Emerson 7ATB Power Supply User Manual
Contents
1. REPLACEMENT PARTS Replacement parts are available in kit form When ordering parts provide the Serial No Bill of Material No BOM and Catalog No from the transfer switch nameplate For service call ASCO Services at 1 800 800 2726 DISCONNECTING THE CONTROLLER The harness disconnect plugs are furnished for repair purposes only and should not have to be unplugged If the controller must be isolated follow these steps A DANGER Bypass Isolation Switch is energized Do not touch isolation contact fingers shock burns or death could result Disconnecting the Plugs 1 Bypass and Isolate the Automatic Transfer Switch 2 Open the upper enclosure door 3 Separate the two quick disconnect plugs by squeez ing the latches Do not pull on the harness wires Reconnecting the Plugs 1 The ATS should be still bypassed and isolated 2 The two harness plugs and sockets are keyed Carefully align the plugs with the sockets and press straight in until the latches click 3 Close the enclosure doors 4 Follow Return to Service instructions on page 3 3 TESTING amp SERVICE continued TROUBLE SHOOTING Note any optional accessories that may be furnished on the ATB and review their operation Refer to any separate drawings and or instructions that may be packed with the ATB A DANGER Hazardous voltage capable of causing shock burns or death is used in this switch Do not touch the power or l2. Automatie SENA Che a DAMA Proaza me ee O counterclockwise draws out transfer switch approx 16 turns approx 12 turns for 4000 A until window shows TEST The ATS can be tested Figure 3 6 Isolation Handle now without load interruption see page 2 1 NOTE In the TEST position the transfer switching device solenoid operator circuit is energized through secondary disconnects Bypass Switch A DANGER Hazardous voltage capable of causing electrical shock burns or death do not touch any control circuit terminals Turn crank counter clockwise until window shows TEST Automatic Transfer Switch Figure 3 4 CONNECTED to TEST position 3 Continue turning Isolation Handle counterclock wise approx 7 turns approx 8 turns for 4000 A until the window shows ISOLATE Bypass Switch Figure 3 7a 1000 3000 A transfer switch Turn crank isolated and pulled out for inspection counter See page 2 2 for maintenance handle use For clockwise 1000 3000 A lifting yoke kit 607064 is available to until facilitate lifting by using an overhead crane or similar window 5 equipment For 4000 A use lifting yoke 835745 001 ISOLATE 1000 3000 A switches weighs 350 450 Ibs use lifting yoke 607064 4000 A switches weigh approx 600 Ib use lifting yoke 835745 001 or other device capable of lifting this weight to avoid personal injury or equipment damage Automatic Transfer Switch Figure 3 5 TES
3. Accepted Figure 1 3 Standard controls and indicators 2 Electrical Operation This procedure checks electrical operation of the ATS Be sure to close the enclosure door before proceeding to prevent personal injury in case of electrical system fault Transfer Test The ATS should still be bypassed Both normal and emergency sources must be available and the emergency source generator if used must be capable of being started put engine starting control in automatic position The Transfer Switch Connected to Normal light and the Normal Source Accepted light should be on 1 Turn the Isolation Handle counterclockwise to the TEST position NOTE The engine generator may be signalled to start while turning the Isolation Handle If emergency source is available the ATS may operate to the emergency position If it does operate Retransfer Delay Bypass switch 2 Perform steps 1 5 at right Observe the status lights E Black square means light is on A White square means light is off 3 Turn the Isolation Handle clockwise to the CONN connected position 4 Push in the Bypass Handle and turn it counterclock wise to the OPEN position This completes the Functional Test of the ATB Control m ay Bypass an SECONDS lt a operate this switch The Transfer Switch Connected to Normal and Normal Source Accepted lights should be on Turn and hold Transfer Control switch clockwise to Trans
