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CAUTION

1. Back view Back view AR220S AR212H AR220H Ly YY 20 Y 7 Horizontal terminals 4 Poles Front terminals 4 Poles Right side view Right side view 10 ol _ _ XW SIG 1 KG 8G oh LKQ YG Y___ SG WG re T 3 7 ZANY ANN r ee H a EAL AL Back view Back view include screw connection area AR208S AR212S AR216S 3 Poles Right side view 20 Horizontal terminals 3 Poles Right side view Front terminals Fig 5 Conductor KRB 5258 Back view e Vertical terminals 4 Poles Right side view Back view e Vertical terminals 3 Poles Right side view AULA Fig 6 Conductor include screw connection area AR325S AR332 S AR316H AR320H AR325H AR332H sj J o 2 p N R a 29 KA T ie g a 2s TE c 6S a 5 OZI i 2 5 5 o e Ee LL WW WCW S LIA AQ a i el A a c a9 z 5 5 2 as ao We 5 3 5 3 SASS 2 3 5 5 ANE 5 5 L 8 i u KRB 5258 100 150 al LLL LL Y XX IX SSE L QQy R I TN Q 0h A WG WW LUU KS 30 so 65 80 TypeAR2 300 250 150 150 WSS H Bo loo RJ NAE TEYE AMS RSS WWW GG 7 Short circuit current kA Dist L Back view ance mm Back view Table 2 Distance L D Cc J ken O o Q
2. TERASAK lTemPower INSTRUCTION MANUAL FOR AIR CIRCUIT BREAKERS With Draw out Cradle and Type AGR 11B Overcurrent Protective Device PERA TATT y EEE 7 Types AR208S AR212S AR216S AR220S AR325S AR332S AR440S AR212H AR216H AR220H AR316H AR320H AR325H AR332H k EE E A m ji a ie i k Notice Be sure to read this manual before installing operating servicing or inspecting the ACB Please retain this manual for future reference Electrical work must be done by competent persons ACB maintenance inspection parts replacement OCR field tests and setting changes must be performed by competent persons KRB 5258 TABLE OF CONTENTS 1 SAFETY NOTICES 2 RECEIVING AND HANDLING 2 1 Transportation Precautions 2 1 1 Transporting the ACB 2 1 2 Transporting the breaker body 2 1 3 Transporting the draw out cradle 2 2 Storage Precautions 2 3 Installation Precautions 3 GENERAL 3 1 Types and Descriptions 3 2 Parts and Functions 3 3 Circuits and Ratings 4 OPERATION 4 1 Charging and Opening operation 4 1 1 Charging operation 4 1 2 Closing operation 4 1 3 Opening operation 4 1 4 Motion of trip indication and spring charge indication switches 4 1 5 Motion of operation mechanisms 4 2 Draw out and Insertion Operation 4 2 1 General 4 2 2 Draw out operation 4 2 3 Putting the breaker body back into the draw out cradle 4 2 4 Contact status of auxiliary and position
3. 1 7 N m Fig 10 Terminal block tilted down If any work is done near the ACB that have been installed protect the openings of the ACB with appropriate covers to prevent spatters metal chips wire cuttings or other foreign objects from entering the ACB 13 KRB 5258 3 GENERAL 3 1 Types and Descriptions TemPower2 is available in types shown in Tables 3 and 4 Table 3 Standard types 1250 1600 2000 2500 3200 4000 AR208S AR212S AR216S AR220S AR325S AR332S AR440S Max rated current h A 1 2 800 1250 1600 2000 2500 3200 Number of poles 3 4 Dielectric withstand voltage U S0 60Hz 5 Operating voltage Us 50 60Hz 6 s9 eo eo e09 leo so eo Rated breaking making current kA sym rms kA peak z 50 105 PARS EEN 65 143 10 AC 550V 50 105 65 143 75 165 JIS AC 460V AC 220V 65 143 85 195 5 100 230 NK 7 AC 690V 50 115 65 153 75 179 AC 450V 65 153 10 85 201 10 100 245 TOAN Rated short time current iew KA rms 1 sec Rated latching current kA aaa Endurance nnumber or ON Without AC 460V 12000 12000 12000 10000 7000 7000 3000 OFF cycles 11 Electrical mainte nance AC 690V 10000 10000 10000 7000 5000 5000 2500 Draw out or fixed type _ ___ SS S S O O O O Installation Draw out or fixed type Mass kg for draw out type 73 ses 73 a s ze J o 79 94 io5 125 105 125 139 176 External dimensions mm _ _ SS o o o OE External dimensions mm a faeo 445 360
4. Fig 69 Remedial actions against an overheat KRB 5258 60 8 DOOR INTERLOCK Function of the Door Interlock General The door interlock prevents the switchboard panel from being opened when the ACB is closed or in the CONNECT or TEST POSITION The panel door is only operable when the ACB is OPEN and ISOLATED thus preventing remote operation of the ACB Normal Function e When the ACB is CLOSED and in the connected position the draw out handle cannot be inserted e When the ACB is OPEN it can be drawn out to the test or isolated position This is indicated on the ACB s position indicator e To open the panel door the ACB is required to be OPEN and in the isolated position Areas of Caution e _ Ensure the panel door is fully closed and locked before attempting to draw out or rack in the ACB from any of thee three positions CONNECTED TEST amp ISOLATED to another e When moving the ACB body care should be taken not to damage the door interlock pin situated at the bottom left and protruding from the ACB Interlock Release e The door interlock can be defeated by releasing the spring actuated catch on the interlock panel unit This is accessible through a hole located between the interlock panel unit fasteners Door Interlock Adjustment How to adjust the panel unit Once the ACB is installed into the switchboard and the panel door unit is fitted check the position of the handle shutter when the door i
5. 25 Handle operating torque When the main contact starts engaging the force required to turn the handle will increase as shown in Fig 25 This symptom does not mean a malfunction Continue to turn the handle Rotating the handle more 13 or 14 turns moves the breaker body to the CONN position where the handle cannot be turned with its max operating torque 5 Remove the draw out handle 6 Tighten the breaker fixing bolts Fig 23 Q if used to lock the breaker body KRB 5258 30 4 2 4 Contact status of auxiliary and position switches Tables 17 and 18 show the contact status of auxiliary switches and position switches respectively Table 17 Contact statues of auxiliary switches ACB state Status of Status of sete iti body position CONN 7 eeee eCUPTC E O N S OEO OSO ee OF i ON S m ON p n OFF ON ca SSS S yY OFF ON Table 18 Contact statues of position switches Position indication Status of Status of CONN position indication p a TEST position indication ISOLATED position indication a Inserted position indication pmj Inserted means that the breaker body is in the CONN TEST or ISOLATED position 4 3 ON OFF Button Cover Locking Procedure Lock the button cover using a padlock with 6 shackle up to 3 padlocks can be used as shown in Fig 26 The ON OFF button cover is locked and the ON and OFF buttons cannot be operated ON OFF button cover Daai 4 f N OFF button cover OFF
