GE AKR-30 Series Maintenance Manual Download Page 164 | Manualshive

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These instructions do n o t purport to cover all details or variations in equipment nor to provide for every possible

contingency to be met i n connection with installation operation or maintenance. Should further info rmation
be desired or should particular problems arise which are not covered sufficiently for the purchaser's purposes,
the matter should be referred to the

GE

Company.

GE Electrical Distribution & Control

General Electric Company

4

7

Woodford A ve . Plainville, CT 06062

GEK-644590 0596 PSA

© 7

996 General Electric Company

www

. ElectricalPartManuals

. com

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Summary of Contents for AKR-30 Series

Page 1: ..._ Ma ntenance Manual GEK 644598 6 Low Voltage VPower Circuit Breakers Types AKR 30 50 andAKRT 50 G f GENERAL fj ELECTRIC w w w E l e c t r i c a l P a r t M a n u a l s c o m...

Page 2: ...Closing 1 1 7 15 Trip Latch Adjustment 32 5 2 1 Alt Control Circuit 12 SECTION 8 33 5 3 Mechanism Operation 13 5 4 Charging Using The 8 0 CONTACT MAINTENANCE 33 Maintenance Handle 13 8 1 Arc Chute Rem...

Page 3: ...SATRIP TRIP DEVICE 58 Fuse Selection 12 1 Programmer Unit 58 Table 17 77 12 1 1 Fault Trip Indicators 58 Bell Alarm Contact Rating 12 1 2 Remote Fault Indication 58 Table 18 77 12 1 3 MicroVersaTrip I...

Page 4: ...EFORE INSPECTING OR BEGINNING ANY MAINTENANCE WORK ON THE BREAKER IT MUST BE DISCONNECTED FROM ALL VOLT AGE SOURCES BOTH POWER AND CON TROL AND BE IN THE oPEN POSITION A basic inspection should consis...

Page 5: ...R 28 50 AKRU A 30 X 800 AKRU 8 30 AKRU 0 30 AKRU A 50 X 1600 AKRU B 50 AKRU 0 50 Th s dlg t ldenbf es the tnp dev ce type as follows 2 EC DC only 4 ECS 5 SST 50 60 Hertz Only 6 M croVersa Tnp MOUNTING...

Page 6: ...cture needed The conductive members are the studs for exter nal connections movable and stationary contact sets pivots for the movable contacts and provision for mounting the current transformers The...

Page 7: ...r r FIG 2 Electrically Operated AKR SB 30 FIG 3 Fused Breaker AKRU 60 30 FIG 4 Drawout Breaker 7 w w w E l e c t r i c a l P a r t M a n u a l s c o m...

Page 8: ...ERAMIC ARC CHUTES 2 5 TRIP DEVICE There are 4 types of solid state direct acting self powered trip device systems associated with AKA break ers These systems are for AC applications only For DC applic...

Page 9: ...AT SOH 800 AKAU 30 1600 AKAU 50 800 DC AKA 30 2000 DC AKA 50 With 40 800 Amp Trip Coils With 200 2000 Amp Trip Coils consult Factory For Application Data 3c INTERRUPTION RATING RATED KA RMS SYMMETRICA...

Page 10: ...terchangeability In general drawout breakers of the same type and rating are interchangeable in their equipment compartments drawout breakers of different frame sazes are not anter changeable To preve...

Page 11: ...fully charged As this fully charged position is reached mechanically operated switches F and G reverse their shown position the G switch deenergizing the motor and the F switch estab lishing a circuit...

Page 12: ...the closing solenoid Thi removes the prop releasing the closing springs to close the breaker The F cutoff switch is only installed on breakers using D C control voltage The anti pump function is obta...

Page 13: ...linkage This allows the secondary latch to pivot against the front frame as shown leaving a gap between the trip latch and secondary latch roller The secondary latch is now in a position to engage wit...

Page 14: ...see Fig 1 2 This holds the closing spring in a charged condition Rotate the camshaft using the maintenance handle until the ratchet assembly s roller engages with the prop Do not drive the roller agai...

Page 15: ...must be slid to the right to gain access to the drive shaft When the breaker is in the CLOSED position a link en gages the RACKING SCREW cover preventing it from being opened This link is driven by t...

Page 16: ...n anached to the crank moves through the slot rn the linkage The hnkage IS connected to a leverwh1ch engages with a prn on the clos1ng solenoid armature hnkage When the rack1ng mechantsm approaches th...

Page 17: ...tached to the racking mechanism shaft is connected to the blocking plate through a link As the shaft turns the blocking plate rotates holding the cover open in the DISCONNECTED position but allowing i...

Page 18: ...d locksmay be used to lockthe inner house in the discon nected position When the breaker is in the CLOSED position the flywheel assembly is away from the lever The lever is spring loaded and rotates c...

Page 19: ...by a single 1 35 degree clockwise handle stroke or up to four multiple strokes of lesser swing The following adjustment procedures should be performed using the single stroke method By so doing proper...

Page 20: ...ISCHARGED position and the spring at its minimum extension Remove the hex head boltonly do notremoveor loosen the slotted head screw shown in Fig 21 Removal of the slotted head will cause the closing...

Page 21: ...EMBLY FIG 24 PARTIAL PRIMARY DISCONNECT ASM The BOO ampere breakers use four primary disconnect fingers per phase The 1 600 and 2000 ampere breakers use eight fingers per phase Fig 22 shows a line and...

Page 22: ...tacts are opened or closed as the breaker is opened or closed B contacts are the reverse of this The auxiliary switch is mounted on the upper side of the mechanism frame as shown in Fig 27 A crank on...

Page 23: ...ock will be supplied This is required for clearance in this case the buffer assembly must be taken off disassembled and remounted together with the number two undervoltage device Before disassembling...

Page 24: ...mature where Its constant radius Is closest to the rivet FIG 32A UNDERVOLTAGE DEVICE If excessive clearance or binding exists loosen the screws holding the magnet assembly to the frame and move the ma...

Page 25: ...y mounted in the switchgear and the undervoltage device is mounted on the breaker Table S lists the catalog numbers available INSERT WIRE GAGE FIG 320 POSITIVE TRIP CHECK If the a c control voltage is...

Page 26: ...located in the opening in the lower part of the escutcheon This breaker door must be opened to gain access to it MAIN SHAFT 2EM iCLOSED l I I 1 _ I Ti I I I I HOLD IN J_ l I FIG 34 ELECTRIC LOCKOUT BY...

Page 27: ...A 187 inch depression of the TRIP button must not trip the breaker but a 375 inch must trip the breaker and the side latch W RELAY X RELAY OR K RELAY 7 11 3 REPLACEMENT The bell alarm Is mounted on th...

Page 28: ...for slow dosing as described earlier Tum the camshaft using the maintenance handle until the roll pin is well started tum the camshaft to gain enough space for the roll pin to clear the breaker frame...

Page 29: ...erates the switches A very thin open end 5 8 inch wrench will be needed to loosen or tighten the nuts which fasten the switches to the bracket 7 1 3 DRAWOUT MECHANISM The drawout mechanism shown in Fi...

Page 30: ...SECTION 7 Breaker Maintenance Cont FIG 38 DRAWOUT MECHANISM DETAILS FIG 39 RACKING MECHANISM INSTALLED 30 w w w E l e c t r i c a l P a r t M a n u a l s c o m...

Page 31: ...shaft is driven against the buffer assembly shown in Fig 40 This prevents the mechanism from overdriving the contacts When the break r is opened the end plate assembly is driven against the opposite...

Page 32: ...n a 040 maximum clearance can exist between either of the end plate assemblies and the buffer bolt heads as shown If a larger clearance exists close it up by unscrewing the buffer assembly involved Fi...

Page 33: ...of arc chute construction used on the 800 thru 2000 ampere breakers They are the ceramic type shown in Fig 5 and the molded type shown in Fig 6 The ceramic type uses a two piece porcelain frame to en...