4. EMERSON Network Power Transfer Transfer Switch Transfer Switch Control Connected Connected Aetransfer Tansfer To Delay Test y Normal Emergency Bypass 5 SECONDS To Normal A observe these lights Emergency Source Source Accepted Accepted Figure 1 2 Standard controls and indicators Functional Test Read all instructions on the Wiring Diagrams and labels affixed to the ATB Note the control features that are provided and review their operation before proceeding After installing the ATB check the following Bypass Handle should be in the NORMAL position Isolation Handle should be in the CONN position TS transfer switch Normal contacts should be CLOSED Emergency contacts should be OPEN If handles are not in correct positions follow instruc tions for Bypassing and Isolating the automatic transfer switch in Section 3 Do not force the handles Electrical interlocks prevent a wrong sequence of operation 1 Voltage Checks First check nameplate on transfer switch rated voltage must be the same as normal and emergency line voltages DANGER Use extreme caution when using a meter to measure voltages Do not touch power terminals shock burns or death could result A Perform steps 1 6 at the right Observe the status lights See Figure 1 2 E Black square means light is on O White square means light is off Tf necessary adjust voltage regulator on genera
5. TEST The ATS can be tested now without load interruption see page 2 1 Bypass Switch Turn crank clockwise until window shows TEST Solenoid interlock prevents you from closing the isolation contacts until the ATS is in the same position as the Bypass Switch 3 Observe which Bypass Switch Position indicator is black VORMAL or EMERGENCY at the Bypass Switch Handle This indicates the source connected to the load 4 Observe which Transfer Switch Connected To light is on Normal or Emergency on the door This is the position of the Transfer Switch If it is not in the same position as the Bypass Handle change the position of the Transfer Switch as follows To change the position of transfer switch Operate to NORMAL OperatetoEMERGENCY Turn Transfer Control Turn Transfer Control switch to Retransfer switch to Transfer Test Delay Bypass hold 15 seconds Connected To Normal Connected To Emergency light should come on light should comes on If Feature 2B time delay is used there will be a delay before transfer to Emergency NOTE With Normal available the automatic transfer switch will not stay in the emergency position unless Feature 3A time delay is used at least 30 seconds Do not close the isolation contacts unless the Transfer Switch ATS and Bypass Switch are in the same position 5 When the transfer switch is in the same position as the Bypass Switch handle continue t
6. amp Engine Control Transfer Control amp Lights Bypass Handle Group 5 Controller Isolation Handle Er sm pp u Zr EI oe oe Transfer Switch G7ATB 4000 A with the lower doors open transfer switch shown SECTION 1 The ASCO 7000 Series Automatic Transfer amp Bypass Isolation Switch ATB consists of an upper bypass isolation switch a lower transfer switch a monitoring and transfer controller and door mounted controls The ATB is factory wired and tested Installation requires removal of the shipping skid then securing the enclosure to the supporting foundation Remove the Shipping Skid Open the front lower door and remove the two front lag screws securing the enclosure to the wood skid Next remove the rear lower panel and remove the two rear lag screws securing the enclosure to the wood skid Supporting Foundation The supporting foundation for the enclosure must be level and straight Allow at least 35 inches in front of the enclosure for draw out of the Transfer Switch Refer to the enclosure outline drawing included with the ATB for all mounting details including door opening space If bottom cable entry is used the foundation must be prepared so that the conduit stubs are located correctly Refer to the appropriate enclosure outline drawing for specified cable entrance area and location Provide cable bending space and clearance to live metal parts When a concrete floor is pour
7. support legs must be extended as shown in Figure 3 8 Substantial initial force is required to pull out the transfer switch there are detents on rails The 4000 A transfer switch weighs 600 Ib Use lifting yoke 835745 001 or other device capable of lifting this weight to avoid personal injury or equipment damage BYPASSING amp ISOLATING continued RETURN TO SERVICE This procedure explains how to return the automatic transfer switch ATS to service after inspection and maintenance Observe the Bypass Switch Position indicator and lights Refer to Figures 3 7a 3 7b 3 8 3 9 and 3 10 1 Slide the transfer switch ATS into the enclosure isolation contacts facing inward until its crank pins engage the latch plates on both sides On 4000 A substantial force is required to overcome detents on the rails Next push in side rail carriage On 4000 A first retract the two legs and lock them in place See Figure 3 7b Then close enclosure door Close the enclosure door to prevent personal injury in case of electrical system fault Align position indicator Do not leave the handle in an intermediate position position window ISOLATION HANDLE CONN TEST ISOLATE TO CONNECT TO ISOLATE TRANSFER TRANSEEB SWITCH TURN CLOCKWISE unfold crank Figure 3 8 Isolation Handle 2 Turn the Isolation Handle clockwise approx 7 turns approx 8 turns for 4000 A until the window shows
