Allis-Chalmers LA-600, Instruction Book

Page 1: ...ALUS CHALMERS INSTRUCTION BOOK AIR CIRCUIT BREAKER TYPE LA 600 V APRS Lj 1967 BWX 6637 5 h Courtesy of NationalSwitchgear com ...

Page 2: ...BSERVED E INSTALLATION F STORAGE Go MAINTENANCE H o RENEWAL PARTS SECTION II OPERATION A DESCRIPTION 1 Manually Operated Breaker Electrically Operated Breaker o 2 RACKING MECHANISM DRAWOUT INTERLOCK AND LIFTING BAR B SECTION III V A MAINTENANCE B LUBRICATION C MAINTENANCE CLOSING D CONTACT REPLACEMENT SECTION IV A INTRODUCTION 1 SELECTION OF SETTINGS 2 RELEASE MAGNET 3 Courtesy of NationalSwitchge...

Page 3: ...CKS AND CALIBRATION MARKS FOR STATIC TRIP DEVICES PORTABLE TEST SET FOR STATIC TRIP DEVICES TYPICAL TRIP CURVES SELECTIVE STATIC TRIP TYPICAL TRIP CURVES DUAL STATIC TRIP CONNECTIONS FOR FUNCTION TEST TYPICAL RELEASE MAGNET TYPICAL SECONDARY DISCONNECTS TYPICAL AUXILIARY SWITCH TYPICAL SHUNT TRIP TYPICAL UNDERVOLTAGE DEVICE TYPICAL BELL ALARM MANUAL RESET TYPICAL BELL ALARM ELECTRICAL RESET 1 2 2A...

Page 4: ...nd C RECEIVING AND INSPECTION FOR DAMAGE immediately upon receipt of this equipment carefully remove all packing traces and examine parts checking them against the packing list and noting any damages incurred in transit If such is disclosed a damage claim should be filed at once with the transportation company and A Hs Chalmers notified D CAUTIONS TO BE OBSERVED IN THE INSTALLATION AND OPERATION O...

Page 5: ...uld receive a thorough check prior to placing the breaker In service to be certain that adjustments are proper and parts are not damaged 3 Cubicle mounted breakers of the drawout type are equipped with a draw out interlock to prevent movement of a closed breaker into or out of the connected position See Section II of the Instruction Book for a description of the interlock Its operation should be c...

Page 6: ...RS J 118 W 7 IT 1 031 r i OH Tut M 9CVT 4000 X DISCONNECTS cm r lo T i f L_LX1 4 C62 3 6S7 AUX SWITCH ATTACHMENT j C44 TW V T5 t33 5 4 SUPPORT 1062 X RACKING CRANK FREE POSITION 625 CPES POSITION J MW 4 n 1 c WASHER T m SECONDARY DISCONNECTS H2 J D 06 it aSt i SPRING RELEASE LATCH 73 BSWiF r i fcS posmo 4300 fci Q HI 500 z RAIL MAXIMUM IELE 7WWEL 750 1 2230 VERTICAL TRAVELTO TWP437 ELECTRICAL SPRI...

Page 7: ...GE 22L SCREW 222 RACKING SCREW 223 CLEVIS 224 RAIL 225 LINK 226 PIN 227 PIN 228 SPRING 210 CLOSING CAM 202 SPRING RELEASE LATCH in 202A HOOD 211 PAWL 203 SPRING 212 SPRING 204 SPRING 213 TOGGLE LINKAGE 205 ROLLER 214 NUT 215 TRIP SHAFT 4 206 PIN 207 TRIP ROD 216 TRIP LATCH 208 CAM FIG 2 TYPICAL OPERATING MECHANISM MANUALLY OPERATED BREAKER v 72 340 014 401 MARCH 2 1967 W ...