6. DANGER Never stand under the ACB that has been lifted or suspended by a lifter or lifting attachments If the ACB body is accidentally dropped its weight may cause serious injury 2 1 1 Transporting the ACB Before transporting the ACB make sure the breaker body is in the CONN position If the ACB has breaker fixing bolts make sure the breaker body is secured to the draw out cradle with the fixing bolts When lifting the ACB hold it using lifting attachments or wire ropes through the lifting holes Take care that the position switches control circuit terminals auxiliary switches arc gas barrier and control terminal block cover which are shown in Fig 1 are not damaged by the lifting rope Lift the ACB carefully and gently For transportation place the ACB on a pallet and carry slowly and carefully Avoid shock and vibration to the ACB during transportation Do not lay the ACB during transportation When transporting the ACB over great distances crate it for protection against shock and vibration and secure the crate package with wood or ropes When transporting the ACB while it is installed in a switchboard you should fix the breaker body in the draw out cradle with the breaker fixing bolts optional Lower the ACB onto a flat level surface Position switches Control circuit terminals Auxiliary switches al a Miram L Control terminal block cover Lifting attachment Lifting hole 20mm Breaker body Arc g
7. a co D Le Conductor SES lt i EE Fig 7 Conductor include screw connection area AR440S Vertical terminals 3 Poles Right side view Vertical terminals 4 Poles Right side view 8 Use a support to hold conductors securely at distance L as shown in Fig 8 and Table 2 Such a support will help preventing the conductors and main circuit terminals from being deformed or damaged due to a large electromagnetic force caused by any fault current 12 KRB 5258 The following procedure makes it easy to make connections with plug in tab terminals 187 of position switches control circuit terminals and auxiliary switches 1 Draw out the breaker body to the removed position and remove it using an optional lifter or lifting plate Refer to sections 4 2 2 and 2 1 2 2 Ifthe ACB is equipped with the control terminal block cover loosen both the cover fixing screws and remove the cover 3 Remove the terminal block fixing screws shown in Fig 9 Terminal block fixing screws Hex head M6 x 10 4 red with spring washer and flat washer Tightening torque 4 7 5 9 N m 4 Tilt the terminal block down as shown in Fig 10 After connecting wires tilt the terminal block up again and fix it with the terminal block fixing screws Auxiliary switch terminal screw Control terminal screw Position switch terminal screw Pan head M4 x 8 with spring washer and terminal washer Tightening torque 1 3
8. MHT to trip open the ACB A plastic cover of the breaker body front panel Indicates the type applicable standards and rated breaking capacity of the ACB Indicates the number of poles operation method accessories and serial number of the ACB Allows breaker body G to be moved on draw out rail Closes when the breaker body is in the CONN position Closes when the breaker body is in the CONN or TEST position Extinguishes the arc that occurs in the breaking operation Converts the current in the main circuit into a voltage signal in proportion to the magnitude of the current and sends the signal to overcurrent release A plastic cover of the breaker body side face A plastic cover of the breaker body rear face Allows the breaker body to be locked in the CONN position even if the ACB is subject to strong vibrations Use to draw out the breaker body from the draw out cradle Refer to chapter 1 Operation Precautions Refer to chapter 1 Operation Precautions Prevents the breaker body from falling when the body is drawn out from the draw out cradle Refer to chapter 1 Operation Precautions Allows the draw out rail to be locked in the drawn out or retracted state Indicate the present breaker body position CONN TEST ISOLATED or INSERTED The position switches are available in 2C or 4C configuration Connections to the position switches are made through M4 screws 18 Control cir
9. OFF cycle counter flipped to the upper right direction ON OFF cycle counter fixing screw Pan head M5 x 10 with spring and flat washers Tightening torque 2 7 3 5 N m Fig 55 Flipping the ON OFF cycle counter 4 OCR mounting screw Pan head M5 x 10 2 with spring and flat washers Tightening torque 2 7 3 5 N m Wire tie Wiring OCR mounting screw KRB 5258 92 6 Pull out the OCR as shown in Fig 57 and place it on the floor Hand connector red with two terminals Hand connector white with three terminals Hand connector white with six terminals Hand connector white with two terminals SS a i a Ni t z Fig 57 Removing hand connectors 7 Unscrew the contact block mounting screws as shown in Fig 37 and flip the contact clock up as shown in Fig 38 8 Unscrew relay base mounting screws A and B raise the relay base to unlatch from other parts remove the base and place it on the top of the breaker body See Fig 58 When relay base mounting screw A the relay base ground terminal will also be removed Relay base mounting screw A Pan head M5 x 10 with spring and flat washers Tightening torque 2 7 3 5 N m Relay base mounting screw A Relay base mounting screw B Hex head M5 x 10 with spring and flat washers Tightening torque 2 7 3 5 N m Fig 58 Relay base and related parts 53 KRB 5258 9 Remove the relay retainer shown in Fig 59 and remove
10. and stationary 4 Resistance ie contacts If it is useless to replace contacts contact us After inspection open ACB and discharge closing springs Current sensors 5 Looseness of Check current sensor mounting screws for looseness If loose retighten See 6 2 3 screws g i i g Disconnect hand connector green and using tester measure coil resistance between terminals and make sure it is within range specified in Table 10 If not so replace LRC Lengih and Remove LRC and using vernier caliper make sure plunger length is 24 2 24 8 mm in natural state o and protrusion of plunger is 6 3 7 mm when moving core is pushed in If not so replace LRC ine Hand Check that hand connector green is connected to ACB hand connector green correctly If See 6 2 5 connector incorrect connect correctly Ee Check LRC mounting screws for looseness If loose retighten With closing springs charged check that pushing moving core results in ACB being closed slowly and releasing moving core results in the core being restored smoothly If not so replace LRC If it is useless to replace LRC contact us After inspection open ACB and discharge closing springs Disconnect hand connector black and using tester measure coil resistance between terminals 11 Coil resistance Ce S a and make sure it is within range specified in Table 11 If not so replace SHT 12 m Remove SHT and using vernier caliper make sure plunger leng