8. 2 bypassing the ATS 3 1 C catalog number inside cover cleaning 2 1 connections power 1 2 controller disconnecting 2 1 see Controller User s Guide D drawout transfer switch 3 2 3 3 E electrical operation 1 4 Emergency Source Accepted light Engine Control selector switch Auto position 2 1 engine starting contacts 1 2 F foundation 1 1 frequency generator 2 2 functional test 1 3 1 4 H harness 1 2 disconnect plugs 2 1 HELP customercare asco com 800 800 ASCO Printed in U S A INDEX inspection 3 1 installation 1 1 isolating the ATS 3 2 lights 1 3 1 4 load connected to emergency 1 4 load connected to normal 1 4 lubrication 2 1 M maintenance preventive 2 1 maintenance handle 2 2 warning 2 2 manual load transfer 2 2 warning 2 2 N nameplate cover Normal Source Accepted light 1 3 O operation electrical 1 4 manual 2 2 warning 2 2 P parts 2 1 phase rotation check 1 3 preventive maintenance 2 1 problem 2 2 R rating label cover removal of shipping angles 1 1 removal of shipping skid 1 1 replacement parts 2 1 return to service 3 4 3 5 S service ASCO Services Inc ASI 2 1 settings see Controller User s Guide shipping angles 1 1 warning 1 1 shipping skid 1 1 support legs on 4000 A 3 3 T test functional 1 3 1 4 testing power cables 1 2 time delays 2 1 see Controller Us
9. ASCO 7000 Series 7ATB Operator s Automatic Transfer amp Manual Bypass Isolation Switches G design 1000 through 4000 amp sizes A DANGER Refer to the outline and wiring drawings provided with your 7000 Series ATB for all installation and DANGER is used in this manual to warn of high connection details and accessories voltages capable of causing shock burns or death Refer to Group 5 Controller User s Guide 381333 126 A WARNING for ATS status display messages time delays pickup j j amp dropout settings and adjustments WARNING is used in this manual to warn of possible personal injury An experienced licensed electrician must install the TATB A CAUTION Rating Label CAUTION is used in this manual to Each 7000 Series 7ATB contains a rating label to warm ef possible equipment damage define the loads and fault circuit withstand closing ratings Refer to the label on the Transfer Switch for specific values Do not exceed the values on the rating label Exceeding the rating can cause personal injury or serious equipment damage Nameplate The Transfer Switch nameplate includes data for each specific 7000 Series ATB Use the switch only within the limits shown on this nameplate A typical Catalog Number is shown below with its elements explained TABLE OF CONTENTS section page INSTALLATION Mounting cc dia ae 1 1 Power Connections ooooooooo 1 2 En
10. ATS is bypassed to Emergency or yellow NORMAL when ATS is bypassed to Normal Source To un Bypass Emergency pull out handle all the way amp turn it counterclockwise Figure 3 11 Bypass Handle and position indicators To Un Bypass Normal Source Load connected to Normal Source The Transfer Switch Connected To Normal light is on and Transfer Switch Connected To Emergency light is off Push in the Bypass Handle then turn it counterclock wise until Bypass Switch Position shows OPEN green indicator The Unit Not in Automatic light should be off Bypass Switch Push in Bypass Handle amp turn it counter clockwise Figure 3 12 Un Bypass Normal To Un Bypass Emergency Source Load connected to Emergency Source The Transfer Switch Connected To Emergency light is on and Transfer Switch Connected To Normal light is off Pull out the Bypass Handle then turn it counterclock wise until Bypass Switch Position shows OPEN green indicator The Unit Not in Automatic light should be off Pull out Bypass Handle amp turn it counter clockwise Figure 3 13 Un Bypass Emergency The Automatic Transfer amp Bypass Isolation Switch should be left in this position NOTE When Accessory 66A reversed Normal amp Emergency connections is specified the handle push pull operation is reversed Follow instructions on the door 3 5 A auxiliary circuits 1 2 B bus connections 1
