Allis-Chalmers MA-150, Instruction Book

Page 1: ...CTION BOOK TYPE D MOVABLE PORTION MA 75 l50 250B RUPTAIR MAGNETIC POWER CIRCUIT BREAKER AND AUXILIARY EqUIPMENT STORED ENERGY OPERATOR September I 1966 Book No BWXw6657w2 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: ...205395 AALLIS CHALMERS Front side view of Type 0 4 16 kv 1200 Amp Air Magnetic Circuit B reaker 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 3: ...205389 AALLIS CHALMERS View shows application of fifth wheel on Type D Air Magnetic C ircuit B reakers 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 4: ...AALLIS CHALMERS 217530 Side view of Type D 4 16 kv 1200 Amp Air Magnetic Circuit Breaker Outer Phase Barrier 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 5: ... 217525 AALLIS CHALMERS Arc Chute Assembly of Type D 4 16 kv 1200 Amp Air Magnetic Circuit Breaker is tilted back for easy assembly of contacts 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 6: ... 3 5 MAIN TOGGLE ROLL 3 6 TRIP LATCH 3 7 CLOSING LATCH 3 8 TRIPPING AND CLOSING SOLENOID 3 9 AUXILIARY EQUIPMENT 3 10 AUXILIARY SWITCH 3 11 INTERLOCK PLUNGER 3 12 OPERATOR CONTROL 3 13 I RESET RELAY 3 14 t PART 4 DISCONNECT SECTJnN BREAKER MECHANISM 4 1 CONTACTS 4 2 r t SERVICING CONTACTS 4 2A I BREAKER TIMING 4 3 q ARCING CONTACT HINGE JOINT 4 4 CONTACT PRESSURE ON HINGE JOINT 4 5 CONTACT ALIGNME...

Page 7: ...TOR TYPICAL CONTROL SWITCH TYPICAL AUXILIARY SWITCH TYPICAL OPERATOR LINKAGE DIAGRAM FRONT SIDE VIEW OF TYPE D 4 16 kv 1200 Amp AIR MAGNETIC CIRCUIT BREAKER VIEW SHOWS APPLICATION OF FIFTH WHEEL ON TYPE 0 AIR MAGNETIC CIRCUIT BREAKER SIDE VIEW OF TYPE D 4 16 kv 1200 AMP AIR MAGNETIC CIRCUIT BREAKER TILTING BACK ARC CHUTE 7 1 40 1 645 40 1 7 1 40 1 520 40 1 7 1 40 1 522 40 1 72 320 030 40 1 72 420 ...

Page 8: ...nt is being carried through the main contacts As the movable contact assembly separates from the stationary contact assembly the current transfers very quickly from the main contacts to the arcing contacts thus keeping the main contact erosion to a minimum For breakers equipped with tertiary contacts the current transfers from the mains to the tertiary and then to the arcing contacts As the movabl...

Page 9: ... closing device of breaker should be used for preliminary operation to see that all parts are free and work smoothly The bushings and other insulating parts should be clean and dry All contact surfaces should be inspected to see that they are clean and smooth Do not dress silver surfaces Removal of all phase barriers and removal or raising of arc chute assemblies gives access to breaker for checki...

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Page 11: ...10 go over toggle At the start of this operation J inks 4 9 will be in tension allowing a gap between latch 4 13 and its rol I 4 19 However part way through the charging operation as the springs are being charged the action of roll 4 19 coming against latch 4 13 will be heard The action of Iinks 4 9 and 4 10 going over toggle wil I be heard at the end of the charging operation Releasing closing la...

Page 12: ...ne1 grzrng the trip circuit This rotates latch 4 27 allowing the c losing J inkage to collapse and reset The tripping action described above can take place at any time during a closing operation either manual or electrical and regardless of whetner or not the armature is energizedo Thus the mechanism is electrically and mechanically trip free in any position 3 5 LY SlOW CLOSiNG BREAKER In order to...

Page 13: ...N AS THE CONTACTS APPROACH THE BREAKER CLOSED OSIT OIN OBSERVE THE POSITiON OF CRANKS 4 4 ON ROLLS 4 24 CARE SHOULD BE TAKEN THAT THE CRANKS DO NOT PASS BY THE ROLLS ALLOWING THE CONTACTS TO SNAP OPEN Since the motor gears are se l f locking the contacts can be cranked to any position and held for adjustment checks e To p repare for normal ope r a t i on Trip breaker open Remove spring charging ha...