Page 34: ...on 5 3 3 Select one pole and using a flat or wire feeler gage measure the gap between the top contact and its pivot stud as shown in Fig 45 As necessary adjust the gap to 0 060 0 020 inch by turning t...

Page 35: ...SECTION 8 Contact Maintenance Cont FIG 448 AKR 30H 800 AMP CONTACT STRUCTURES 35 w w w E l e c t r i c a l P a r t M a n u a l s c o m...

Page 36: ...aker with tl e insulation held in place Examine the insulation to make sure it over hangs below the in termediate contacts but not enough to coverthe main con tacts 5 Attach a continuity checker bell...

Page 37: ...sually by removing the arc quenchers closing the breaker and verifying that all eight stationary main contacts are lifted off their stops Should wipe ad justment appear necessary proceed as follows 1...

Page 38: ...figurations shown in Figs 44 47 or 48 Fig 49 shows the stationary contacts and how they differ from one another The 800 amp main and arcing contacts are rectangular but the arcing contacts have two of...

Page 39: ...ionary contacts The stationary intermediate and main contacts are replaced just like the stationary contacts on the 800 ampere breakers Refer to steps 2 3 in Section 8 6 Referring to Fig 50 the statio...

Page 40: ...SECTION 8 Contact Maintenance Cont FIG SOB ARC RUNNER REMOVED 40 FIG SOC ARCING CONTACT PIVOT REMOVED w w w E l e c t r i c a l P a r t M a n u a l s c o m...

Page 41: ...A Class L fuse the special fuse is more compact shorter its tangs are specially configured and offset to achieve the required pole to pole fuse spac ing a special primary disconnect assembly mounts di...

Page 42: ...REAKER FUSE TANGS BREAKER STUD POSITIONED ON TOP OF BREAKER STUD 1TANG BOLT HOLES IN USE 0 0 l 2500A FUSE CAT NO GF9F2500 AK 0 0 FOR THIS POLE ONLY FUSE IS ROTATED 1 80 TO POSITION TANG BENEATH STUD 0...

Page 43: ...efer to Fig 56 a Back off tripping rod so that it will not hit the trip paddle when a solenoid is activated b Using the maintenance handle close the breaker c Manually close the Left pole armature Scr...

Page 44: ...ON 9 Fused Breakers Cont 44 TRIP PADDLE I ARMATURE FIG 56A DETAILS ll I I _ _ ___ _ r 1 RESET BUTION FIG 568 INSTALLED TYPE A OR 8 BREAKER OFLO DEVICE w w w E l e c t r i c a l P a r t M a n u a l s c...

Page 45: ...ated by the short time and instantaneous elements and the thirdforground fault The latter is omitted on units without ground fault FIG 57 SST BLOCK DIAGRAM OVOI CWI I TAIIGET I I I I I 1 CIM IIIT I TM...

Page 46: ...ries with a companion pnmary winding on a ground differential transformer mounted in the programmer unit Its secondary output is zero so long as there is not ground current Application of the Ground F...

Page 47: ...TAP BOARD 600 1600 A 300 800 A 100 3 00 A FIG 61 SST NEUTRAL SENSORS REAR VIEW AKR 50 BREAKER MOUNTED EQUIPMENT MOUNTED FIG 62 NEUTRAL SENSOR SECONDARY DISCONNECT BLOCKS 47 w w w E l e c t r i c a l...

Page 48: ...tighten the Allen head screws to 250 10 in lbs Tighten th6 clamping bolt as follows AKA 30 30H 120 10 in lbs AKA 50 50H 470 1 0 in lbs AKRT 50 50H 470 1 0 in lbs 10 3 FLUX SHIFT TRIP DEVICE The Flux S...

Page 49: ...nit should be replaced When making the electrical connector to the replacement unit it is recommended that the brea ker harness be cut at some convenient point and the new actuator leads solder splice...

Page 50: ...w Top view 1 Actuator 2 Trip rod adjuster end 4 Trip shaft 5 Actuator arm 3 Trip paddle 6 Reset linkage FIG 65 FLUX SHIFT TRIP DEVICE COMPONENTS TRIP PADDLE IN w CHANISW RESET POS I T ION FIG 66 TRIP...

Page 51: ...transformer will generate an unwanted ground fault output signal which will trip the breaker This can be nullified either by a testing two poles of the breaker in series or b using the Ground Fault D...

Page 52: ...CUIT THE CURRENT SENSORS ALLOWING DANGER OUS AND DAMAGING VOLTAGES TO DEVELOP Test scope 1 Verify the time current characteristics and pickup calibration of the various trip elements 2 Verify operatio...

Page 53: ...ensors are identical 1 0 5 SST CABLING DIAGRAMS c Verify that the harness connections to the sensors meet the polarity constraints indicated by the cabling dia gram i e white wire to COMMON black wire...

Page 54: ...BLING DIAGRAM SST WITH GROUND FAULT ON 3 WIRE LOAD 4 WIRE LOAD FLUX SHIFT TRIP DEVICE PROGRAMMER UNIT r o H 48V de J2 l ok f k TO SCR ANODE BLACK WHITE BLACK WHITE BLACK WHITE BLACK HARNESS CONNECTOR...

Page 55: ...L _ F n i H u L _ K 1t r L I I I I N M I I I I p R oo J FEMALE END PROGRAMMER UNIT r r I l H 0 t 3 f ti t 3 r o I f H I H a l L_J L _ _ _j ANY SST PROGRAMMER UNIT WITH GROUND FAULT ELEMENT FIG 71 CAB...

Page 56: ...atings which span the same range as SST see Fig 74 3 Neutral sensors are not required because there is no Ground Fault function In all other respects the ECS Trip device system operates and can be tre...

Page 57: ...800 1200 1600 2000 Pickup tolerance is 9 Pickup tolerance is 10 Time delay shown at 600 of long time pickup setting 6L at lower limit of band Time delay shown at lower limit of band TABLE 1 0 SENSOR R...

Page 58: ...TIUE PICKuP OELAV f SHORT TIU PICKuP DELAY t ST TAHEOVS PICKuP 1 GAQvO IO Ac T POC uP 0 LA f REGc A i f O lltlC A SuPI l I I I I I I I I 0VERLOAO ARGET T T SHORT oRCUIT ARGE T I T I I I I L _ _ _ _ _...

Page 59: ...They provide the necessary alignment for the connector engagement The locking lever engages with the pin which is assembled to the programmer frame and secures the pro grammer to the mounting bracket...

Page 60: ...stan taneous MicroVersaTrip option H option is required Fig 84 shows an H option phase sensor When the H option phase sensor is installed there are four leads connected to It two flag terminal connect...

Page 61: ...lled TJIPPed ol Sensor Multiple Del8y llulmum s n or Seneora CurTent ol CurTent f _ Aallng Aallng Aallng Seconds Size Amps _ f A8tlng X C 100 1 50 100 1 50 225 300 5 6 7 8 9 2 5 5 AKR 30 800 225 300 o...

Page 62: ...VersaTrip Trip Device Cont 62 TAPPED COMMON TERMINAL FIG 83 MICROVERSATRIP M PHASE SENSORS t G C t a E FIG 84 H Optlon Phase Sensor FIG 85 TYPICAL NEUTRAL S ENSOR w w w E l e c t r i c a l P a r t M a...

Page 63: ...connector from the contact pivot block c Loosen the clamping bolt and remove the stud con nector Uft out the sensor and its tap terminal board The sensor may be prevented from slipping off the sen sor...

Page 64: ...t the circuit breakf can be opened and closed normally from the test posltior attention can be directed to the trip device proper Testing is performed by either of two methods 1 Conduct high current s...

Page 65: ...ufficient to trip the breaker Similarly discontinuity between any sensor and the programmer unit can cause a false trip signal If nuisance tripping is encountered on any breaker whose MicroVersaTrip c...