11. SOLATING BYPASSING THE ATS This procedure explains how to Bypass the closed automatic transfer switch contacts Bypassing is required before the ATS can be tested or isolated The Bypass Handle must be in the OPEN position green indicator and the Isolation Handle must be in the CLOSED position window See Figures 3 1 3 2 and 3 3 You can only bypass to the same source that the Transfer Switch is connected Solenoid interlock prevents incorrect operation Observe which Transfer Switch Connected To light is on Normal or Emergency on the door This is the position of the automatic transfer switch 2 Bypass to the same source as connected to transfer switch as follows select Normal or Emergency BYPASS Indicator shows green OPEN when the ATS is not bypassed To Bypass Normal push in handle all the way amp turn it clockwise BYPASS SWITCH HANDLE _J EMERGENCY Indicator shows yellow EMERGENCY CLOSED when ATS is bypassed to Emergency or yellow NORMAL CLOSED when ATS is bypassed to Normal Source To Bypass Emergency pull out han dle all the way amp turn it clockwise Figure 3 1 Bypass Handle and position indicators To Bypass Normal Source Load connected to Normal Source The Transfer Switch Connected To Normal light is on and Transfer Switch Connected To Emergency light is off Push in the Bypass Handle all the way then turn it clockwise
12. T to ISOLATE position 4 Open the lower enclosure door s Pull out the side rail carriage On 4000 A extend two support To avoid personal injury and equipment legs see Figure 3 7b Then roll out the transfer damage on 4000 A switches two support legs switch It can be safely inspected in this position must be amp dended as shown In Figure 3 7 f Substantial initial force is required to pull out The transfer switch can also be removed for easier the transfer switch there are detents on rails maintenance operations BYPASSING amp ISOLATING continued grasp two handles locking pin with clevis pin rail support carriage left support leg Kaas with clevis pin D adjust length to touch floor right support leg Drawout procedure adjust length to touch floor Bypass and Isolate the ATS then open both lower doors Pull out the rail support carriage all the way Remove left amp right clevis and locking pins drop two support legs reinstall locking and clevis pins to lock in place and adjust both leg lengths to extend to the floor 4 Stand directly in front of transfer switch Grasp both handles and pull straight out detents on the rails require high initial force to overcome resistance On Figure 3 7b 4000 amp transfer switch isolated and pulled out for inspection A WARNING A WARNING To avoid personal injury and equipment damage on 4000 A switches two
13. ed use interlocking conduit spacer caps or a wood or metal template to maintain proper conduit alignment Mounting Refer to the enclosure outline drawing furnished with this switch and mount the 7000 Series ATB according to the details and instructions shown on the drawing INSTALLATION Remove Shipping Brackets Angles from the Transfer Switch Open the lower front door s The Transfer Switch carriage is secured to the frame for shipment Remove the three or four shipping brackets or L angles 1 upper left 1 upper right 1 lower right or 2 lower on 4000 A To prevent serious damage remove 3 shipping angles from the transfer switch carriage Do not turn the Isolation Handle until they are removed remove 3 or 4 shipping brackets L angles Figure 1 1 On 1000 3000 A remove three shipping L angles a remove 2 lower shipping brackets Figure 1 2 4000 A remove four shipping L angles INSTALLATION continued A DANGER De energize the conductors before making any line or auxiliary circuitry connections Be sure that Normal and Emergency line connections are in proper phase rotation Place engine gen erator starting control in the OFF position Make sure engine generator is not in operation Testing Power Conductors Do not connect the power conductors to the ATB until they are tested Installing power cables in conduit cable troughs and ceiling suspended hangers often re