11. control wire for the auxiliary or pinch the wire between the auxiliary and the breaker body Doing so may cause a malfunction To ensure safety be sure to perform the preparation work described in section 6 2 1 unless otherwise specified in the inspection procedures The normal inspection procedure and the detailed inspection procedure are shown in Tables 24 and 25 respectively Information you are requested to state If you want us to take action against an abnormality contact us while providing us the information shown in Table 2 3 below Our contact is shown at the end of this manual Table 23 Information you are requested to state AR poles with draw out cradle PE ee Serial No Main circuit rated current a o AC 7 DC Produci ee Rated voltage ssid Soacharninomehga o ino morne SO charging o Motor charging E SNe irn section on pring ging Rated operation voltage 0 ACo DC specification nameplate o Non o Equipped Type AGR 11 OCR section on Rated control control voltage oO ae o DC specification nameplate Esciiealanpsine davies o Shunt trip device SHT Rated voltage o0 ACo DC TRIPPING section on pping O oo Se UVT Rated voltage o AC o We specification nameplate Special specification ee eee t s Cs on i i deaeeabicebcaese __ nameplate Working conditions Voltage current environment Symptom of abnormality in detail When How Where etc Inspection done actions taken if any Stat
12. even in those current ranges in which the long time delay trip time setting is OCR rated Dinan cinean eT a shorter than the short time delay time setting N phase protection trip and ground fault trip Fig 34 Characteristic curves of type AGR 11BL OCR with L characteristic KRB 5258 36 5 3 OCR Setting Procedure A CAUTION OCR setting changes must be performed by competent persons Use a small flatblade screwdriver with a torque of not more than 0 1 N m or a force of not more than 0 1 N when adjusting the setting switches rotary step switches or slide switches An excessive torque or force may cause a malfunction The following describes how to set the OCR 1 Open the ACB 2 Push the right end of the OCR cover to the left at the hollow on the front cover to unlatch and open the OCR cover See Fig 31 If the OCR cover is padlocked first remove the padlock OCR cover Fig 31 OCR cover 3 Use rotary step switches and slide switches to set the OCR See Fig 32 Rotary step switches must be adjusted with a small flatblade screwdriver Turn switch knobs stepwise and do not stop the knobs halfway between calibration markings A bold line on a switch dial means the same settings Slide switches must also be adjusted with a small flatblade screwdriver Do not stop switch knobs halfway Rotary switch knob Ir 10 Dial tT as FF 0 8 WM Al Twn Xh Slide
13. front cover mounting screws The cover mounting screws are of captive type and cannot be removed from the side and front covers Location of cover mounting screws AR2 series ACB T a AR3 4 series with 3 poles a r Front cover a Cover mounting screw captive Pan head M5 x 20 4 8 with spring and flat washers Tightening torque 2 7 3 5 N m Py Fig 36 Cover mounting screws 43 KRB 5258 2 Remove the contact block fixing screws as shown in Fig 37 Contact block fixing screw Pan head M5 x 10 2 with spring and flat washers Tightening torque 2 7 3 5 N m 4 Turn the UVT mounting screws eight or ten turns to loosen disconnect the manual connector red and then remove the UVT as shown in Fig 39 UVT mounting screw re hy JS Pan head M4 x 60 2 Hand connector HE E with spring washer sag Tightening torque 1 3 1 7 N m a N Fig 39 Removing the UVT KRB 5258 44 5 Flip the contact block down and slide the front cover to the original position as shown in Fig 40 m Front cover Contact block vi 1 TF Fig 40 Sliding the front cover to the original position 6 Perform manual closing opening operation of the ACB Refer to sections 4 1 2 and 4 1 3 7 Reinstall each part or component in reverse order of removal after inspection When installing the UVT make sure the nameplate on the UVT can be viewed from the front of the ACB Fig 41 provides t
14. open the ACB Push to close the ACB Shows OFF when the ACB is open and ON when it is closed Shows CHARGED when the closing springs are charged and DISCHARGED when it is released Pump to charge the closing springs Indicates the present breaker body position CONN TEST or ISOLATED Hold to draw out the breaker body Insert the draw out handle into this hole to move the breaker body Push to move the breaker body from the TEST position Accommodates up to three padlocks to lock the breaker body in the CONN TEST or ISOLATED position Padlocks are not supplied Use padlocks with a 6 mm diameter shackle Padlocking this plate allows the ACB to be locked in the open OFF state Padlocks are not supplied Use padlocks with a 6 mm diameter shackle Provides protection against inadvertent button operation and can be padlocked Padlocks are not supplied Use padlocks with a 6 mm diameter shackle Up to three padlocks can be installed Reads the number of ON OFF cycles It counts a series of operations from close to open as one cycle Padlocking this plate prevents settings of overcurrent release 48 to be inadvertently changed Padlocks are not supplied Use padlocks with a 6 mm diameter shackle This protective device is supplied power via the power CT installed in the ACB main circuit When the current sensor detects an overcurrent in the main circuit the OCR instructs the magnet hold trigger
15. pero o o 1530 200 220 2830 Bw 7309201220 10 190 210 2690 Conductor size Standard Ambient 2 x 80 x 5t 2 x 100 x 5t 3 x 100 x 5t 2 x 100 x 5t 3 x 100 x 5t 2 x 100 x 10t 3 x 100 x 10t temperature C e R e fod rs iso mo ioo 2o 2400 250 ype feo f ro mo i isso teso 250 22 JIS 8372 fod iso io 1o 1o too 2230 10 45 1250 50 1250 55 1250 1230 Notes For AR208S AR212S and AR2168 it is assumed that main circuit terminals are of horizontal type at both the line and load sides Forother types it is assumed that main circuit terminals are of vertical type at both the line and load sides The above values may vary depending on the switchboard configuration 40 standard ambient temperature 1250 1500 1740 1600 2000 2370 2610 JEC 160 KRB 5258 16 3 2 Parts and Functions Fig 11 provides a general views of the ACB ON OFF indicator Front cover l terrere Sarnen ay Iad A s an Charge indicator OFF button Pa G ON button ON OFF button cover ON OFF button cover s Rating nameplate Lock in OFF plate Position indicator Position padlock lever e Release button _ a Position switches 97 Control terminal block cover Control circuit terminal 38 Lifting hole 620mm Cover fixing screw Control circuit contact Auxiliary switches Terminal block Main circuit contact A Breaker fixing bolt re
16. ranges to the motor Otherwise a malfunction burnout or fire may result 9 KRB 5258 Repeated open close operation by the motor charging mechanism without pause should not exceed 15 times If repeated continuous open close operation is inevitable a pause of at least 20 minutes should be provided after the repetitions of 15 times Otherwise a spring charging motor may be burnt out Do not bring your hand or face close to arc gas vent of the arc chamber while the ACB is closed Otherwise a burn may result from high temperature arc gas blowing out of the arc gas vent when the ACB trips open If the ACB trips open automatically remove the cause of tripping operation before re closing the ACB Otherwise a fire could result If the ACB has the breaker fixing bolts be sure to loose the fixing bolts before draw out operation Otherwise damage to the ACB may result Make sure the draw out cradle is secured with mounting screws before inserting or drawing out the breaker body Otherwise the insertion or draw out operation may cause the breaker body or the draw out cradle to fall resulting in damage to the ACB or personal injury When retracting the draw out rail into the draw out cradle be sure to push the rail end Do not hold the hook pin body stopper or body stopper shaft Doing so may cause your fingers to be pinched resulting in injury Do not forcedly turn the draw out handle clockwise when the breaker body is in the CONN po