Page 66: ...MMER AMP 1_350356 9 CONNECTOR LOAD FIG 89 CABLING DIAGRAM MICROVERSATRIP WITHOUT GROUND FAULT A B c A A A BREAKER BAcK FRAME r A b A 1 LEFT POLE I I CURRENT SENSOR I FLUX SHIFT TRIP DEVICE I I_ J r r...

Page 67: ...E LOAD 4 WIRE LOAD 1 1 1 BREAKER r _ 4 I BACK FRAME b b I LEFT POLE I CURRENT FLUX SHIFT TRIP DEVICE SENSOR I lf 4 H 1111 h I t I I EQUIPMENT MOUNTED I NEUTRAL SENSOR I A I NEUTRAL I SENSOR 1 DISCONNE...

Page 68: ...L _ _ _j ANY MICROVERSATRIP PROGRAMMER UNIT WITH GROUND FAULT ELEMENT FIG 93 CABLING DIAGRAM WITH GROUND FAULT DEFEAT MODULE INSERTED BETWEEN BREAKER HARNESS AND MICROVERSATRIP PROGRAMMER UNIT FOR USE...

Page 69: ...J AMP 1 350239 9 AMP 1 350246 9 AMP 1 350242 9 AMP 1 350235 9 FIG 95 CABLING DIAGRAM REMOTE FAULT I NDICATION PROGRAMMER SECONDARY DISCONNECT EQUIPMENT BREAKER SHORT TIME INPUT _ o E f Q i Q t _ SHORT...

Page 70: ...1 GES0010 EC 2 2A 1A 3 GES001 1 EC 2 2A 1 8 3 GES0012 EC 2 2A 1C 3 FIG 98 EC TRIP DEVICE TABLE 1 5 EC DEVICE TRIP CHARACTERISTICS l oftg Time Shott Time ln wrtllneoue Trip Device Pickup o y up Deley P...

Page 71: ...SECTION 13 EC Trip Device Cont _ fi _1_ I 2 FIG 99 OVERCURRENT TRIPPING DEVICE EC 2A r 71 w w w E l e c t r i c a l P a r t M a n u a l s c o m...

Page 72: ...ent screw 4 may be turned by in sertmg a Ph1ll1ps head screwdriver through the hole in the front of the case II it 1s des red to relate the linkage setting to the index marks on the hnkage it will be...

Page 73: ...ING The armature 1 0 is restrained by the calibration spring 1 1 After the magnetic force produced by an overcurrent condition overcomes this restraining force the armature movement is fur ther retard...

Page 74: ...oad condition FIG 1 02 CHECKING TRAVEL DISTANCE OF SERIES OVERCURRENT TRIPPING DEVICE 74 1 3 3 POSITIVE TRIP ADJUSTMENT Before attempting any checks or adjustments on breaker wi EC trip devices the br...

Page 75: ...ich tends to rotate the armature counterclockwise The calibration spring also tends to rotate the armature in the same direction This torque causes the armature to rest against the stop screw 12 attac...

Page 76: ...removed and replaced by following the pro cedure outlined for replacing the series overcurrent device See Section 1 3 6 For wiring see Fig 1 03 1 3 5 SWITCHETTE FEATURE The switchette is operated by t...

Page 77: ...024 90 015 01 5 180 090 052 090 052 95 047 032 050 029 050 029 1 75 032 01 8 064 036 064 036 1 90 035 023 CONTROL CLOSING RELAY X SOLENOID Rated Amps J Rated Amps S a Inrush Sealed 10 Inrush Open Clo...

Page 78: ...7 480 25 380 508 3 5 3 3 11 575 60 475 625 2 8 2 5 16 575 50 475 625 5 1 4 7 14 575 25 475 625 3 1 3 0 10 TABLE 22 COIL RESISTANCE DC OHMS 25 C Nominal Control Anti Pump Control Shunt Voltage Frequen...

Page 79: ...120 VAC 102 106 1 00 1 06 36 72 208 VAC 156 1 76 136 176 62 1 25 240 VAC 206 212 200 21 2 72 144 380 VAC 285 323 247 323 1 14 223 480 VAC 360 408 312 408 144 288 575 VAC 431 488 374 488 1 73 345 TABL...

Page 80: ...sw s Dv pa ses U o 0 ro l Como Outside the U S wr te ConstructiOn EQuipment Export Operat on 4 1 1 Theodore Fremd Ave Aye NY 10580 GEK 644598 PSE 1 285 For further 1nformat1on call or wnte your local...

Page 81: ...GEK 644590 Maintenance Manual Low Voltage Power Circuit Breakers Types AKR 30I50 and AKRT 50 w w w E l e c t r i c a l P a r t M a n u a l s c o m...

Page 82: ...7 15 Trip Latch Adjustment 32 5 1 Manual Closing 1 1 5 2 Electrical Closing 1 1 SECTION 8 33 5 2 1 Alternate Control Circuit 1 2 8 0 CONTACT MAINTENANCE 5 3 Mechanism Operation 13 33 5 4 Charging Usi...

Page 83: ...Epic MicroVersaTrip Installation 71 Current Sensors 71 Replacement of Current Sensors 74 Flux Shifter Trip Device 74 Troubleshooting 74 Resistance Values 74 False Tripping Breakers Equipped With Groun...

Page 84: ...OR BEGINNING ANY MAINTENANCE WORK ON THE BREAKER IT MUST BE DISCONNECTED FROM ALL VOLT AGE SOUR CES BOTH POWER AND CON TROL AND BE IN THE OPEN POSITION A basic i nspection should consist of the follow...

Page 85: ...R 2S 30 AKR 2A 50 X 2000 AKR 28 50 X DC AKR 2D 50 X X AKR 2S 50 AKRU A 30 X 800 AKRU 8 30 X AKRU D 30 X X AKRU A 50 X 1 600 AKRU 8 50 X AKRU D 50 X This digit identifies the trip device type as follow...

Page 86: ...ct sets pivots for the movable contacts and provision for mounting the current transformers The interrupter components are in addition to the arcing contacts the arc runners mounted on the back base a...

Page 87: ...FIG 2 Electrically Operated AKR 70 30 FIG 3 Fused Breaker AKRU 60 30 PRIMARY 7 FIG 4 Drawout Breaker 7 w w w E l e c t r i c a l P a r t M a n u a l s c o m...

Page 88: ...CHUTES 2 5 TRIP DEVICE There are several types of solid state direct acting self powered trip device systems associated with AKA breakers These systems are for AC applications only For DC application...

Page 89: ...30 1 600 AKRU 50 800 DC AKR 30 2000 DC AKR 50 With 40 800 Amp Trip Coils 2With 200 2000 Amp Trip Coils 3Consult Factory For Application Data 3 INTERRUPTION RATING RATED KA RMS SYMMETRICAL MAXIMUM WITH...

Page 90: ...any responsibility for prac tices which deviate from the following 1 ALL CONDUCTORS M UST BE ASSUMEDTO BE ENER GIZED UNLESSTHEIRPOTENTIALHASBEEN MEASURED AS GROUND AND SUITABLE GROUNDING CONDUC TORS...

Page 91: ...ed with primary current injection Others can be adequately tested using test sets Specific calibration instructions on particular devices typically are provided by supplied instruction books Instructi...

Page 92: ...d CC This removes the prop releasing theclosing springsto closethe breaker The F cutoff switch is only installed on breakers using D C control voltage The anti pump function is obtained through the no...

Page 93: ...item 1 4 to pivot against the front frame as shown leaving a gap between the trip latch and secondary latch roller The secondary latch is now in a position to engage with both the trip latch and cam...

Page 94: ...2 This holds the closing spring in a charged condition Rotate the camshaft using the maintenance handle until the ratchet assembly roller engages with the prop Do not drive the roller against the prop...

Page 95: ...om being opened This link is driven by the motion of the OPEN CLOSED indicatorasshown in Fig 1 5 CAUTION Prior to moving rack screw cover over to attach racking wrench push the manual trip button abov...

