Allis-Chalmers LA-25 Instructions For Installation, Care And Operation Download | Manualshive

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Courtesy of NationalSwitchgear.com

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Summary of Contents for LA-25

Page 1: ...r r V M S itv S f i H f VB V V 1 J v S These instructions ahe not intended to cover all details or variations that may he encountered in connection with the installation operation and maintenance of this equipment Should additional information he desired contact the Allis Chalmers Mfg Company AIIIS CHAIMERS MFG CO B O S T O N W O R K S B O S T O N M A S S r r Courtesy of NationalSwitchgear com ...

Page 2: ... 1 r CHALMERS MANUFACTURING ALLIS COMPi Y V v_ r i V Ai si V4 V V t i I S j LA 25 low voltage air circuit breaker 178603 P Courtesy of NationalSwitchgear com ...

Page 3: ...ment F Energizing the Breaker Part III Description and Function of Parts 2 2 3 3 3 4 4 k Operating Mechanism B Contacts Method of Are Interruption D Relays K Trip Units and Accessory Devices Part IV Maintenance Adjustment and Replacement l C 6 7 7 A General B Periodic Inspection C Maintenance Check D Movable Arcing Contact E Stationary Arcing Contact F Movable Main Contact G Stationary Main Contac...

Page 4: ...nd Replacement B Thermal Magnetic Overcurrent Trip Device Assembly Inspection and Adjustment Maintenance and Replacement C Overcurrent Trip Flag Indicator and Reset Part VI Accessory Attachments 11 13 13 U 15 16 16 16 A Shunt Trip Attachment B Auxiliary Switch Attachment C Bell Alarm Switch Attachment D Mechanical Overcurrent Lockout Attachment 17 17 17 m BWZ 6426 Courtesy of NationalSwitchgear co...

Page 5: ...3 Operating Mechanism Schematic 4 5 6 Wiring Diagrams Auxiliary Switch Secondary Disconnect Closing Solenoid Limit Switch Shunt Trip Device Series Trip Device Thermal Trip Device Indicator Flag Mechanical Lockout Bell Alarm Switch and Reset Button tor Overcurrent Trip Devices Series Trip Curves Dual Magnetic Series Trip Curves Dual Selective Thermal Trip Curves 7 9 10 11 12 13 14 15 16 17 BWX 6426...

Page 6: ...READ INSTRUCTION BOOK BEFORE MAKING ANT CHANGES OR ADJUSTMENTS ON THE BREAKER 2 DO NOT INTERCHANGE PARTS OF TRIP DEVICES MAT CHANGE CALIBRATIONS TO DO SO 3 4 ALWATS OPERATE MANUAL CLOSING HANDLE QUICKLT AND DECISIVELT TO HESITATE IN MIP STROKE MAT CAUSE UNDUE BURNING OF CONTACTS CHECK CURRENT RATINGS AND SERIAL NUMBERS AGAINST SINGLE LINE DIAGRAM TO ASSURE THAT BREAKERS ARE PRQPERLT LOCATED IN SWI...

Page 7: ...ginal purchaser This warranty is limited to the furnishing of any part which to our satisfaction has been proven defective Allis Chalmers will not in any case assume responsibility for allied equipment of any kind Receiving and Inspection for Damage air circuit breaker and its associated apparatus is carefully checked inspected and packed at the factory by workman ex perienced in the proper handli...

Page 8: ...ertain that adjustments and connections have not loosened in shipment or handling Before installing breaker make certain it is in the open position and that all packing traces have been removed breaker is shipped blocked in the closed position After breaker is in position close it manually to check proper function ing of the mechanism and contacts CAUTION MAKE SURE CIRCUIT IS NOT ENERGIZED ing res...

Page 9: ...However before changing any adjustments be certain that the trip latch engagement is suffi cient as outlined in the maintenance check list D Trip Units and Accessory Devices These items also should receive a thorough check prior to placing breaker in service to be certain that adjustments are proper and parts are not damaged Refer to Parts V and VI of the instruction book for the description of ad...

Page 10: ...on of cam 12 through action of manual closing lever 10 or by action of solenoid plunger In either case link 13 is rotated counterclockwise about fixed center E The cam face on link 13 acts against cam roll 22 moving it to the right and thus rotating link 14 clockwise about temporarily fixed center D This action moves link 15 to the right thus closing breaker contacts 3 and 4 by clock wise rotation...

Page 11: ...terial prevents welding and sticking when interrupting high currents This insures long satisfactory service s 4 Another feature of the contact structure is the blow on effect produced by the physical configuration of the moving member This is best shown schematically as in Fig 5 The current path when main contacts only are parted is from the arcing contact 5 3 to pivot point X and thence completel...