17. short time delay and instantaneous current settings accordingly 2 The ground fault trip pickup current setting should not exceed 1200A 35 KRB 5258 lo i 3 o t 3 pE 5 a oj AE 2 Rojo Cul xiz lt z 4 4 40 40 tO 20 i 20 o x 2 x E E 6 6 4 4 2 4 2 1 S O 40 Ca 40 N aX prr D 19 N 6 A Q Q 6 6 5 D og j Q 4 le O 2 N 2 z x 1 8 1 z 0 5 KS oO a 06 os Vie 0 4 sz aan x SON on s 7 0 2 ACDA 0 2 0 1 A AR 0 1 re 0 06 0 04 E S 3 PRN XxX E x oe 0 02 ie 0 01 0 006 segge 2x3 2 22 2 22g2237 2 2 8 meee se amp A3 F BSRSSS 2 Generator rated current h X Short time delay trip instantaneous trip Generator rated current h xX Note 1 The operating time t at a long time delay or N phase protection trip pickup current setting AN oe N is given by 4 p R Long time delay or N phase f protection trip pickup current setting a t 27 94taln fi 1125 Leiso Ii tE T Note 2 The short time delay trip function has precedence over the long time delay trip function The OCR operates at the short time delay trip timing
18. switches 4 3 ON OFF Button Cover Locking Procedure 14 14 17 20 23 23 23 24 24 24 25 2 2 28 29 31 31 4 4 Lock in OFF Procedure 4 5 Position Lock Lever Locking Procedure 4 6 Breaker Fixing Bolt Securing Procedure 4 7 OCR Cover Locking Procedure 5 OVERCURRENT RELEASE OCR 5 1 Specifications 5 2 Characteristics 5 2 1 L characteristic for general feeder 5 3 OCR Setting Procedure 5 4 Operation Indication 6 MAINTENANCE INSPECTION AND PARTS REPLACEMENT 6 1 Inspection Procedures 6 2 Parts Replacement Procedure 6 2 1 Preparation 6 2 2 Arc chambers 6 2 3 Stationary contact 6 2 4 Moving contact 6 2 5 Latch release coil LRC 6 2 6 Shunt trip device SHT 6 2 7 Control relay 6 2 8 Magnet hold trigger MHT 6 2 9 Auxiliary switches 7 TROUBLESHOOTING FLOWCHARTS APPENDIX 8 DOOR INTERLOCK 9 MECHANICAL INTERLOCK 32 32 33 33 34 34 35 35 37 38 39 40 43 43 46 47 49 50 51 52 55 56 58 61 63 KRB 5258 1 SAFETY NOTICES Thank you for purchasing the TERASAKI AR series Air Circuit Breaker TemPower2 This chapter contains important safety information Be sure to carefully read these safety notices instruction in this manual and other documents accompanying the Air Circuit Breaker hereinafter referred to as the ACB to familiarize your self with safe and correct procedures
19. the control relay from the relay base Control relay Relay retainer Relay seat E S j Fig 59 Control relay and related parts 10 Reinstall each part or component in reverse order of removal after inspection Do not forget to install the OCR ground terminal and the relay base ground terminal KRB 5258 94 6 2 8 Magnet hold trigger MHT The following describes how to replace the magnet hold trigger MHT 1 Make preparations for parts replacement Refer to section 6 2 1 2 Remove the OCR and the relay base Refer to items 2 8 section 6 2 7 3 Unscrew the MHT mounting screws shown in Fig 60 disconnect the hand connector red and remove the MHT Hand connector red MHT mounting screw x g 4 WE MHT mounting screw i n Pan head M4 x 8 2 with spring and flat washers Tightening torque 1 3 1 7 N m 4 Reinstall each part or component in reverse order of removal after inspection Fig 61 provides the general view of the MHT Hand connector red Moving core To remove the moving core insert a small rod into the center hole on the skew and holding the rod lift the core Ea Fig 61 General view of MHT 99 KRB 5258 6 2 9 Auxiliary switches The following describes how to replace auxiliary switches 1 Make preparations for parts replacement Refer to section 6 2 1 1 and 2 2 If the ACB is equipped with the control terminal block cover loosen both the cover fixing s
20. the main circuit disconnect contacts At this moment a bang sound will be heard This sound does not mean a malfunction The ACB cannot be closed as long as the draw out handle is in the draw out handle insertion hole To close the ACB e g for ON OFF testing remove the draw out hanc ON OFF indicator Draw out handle insertion hole Draw out handle Position indicator G Release button Draw out rail Fig 23 Draw out and insertion operation KRB 5258 28 4 2 2 2 Moving the breaker body from the TEST position to the ISOLATED position 1 Open the ACB If the ACB remains closed the draw out handle Fig 23 Q cannot be inserted 2 Press the release button Fig 23 G The release button will be locked depressed 3 Unlock the position lock lever Fig 23 0 if locked See section 4 5 4 Insert the draw out handle into the draw out handle insertion hole Fig 23 and slowly turn counterclockwise until the position indicator Fig 23 G shows ISOLATED and a freewheeling sound is heard Turning the draw out handle will unlock the release button 5 Remove the draw out handle 4 2 2 3 Moving the breaker body from the ISOLATED position to the removed position 1 Make sure the draw out cradle Fig 23 is secured with mounting screws 2 Unlock the position lock lever Fig 23 if locked See section 4 5 3 Push the rail stoppers Fig 23 G outward on both sides of the draw out cradle to unlo
21. then remove the LRC See Fig 51 The LRC mounting screws are of captive type and cannot be removed from the LRC LRC mounting screw captive Pan head M4 x 80 2 with spring washer Tightening torque 1 3 1 7 N m Contact block Fig 51 Removing the LRC 7 Reinstall each part or component in reverse order of removal after inspection When installing the LRC make sure the nameplate on the LRC can be viewed from the front of the ACB Fig 52 provides the general view of the LRC LRC mounting screw Moving core located in the center hole Fig 52 General views of LRC KRB 5258 90 6 2 6 Shunt trip device SHT The following describes how to replace the shunt trip device SHT 1 Make preparations for parts replacement Refer to section 6 2 1 2 Turn the cover mounting screws five or six turns to loosen as shown in Fig 36 If the ACB is equipped with side covers first remove the side covers and then loosen the front cover mounting screws The cover mounting screws are of captive type and cannot be removed from the side and front covers 3 Pulling the charging handle down remove the front cover 4 Remove the contact block fixing screws as shown in Fig 37 5 Flip the contact block up as shown in Fig 38 6 Turn the SHT mounting screws eight or ten turns to loosen disconnect the manual connector black and then remove the SHT See Fig 53 The SHT mounting screws are of captive type and cannot b