14. equired Be sure to close the enclosure door before proceeding to prevent personal injury in case of electrical system fault Perform the five step Electrical Operation Transfer Test procedure on page 1 4 PREVENTIVE MAINTENANCE Reasonable care in preventive maintenance will insure high reliability and long life for the 7000 Series ATB An annual preventive maintenance program is recom mended ASCO Services Inc ASI is ASCO Power Technologies national service organization ASI can be contacted at 1 800 800 2726 for informa tion on preventive maintenance agreements Checklist for Yearly Inspection A Hazardous voltage capable of causing shock burns or death is used in this switch Deenergize both Normal Emergency power sources before performing inspections DANGER O Clean the ATB enclosure Brush and vacuum away any excessive dust accumulation Remove any moisture with a clean cloth Check the transfer switch contacts Remove transfer switch barriers and check the condition of the contacts Replace contacts when pitted or worn excessively Reinstall the barriers carefully Maintain transfer switch lubrication If switch is subjected to severe dust or abnormal operating conditions renew factory lubrication on all move ments and linkages Relubricate solenoid operator if TS coil is replaced Don t use oil order lubrica tion kit 75 100 A Check all cable connections amp retighten them
15. er s Guide Transfer Control selector switch Retransfer Delay Bypass 1 4 Transfer Test 1 4 Transfer Switch Connected To Emergency light 1 4 Transfer Switch Connected To Normal light 1 4 transfer test 1 3 2 1 transfer to emergency 1 4 2 1 transfer to normal 1 4 2 1 troubleshooting 2 2 V voltage checks 1 3 voltage pickup and dropout settings see Controller User s Guide ASCO Power Technologies L P 2009
16. fer Test until the engine starts and runs within 15 sec The Emergency Source Accepted light should come on Transfer switch will operate to the Emergency position after Feature 2B time delay The Transfer Switch Connected To Emergency light should come on and Load Connected to Normal light goes off Transfer switch will operate back to Normal position after Feature 3A time delay For im mediate retransfer turn Transfer Control counterclockwise to Retransfer Delay Bypass The Transfer Switch Connected To Normal light should come on Transfer Switch Connected to Emergency light should go off The engine generator will stop after the Feature 2E time delay unloaded running engine cool down The Emergency Source Accepted light should go off SECTION 2 TESTING amp SERVICE TRANSFER TEST Test the Automatic Transfer Switch portion of the 7000 Series ATB at least once a month This procedure checks the electrical operation of the Transfer Switch and Controller Put the engine generator starting con trol at the engine generator set in automatic mode In the following test the generator will start the load will be transferred to the Emergency source then back to the Normal source An interruption to the load will occur unless the the Transfer Switch contacts are by passed before the test See pages 3 1 and 3 2 for by passing amp isolating instructions if no interruption of load is r
17. gine Starting amp Auxiliary Circuits 1 2 Functional Test o ooo o 1 3 1 4 TESTING amp SERVICE Transfer Test 0 0 0 0 ccc cece eee 2 1 Preventive Maintenance 2 1 Disconnecting the Controller 2 1 Manual Load Transfer 2 2 Trouble Shooting 222222200 2 2 BYPASSING amp ISOLATING Bypassing the ATS 3 1 Isolating the ATS 2 0000 eee 3 2 Return to Service o o o o 3 3 3 4 4000 amp size NBEY x deve acstatenaneeeex back cover ASCO Power __ 50 Hanover Road Florham Park New Jersey 07932 1591 USA 381333 132 F ENT ologias For sales or service call 1 800 800 2726 ASCO www ascopower com h ASCO POWER TECHNOLOGIES CANADA PO Box 1238 17 Airport Road Brantford Ontario Canada N3T 5T3 EMERSON Metweoik Poner Catalog Number Identification Typical 7000 Series ATB catalog no for overlapping neutral 3 pole 4000 amp 480 V in Type 1 enclosure G7ATB C 3 4000 N 5 C Neutral Phase Poles Amperes Voltage Controller Enclosure A solid 2 single 1000 A 115 J 400 5 standard C type 1 B switching 3 three 1200 B 120 K 415 5X if F type 3R Cu overlapping 1600 C 208 L 440 accessories G type 4 blank none 2000 De Mea L type 12 2600 E 230 N 480 blank open type 3000 F 240 P 550 4000 G 277 Q 575 H 380 R 600 Status Lights