Page 96: ...anism arms and the crank are connected to a common shaft As the breaker is racked out a pin attached to the crank moves through a slot tint he mechanism linkage The linkage is connected to a lever whi...

Page 97: ...ched to the racking mechanism shaft is connected to the blocking plate through a link As the shaft turns the blocking plate rotates holding the cover open in the DISCONNECTED position but allowing it...

Page 98: ...ausing its pin to block the lock bolt extension 6 7 OPTIONAL INTERLOCKS The optional interlocks are key interlocks and door inter locks On drawout breakers these devices are mounted in the equipment a...

Page 99: ...surfaces should be avoided The cotton ravelings may become entangled under the bearing surfaces and destroy the surface of the bearing 7 2 MANUAL HANDLE ADJUSTMENT The adjustment linkage connects the...

Page 100: ...ARGED position and the spring at its minimum extension Remove the hex head bolt only do not remove or loosen the slotted head screw shown in Fig 21 Removal of the slotted head will cause the closing s...

Page 101: ...ARY DISCONNECT ASM The 800 ampere breakers with the exception of AKR 30L use four primary disconnect fingers per terminal The 1 600 amp 2000 amp and AKR 30L breakers use eight fingers per terminal Fig...

Page 102: ...e the reverse of this The auxiliary switch is mounted on the upper side of the mechanism frame as shown in Fig 27 A crank on the main shaft operates the switch through an adjustable link which connect...

Page 103: ...nd the trip paddle and recheck for positive trip If this bending is necessary be careful that it is not over done Verify that there is a 030 050 gap between the trip arm and the trip paddle with the b...

Page 104: ...On AC devices the dropout level will fall within the required limits 30 to 60 ofthe coil rating if the pickup is set properly On DC devices the dropout level may need independent adjustment This is ac...

Page 105: ...used will be shown on the breaker wiring diagram No more than one undervoltage tripping device should be used in conjunction with one static time delay unit The static time delay undervoltage can als...

Page 106: ...pening in the lower part of the escutcheon This breaker door must be opened to gain access to it 26 MAIN SHAFT BREAKER CLOSED _ ____ I 1 _ _ 1 ll _I 1 I lL l UV DEVICE __ _ _ FIG 34 ELECTRIC LOCKOUT B...

Page 107: ...375 inch depres sion must trip the breaker and displace the side latch W RELAY X RELAY 7 1 1 3 REPLACEMENT The bell alarm is mounted on the right hand side of the breaker at the rear of front frame I...

Page 108: ...for slow closing as described earlier Turn the camshaft using the maintenance handle until the roll pin is well situated turn the camshaft to gain enough space for the roll pin to clear the breaker fr...

Page 109: ...ates the switches A very thin open end 5 8 inch wrench will be needed to loosen or tighten the nuts which fasten the switches to the bracket 7 1 3 DRAWOUT MECHANISM The drawout mechanism shown in Fig...

Page 110: ...N 7 Breaker Maintenance Cont ARM COLLAR ADJUSTMENT SLEEVE LUBRICATiON TiON FIG 38 DF AWOUT IIIECiiANISIIf DETAilS FIG 39 DFfAWOUT NIECI fA NISNI INSTAllED w w w E l e c t r i c a l P a r t M a n u a l...

Page 111: ...driven against the buffer assembly shown in Fig 40 This prevents the mechanism from overdriving the contacts END PLATE When the break r is opened the end plate assembly is driven against the opposite...

Page 112: ...maximum clearance can exist between either of the end plate assemblies and the buffer bolt heads as shown If a larger clearance exists close it up by unscrewing the buffer assembly involved Fig 42 sho...

Page 113: ...CAM SHAFT AS DESCRIBED UN DER SLOW CLOSING THE BREAKER SECTION 7 4 8 1 ARC CHUTE REMOVAL AND INSPECTION There are two types of arc chute construction used on the 800 thru 2000 ampere breakers They ar...

Page 114: ...Select one pole and using a flat or wire feeler gage measure the gap between the top contact and its pivot stud as shown in Fig 45 As necessary adjust the gap to 0 060 0 020 inch by turning the wipe...

Page 115: ...SECTION 8 Contact Maintenance Cont FIG 44A AKR30 AKRU30 FIG 448 AKR 30H 800 AMP CONTACT STRUCTURES 35 w w w E l e c t r i c a l P a r t M a n u a l s c o m...

Page 116: ...ace Examine the insulation to make sure it over hangs below the intermediate contacts but not enough to cover the main contacts 5 Attach a continuity checker bell set light or ohm meter between the up...

Page 117: ...lly by removing the arc quenchers closing the breaker and verifying that all eight stationary main contacts are lifted oft their stops Should wipe ad justment appear necessary proceed as follows 1 Ope...

Page 118: ...the stationary contacts and how they differ from one another The AKR 30 and 30H main and arcing contacts are rectangular but the arcing contacts have two of their corners notched The AKR 30L AKR 50 AK...

Page 119: ...ert the pivot pin and replace the pivot spring and hardware Tighten the pivot pin hard ware to 90 5 in lbs 6 Install the coupling pin and tru arc retainer 7 Make the contact adjustment as per section...

Page 120: ...SECTION 8 Contact Maintenance Cont FIG SOB ARC RUN N ER REMOVED 40 FIG SOC ARCING CONTACT PIVOT REMOVED w w w E l e c t r i c a l P a r t M a n u a l s c o m...

Page 121: ...ent characteristic that coordinates with 1 600A trip devices Compared physi cally with a 2500A NEMA Class L fuse the special fuse is more compact shorter its tangs are specially configured and offset...

Page 122: ...Y DISCONNECT 0 FRONT OF BREAKER FUSE TANGS BREAKER STUD POSITIONED ON TOP OF BREAKER STUD l TANG BOLT HOLES IN USE L I 2500A FUSE CAT NO G F9F2500 AK G G FOR THIS POLE ONLY FUSE IS ROTATED 1 80 TO PO...

Page 123: ...pe A and B breaker OFLO Refer to Fig 56A a Back off tripping rod so that it will not hit the trip paddle when a solenoid is activated b Using the maintenance handle close the breaker c Manually close...

Page 124: ...SECTION 9 Fused Breakers Cont 44 TRIP PADDLE I ARMATURE FIG 56A DETAILS RESET BUTION FIG 568 INSTALLED TYPE A OR 8 BREAKER OFLO DEVICE w w w E l e c t r i c a l P a r t M a n u a l s c o m...

Page 125: ...ort time and instantaneous elements and the third forground fault The latter is omitted on units without ground fault 8 t OYERlMD 1 TARGET I I I I I I SIIDRT lctRCUIT I TARGET I FIG 57 SST BLOCK DIAGR...

Page 126: ...r in series with a companion primary winding on a ground differential transformer mounted in the programmer unit Its secondary output is zero so long as there is not ground current Application of the...

Page 127: ...P BOARD 600 1600 A 300 eoo A 100 300 A FIG 61 SST NEUTRAL SENSORS SHORTING STRAP B R E A K E P MOU N T E D EQUIPMENT MOUNTED FIG 62 NEUTRAL SENSOR SECONDARY DISCONNECT BLOCKS 47 w w w E l e c t r i c...

Page 128: ...d Screws 3 Stud Connector 4 Current Sensor d When replacing the stud connector tighten the Allen head screws to 250 1 0 in lbs Tighten the clamping bolt as follows AKA 30 30H 30L 1 20 1 0 in lbs AKA 5...

Page 129: ...uld be replaced When maki ng the electrical connector to the replacement unit it is recommended that the brea ker harness be cut at some convenient point and the new actuator leads solder spl iced tog...

Page 130: ...uator 4 Trip shaft 2 Trip rod adjuster end 5 Actuator arm 3 Trip paddle 6 Reset linkage FIG 65 FLUX SHIFT TRIP DEVICE COMPONENTS TRIP PA lDLE I N M ECHA NISM RESET POS IT ION 0 1 09 031 Dia rod J A M...