22. to chapter 6 Maintenance Inspection and Parts Replacement 12 For both vertical and horizontal terminals 13 This manual covers draw out type ACBs KRB 5258 ae Table 4 High performance types 1250 1600 2000 1600 2000 2500 3200 AR212H AR216H AR220H AR316H AR320H AR325H AR332H Max rated current h A 1 2 1250 1600 2000 1600 2000 2500 3200 Dielectric withstand voltage U 50 60Hz 5 Operating voltage Us 50 60Hz 6 s99 eo eo e9 leo seo leo Rated breaking making current kA sym rms kA peak 7 35 187 PENAS E 100 220 AC 550V 55 121 85 196 JIS AC 460V AG DBOV 80 176 100 230 nies AC 690V 55 128 85 201 AC 450V 80 186 100 233 DC 600V 10 Besa Rated short time current ow kA rms 1 sec e E a es 100 Rated latching current kA 85 Mechanical H7 Endurance in number of ON l Without ac 460V 12000 12000 10000 12000 10000 7000 7000 OFF cycles 11 Electrical mainte nance AC 690V 10000 10000 7000 10000 7000 5000 5000 Installation Draw out or fixed type Draw out or fixed type OSS S S S S S o O Mass kg for draw out type External dimensions mm External dimensions mm a 360 445 360 445 360 445 466 s5se 466 586 466 586 466 586 bo o S Mo Ee a y oda 354 439 354 439 354 439 460 580 460 s5ao 460 s5so 460 580 f A E a a a out type 13 o zeal ells d 40 Vertical terminals Horizontal terminals can be specified as an option Connect
23. undervoltage trip device UVT Rated voltage Opening voltage Attraction voltage Coil exciting Power consumption VA range V V current A uae ey 0 1 10 Holding coil 410 510 Attraction coil 5 6 6 8 Ambient temperature 20 C Table 13 Ratings of auxiliary and position switches Auwatary switches Position switches Voltage V For general feeder Resistive load A MOUStVE load A Resistive load A MOUCHYE joad A Resistive load A NAUCtVE joad A 0 1 0 1 D AC100 250 Po e e o a O a O AC251 500 DOO a E a S a G E a e DC8 a a ee eee eee eee ee 1 AC cos 0 3 DC L R lt 0 007 2 AC cos 0 6 DC L R lt 0 01 3 Min applicable load DC5V 1 mA Table 14 Ratings of operation indication contacts Rated contact current A Voltage V Spring charging tripping operation Resistive load A Inductive load A 1 Resistive load A Inductive load A 2 AC250 3 Oo a DC30 DC125 DC250 1 AC cos 0 3 DC L R lt 0 007 2 AC cos 0 6 DC L R lt 0 01 3 Min applicable load DC5V 1 mA Table 15 Ratings of N phase CT Ratings A AR2088 AR212S AR216S 200 5A 400 5A AR212H AR216H AR316H EP 1250 5A 1600 5A AR2208 AR325S AR332S AR440S EC160 40LS 1600 5A 2000 5A AR220H AR320H AR325H AR332H 3200 5A 4000 5A KRB 5258 22 4 OPERATION 4 1 Charging and Opening operation gt DANGER Never touch live terminal parts Otherwise electric shock
24. wipe off with dry clean cloth If surface is discolored badly polish it with 200 sandpaper For main circuit contacts apply contact grease SS grease No F Main control Surface 5G FUJI KAGAKU SANGYO to contact surface after cleaning circuit contacts condition Excessive grease may foster dust accumulation Grease should be applied lightly Blackening of contacts is caused by oxidation or sulfuration and has no harmful effect except in extreme cases If heat discoloration arc marks roughness or peeling of plating layer is found contact us Remove arc chamber and check it for foreign object or dust accumulation deformation cracks chips and other damage If foreign matter or dust is accumulated use vacuum cleaner to remove accumulation foreign matter of dust and wipe off with dry clean cloth If metal spatters are adhered use Damage sandpaper to remove them If arc chamber has stubborn adherents suffers damage replace arc chamber Remove arc chamber and check contact circumference contacts and contact tips for foreign object or dust accumulation deformation cracks chips and other damage If dust is accumulated use vacuum cleaner to remove dust and wipe off with dry clean cloth If contact tips are badly discolored Surface or roughened polish with 200 sandpaper If contact tip suffers damage or is less than 0 7 mm Contacts condition thick after polishing replace both moving and stationary contacts See 6 2 2 6 2 Black
25. work on the ACB open an upstream circuit breaker or the like to isolate all sources of power voltage Otherwise electric shock may result Fix the draw out cradle of the ACB firmly on a flat level surface using mounting screws Otherwise the draw out operation may cause the breaker body or the draw out cradle to fall resulting in damage to the ACB or personal injury Take care not to deform or bend protrusions in the bottom face of the draw out cradle when fixing the draw out cradle with mounting screws Deformation of the protrusions may cause a malfunction When terminating conductors to the ACB tighten terminal screws to the torque specified in this manual Otherwise a fire could result For 4 pole ACBs be sure to connect a 3 phase 4 wire neutral conductor to the N phase pole on the right end Otherwise an overcurrent may hinder the ACB from tripping resulting in a fire n Operation Precautions lt gt DANGER Never touch live terminal parts Doing so will result in electric shock Do not leave the ACB body in the draw out position If the ACB body is accidentally dropped its weight may cause serious injury CAUTION Do not force down the charging handle after completion of manual charging operation Doing so may cause a malfunction The permissible operating voltage of the spring charging motor is 85 to 110 of the rated ac voltage or 75 to 110 of the rated dc voltage Be sure to supply a voltage within the above
26. 2 Closing operation The ACB closing operation is not permitted unless all of the following conditions are met 1 The charge indicator Fig 17 Q shows CHARGED 2 The position indicator Fig 17 G shows CONN TEST or ISOLATED a halfway position not permitted 3 The draw out handle is not inserted in the draw out handle insertion hole Fig 17 G 4 The OFF button Fig 17 G is not locked with the lock in OFF plate Fig 17 5 The specified voltage is supplied to the undervoltage trip device Manual closing Open the ON OFF button cover Fig 17 and press the ON button Fig 17 The ACB will be closed with a sound The ON OFF indicator Fig 17 shows ON and the charge indicator Fig 17 Q shows DISCHARGED Electrical closing Press the ON switch shown in Fig 14 The latch release coil LRC Fig 14 will be excited and the ACB is closed with a sound The ON OFF indicator Fig 17 shows ON the charge indicator Fig 17 Q shows DISCHARGED and the charging motor starts charging the closing springs 4 1 3 Opening operation Manual opening Open the ON OFF button cover Fig 17 G and press the OFF button Fig 17 The ACB will trip open with a sound The ON OFF indicator Fig 17 shows OFF Electrical opening Press the OFF switch shown in Fig 14 The shunt trip device SHT or the fixed type undervoltage trip device Fig 14 will be excited so that the ACB trips open wi