18. oad terminals of the bypass switch or transfer switch Table 2 1 Trouble Shooting Checks PROBLEM CHECK IN NUMERICAL SEQUENCE 1 OPERATION 2 GEN SET 3 VOLTAGE Engine generator set does not start when the Transfer Control switch is turned and held in Transfer Test position or when normal source fails Hold Transfer Test switch 15 seconds or the outage must be long enough to allow for Feature 1C time delay plus engine cranking and starting Starting control must be in the automatic position Batteries must be charged and connected Check wiring to engine starting contacts Transfer switch does not transfer the load to the emergency source after the engine generator set starts Wait for Feature 2B time delay to time out Generator output circuit breaker must be closed Generator frequency must be at least 95 of nominal 57 Hz for a 60 Hz system Voltmeter should read at least 90 of nominal phase to phase voltage between transfer switch terminals EA amp EC or EL1 amp EL2 for 2 pole Transfer switch does not transfer the load to normal source when normal returns or when the Transfer Control switch is released Wait for Feature 3A time delay to time out Voltmeter should read at least 90 of nominal phase to phase voltage between transfer switch terminals NB amp NC NC amp NA amp NA amp NB or NL1 amp NL2 for 2 pole Engine generator set does not st
19. on is used use SAE grade 5 hardware to connect bus to appropriate terminal plates on bypass switching device Wipe off bus surfaces before they are joined If bus is dirty gently clean surfaces with a non flammable solvent Avoid touching cleaned surfaces Do not breathe cleaning solvent vapors Use SAE grade 5 hardware and tighten the bolted joints to the torque specified in Table 2 1 The reliability of the connection depends on how clean and how tight the joint is Table 2 1 Tightening torque values for bolted joints Bolt Diameter Grade 5 hardware Recommended Tightening Torque in inches in foot pounds 5 16 12 3 8 20 1 2 50 5 8 95 Harnesses All internal connections are made at the factory The bypass switch transfer switch and control panel are joined together by an interconnecting wire harness The disconnect plugs are already engaged on enclosed switches For open type switches the plugs must be engaged after installation is completed Align harness plugs with sockets in the control and push them together until they are secure Engine Starting Contacts and Auxiliary Circuits The engine control contact signal connections and auxiliary circuits are located on terminal block TB as shown on the Wiring Diagram provided with the ATB Connect the signal wires to the appropriate terminals INSTALLATION continued ASCO 7000 SERIES Power Transfer amp Bypass Switch
20. op after load retransfer to the normal source Wait for Feature 2E time delay to time out Starting control must be in the automatic position Material BOM No from the transfer switch nameplate These are factory settings Refer to Controller s User s Guide If the problem is isolated to circuits on the controller or the transfer switch call your local ASCO Power Technolo gies sales office or ASI in the United States call 1 800 800 2726 Furnish the Serial No Catalog No and Bill of MANUAL LOAD TRANSFER This procedure manually transfers load to other source if the Transfer Switch or Controller are out of service Close enclosure doors to prevent personal injury in case of electrical system fault 1 Besure that the Bypass Handle is CLOSED on either Emergency or Normal see page 3 1 Be sure that the Isolation Handle is in the TEST or ISOLATE position see page 3 2 3 Turn the Bypass Handle counterclockwise to OPEN the Bypass Switch Then Bypass to the other source see page 3 1 MAINTENANCE HANDLE A DANGER Bypass and isolate the Transfer Switch before using the maintenance handle See pages 3 1 and 3 2 Remove the maintenance handle after using it and store it on the frame Turn counterclockwise to Emergency Turn clockwise to Normal slide hub onto shaft Grasp handle firmly insert handle into hole SECTION 3 BYPASSING amp I
21. quires considerable force The pulling of cables can damage insulation and stretch or break the conductor s strands For this reason after the cables are pulled into position and before they are connected they should be tested to verify that they are not defective or have been damaged during installation Protect the switch from construction grit and metal chips to prevent malfunction or shortened life of the 7ATB switch Connecting Power Conductors A Wiring Diagram is furnished with the ATB All wiring must be made in accordance with the local codes After the power cables have been tested connect them to the appropriate terminal lugs on the Bypass Switch as shown on the wiring diagram provided with this ATB Make sure that the lugs provided are suitable for use with the cables being installed Standard terminal lugs are solderless screw type and will accept the wire sizes listed on the drawings provided with the ATB Be careful when stripping insulation from conductors avoid nicking or ringing the conductor Remove surface oxides from conductors by cleaning with a wire brush Follow conductor manufacturer s instructions when aluminum conductor is used Apply joint compound to conductor then carefully wipe away excess compound Tighten the cable lugs to the torque specified on the rating label Be sure that the Normal and Emergency power connections are in proper phase rotation Bus Connections If bus connecti