Page 12: ...contact arrangement aids in prolonging D Relays Relays are used on electrically operated breakers to control the closing power to the operating mechanism and to permit remote or automatic operation of the circuit breaker Two relays are used The X relay 1 4 is energized by the control switch or other means to connect the closing coil to the control power source A seal in contact prevents partial op...

Page 13: ...for the LA 25 breaker The maintenance check list Section C will provide a ready and convenient guide to a thorough and under standing Inspection of the breaker Servicing will be facilitated if a tag is attached to each unit listing date operation counter reading date of next inspection counter reading at next inspec tion and serviceman s signature C Maintenance Check List The following items are 1...

Page 14: ... the bottom Be certain that there is aftertravel in springs 2 32 with the breaker full closed vv v V IS 6 Arcing Contact Hinge Tension Spring washers 2 57 should be compressed to a height of 03 8 002 as measured with 2 58 and flat side of arcing contact 4 feelers between washers 2 24 7 Trip Latch Adjustment Trip latch 2 43 should have a tripping force of 2 to 3 oz as measured at right angles to a ...

Page 15: ...main closing cam 9 1 will have 1 3 clearance to its overtravel stop 9 10 and the prop latch 9 6 face will have l l6rt clearance to the prop latch pin 9 7 After securing the solenoid mounting screws 9 4 and drilling four letter F 257 dia j holes for the locking pins 49 11 but before insert ing pins check breaker open position There should be 1 32 to 1 16 clearance between the end of the armature ca...

Page 16: ... a cloth or other shield to prevent springs from flying free A screw driver may be used to work springs and fingers to the ends of the block for removal Be careful not to raise nicks or burrs or otherwise damage contact fingers Note that spring 2 37 consists of a double inner and outer spring while spring 2 32 is a single spring During reassembly of upper and lower contact blocks there are no part...

Page 17: ...he coil removed After replacing coil mount and adjust solenoid as outlined in section IV C 12 making sure that all connections are made up tight 4 3 PART V PROTECTIVE DEVICES A Series Overcurrent Trip Device Assembly Adjustment and Calibration Series overcurrent trip devices used on low voltage breakers function to trip the breaker whenever the current through the breaker exceeds a predetermined v...

Page 18: ... to the upper chamber through the accurately controlled metering element 12 12 As the armature closes the gap to the core 12 d it engages trip block 2 4d and trips the breaker When the breaker has tripped the armature will reset against stop 12 10 due to tension in pick up spring Quick reset Is provided by means of the check valve 12 13 in time delay device The short time delay element 12 18 funct...

Page 19: ...tamped on the breaker Nameplates and should be checked in applications involving varied current ratings V MAINTENANCE AND REPLACEMENT The individual phase series trip device assemblies j are mounted on a common base and must be removed from the breaker for maintenance or replacement as one assembly To remove this assembly detach the assembly mounting bolts 2 39 and screws 2 47 and 2 49 holding the...

Page 20: ...ph A of section V Figure 13 shows the arrange ment of the functional components of this device and figure 16 illustrates the inverse time delay characteristics Each thermal magnetic trip device is calibrated and tested prior to leaving the factory and should not be disturbed in the field without proper equipment and knowledge of the device The thermal magnetic trip armature pickup is adjustable in...

Page 21: ...on thermal trip armature 13 19 is removed for those applications which require the thermal armature to sound a bell alarm on overcurrent conditions but not trip the breaker Under these conditions the instantaneous trip armature 13 21 must have the trip screw 13 14 properly adjusted for high overload protection For details concerning reset of the bell alarm see section VI G under bell alarm iy j IN...

Page 22: ... torsion spring 14 3 which in turn rotates the reset shaft 14 1 by means of pin 14 2 The pins 14 2 which rotate the reset shaft 14 1 are so located that only the phase or phases which caused the breaker to trip release the flag The flag is then visible at point C to the operater to indicate which phase caused the breaker to trip reset the flags push reset button 14 6 which actuates reset lever 14 ...

Page 23: ...lite cover 7 3 which snaps on can be easily removed for contact inspection C Bell Alarm Switch Attachment The bell alarm switch 14 8 functions to close an alarm circuit upon automatic over current tripping of the breaker or by special application may indicate an overcurrent condition by sounding an alarm without tripping the breaker This switch is a single pole double throw switch mounted on the o...