27. 34 124 11 12113 16 17 18 114 214 314 414 514 614 714 814 914 014 Lower stage 152 142 132 122 21 23 26 27 28 112 212 312 412 512 612 712 812 912 012 When standard 4C optional 6C are used Upper stage 131 121 11121113111411 Middle stage 134 124 1142141314414 Lower stage 1321122 112 212 312 412 ee When standard 4C is used Fig 16 Terminal arrangement Tables 10 15 show the ratings of the operation power supply the shunt trip device SHT the undervoltage trip device UVT auxiliary switches position switches operation indication contacts and the N phase CT Table 10 Ratings of operation power supply Permissible Ratings of operation power supply nee itage charging closing Peak motor starting Steady state motor Peak making current E T voltage range current A current A A ohm Ambient temperature 20 C Table 11 Ratings of shunt trip device SHT Permissible voltage Peak exciting current Steady state current Coil resistance ohm Max contact parting Rated votage V ime ng 8 d AC100 70 110 280 350 AC110 T712 330 420 AC120 4 132 450 560 8 26 40 77 Ambient temperature 20 C 21 KRB 5258 Table 12 Ratings of
28. 445 360 445 seo 445 46e6e 586 466 5s6e b AO d y e 20 d y SS S a a ed e Y 7 He Ly aw E A a a a screw terminals Manual or motor charging No OCR or L characteristic for general feeder protection Group indication o col Standard equipment for OCR equipped ACB a Shunt trip device l Tripping device Optional undervoltage trip device UVT Optional si Number of switches 4C standard 7C or 10C available for general feeder or microload Auxiliary switches Terminal type screw terminals Rated voltage Operation power AC100 120V AC200 240V DC100 125V DC200 250V DC24V or DC48V 1 Ambient temperature 40 C 45 C for marine use 2 With horizontal terminals for AR208S 216S and vertical terminals for AR220S 440S 3 For 2 pole applications use two poles at both ends 4 4 pole ACBs are not applicable to power distribution IT systems unless N phase protection is provided 5 Varies depending on applicable standards AC1000V applies to ACBs conforming to IEC60947 2 and JIS C8201 2 6 Varies depending on applicable standards AC690V applies to ACBs conforming to IEC60947 2 and JIS C8201 2 7 Applicable to 3 pole ACBs 8 For applicability to power distribution IT systems consult us 9 Applicable under 3 pole serial connection scheme 10 For AC500V 11 Expected service life based on endurance test The service life of ACB depends on the working and environmental conditions Refer
29. CB is a fixed typed unlock the ACB After making sure the main circuit is not energised check the 10 operation of the ACB s Do not touch the interlock during operation 67 KRB 5258 E Inspection amp Maintenance e If the ACBs are draw out types remove the ACB bodies from their chassis If the ACBs are fixed ensure the ACBs are locked off e Check the wire fixing nut and cable fixing nut for tightness If loose retighten to the sp ecified torque e Make sure the distance between the support and the lever is as specified If the distance is out of the specified range readjust it e If the ACBs are of a draw out type insert the ACB bodies into the chassis to the connected positio n Do not turn the ACB s on until it is in the connected position If the ACB is a fixed type unlock the ACB e After making sure the main circuit is not energised check the operation of the ACB s Do not touch the interlock during operation Published in June 2002 Revised in November 2002 April 2003 March 2004 March 2006 The contents of this manual may be subject to change without notice Recycle paper used KRB 5258 68
30. D CONN BTN Control circuit contact Draw out cradle In this position the main circuit and the control circuits of the ACB are connected to the external circuits for normal service 2 TEST position Position indicator TEST RELEASE ISOLATED CONN BUTEN In this position the main circuit is isolated and the control circuits are connected The ACB can be tested with the switchboard panel door closed Insert 4 REMOVED position Position indicator TEST RELEASE ISOLATED CONN BUTTON Rollers Draw out rail The breaker body is removed from the draw out cradle 3 ISOLATED position Position indicator TEST RELEASE ISOLATED CONN N In this position both the main and control circuits are isolated and the ACB is completely de energized The switchboard panel door can be closed Fig 22 Positions of breaker body in draw out cradle Operation Durability The AR series ACBs are designed to ensure the operation durability of 100 draw out and insertion cycles in conformance to IEC 60947 1 one cycle means that the breaker body is drawn out from the CONN position to the Rem oved position and inserted back to the CONN position Draw out and insertion operation of more than 100 cycles could abrade the main circuit contacts resulting in an overheat of the contacts during energization 2 KRB 5258 4 2 2 Draw out operation gt DANGER Never touch live terminal parts Otherwise electric shock may
31. E Nearly no current Every 1000 cycles e Ambient temperature 45 C Normal very year level Every 500 cycles after 1000 cycles or higher Detailed Every half year after 2 Every 1000 Every 500 Every 100 Highly humid years since installation ee ee cycles cycles cycles Every 500 Every 250 Every 50 Number of open close cycles Go cycles after cycles after cycles after per day 4 or more 1000 cycles _ 500 cycles 100 cycles Always exposed to vibrations Every 2 or 3 years Ex Iron or chemical plants Every 2 years after 6 years Engine rooms without Thorough since installation ventilation Every year after 10 years Cogeneration installation since installation Ferryboats When abnormality is found during normal or through inspection Open close 1250AF 3200AF or bnormal Every 2500 3000 cycles Every 2000 cycles after 3000 cycles Open close operation due to Overcurrentlevel ee ca overload Thorough When abnormality occurs approx 6 times eles 5 Bae 5 a 5 Tripping due to shortcircuit the rated current When ACB is deemed to be repairable at through inspection Normal inspection includes inspection and actions that can be done only with removing the arc chamber contacts front cover and the like Normal inspection can be performed by the user Terasaki also provides normal inspection service Detailed inspection includes inspection actions and parts replacement that will be done to pre
32. NN TEST or ISOLATED position Yes Unlock Yes Deactivate NG Supply correct voltage NG Repair replace NG Repair No Contact Terasaki 59 Do operation indication contacts work well No contacts See Nos 8 and 9 in Table 24 and Nos 1 4 in Table 25 OK Check the operation mechanism See No 11 in Table 24 OK Is manual closing Possible Yes Check the operation voltage OK the control circuit and terminals See Nos 5 and 12 in Table OK Check LRC See Nos 6 10 in Table 25 OK Is electrical closing possible No Contact Terasaki Yes NG NG No NG NG NG Yes Check downstream circuits Repair replace Repair Contact Terasaki Supply correct voltage Repair Repair replace End KRB 5258 Are OCR settings An overheat occurs correct Correct adjust Is the ambient temperature Correct adjust as specified Check the control circuit See No 12 in Table 24 Check the tripping operation See No 29 Contact Terasaki in Table 25 Is the load current as specified Are main circuit contacts See Nos terminal screws loose See Retighten 8 and 9 in Table 24 and Nos Repair replace No 5 in Table 24 2 4 in Table 25 Check main circuit contacts See No 6 in Repair replace Table 24 Is the problem solved Contact Terasaki