Page 14: ...G SOLENOID The tripping solenoid 4 36 and the closing solenoid 4 37 action and adjustments are identical Each solenoid has been adjusted in the factory and should require no further adjustment If readjust ment is required it should be made only when the trip and closing latch bites are in correct adjustment see Sections 3 7 and 3 8 The armature should move freely and have no binds The travel of th...

Page 15: ...6 to 1 13 16 above the floor line and causes tripping of breaker contacts when it is raised to a level not more than 2 1 16 above the floor line The latch tripping rod associated with the foot lever should be clear of the trip latch 4 27 by 1 32 to l 16 Adjustment is made by changnng the effective length of the yoke attaching the foot lever to the interlock plunger The Interlock rod 4 3 1 should n...

Page 16: ...ate the motor at rated and minimum voltage and I imit the coast of the motor so that the pin on the gear coasts past top center but not beyond 10 o cJock With too much resistance the motor will stall With too I ittle resistance the motor wiII coast too far and the cam wilI reclose the 88 3aa switch and the motor will continue to run 3 14 RESET RELAY For instantaneous Reclosure Service Only The ALL...

Page 17: ...ceeds a precise level VF I n other words the UJT does not allow current to flow from point E to point BJ until the UJT is turned on by the fi ring voltage VF The voltage drop Vc across the terminals AB charges the capacitor C J through the variable resistor RJ The time that it takes the capacitor c1 to charge to the firing voltage VF of the UJT is the time delay and is controlled by the variable r...

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Page 19: ...n after the pulse is removed The relay contacts R close allow ng current to flow through the spring release coil circuit The gate terminal of the SCR is ptot cted from random high frequency pulse by capacitor c2 which provides a short circuit to ground for these pulses In other words the reactance of the capacitor C2 is neg igible at high frequencies and the capacitor allows current to flow throug...

Page 20: ...f closing latch 13 For Parts Identification See Figure 4 II Driving cranks 4 turning counterclockwise have gone overcenter throwing links 9 into compression with latch roll 19 against closing latch 13 If latch 13 does not pick up the load I ink 9 wi I I move forward allowing rolI 24 to go around driving crank 4 to position as shown in 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 21: ...y overtoggle springs are fully charged and will snap 1inks 9 and 10 overtoggle against the stop IV IV Driving cranks 4 have rotated free 1inks 9 and 10 are overtoggle springs fully extended ready for close when closing latch 13 is released 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 22: ...h rol l 1 9 forces togg le ro ll 15 forward lith latch roll 14 he ld by trip latch 27 the breaker wi11 c lose VI V I The togg le rol l 15 is overtoggle against stop 59 Screw 32 has come in contact with crank 12 forcing 1ink 10 to rotate breaking the togg le between I inks 10 and 9 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 23: ...ation Breaker has just been tripped Tri p latch 27 has released latch roll 14 allowing it to rotate Links 20 and 21 drop almost vertically until stop 59 forces toggle roll 15 back to break the 1ink 20 21 toggle and allowing the 4 bar 1inkage to return to normal position as shown in Ill IV 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 24: ...inge joints Remove the disconnect arms as a unit by removing screw 3 24 nut 3 14 and spring washers 3 23 Careful ly inspect a l l contact surfaces Si lver washers 3 25 and adjacent surfaces should be c lean and free of roughness or ga lling Lubricate washers 3 25 and mating surfaces by rubbing in microfine dry graphite used spar ing ly Remove excess graphite Reassemb le adjusting hinge joint press...

Page 25: ...nt should normally be necessary The horizontal pairs of main contact fingers in each phase should 11make11 with the moving contact simultaneously Note Contacts on different phases should not necessarily 11make11 simultaneously they can vary as much as 1 32 inches If not already detached remove pin 1 46 and detach link l 47 from disconnect arms 3 18 and C 19 On MA 75 1508 and FC 150 250 500 Breaker...

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Page 27: ...en the bottom contact fingers 3 1I and the contact on the disconnect arms 3 18 and 3 19 should be 7 32 to 1 4 inches Dimension b in View A A of Fig 3 Adjustment is made by opening or closing th gap with nut 3 1 Reconnect Iink 1 47 to disconnect arms 3 18 and 3 19 using pin 1 46 4 8 CONTACT STROKE Fig 3 Contact stroke should be checked and adjusted only when the contacts are in proper alignment see...