Page 8: ...se toggle linkage 213 and 220 At the same time trip latch 2 16 Is reset by torsion spring 228 as shown in Detail Bn Pushing down spring release latch hood 202A after the closing handle is returned to the normal vertical position releases the energy in springs 209 Through link 22 5 closing cam 210 is rotated counterclockwise against roller 219 which moves toggle linkage as shown in Detail C 1 to cl...

Page 9: ... SWITCH 231 ARM 232 MOTOR CUT OFF SWITCH 233 PLUNGER FIG 2A TYPICAL OPERATING MECHANISM ELECTRICALLY OPERATED BREAKE 72 340 017 4 01 MARCH 10 1967 f I LCS i T r ID lo8 r o 2 A 1 5 4 3 N s 3 O J 3P9 I o 7 N T 0 toeb u t V 10 9 4 a b Yl J o I 7 t AH XI Xft 5 4 TRANSFORMERS MAGNETIC TrtlP COIL F Tf 6 o TERMINAL BLOCK TYPICAL WIRING OIACRAM FOR EL ECTRICAL LY OPERATED BREAKERS FIG 3 bS 3 401 WAftOW fO...

Page 10: ... charged with the gearing disengaged The1 motor cut off switch is actuated by the movement of plunger 233 over pins 236 Approximately twelve seconds are required for completion of the spring charging cycle The breaker may now be closed by pushing down spring release latch hood 2Q2A as In the manually operated breaker or it may be closed electri cally through remote close control switch spring rele...

Page 11: ...L SWITCH FRONT VIEW ELECTRICALLY OPER BREAKERS J OJ r CUBICLE FIXED PIN r c iv J o v RACKING CLEVIS 408 rs 1 1 1 l lr X I TRIP ROD t i i r n CV J l J UT 0 SITURLOCK CAM 408rlNTERL0CK TRIP SHAFT MOT SIDE VIEW FIG 4 TYPICAL RACKING MECHANISM DRAWOUT INTERLOCK 72 440 010 40I APRIL 3 1967 Courtesy of NationalSwitchgear com ...

Page 12: ... be pushed along the rails to the DISCONNECTED position At the same time the racking clevises 405 should be checked to see that they are in correct alignment with cubicle fixed pins 403 Counterclockwise rotation of the operating crank will now rack the breaker Into the TEST pnd connected positions At the TEST and connected positions interlock 4o8 is in its normal horizontal position By removing op...

Page 13: ...ergy springs 4 Remove arc chutes and examine for burned cracked or broken parts 5 Wipe the contacts with a clean cloth saturated with a non toxic cleaning fluid 6 Replace badly burned or pitted contacts See paragraph 7 Wipe all Insulated parts with a clean cloth saturated with a non toxic cleaning fluid 8 Bearing p lns and other sliding or rotating surfaces should be cleaned and then coated with a...

Page 14: ...LATCH HOOD 205429 i TYPICAL MAINTENANCE CLOSING HANDLE ELECTRICALLY OPERATED BREAKERS i STEP 1 STEP 2 205450 MANUAL TRIP ROD REFER FIG 2 DETAIL D REFER TABLE 5 PG 7 TYPI CAL MAINTENANCE CLOSING HANDLE PROCEDURE FIGURE 5 MAINTENANCE CLOSING Courtesy of NationalSwitchgear com ...

Page 15: ...ker the actual maintenance closing operation fs the same for both the electrically operated breaker and the manually operated breaker Refer to Table 3 and Figure 5 TABLE 3 MAINTENANCE CLOSING CLOSING CONTACTS 2 Place blade of screwdriver between hood and spring release latch Push down spring release latch and hold it in this position Pull closing handle DOWN ALL THE WAY approximately 120 and SLOWL...

Page 16: ...tact mating stationary contact when the breaker is closed by the main tenance closing method should not exceed 062 screws in any one phase touching the ee Table 3 the phase to phase variation Adjustment may be made by positioning as in paragraph 2 but i t is essentia that the main contact compression be maintained within the tolerance listed in paragraph 2 Arcing contact pressure should be between...