Page 131: ...transformer will generate an unwanted ground fault output signal which will trip the breaker This can be nullified either by a testing two poles of the breaker in series or b using the Ground Fault De...

Page 132: ...THE CURRENT SENSORS ALLOWING DANGER OUS AND DAMAGING VOL TAGES TO DEVELOP Test scope 1 Verify the time current characteristics and pickup calibration of the various trip elements 2 Verify operation of...

Page 133: ...Verify that the harness connections to the sensors meet the polarity constraints indicated by the cabling dia gram i e white wire to COMMON black wire to TAP d On Ground Fault breakers serving 4 wire...

Page 134: ...TO SCR I ANODE I I I I I I I I I I I I I l_ _ _ _ _ j HARNESS CONNECTOR PROGRAMMER CONNECTOR AMP 201298 1 AMP 201297 1 FIG 69 CABLING DIAGRAM SST WITH GROUND FAULT ON 3 WIRE LOAD 4 WIRE LOAD FLUX SHI...

Page 135: ...GROUND FAULT ELEMENT FIG 71 CABLING DIAG RAM WITH G ROUND FAULT DEFEAT CABLE INSERTED BETWEEN BREAKER HARNESS AND SST PROGRAMMER UNIT FOR USE DURING SINGLE PHASE HIGH CURRENT LOW VOLTAGE TESTING 55 w...

Page 136: ...ratings which span the same range as SST see Fig 74 3 Neutral sensors are not required because there is no Ground Fault function In all other respects the ECS Trip device system operates and can be tr...

Page 137: ...095 AKRT 50 2000 800 1200 1600 2000 G Pickup tolerance is 9 Pickup tolerance is 10 Time delay shown at 600 of long time pickup setting 6L at lower limit of band Time delay shown at lower limit of ban...

Page 138: ...US I PICKUP I I l 1 I I I f 1 I n GROUND FAULT I SUMMING PICKUP CIRCUITRY I NCT N DELAY I I r I 1 1 I 1 2 REGULATED I 15 VDC 1 3 POWER SUPPLY I L _ _ _ _ _ _ _ _ _ __ 58 FIG 76 MICROVERSATRIP BLOCK DI...

Page 139: ...hey provide the necessary alignment for the connector engagement The locking lever engages with the pin which is assembled to the programmer frame and secures the pro grammer to the mounting bracket T...

Page 140: ...s MicroVersaTrip option H option is required Fig 84 shows an H option phase sensor When the H option phase sensor is installed there are four leads connected to it two flag terminal connections additi...

Page 141: ...ltiple Delay Maximum Sensors Sensors Current of Current D Frame Rating Rating Rating Seconds Size Amps Sensor r urrent Rating Amps X C 100 1 50 1 00 150 225 300 5 6 7 8 9 2 5 5 AKR 30 800 225 300 or 8...

Page 142: ...VersaTriprM Trip Device Cont 62 TAPPED FIG 83 MICROVERSATRIPTI PHASE SENSORS AMPERE RATING CONNECTIONS FIG 84 H OPTION P HASE SENSOR FIG 85 TYPICAL NEUTRAL SENSOR w w w E l e c t r i c a l P a r t M a...

Page 143: ...from the contact pivot block c Loosen the clamping bolt and remove the stud con nector Lift out the sensor and its tap terminal board The sensor may be prevented from slipping off the sen sor stud by...

Page 144: ...shed that the circuit breaker can be opened and closed normally from the test position attention can be directed to the trip device proper Testing is performed by either of two methods 1 Conduct high...

Page 145: ...ut sufficient to trip the breaker Similarly discontinuity between any sensor and the programmer unit can cause a false trip signal If nuisance tripping is encountered on any breaker whose MicroVersaTr...

Page 146: ...I_ LOAD HARNESS CONNECTOR PROGRAMMER AMP 1 350356 9 CONNECTOR FIG 89 C ABLI N G DI AGRAM M I C ROVERSATRI PrM WITHOUT G ROUND FAU LT A q s c A A A s E r f 1 t 1 I LEFT POLE I CURRENT SENSOR I FLUX SHI...

Page 147: ...FAULT ON 4 WIRE LOAD 4 WIRE LOAD 1 1 1 BREAKER 1 4 1 BACK FRAME b b I LEFT POLE I CURRENT FLUX SHIFT TRIP DEVICE PROGRAMMER UNIT SENSOR I rt f t t o f l 111 1 4 I I I I I A I NEUTRAL I SENSOR I DISCO...

Page 148: ...MMER UNIT WITH I 0 I GROUND FAULT I 0 I I ELEMENT 4 0 I I I I I I I I I I I L l l_ _ _ _j FIG 93 CABLING DIAGRAM WITH GROUND FAULT DEFEAT MODULE INSERTED BETWEEN BREAKER HARNESS AND MICROVERSATRIP PRO...

Page 149: ...I I I I I I I I I_ _ _ _ _ _ _j AMP 1 350239 9 AMP 1 350246 9 AMP 1 350242 9 AMP 1 350235 9 FIG 95 CABLING DIAGRAM REMOTE FAULT INDICATION PROGRAMMER SECONDARY DISCONNECT EQUIPMENT BREAKER SHORT TIME...

Page 150: ...ng no external relaying power supply or accessories See Table 1 5 for trip functions available and Table 1 6 for trip function characteristics A detailed description of each trip function is given in...

Page 151: ...CURRENT SENSORS The current sensors supply the power and signal input necessary to operate the trip system Like the MicroVersaTrip the RMS 9 and Epic MicroVersaTrip uses a phase and neutral sensor Fi...

Page 152: ...etting S X C 1 50 5 6 Fixed at 400 7 8 1 0 of 800 9 95 Current 1 0 1 1 Setting 5 6 Fixed at 800 7 8 1 0 of 1 600 9 95 Current 1 0 1 1 Setting 5 6 Fixed at 2000 7 8 1 0 of 9 95 Current 1 0 1 1 Setting...

Page 153: ...rand therefore is separately mounted in the cable or bus compartment The outputs of the phase sensors and neutral sensor are connected to a programmer circuit which sums these values The total value w...

Page 154: ...SENSOR I I I 1 1 N I I A I NEUTRAL I r J LOAO I I COMr I ll i_ t I s H I c I I _j RED r 32 WHITE 18 22 1 9 f 20 24 21 1 7 I I I I I I_ c _N v v v I_ _ _ _ _ A s c LOAD HARNESS CONNECTOR AMP 1 350356 9...

Page 155: ...e with high range instantaneous MicroVersaTrip PM Trip Unit The MicroVersaTrip PM trip unit adds power manage ment system capability advanced metering and protective relays to the basic functions of t...

Page 156: ...d equipment circuity This plug is called the trip unit disconnect CAUTION Removal of a trip unit from its breaker must be performed with the breaker in the OPEN or TRIPPED position Draw out breakers s...

Page 157: ...racket When a trip u nit is replaced the locking arm snaps back i nto place to indi cate proper alignment WARNING Always de energize Type AKR circuit break ers before attempting to remove or replace t...

Page 158: ...thi common terminal All phasesensors must be correctly w1red forthe programmer summing circuitry to function properly 80 TAPPED FIG 1 16 COMMON TERM I NAL The fixed phase sensors are available with an...

Page 159: ...acity to approximately 25 of the current sensor rating Interchangeable rating plugs are removed with a Rating Plug Extractor Catalog No TRTOOL Suitable equiva lents are commercially available as integ...

Page 160: ...protection High range fixed instantaneous overcurrent protection Short time protection with or without I 2T Ground fault protection with or without 12T Zone selective interlock with ground fault only...

Page 161: ...ined incorrectly Potential transformer PT primary voltage was defined incorrectly PT connection was defined incorrectly Total power metering Test Kit initiated trip indication Corrective Action At lea...