Page 24: ...he tripped position by lockout lever 14 9 14 9 as explained under section VI paragraph C tripped position by toggle spring 14 16 This prevents the breaker trip latch 2 43 from resetting Since the breaker is mechanically trip free it cannot be closed by any means until the trip latch 2 43 is reset by actuating the reset button 14 6 to reset lockout lever 14 9 C v in the When an over on the This lev...

Page 25: ...8 J5 2 r 10 m 3 SB i HANDLE I2 18 BREAKER NAMEPLATE A VI a j 6jMSPARE AUXILIARY SWITCH AUXIUARY S SWITCH 3 i I I J 1 A 7 KY RELAY X RELAY 4 o r LIMIT JS SWITCH c PROVISION FOR PADLOCK C 3 l SHUNT 2 TRIP C C INTERLOCK TRIP BAR 4 PRIMARY DISCONNECT r r 10J J is GS UNDERVOLTAGE TRIP 6 O 0 i Cl t TO 7 3ir CLOSING 9 SOLENOID 20 64 O I5 SECONDARY DISCONNECT m OVERCURRENT TRIP DEVICE I BELL ALARM SWITCH ...

Page 26: ...4 ARCING CONTACT MOVABLE 25 ARCING CONTACT STATIONARY 36 FRAME 27 SCREW 28 SCREW 29 PANEL BASE 30 STATIONARY MAIN CONTACT BLOCK 31 SCREW 32 MAIN CONTACT SPRINGS 33 MAIN CONTACT FINGER STATIONARY 34 MAIN CONTACT MOVABLE 36 SHIELD 36 SCREW 37 HINGE CONTACT SPRING 38 LOWER STUD CONNECTCft 39 SCREW 40 TRIP UNIT L MANUAL TRIP RESET BUTTON 2 PROP LATCH 3 PROP LATCH SPRING 4 OPENING SPRING 5 MAIN CLOSING...

Page 27: ...OVABLE 3 ARCING CONTACT H TRIP FREE POSITION FIG 4 t h i 18 a fi LEVER RETURN T SPRING MANUAL CLOSE CAM Li LMDSTATIONARY MAIN CONTACT RWWWt 1 L PRIMARY TRIP LEVER A CAM 9 FOLLOWER V A o SOLENOID PLUNGER o SECONDARY TRIP LEVER TO CLOSE 24 SCHEMATIC DIAGRAM OF TYPEULA OPERATING MECHANISM T Tfttp LATCH o OPEN POSITION FIG 5 CLOSED POSITION FIG 3 ...

Page 28: ... TY2 raa HUD i t _a _Q 7 T Y P I C A L W I R I N G D I A G R A M F O R E L E C T R I C A L L Y O P E R A T E D B R E A K E R S FIG 6 A A C B X ar bla S E R I E S T R I P C O I L S N A A 2 17 T Y P I C A L W I R I N G D I A G R A M F O R M A N U A L L Y O P E R A T E D B R E A K E R S FIG 6 B y V j v Courtesy of NationalSwitchgear com ...

Page 29: ... O O O I ROTOR ELEMENT g t J I I i i uJ LJ LJ AUXILIARY SWITCH FIG 7 J CONTACT FINGER 3 SPRINGrE IS ffti 1 v V j FERMINAL T4 A 6 SECONDARY BLOCK TI BI 532SS H rr f v T s 2fS j A A A A A A A fj rcrrn rcz RCLZT ncnn rggr i i a I S i i f K J r TZTET I J c r w os tr1 y SECONDARY DISCONNECT ASSEMBLY FIG 8 Courtesy of NationalSwitchgear com ...

Page 30: ...SOLENOlO ASSEMBLY SOLENOID fl3 ARMATURE COIL SUPPORT C i 14 J SOLENOIO ARMATURE STOP 16 CLOSING COIL 9 CLOSING SOLENOID 2AA STATIONARY CONTACT T MOVABLE CONTACT j e ttrw J CAM I TING SCREWS 6 711 V r Vt CZT r H ITrtt jjcrr Jc 7VJSWITCH MOUNTING X SCREW CAM FOLLOWERH2 I i I PLUNGEFHiO 3 V INSULATING BARRIER m SHIM 7 33 1 L_ TV LIMIT f SWlTCH FIG 10 LIMIT SWITCH CLOSED POSITION r TORSION 1 SPRING AR...