Page 17: ...630 CONNECTOR 619 CONTACT FINGER 620 ARCING CONTACT 621 NUT 622 ARC RUNNER 623 SPRINGS 624 SCREW 601 PIN 602 SPACER 603 PIN 604 SPACERS 605 STRAP 606 PAN 607 BASE 606 SCREW 609 SPRING 610 SPRING GUIDE 611 WASHER 612 CLEVIS 614 CONTACT 615 SUPPORT 616 STUD 6 7 MAIN CONTACT 618 PIN FIG 6 TYPICAL PANEL ASSEMBLY 72 3 40 020 401 MARCH 8 1667 Courtesy of NationalSwitchgear com ...

Page 18: ... loosening After the contact fingers are replaced connector positioned In the center of the slot in the molded base to assure correct alignment of the primary disconnect fingers 2 Stationary Arcing Contact The stationary arcing contact is a part of connector 629 and may be replaced by proceeding as above In this case screws must be removed However to provide clearance for removal of connector 629 ...

Page 19: ...olic be placed upright in a vise and the open slot in clevis 612 placed against it as a rest The location of spacers 602 604 and 623 shou d be noted To minimize adjustment upon reassembly the position of the two screws 608 relative to pin 618 should also be noted Then the two eiastic stop nuts 621 should be loosened and screws 608 backed off far enough to remove them from pin 618 EXTREME CARE SHOU...

Page 20: ...Is rectified to provide D C energy to the release magnet trip coil and also a regulated D C power supply to operate transistor circuits Potentiometers or rheostats connected in parallel with the auxiliary transformers provide an A C signal voltage proportional to the primary current This acts as the intelligence input for the device and the magnitude of this A C voltage determines whether or not t...

Page 21: ...y curves any combinations of which may be selected by settings on the front plate of the device Selectivity between coordinated circuit breakers can be maintained throughout the full Inter rupting range of the circuit breakers The Model 0 device monitors the currents In each of the three phases The arrangement of the current time curves is shown in Figure 70 Selective Model DG Same as the Model D ...

Page 22: ... Therefore the circuit will carry up to 200 Amps without tripping the circuit breaker Above 200 Amps a trip operation will occur EXAMPLE The pick up selection Is continuous and may be set between marks if desired Usual practice is to set all pick up knobs at the same mark but this is not necessary and different phases can have different pick up settings The rating of the circuit breaker depends so...

Page 23: ...und pick up setting 40 80 Amps An actual ground current of 320 Amps is flowing 320 Amps ground current is four times 4X pick up and will cause a trip operation in four and one half seconds on the minimum time band as shown on the current time curve Figure 7E However this ground current is much less than the phase pick up setting and would not be recognized on the phase pick ups The lower limit of ...

Page 24: ...are two groups of time bands provided one for long time delay and one for short time delay corresponding to the curves on Figure 7D The knob at the middle of the left side on the Models D DG front plate is a three position switch marked to indicate LONG TIME BAND The three positions provide for selection of a MINIMUM as shown on Figure SETTING INTERMEDIATE or MAXIMUM TIME BAND 7 The knob at the up...

Page 25: ...tween 200 Amps and 2000 Amps w i l l t r i p the breaker after a time delay defined by the maximum long time curve Figure 70 Currents above 2000 Amps w i l l t r i p the breaker In the time indicated by the minimum short time curve If the phase pick up settings were changed to 8 200 Amps then the shert time band would be used for currents of 2500 Amps and above Courtesy of NationalSwitchgear com ...

Page 26: ...w and slipping it off the shaft Then be sure the shaft lock is loosened see Figure 78 and turn the shaft counter clockwise as far as it will go Keep the shaft In that position and replace the knob so that it is directly over the red calibration dot Tighten the set screw In the knob the knob may now be turned to the selected With the shaft lock loosened dial position the shaft locked and the device...