Page 162: ...06 o 380 50 31 5 41 0 2 9 2 6 0 0 22 08 a 480 60 380 508 3 4 3 1 0 0 23 08 I C 480 50 380 508 7 5 7 3 ce Cil 1 7 06 480 25 380 508 3 5 3 3 o_ l 1 1 05 J o 575 60 475 625 2 8 2 5 0 1 6 06 u o 575 50 4...

Page 163: ...2 208 VDC 1 77 62 1 25 240 VDC 204 72 1 44 380 VDC 323 1 1 4 228 480 VDC 408 1 44 288 575 VDC 489 1 73 345 TABLE 26 TIME DELAY UNDERVOLTAGE DEVICE SETTINGS DELAY PICK UP RANGE UVR INSTALLED DROP OUT U...

Page 164: ...nce Should further info rmation be desired or should particular problems arise which are not covered sufficiently for the purchaser s purposes the matter should be referred to the GE Company GE Electr...

Page 165: ...GEK 64459C Maintenance Manual Low Voltage Power Circuit Breakers Types AKR 30 50 and AKRT 50 w w w E l e c t r i c a l P a r t M a n u a l s c o m...

Page 166: ...1 7 1 5 Trip Latch Adjustment 32 5 1 Manual Closing 1 1 5 2 Electrical Closing 1 1 SECTION 8 33 5 2 1 Alternate Control Circuit 1 2 8 0 CONTACT MAI NTENANCE 33 5 3 Mechanism Operation 13 8 1 Arc Chute...

Page 167: ...5 2 Series Overcurrent 12 0 MICROVERSATRI P TRIP DEVICE 58 Tripping Device EC 1 87 1 2 1 Programmer Unit 58 1 5 2 1 Short Time Delay Tripping 87 1 2 1 1 Fault Trip Indicators 58 1 5 2 2 Long Time Del...

Page 168: ...G OR BEGINNING ANY MAINTENANCE WORK ON THE BREAKER IT MUST BE DISCONNECTED FROM ALL VOLT AGE SOURCES BOTH PO WER AND CON TROL AND BE IN THE OPEN POSITION A basic inspection should consist of the follo...

Page 169: ...X 800 AKRU 8 30 AKRU D 30 AKRU A 50 X 1 600 AKRU 8 50 AKRU D 50 This digit identifies the trip device type as follows 2 EC DC only 4 ECS 5 SST 50 60 Hertz Only 6 MicroVersa Trip MOU NTING TYPE DRAWOUT...

Page 170: ...ontact sets pivots for the movable contacts and provision for mounting the current transformers The interrupter components are in addition to the arcing contacts the arc runners mounted on the back ba...

Page 171: ...FIG 2 Electrically Operated AKR 70 30 FIG 3 Fused Breaker AKRU 60 30 RACKING MECHANISM FIG 4 Orawout Breaker 7 w w w E l e c t r i c a l P a r t M a n u a l s c o m...

Page 172: ...C CHUTES 2 5 TRIP DEVICE There are several types of solid state direct acting self powered trip device systems associated with AKA breakers These systems are for AC applications only For DC applicatio...

Page 173: ...H 800 AKRU 30 1 600 AKRU 50 800 DC AKR 30 2000 DC AKR 50 With 40 800 Amp Trip Coils 2With 200 2000 Amp Trip Coils Consult Factory For Application Data 3 INTERRUPTION RATING RATED KA RMS SYMMETRICAL MA...

Page 174: ...es any responsibility for prac tices which deviate from the following 1 ALL CONDUCTORS MUST BE ASSUMEDTO BE ENER GIZED UNLESSTHEIR POTENTIALHAS BEEN MEASURED AS GROUND AND SUITABLE GROUNDING CONDUC TO...

Page 175: ...with primary current injection Others can be adequately tested using test sets Specific calibration instructions on particular devices typically are provided by supplied instruction books Instruction...

Page 176: ...into the drawout rails There is one exception to the above Breakers of the same frame size having different short circuit ratings may be interchanged in one direction only a An AKR 30H can be inserte...

Page 177: ...ined incorrectly Potential transformer PT primary voltage was defined incorrectly PT connection was defined incorrectly Total power metering Test Kit initiated trip indication Corrective Action At lea...

Page 178: ...EC 2 2A 1A 3 GES 601 1 EC 2 2A 1 B 3 GES 6012 EC 2 2A 1 C 3 FIG 1 20 EC 1 TRIP DEVICE TABLE 17 EC DEVICE TRIP CHARACTERISTICS Long Time Short Time lnatantlineoue Trip Device Pickup CD Delay Pickup De...

Page 179: ...SECTION 15 EC Trip Device Cont FIG 1 2 1 OVERCURRENT TRIPPING DEVICE EC 2A 85 w w w E l e c t r i c a l P a r t M a n u a l s c o m...

Page 180: ...me adjustment screw 4 may be turned by in serting a Phillips head screwdriver through the hole in the front of the case If it is desired to relate the linkage setting to the index marks on the linkage...

Page 181: ...re 1 0 is restrained by the calibration spring 1 1 After the magnetic force produced by an overcurrent condition overcomes this restraining force the armature movement is fur ther retarded by the flow...

Page 182: ...ts to an overload condition FIG 1 24 CHECKING TRAVEL DISTANCE OF SERIES OVERCURRENT TRIPPING DEVICE 88 1 5 3 POSITIVE TRIP ADJUSTMENT Before attempting any checks or adjustments on breaker with EC tri...

Page 183: ...ch tends to rotate the armature counterclockwise The calibration spring also tends to rotate the armature in the same direction This torque causes the armature to rest against the stop screw 12 attach...

Page 184: ...vice can be removed and replaced by following the pro cedure outlined for replacing the series overcurrent device See Section 1 5 6 For wiring see Fig 1 25 1 5 5 SWITCHETTE FEATURE The switchette is o...

Page 185: ...050 029 050 029 1 75 032 01 8 064 036 064 036 1 90 035 023 CONTROL CLOSING RELAY X SOLENOID Rated Amps Rated Amps c Inrush Sealed 1 Inrush Sealed c Open Closed E O Open Closed 4 1 4 1 38 5 2 5 2 1 05...

Page 186: ...9 0 1 6 06 o _ _ 380 50 315 410 2 9 2 6 0 0 22 08 480 60 380 508 3 4 3 1 0 0 23 08 L C 480 50 380 508 7 5 7 3 co 1 7 06 480 25 380 508 3 5 3 3 o J 1 1 05 J 0 575 60 475 625 2 8 2 5 Q 1 6 06 0 475 625...

Page 187: ...208 VDC 1 77 62 125 240 VDC 204 72 1 44 380 VDC 323 1 1 4 228 480 VDC 408 1 44 288 575 VDC 489 1 73 345 TABLE 26 TIME DELAY UNDERVOLTAGE DEVICE SETTINGS DELAY PICK UP RANGE UVR INSTALLED DROP OUT U N...

Page 188: ...nce Should further information be desired or should particular problems arise which arc not covered sufficiently fi lr the purchaser s purposes the matter should be referred to the GE Company GEElectr...

Page 189: ...rse their shown position the G switch deenergizing the motor and the F switch estab lishing a circuit to the X relay At the same time a mechanical prop is positioned to prevent the discharge of the fu...

Page 190: ...CC This removes the prop releasing the closing springs to closethe breaker The F cutoff switch is only installed on breakers using D C control voltage The anti pum p function is obtained through the n...

Page 191: ...item 1 4 to pivot against the front frame as shown leaving a gap between the trip latch and secondary latch roller The secondary latch is now in a position to engage with both the trip latch and cam r...

Page 192: ...2 This holds the closing spring in a charged condition Rotate the camshaft using the maintenance handle until the ratchet assembly roller engages with the prop Do not drive the roller against the pro...

Page 193: ...rom being opened This link is driven by the motion of the OPEN CLOSED indicatorasshown in Fig 1 5 CAUTION Prior to moving rack screw cover over to attach racking wrench push the manual trip button abo...