33. and min SHT 27 ne Bee l l operation voltages within permissible closing voltage range to make sure ACB trips open normally See Table 11 If ACB does not trip open contact us With breaker body assembled to original state move breaker body to TEST position charge closing UVT 28 Electrical springs and make sure that ACB closes when UVT is supplied with attraction power And decrease operation UVT supply voltage to make sure ACB opening voltage is within specified opening voltage range See Table 12 If ACB does not operate normally contact us OCR and MHT Operation With breaker body assembled to original state check OCR and MHT with type ANU 1 OCR checker optional to make sure ACB operates normally If ACB does not operate normally contact us KRB 5258 42 6 2 Parts Replacement Procedure A CAUTION ACB maintenance inspection and parts replacement must be performed by competent persons Do not touch ACB current carrying parts and ACB structural parts close to a current carrying part immediately after the ACB trips open Remaining heat may cause a burn Prior to commencing any work on the ACB open an upstream circuit breaker or the like to isolate all sources of power voltage from the main and control circuits Otherwise electric shock may result Take care to avoid adhesion of dust to main and control circuit contacts Dust on the contacts may result in a fire Prior to commencing maintenance inspection or parts repla
34. and trip linkage rotates counterclockwise Parts marked with an asterisk are trip pins To avoid superposition in the figure magnet hold trigger oO aa related parts are drawn in positions that are different ee from actual positions This rotates trip trigger shaft G counterclockwise and trip lever B disengages from a X semicircular pawl and rotates counterclockwise And i A i l trip lever AO rotates counterclockwise trip link a HI toy moves to a lower right direction and closing toggle cam Wh E rotates clockwise The force of closing spring and contact spring rotates crossbar counterclockwise so that moving contact is parted from stationary contact At this time each component is positioned as shown in Fig 19 d h a S a Pi EEEN Fig 21 Opening motion KRB 5258 26 4 2 Draw out and Insertion Operation 4 2 1 General The draw out type ACB consists of the breaker body and the draw out cradle The main and control circuit terminals are installed on the draw out cradle which permits you to draw out and inspect or service the breaker body without the need for removing wiring from the terminals The draw out mechanism allows you to move the breaker body to any of the four positions as shown in Fig 22 The switchboard panel door can be shut with the breaker body drawn out to the CONN TEST or ISOLATED position 1 CONN position Position indicator TEST RELEASE ISOLATE
35. as barrier Draw out cradle Breaker fixing bolt Front view Rear view Fig 1 Transporting the ACB 7 KRB 5258 2 1 2 Transporting the breaker body Use an optional lifter or lifting plate to transfer the breaker body When transporting the breaker body on a lifter move the lifter with the lifter fork held at the lowest possible position Take care not to exert forces on the front cover and the control circuit contacts shown in Fig 2 Otherwise a deformation or damage may result Lifting plate an ee Control circuit contact Front view Rear view Fig 2 Transporting the breaker body 2 1 3 Transporting the draw out cradle When transporting the draw out cradle hold it using lifting attachments or wire ropes through the lifting holes or carry it by the portions 4 points marked with the arrows shown in Fig 3 When carrying the draw out cradle take care not to exert forces on the arc gas barrier the draw out arm the position switches the auxiliary switches the control circuit terminals the control terminal block cover and the control circuit contacts Position switches Control circuit terminals Auxiliary switches z rr ee e h Lew Control terminal block cover Lifting attachment Lifting hole 20mm Control circuit contacts h TU i Ps Arc gas barrier Draw out arm dl Front view N Rear view dh Fig 3 Transporting the draw out cradle 2 2 Storage Precautions It is recommended that th
36. bles e When installing the interlock cables first perform the priority 1 connections and then priorty 2 in cable connections chart above Then follow the steps 1 to 10 Cale fring n Cakle mounting hole Interlock Parts KRB 5258 66 Attach the cable in the cable mounting Loosen the cable fixing nut 1 Hole and insert the wire into the wire and the wire fixing nut Insertion hole of the wire fixing bolt Cable fixing nut Cable i Sleeve l Wire Temporarily tighten the cable fixing nut Push in and hold the wire until It stops against the groove end Holding the wire tighten the A Wire fixing nut to a torque of 4 7 to 5 9 N m Unit mm Cable mounting hole 385205 Repeat steps 1 to 5 for the wire on the other end of the cable Make sure the distance between the support and the lever is as specfied and then tighten the cable fixing nut to a torque of 12 5N m If the distance is out of the specfied range proceed to step 8 to adjust the distance If the distance is too small turn the cable fixing nut counter clockwise to lower the sleeve and the lever increasing the distance until it falls within the specified range If the distance is too large turn the cable fixing nut clockwise to raise the sleeve If the ACBs are of a draw out type insert the ACB bodies into the chassis to the connected position Do not turn the ACB s on until it is in the connected position If the A
37. button e t ON button ON OFF button cover locking hole Fig 26 Locking the ON OFF button cover 31 KRB 5258 4 4 Lock in OFF Procedure 1 Open the OFF button cover shown in Fig 27 2 Raise the OFF lock tab and close the button cover 3 Lock the button cover using a padlock with 66 shackle up to 3 padlocks can be used as shown in Fig 27 The OFF button is locked depressed which disables the ON button Button cover locking OFF button kde OFF button cover Fig 27 Locking the OFF button 4 5 Position Lock Lever Locking Procedure 1 Move the breaker body to the desired position CONN TEST or ISOLATED 2 Pull out the position lock lever shown in Fig 28 3 Lock the position padlock lever using a padlock with 6 shackle up to 3 padlocks can be used as shown in Fig 28 This prevents the draw out handle from being inserted into the draw out handle insertion hole i e the breaker position cannot be changed Tee Position padlock hole Position padlock lever Fig 28 Locking the position padlock lever KRB 5258 32 4 6 Breaker Fixing Bolt Securing Procedure 1 Move the breaker body to the CONN position 2 Loosen the breaker fixing bolt shown in Fig 29 move the spring and flat washers close to the bolt head and push the bolt into the U notch of the grip 3 Tighten the breaker fixing bolt using the draw out handle This procedure is required for both the sides of the ACB Breaker fixing b