22. tor per the manufacturer s recommendations The ATB will respond only to rated voltage specified on the nameplate Now continue to 2 Electrical Operation on next page Close the normal source circuit breaker The Transfer Switch Connected To Normal and the Normal Source Accepted lights should come on Use an accurate voltmeter to check phase to phase and phase to neutral voltages pres ent at the transfer switch normal source terminals Close the emergency source circuit breaker Start generator if necessary The Transfer Switch Connected To Normal amp Emergency Source Accepted lights should come on Use an accurate voltmeter to check phase to phase and phase to neutral voltages pres ent at the transfer switch emer gency source terminals Use a phase rotation meter to check phase rotation of emer gency source it must be the same as the normal source ABC Shut down the engine genera tor f applicable The Emergen cy Source Accepted light should go off Then put the starting control selector switch on the generator set in the automatic position Close enclosure door INSTALLATION continued ASCO 7000 SERIES Power Transfer amp Bypass Switch Transfer Transfer Switch Transfer Switch nn Retranster Delay ei ae _ Normal A observe these lights Emergency Source Source Accepted
23. until Bypass Switch Position shows CLOSED on NORMAL yellow indicator The red light Unit Not In Automatic will flash Bypass Switch Push in Bypass Handle amp turn it clockwise Figure 3 2 Bypass to Normal To Bypass Emergency Source Load connected to Emergency Source The Transfer Switch Connected To Emergency light is on and Transfer Switch Connected To Normal light is off Pull out the Bypass Handle all the way then turn it clockwise until Bypass Switch Position shows CLOSED on EMERGENCY yellow indicator The red light Unit Not In Automatic will flash Bypass Switch Pull out Bypass Handle amp turn it clockwise Figure 3 3 Bypass to Emergency The automatic transfer switch can now be put in the TEST or OPEN position See ISOLATING on page 3 2 NOTE When Accessory 66A reversed Normal amp Emergency connections is specified the handle push pull operation is reversed Follow instructions on the door BYPASSING amp ISOLATING continued ISOLATING THE ATS Isolating is required before any service work can be CONN performed on the automatic transfer switch ATS TEST Refer to Figures 3 4 3 5 3 6 and 3 7 ISOLATE position window TO CONNECT TO ISOLATE TRANSFER TRANSEEB SWITCH TURN CLOCKWISE 1 Bypass the closed automatic transfer switch contacts See BYPASSING on page 3 1 Align position indicator Do not leave the handle in an intermediate position
24. urning the Isolation Handle clockwise approx 16 turns approx 12 turns for 4000 A until the window shows CONN connected Bypass Switch Turn crank clockwise until window shows CONN connected Figure 3 10 TEST to CONNECTED position Figure 3 9 ISOLATE to TEST position Now continue to the next page for instructions on how to return the Bypass Handle to the OPEN postition 3 4 BYPASSING RETURN TO SERVICE continued This procedure explains how to return the Bypass Switch Handle to the OPEN position The Bypass Handle must be in the CLOSED position yellow indicator on NORMAL or EMERGENCY and the Isolation Handle must be in the TEST position window If the handles are not in these positions refer to Return to Service on page 3 3 See Figures 3 11 3 12 and 3 13 amp ISOLATING continued You can only bypass to the same source that the ATS is connected Solenoid interlock prevents incorrect operation Observe which Bypass Switch Position indicator is yellow VORMAL or EMERGENCY at the Bypass Switch Handle This indicates the source connected to the load Un Bypass to same source as the Bypass Switch Position as follows select Normal or Emergency Indicator shows green OPEN when the ATS is not bypassed To un Bypass Normal push in handle all the way amp turn it counterclockwise BYPASS SWITCH HANDLE Indicator shows yellow EMERGENCY CLOSED when
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