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Page 29: ...oosening nut 1 42 increase or decrease effective length of rod end 1 40 by screwing or unscrewing it into piston stem J 44 Adjust rod ends 1 40 on both puffers the same amount Tighten nuts 1 42 replace pin 1 33 and check dimension 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 ...

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Page 31: ...e barrier stack d The barrier stack 2 23 consisting of a number of refractory pi ates with Vee Shaped sIots cemented together The barrier stack cools squeezes and stretches the arc to force a quick interruption e The barrier 2 1 containing coolers 2 28 through which the by product gases of interruption pass The barrier completes the cooling and deionizing of the arc products Arc chutes are normall...

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Page 33: ...re tightened securely on all three phases 5 4 BARRIER STACKS Fig 2 The barrier stacks are fragile and should be handled carefully The barrier stacks should be inspected for erosion of the plates in the areas of the slots The stacks should be replaced when a milky glaze is observed on the full length of the edges of most of the slots They should be 1ikewise replaced if plates are broken or cracked ...

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Page 35: ...ONLY ARC CHUTE SEE FIG 2 c 25 II II 1 II I INNER PHASE 5 IIi II II II J BARRIER OUTER PHASE 7 o 1111 BARRIER FIG I II II I 1 t c I 0 I o I I I I _ _______J II I I I TYPICAL MAGNETIC BREAKER JULY 9 1966 71 401 645 401 GUIDE TUBE D J F I n r J E l e c t r i c a l P a r t M a n u a l s c ...

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Page 37: ... I I I I I I I I I I I 28 COOLERS l I l1 I II 0 BARRIER MOVING END ARC RUNNER II II II I I 11 1l I I I I I I I I I I I I I I v COIL FRONT 0 0 0 FIG 2 TYPICAL ARC CHUTE JUNE 11 1962 71 401 520 401 I I I u I D J en I n z ITI en E l e c t r i c a l P a r t M a n u a l s c ...

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Page 39: ...GER 0 MA 75 150 B ONLY ARCING CONTACT MOVING Y OKE 7 PIN YOKE NUT S I LVER WASHER 25 FIG 3 TYPICAL STUD 8 SUPPORT JUNE 13 1962 71 401 522 401 VIEW B B VIEW A A ARCING CONTACTS ENGAGING VIEW A X BREAKER LATCHED VIEW A A MAIN CONTACTS ENGAGING D J I n 1 J E l e c t r i c a l P a r t M a n u a l s c ...

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Page 41: ...4 PIN LINK 9 LINK 61 l 75 SCREW 19 v 22 ARM FIG 4 SE 4 STORED MAY 19 1966 ENERGY OPERATOR 72 32 0 030 40 I 31 INTERLOCK ROD PIN ARM LINK SHIM STOP LINK HEX NUT TRIP SOLENOID I TRIP COIL n 1 SPACER TRIP PIN TRIP s LATCH SCREW SPRING 26 _PIN w E l e c t r i c a l P a r t M a n u a l s c ...

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Page 43: ... 0 MOTOR CUT OFF CLOSE CIRCUIT 6 SWITCH LEVER I ADJ SCREW LOCKNUT B I 5 PIN ji M FIG 8 TYP ICAL CONTROL SW ITCH JULY 27 1966 72 420 020 4 0I _ 3 ADJ SCREW 4 _ LOCKNUT C D J E en I n l J J en w E l e c t r i c a l P a r t M a n u a l s c ...

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Page 45: ... BARRIER l 2 STATIONARY_ I CONTACT SHELL ROTOR ASSEMBLY FIG II MOUNTING BRACKET TYPICAL AUXILIARY SWITCH JULY 16 1958 71 301 758 CRANK ARM II MOUNTING BRACKET l I n z AJ w E l e c t r i c a l P a r t M a n u a l s c ...

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Page 47: ...tTCH HOLDING MAGNET STO IJ E I oJ TRIP ARMATURE 16 B HOOK LATCI 13 LINKAGE RESET 6 _ SPRING 4F OPEN FIG I3 SPRING iF TRIP REI LATCH CLOSED FIG 14 TO BREAKER I A STOP II ha Q I 7 IS BREAKER OPENING SPRING HOl DING TRIP CoiL 14 A6HIET K J TRIP ARIV1ATURE HOOK LATCH 13 9 If t 1 LINKAGE RESET 1 SPRING Ei E TR I t Rt c qTCH TRIP FREE FIG 15 TYPICAL OPERATOR LINKAGE DIAGRAM SEPTEMBER 9 1953 71 400 246 t...

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