Page 27: ...ther information Test Procedures This section will describe in detail the steps to be taken to carry out the tests Tests may be conducted on the complete circuit breaker either in the disconnected cubicle position or removed from the cubicle It is not required to remove or disconnect any permanent wiring on the circuit breaker as long as primary and control circuits are not connected to the breake...

Page 28: ...at the A setting will give faster trip times Settings other than nA require more current to get the desired multiples of pick up e g 3 Amps at E setting is required for 3X pick up The function test may be repeated using terminals 2 4 and 3 4 Model A and D or terminal Model AG and DG It is not recommended to test terminals 4 2 on the Models AG DG since the ground detection transformer circuit has a...

Page 29: ...loaded armature does not reset during trip operation as explained above spacers 808 may be added to obtain positive reset of the armature if adding spacers does not allow armature to be reset the magnetic release latch should be replaced If breaker mechanism Is not at fault Do not attempt to disassemble the magnetic release latch as this will destroy the magnetic field set up by the permanent magn...

Page 30: ... I p S i g fc 1 P Si vl 2i si t El if lh MSIs M l iSfe frf if I i r m Z f I v i a MODEL AG AG 1 DUAL STATIC TRIP DEVICE 205421 MODEL A 1 A 2 DUAL STATIC TRIP DEVICE 205422 L ft I I i S r E A l W V y s 8 i K n wmm 1 Vv hH IP V I lingiis l MODEL DG SELECTIVE STATIC TRIP DEVICE 205419 205420 MODEL D 0 1 SELECTIVE STATIC TRIP DEVICE FIG 7 TRIP DEVICES TYPICAL STATIC OVERCURRENT 2 24 67 DATE Courtesy o...

Page 31: ...he LA 600 circuit breaker there are five groups of transformers as shown in Table A f TABLE 4 CURRENT TRANSFORMERS AVAILABLE CONTINUOUS CURRENT RATINGS AND KNOB POSITIONS TRANSFORMER GROUP NO I I E C A D B i 6o 80 40 I I 70 50 11 I 10 130 150 75 95 250 III 125 155 175 220 350 400 IV 250 200 300 600 450 525 V 300 375 I The LA 600 and other LA breakers have s i m i l a r groups of current transforme...

Page 32: ...05423 205424 SHAFT LOCKS AUIS CHMMERS v CAUTION LOOSEN SHAFT LOCKS BEFORE ROTATING KNOBS mmmil SlMMosu rrs f T M 5 M gggg uS YSl miiife w i S p CALIBRATION REFERENCE POINTS m 23 7 1 IP SKS x v v i 7 7 Vi sipppi v r Yv 205422 FIG 7B SHAFT LOCKS AND CALIBRATION MARKS FOR STATIC OVERCURRENT TRIP DEVICES Courtesy of NationalSwitchgear com ...

Page 33: ...AALUS CHALMERS 9 205251 PORTABLE TEST SET FOR STATIC OVERCURRENT TRIP DEVICES wm m i H 205243 TYPICAL TEST ARRANGEMENT FIG 7C 2 24 67 Courtesy of NationalSwitchgear com ...

Page 34: ...r V f 4 r m m Iffek f i itssaaBL laps la J4M H s A Cl i V v i A i V l r VJ ij i fi f v 205251 PORTABLE TEST SET FOR STATIC OVERCURRENT TRIP DEVICES 205243 V TYPICAL TEST ARRANGEMENT FIG 7C 2 24 67 Courtesy of NationalSwitchgear com ...

Page 35: ...yi m i i ft a i USM 1 XC I T v I s ir J ft I Pi i Tv Jt 1 3i 1 M ESBf TBS S 1 205251 PORTABLE TEST SET FOR STATIC OVERCURRENT TRIP DEVICES 205243 TYPICAL TEST ARRANGEMENT FI Go 7C 2 24 67 Courtesy of NationalSwitchgear com ...