Page 194: ...nism arms and the crank are connected to a common shaft As the breaker is racked out a pin attached to the crank moves through a slot tint he mechanism linkage The linkage is connected to a lever whic...

Page 195: ...ched to the racking mechanism shaft is connected to the blocking plate through a link As the shaft turns the blocking plate rotates holding the cover open in the DISCONN ECTED position but allowing it...

Page 196: ...using its pin to block the lock bolt extension 6 7 OPTIONAL INTERLOCKS The optional interlocks are key interlocks and door inter locks On drawout breakers these devices are mounted in the equipment an...

Page 197: ...surfaces should be avoided The cotton ravelings may become entangled under the bearing surfaces and destroy the surface of the bearing 7 2 MANUAL HANDLE ADJUSTMENT The adjustment linkage connects the...

Page 198: ...RGED position and the spring at its minimum extension Remove the hex head bolt only do not remove or loosen the slotted head screw shown in Fig 21 Removal of the slotted head will cause the closing sp...

Page 199: ...FIG 24 PARTIAL PRIMARY DISCONNECT ASM The 800 ampere breakers use four primary disconnect fingers per terminal The 1 600 and 2000 ampere breakers use eight fingers per terminal Fig 22 shows a line an...

Page 200: ...e reverse of this The auxiliary switch is mounted on the upper side of the mechanism frame as shown in Fig 27 A crank on the main shaft operates the switch through an adjustable link which connects it...

Page 201: ...positive trip If this bending is necessary be careful that it is not over done Verify that there is a 030 050 gap between the trip arm and the trip paddle with the breakerclosed A gap greater than 050...

Page 202: ...l will fall within the required limits 30 to 60 ofthe coil rating ifthe pickup is set properly On DC devices the dropout level may need independent adjustment This is accomplished after the pickup lev...

Page 203: ...nnects to be used will be shown on the breaker wiring diagram No more than one undervoltage tripping device should be used in conjunction with one static time delay unit The static time delay undervol...

Page 204: ...ing in the lower part of the escutcheon This breaker door must be opened to gain access to it 26 MAI N SHAFT BREAKER CLOSED _ I 1 1 1 I ___ _ Tl i l C lL i HOLD IN I L I NK _ r 11 1 FIG 34 ELECTRIC LO...

Page 205: ...ut a 375 inch depres sion must trip the breaker and displace the side latch W RELAY X RELAY 7 1 1 3 REPLACEMENT The bell alarm is mounted on the right hand side of the breaker at the rear of front fra...

Page 206: ...ed for slow closing as described earlier Turn the camshaft using the maintenance handle until the roll pin is well situated turn the camshaft to gain enough space for the roll pin to clear the breaker...

Page 207: ...erates the switches A very thin open end 5 8 inch wrench will be needed to loosen or tighten the nuts which fasten the switches to the bracket 7 13 DRAWOUT MECHANISM The drawout mechanism shown in Fig...

Page 208: ...30 SECTION 7 Breaker Maintenance Cont ARM LUBRiCATiON COLLAR lUBRICATION I IG 38 DRAWOUT MECHANISM DETAILS I w w w E l e c t r i c a l P a r t M a n u a l s c o m...

Page 209: ...ft is driven against the buffer assembly shown in Fig 40 This prevents the mechanism from overdriving the contacts When the breaker is opened the end plate assembly is driven against the opposite end...

Page 210: ...maximum clearance can exist between either of the end plate assemblies and the buffer bolt heads as shown If a larger clearance exists close it up by unscrewing the buffer assembly involved Fig 42 sh...

Page 211: ...o types of arc chute construction used on the 800 thru 2000 ampere breakers They are the ceramic type shown in Fig 5 and the molded type shown in Fig 6 The ceramic type uses a two piece porcelain fram...

Page 212: ...ler gage measure the gap between the top contact and its pivot stud as shown in Fig 45 As necessary adjust the gap to 0 060 0 020 inch by turning the wipe adjustment nut shown in Fig 45 46 4 Once the...

Page 213: ...SECTION 8 Contact Maintenance Cont FIG 44A AKR30 AKRU30 FIG 448 AKR 30H 800 AMP CONTACT STRUCTURES 35 w w w E l e c t r i c a l P a r t M a n u a l s c o m...

Page 214: ...the insulation to make sure it over hangs below the in termediate contacts but not enough to cover the main con tacts 5 Attach a continuity checker bell set light or ohm meter between the upper and l...

Page 215: ...lly by removing the arc quenchers closing the breaker and verifying that all eight stationary main contacts are lifted off their stops Should wipe ad justment appear necessary proceed as follows 1 Ope...

Page 216: ...ions shown in Figs 44 47 or 48 Fig 49 shows the stationary contacts and how they differ from one another The 800 amp main and arcing contacts are rectangular but the arcing contacts have two of their...

Page 217: ...e pivot pin and replace the pivot spring and hardware Tighten the pivot pin hard ware to 90 5 in lbs 6 Install the coupling pin and tru arc retainer 7 Make the contact adjustment as per section 8 2 8...

Page 218: ...SECTION 8 Contact Maintenance Cont FIG SOB ARC RUN N ER REMOVED 40 FIG SOC ARCING CONTACT PIVOT REMOVED w w w E l e c t r i c a l P a r t M a n u a l s c o m...

Page 219: ...nt characteristic that coordinates with 1 600A trip devices Compared physi cally with a 2500A NEMA Class L fuse the special fuse is more compact shorter its tangs are specially configured and offset t...

Page 220: ...Y DISCONNECT 0 FRONT OF BREAKER FUSE TANGS BREAKER STUD POSITIONED ON TOP OF BREAKER STUD lTANG BOLT HOLES IN USE L I 2500A FUSE CAT NO GF9F2500 AK FOR THIS POLE ONLY FUSE IS ROTATED 1 80c TO POSITIO...

Page 221: ...e A and B breaker OFLO Refer to Fig 56A a Back off tripping rod so that it will not hit the trip paddle when a solenoid is activated b Using the maintenance handle close the breaker c Manually close t...

Page 222: ...SECTION 9 Fused Breakers Cont 44 TRIP PADDLE 11 ARMATURE FIG 56A DETAILS RESET BUTTON FIG 568 INSTALLED TYPE A OR B BREAKER OFLO DEVICE w w w E l e c t r i c a l P a r t M a n u a l s c o m...

Page 223: ...the short time and instantaneous elements and the third for ground fault The latter is om itted on un its without ground fault 8 t OVERLOAD I TARGET I I I I I I SHORT lciRCUIT I TARGET I FIG 57 SST BL...

Page 224: ...r in series with a companion primary winding on a ground differential transformer mounted in the programmer unit Its secondary output is zero so long as there is not ground current Application of the...

Page 225: ...ITH TAP BOARD 600 1 600 A 300 aoo A 100 300 A FIG 61 SST NEUTRAL SENSORS B R E A K E F M O U N T E D EQUIPMENT MOUNTED FIG 62 NEUTRAL SENSOR SECONDARY DISCONNECT BLOCKS 47 w w w E l e c t r i c a l P...

Page 226: ...Screws 3 Stud Connector 4 Current Sensor d When replacing the stud connector tighten the Allen head screws to 250 10 in l bs Tighten the clamping bolt as fol lows AKR 30 30H 1 20 1 0 in lbs AKR 50 50H...

Page 227: ...hould be replaced When making the electrical con nector to the replacement unit it is recommended that the brea ker harness be cut at some conven ient point and the new actuator leads solder spl iced...

Page 228: ...ctuator 4 Trip shaft 2 Trip rod adjuster end 5 Actuator arm 3 Trip paddle 6 Reset linkage FIG 65 FLUX SHIFT TRIP DEVICE COMPONENTS TRIP PAJDLE IN MECHANISM RESET POS I T I O N 0 109 031 Dia rod JAM NU...

