6 6 2 2 4 4 7 8 7 8 7 8 7 8 5 5 3 3 1 1 CONTROLFEATURES (continued) INPHASE MONITOR LOADDISCONNECT FEATURE FOR MOTOR LOADTRANSFER Connectexternalcircuitstotheterminalsindicatedonthe WiringDiagramprovidedwiththeATS. Inphasemonitoringlogiccontrolstransferandretransfer of motor loads, so that inrush currents do not exceed Thedoublethrow(FormC)contactisratedfor28VDCor normal starting currents. It avoids nuisance tripping of 120VAC(5ampsresistive). Thecontactoperatespriorto circuit breakers and mecha
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CONTROLFEATURES (continued) OPTIONALSTRIPHEATER(Accessory44) Accessory 44 Strip Heater is designed to keep ambient thermostat temperatures within the Automatic Transfer Switch enclosureatacceptablelevels. Thisaccessoryconsistsofa mounting bracket with strip heater, thermostat, and dial terminalblock. Atransformerwithfusesisincludedwhen thepowerfortheassemblyisderivedfromvoltagesabove 120Vac. The120Vaccustomerpoweredassemblydoes not include a transformer. This optional accessory is availablefacto
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INDEX A G P ground, controller, 1–1 parts, 3–1 accessories, 5–2, 5–5 problem, 3–2 auxiliary circuits, 1–2 H programmable engine exerciser, 5–2, handle, maintenance, 1–3 5–3 B warning, 1–3 harness, 1–2 battery, 4–2, 5–1 R disconnect plugs, 3–1 buttons, push, 3–1 ratinglabel, inside cover HELP bypass time delay, 1–5, 2–1, 3–1 remote controlfeatures, 5–4 800–800–2726 (ASCO) bypass transfer time delay, 5–4 customercare@asco.com inhibit transfer to emergency, 5–4 C remote test, 5–4 I remote transfert