Page 36: ... DELAY CURVES f ii Kij R 20 s 10 to 4 HP 1 Wri il fiSp iffilltil 11il pi IK 9 I 1 m HI Ri 1 pK 9 Vi I T r 5 111 4 4 I 3 3 MJX 3 I S3 i Uii ill Jv v i i 3 if 17 11 2 r r 1 JX i 2 i i tr IIP 4 ii i 1 fiir c r n ih I i r i Ill t I ul It I EH 1 III Si TAX IMUM SHORT TIME BAND H S o S MC 6 s i m t T d f V ii s 9 7 7 5 JU I J Wiitii X4 A A 4 2 9 INTERMEDIATE SHORT TIME BAND 2 2 INIMUM SHORT TIME BAND 1 ...

Page 37: ...i i hl illi ip 4 u r a i Ui J 1 T 1 mm nr mm 1 I500f500 r 4 1 r 1 4 ri 4J a ii _ y i H fhrp M b TT 01 i a f 03 4 01 m 07 h oe T iir 4 M T L rt u 0 I it Hi V 1 07 v4 ir I is i im 444 1 1 f i t i i i AL r r oe r 1 r J Sp b 05 in tr iT 03 Ui X _j 1331 4 4 T r 3 p ixA 4 4 l L binP eiis i fe J u TT ir4 01 ft n 04 T 4 f r r in i rt rJ 3 41 I in s i S 02 r J LT 4 4 r i v rn H 4 44 ib r e 03 A 4 fip 1 1 f...

Page 38: ...O 0 5 0 VARIABLE VOLTAGE TRANSFORMER 0 6 0 0 6 0 0 7 0 C 7 O TO TRIP COIL ON CIRCUIT BREAKER 0 8 0 0 8 0 MODEL AG AG I DG TERMINAL BLOCK DO NOT TEST ON TERMINAL 4 MODEL A 1 A 2 MODEL D D I TERMINAL BLOCK REFER PARAGRAPH 2 FOR DESCRIPTION OF TEST EQUIPMENT FIG 7F CO CTIOMS FOR FUNCTION TESTS MARCH 7J967 7MI8 555 402 V Courtesy of NationalSwitchgear com ...

Page 39: ... OPEN 800 806 807 CAUTION 802 SEALED UNIT DO NOT DISASSEMBLE 804 801 TRIP ROD 002 MAGNET 803 PLATE 804 COIL 805 BREAKER TRIP ARM 006 RESET CAM 807 RESET ARM 808 SPACER 809 NUT FSG 8 TYPICAL RELEASE MAGNET MAR 2 1967 72 240 068 401 Courtesy of NationalSwitchgear com ...

Page 40: ... Wf FIG il TYPICAL SECONDARY DISCONNECTS DEC 12 1966 71 2 4 0 5 8 4 4 0 1 The electrical attachments are wired to the terminals of a secondar assembly which is mounted on the left side of the breaker Two blc terminals each can be mounted on the breaker The secondary dlscor is accessible from the front of the breaker and aligns with a stati in the cubicle The stationary contact strips should be lub...

Page 41: ...ed breaker is equipped with a shunt trip attachment for tripping from a remote location Since the shunt trip coil is designed for a momentary duty cycle an a auxiliary contact switch is used to interrupt its circuit immediately after the breaker is tripped Energization of the coll causes the armature to pick up and rotate the trip arm counter clockwise to t r i p the breaker Extension spring 1303 ...

Page 42: ...edetermined value Either instantaneous or time delay operation can be supplied Adjusting screw 1408 should be set to provide an air gap of 25 between the solenoid pole head and armature with the device de energized as shown in the front view A 06 gap should be maintained between trip arm 1415 and trip bar I410 when the device is energized with the breaker closed as shown In Detail A Pick up and dr...

Page 43: ...ll alarm attachment functions to close or open an alarm circuit upon automatic overcurrent tripping of the breaker The relay coil is wired to terminals 7 and 8 of the static trip device This is a latching type relay and relay contacts 1502 are reset to the open position shown by actuating reset plunger 1506 Spacer washers 1504 are used to position the relay to ensure correct engagement of latching...