Page 229: ...ransformer will generate an unwanted ground fault output signal which will trip the breaker This can be nullified either by a testing two poles of the breaker in series or b using the Ground Fault Def...

Page 230: ...THE CURRENT SENSORS ALLOWING DANGER OUS AND DAMAGING VOLTAGES TO DEVELOP Test scope 1 Verify the time current characteristics and pickup calibration of the various trip elements 2 Verify operation of...

Page 231: ...c Verify that the harness connections to the sensors meet the polarity constraints indicated by the cabling dia gram i e white wire to COMMON black wire to TAP d On G round Fault breakers serving 4 wi...

Page 232: ...GRAMMER CONNECTOR AMP 201 298 1 AMP 201 297 1 FIG 69 CABLING DIAGRAM SST WITH G ROUND FAULT ON 3 WIRE LOAD cp A B C A A A BREAKER 1 4 1 BACK FRAME 1 b b I I FLUX SHIFT TRIP DEVICE PROGRAMMER UNIT I A...

Page 233: ...GROUND FAULT ELEMENT FIG 71 CABLING DIAGRAM WITH G ROUND FAULT DEFEAT CABLE INSERTED BETWEEN BREAKER HARNESS AND SST PROGRAMMER UNIT FOR USE DURING SINGLE PHASE HIGH CURRENT LOW VOLTAGE TESTING 55 w w...

Page 234: ...tings wh ich span the same range as SST see Fig 74 3 Neutral sensors are not required because there is no Ground Fault function In all other respects the ECS Trip device system operates and can be tre...

Page 235: ...mum 4 3 4 L 0 095 AKRT 50 2000 800 1200 1600 2000 CD Pickup tolerance is 9 Pickup tolerance is 10 Time delay shown at 600 of long time pickup setting 6L at lower limit of band Time delay shown at lowe...

Page 236: ...LAY I t I I INSTANTANEOUS I PICKUP I I l r I I I ili GROUND FAULT I SUMMING f PICKUP CIRCUITRY I NCT N DELAY El J I t I d 1 I 0 2 REGULATED I 15 VDC 0 3 POWER SUPPLY I L _ _ _ _ _ _ _ _ _ _ FIG 76 MIC...

Page 237: ...ey provide the necessary alignment for the connector engagement The locking lever engages with the pin which is assembled to the programmer frame and secures the pro grammer to the mounting bracket Th...

Page 238: ...MicroVersaTrip option H option is required Fig 84 shows an H option phase sensor When the H option phase sensor is installed there are fou r leads connected to it two flag terminal connections additi...

Page 239: ...Sensor Multiple Delay Maximum Sensors Sensors Current of Current D Frame Rating Rating Rating Seconds Size Amps Sensor fJt Rating X C 100 1 50 100 150 225 300 5 6 7 8 9 2 5 5 AKR 30 800 225 300 or 8 8...

Page 240: ...pTM Trip Device Cont 62 TAPPED COMMON TER M I NAL FIG 83 MICROVERSATRIPr PHASE SENSORS AMPERE RATING CONNECTIONS FIG 84 H OPTION PHASE SENSOR FIG 85 TYPICAL NEUTRAL SENSOR w w w E l e c t r i c a l P...

Page 241: ...e stud connector from the contact pivot block c Loosen the clamping bolt and remove the stud con nector Lift out the sensor and its tap terminal board The sensor may be prevented from slipping off the...

Page 242: ...uit breaker can be opened and closed normally from the test position attention can be directed to the trip device proper Testing is performed by either of two methods 1 Conduct high current single pha...

Page 243: ...output sufficient to trip the breaker Similarly discontinuity between any sensor and the programmer unit can cause a false trip signal If nuisance tripping is encountered on any breaker whose MicroVer...

Page 244: ...r r r LOAD I_ _ _ _ _ _ HARNESS CONNECTOR PROGRAMMER AMP 1 350356 9 CONNECTOR FIG 89 CABLING DIAGRAM MICROVERSATRIP WITHOUT G ROUND FAULT q A q s q c A A _A s E r1 t l I LEFT POLE I CURRENT SENSOR I...

Page 245: ...ERSATRIP WITH GROUND FAULT ON 4 WIRE LOAD 4 WIRE LOAD 1 1 1 BREAKER 1 BACK FRAME I b I I FLUX SHIFT TRIP DEVICE PROGRAMMER UNIT r 1 o o1 tl EQUIPMENT MOUNTED I NEUTRAL SENSOR I I A I NEUTRAL I SENSOR...

Page 246: ...I I I I I TI1 I 0 I ANY MICROVERSATRIP I 0 I PROGRAMMER UNIT WITH I 0 I GROUND FAULT I 0 ELEMENT I I I I I I I 4 o I I J I L l I L _ _ _j FIG 93 CABLING DIAGRAM WITH GROUND FAULT DEFEAT MODULE INSERTE...

Page 247: ...i 0 0 BLUE BLUE I I I I I I I I I l_ _ _ _ _ _ _j AMP 1 350239 9 AMP 1 350246 9 AMP 1 350242 9 AMP 1 350235 9 FIG 95 CABLING DIAGRAM REMOTE FAULT INDICATION PROGRAMMER SECONDARY DISCONNECT EQUIPMENT B...

Page 248: ...ring no external relaying power supply or accessories See Table 1 5 for trip functions available and Table 1 6 for trip function characteristics A detailed description of each trip function is given i...

Page 249: ...CURRENT SENSORS The current sensors supply the power and signal input necessary to operate the trip system Like the MicroVersaTrip the RMS 9 and Epic MicroVersaTrip uses a phase and neutral sensor Fig...

Page 250: ...etting S X C 1 50 5 6 Fixed at 400 7 8 1 0 of 800 9 95 Current 1 0 1 1 Setting 5 6 Fixed at 800 7 8 1 0 of 1 600 9 95 Current 1 0 1 1 Setting 5 6 Fixed at 2000 7 8 1 0 of 9 95 Current 1 0 1 1 Setting...

Page 251: ...and therefore is separately mounted in the cable or bus compartment The outputs of the phase sensors and neutral sensor are connected to a programmer circuit which sums these values The total value wi...

Page 252: ...ce it has been established that the circuit breaker can be opened and closed normally from thetest position attention can be directed to the trip device proper Test ing is performed by either of two m...

Page 253: ...k that the neutral sensor is properly connected see cabling diagram Fig 1 07 In particular 1 Verify that the neutral sensor has the same rating as the phase sensors 2 Check continuity between the neut...

Page 254: ...AL I I I A H I I NEUTRAL I Dl g CT a 1 I I LOAD J H c co I I _I I 4_ J RED I C02 WHITE 28 18 22 19 23 fffi 24 A 1 7 I I I I I I I I I I I I I L N v J J r I_ _ _ _ _ __ c LOAD HARNESS CONNECTOR AMP 1 3...

Page 255: ...with high range instantaneous MicroVersaTrip PM Trip Unit The MicroVersaTrip PM trip unit adds power manage mentsystem capability advanced metering and protective relays to the basic functions of the...

Page 256: ...cuit breaker and equipment circuity This plug is called the trip unit disconnect CAUTION Removal of a trip unit from its breaker must be performed with the breaker in the OPEN or TRIPPED position Draw...

Page 257: ...racket When a trip unit is replaced the locking arm snaps back into place to indi cate proper alignment WARNING Always de energize Type AKR circuit break ers before attempting to remove or replace the...

Page 258: ...cted to this common terminal All phasesensors must be correctly wired forthe programmer summing circuitry to function properly 80 TAPPED FIG 1 16 The fixed phase sensors are available with an addition...

Page 259: ...e as integrated circuit DIP extractors Grasp the rating plug tabs with the extractor and pull the plug out Be sure to grab the tabs and not the front cover of the rating plug or the plug may be damage...

Page 260: ...t protection High range fixed instantaneous overcurrent protection Short time protection with or without 12T Ground fault protection with or without 12T Zone selective interlock with ground fault only...

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