Page 31: ...EW DUAL MAGNETIC TRIPDEVICE LONG TftvIE a INSTANTANEOUSELEMENTS BOTTOM VIEW DUAL SELECTIVE TRIP DEVICE LONG a SHORT TIME ELEMENTS z m SERIES C01L 71 CORE 8 HCORE MTG yT SCREWS B ARMATURE STOP n a z TRIP SCR W 9 1 CHECK VALVE 13 X J i b o l _ WrlT METERING ELEMENT I t i J l Y TIME DELAY DEVICE PLUNGER I v Ai o K v t ADJUSTING KNOB 2 BOTTOM VIEW SERIES INSTANTANEOUS TRIPDEVICE ADJUSTABLE100 200 PICK...

Page 32: ...p FUG R ARMATURE V LOCKING SCREW 17 SHAFT i ADJUSTINGJ72 SCREWS xS SC TRIP a a jQ 31 NAME PLATEH4 VTi i i r 6JMETALL1C v o o I I l c i A ivx X 1 V l A W w I V o I I I l t Z 7 y c i 2HHEATER COiL 1 I 1 T I A O t w f v i ROUL 7 SEOlNpARY COlL fl TERMINALS V TO SECONDARY ARMATU COL SHAFT T CORE MOUNTING iir SCREW 5 THERMAL MAGNETIC OVERCURRENT TRIP DEVICE FIG 13 z Courtesy of NationalSwitchgear com ...

Page 33: ...ESET BUTTOR S RESET BUTTON STOP iSV SfftlfS COIL LI 4 SPRING fO RESET LEVER S Q f LOCKOUT BAfl 22V TIW SHAFT I V SpV rfUP BAR UF ARMATURE TRIP ivERCURRENT TRIP ARMATURE G W LOCXOUT L VER S ZU ELAG RELEASE SrtAPT Z 12 CORE ASSEMBLY v F t SELL ALARM SW TCM B B i 70 1 4 O o o FIG 14 INDICATOR FLAG MECHANICAL LOCKOUT BELL ALARM SWITCH a RESET BUTTON FOR OVERCURRENT TRIP DEVICES o i ...

Page 34: ... 71 w S 4 P1 a rnn I U Ii TT n rt 2 T 7 h jnua tnffiw I W tUl 1 1 M I ia II 4M I r o si 4 1 t u LttigE TP n I S 5 ill rt II 1 h 1 I NSTANTANEOUS CALIBRATION ADJUSTABLE BETWEEN 5 a 15 TIME BREAKER RATING r Ml V ik J HJ 2 3 FT cn hi i T i Tr W SB fl allj iiif CSi i v rV 1 O o Ui FP r ir n g fs r HH Jrl h z l r vh ki in S x 7 I P 1 J s m Tv u4 kniu kp Hl LT y r FFgg J Pi f f m v n L h 2 t u r n MI p ...

Page 35: ...x itf u i 1 T Pggpg r r 7 V rr r r r T 4 5 i f k n r M E rf r i a 1 i r a T rr ITTlL f f tHi T P K i 9 EM V i r t UlE itep s 4HW j j la 32 LL ML KT i I 1 I 1 J i i rj H f W F I f y KeIkiL p U fe nj Hitp fillip T r q li lih tii T l r PM n F I r EEi i 4 TYPICAL TIME CURRENT CHARACTERISTIC DUAL SELECTIVE TRIP DEVICE LOWER BAND LIMIT DENOTES RESETTABLE TIME 0ELAY ON SHORT TIME DELAY ELEMENT RESETTABLE...

Page 36: ...TO 1200 NORMAL RATI NS UNLESS OTHERWISE SPECIFIED UU t 3 5 3 0 2 2 w 2 0 2 r CALIBRATION 1 0 9 120 SETTING 100 SETTING 8 7 6 80 SETTING 5 4 2 25 80 100 200 PERCENT NORMAL RATING 300 400 600 800 1000 i y FIG I7A TYPICAL TIME CURRENT CURVE THERMAL TRIP DEVICE 71 240 1 79 NOV 4 1955 Courtesy of NationalSwitchgear com ...

Page 37: ... MOVABLE 6 2 24 71 240 002 00 501 3 6 2 24 71 240 002 00 502 3 2 21 ARC CHUTE 7I 34O OI3 OO 5OI 1 3 6 SPRING WASHER 2 57 71 140 014 00 001 2 OVERCURRENT SERIES TRIP COIL 7I 24O O6I CUSTOMER TO S P E C T F T T U T T N O 12 7 71 340 028 00 501 12 14 LONG TIME DELAY DEVICE 0 71 340 02 00 502 12 19 SHORT TIME DELAY DEVICE m 14 8 w 666 202 BELL ALARM SWITCH 1 8 3 410 71 140 168 00 501 SECONDARY CONTACT...

Page 38: ...Courtesy of NationalSwitchgear com ...

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