38. cement make sure that the closing springs are released and the ACB is open Otherwise unintentional open close operation may lead to fingers or tools to be pinched by the open close mechanism resulting in injury Be sure to reinstall the arc chamber if removed Failure to do so or incorrect installation of the arc chamber may result in a fire or burn When replacing an auxiliary do not damage the control wire for the auxiliary or pinch the wire between the auxiliary and the breaker body Doing so may cause a malfunction 6 2 1 Preparation Be sure to make the following preparations for parts replacement in order to ensure safety 1 Open an upstream circuit breaker or the like to isolate all sources of power voltage from the main and control circuits 2 Draw out the breaker body to the removed position and remove it using an optional lift er or lifting plate Refer to sections 4 2 2 and 2 1 2 3 Discharge the closing springs and open the ACB The procedure varies depending on whether or not the ACB is equipped with the undervoltage trip device UVT When the ACB is not equipped with the undervoltage trip device UVT Perform manual closing opening operation of the ACB Refer to sections 4 1 2 and 4 1 3 When the ACB is equipped with the undervoltage trip device UVT 1 Turn the cover mounting screws five or six turns to loosen as shown in Fig 36 If the ACB is equipped with side covers first remove the side covers and then loosen the
39. cient insertion of the wire could result in damage to the interlock E Operation amp Maintenance e Do not touch the interlock during operation Doing so may result in personal injury e Maintenance and or inspection of the interlock system must only be carried out by qualified and authorised personnel e Before commencing maintenance work remove the ACB bodies from the chassis or lock off the ACBs Failure to do so may result in damage to the interlock or personal injury e If the ACBs are draw out types ensure the ACBs are off while racking them into the chassis Failure to do this can result in damage to the interlock KRB 5258 64 j Types amp Operations TYPE C TYPE B TYPE D TYPE A on o 7 orton 7 ore orF Z ON ON OFF ON OFF ON ON OFF OFF ron OFF OFF ON OFF ON ON OFF OFF Remark One of two breakers can be turned on One of three breakers can be tumed on Br is interlocked with both Gril and Br3 e The interlock is enabled in the connected position When the ACB is in the TEST ISOLATED or DRAW OUT position the interlock is disabled e If all the ACBs in the interlock system are open and receive a close on signal none will turn on However if this occurs there will be momentary continuity between the main circuit and the auxiliary switch A contact in all the ACBs e The body of the other ACB s as long as they are off open can be draw
40. ck the draw out rail Fig 23 and then uphold and pull out the rail until it stops The draw out rail will be locked again by the stoppers The breaker body cannot be drawn out unless the rail is locked 4 Holding both the grips Fig 23 draw out the breaker body until it stops If the ACB is equipped with an optional auto discharging device Fig 23 the closing springs of the ACB will be automatically discharged with a mechanical sound This sound does not mean a malfunction Do not leave the ACB body on the draw out rail pulled out 5 Use an optional lifter or lifting plate to transfer the breaker body Fig 23 Q toa safe place Refer to section 2 1 2 4 2 3 Putting the breaker body back into the draw out cradle gt DANGER Never touch live terminal parts Otherwise electric shock may result Do not leave the ACB body in the removed position The weight of the ACB may cause serious injury A CAUTION Make sure the draw out cradle is secured with mounting screws before inserting the breaker body into the draw out cradle Otherwise the insertion operation may cause the breaker body or the draw out cradle to fall resulting in damage to the ACB or personal injury When retracting the draw out rail into the draw out cradle be sure to push the rail end Do not hold the hook pin body stopper or body stopper shaft Doing so may cause your fingers to be pinched resulting in injury Do not forcedly turn th
41. cles of open close operation and then retighten the contact mounting screws to the specified torque Fig 48 shows the contacts in closed and open state Opening distance measuring points Resistance measuring points Open state Closed state Fig 48 State of contacts KRB 5258 48 6 2 4 Moving contact The following describes how to replace the moving contact 1 Make preparations for parts replacement Refer to section 6 2 1 2 Remove the arc chambers and stationary contact Refer to sections 6 2 2 and 6 2 3 3 Insert an Allen wrench of a nominal diameter of 5 into each of the Allen wrench holes shown in Fig 46 turn each moving contact mounting screw two or three turns to loosen and raise and remove the upper separator shown in Fig 49 a Mana RNAS Mi 1 Upper separator Moving contact tip Moving contact oe ss k T ee Bae Moving contact mounting screw te F Hex socket head M8 x 30 6 8 Insulated operating rod ee E ee oe with spring and flat washers oS Tightening torque 14 7 N m Wee Spacer B for AR208S Spacer Lower separator Fig 49 Moving contact 4 Supporting the spacers the number of which varies depending on the poles the moving contact the lower separator and the moving contact mounting screws by hand turn the moving contact mounting screws additional two or three turns to remove these parts Fig 50 shows the moving contact related parts Lower separator Movin
42. crews and remove the cover 3 Remove the auxiliary switch mounting screws shown in Fig 62 Auxiliary switches 7 _ Cover fixing screw Auxiliary switch mounting screw Pan head M4 x 10 4 6 with spring and flat washers Tightening torque 1 3 1 7 N m Fig 62 Auxiliary switches and related parts 4 Depressing the AUX lock lever shown in Fig 63 raise the operation lever Operation lever amp b AUX lock lever Fig 63 AUX lock lever and operation lever KRB 5258 96 5 With the operation lever raised uplift the auxiliary switch unit pull the shaft lever through the U notch and remove the auxiliary switch unit See Fig 64 Auxiliary switches i 7 Operation lever Shaft lever Fig 64 Removing the auxiliary switches 6 Reinstall each part or component in reverse order of removal after inspection When installing the auxiliary switch unit apply molybdenum grease to the engagement of the operation lever and the shaft lever Auxiliary contacts can be checked visually through the inspection holes sho wn in Fig 65 Auxiliary contact _ 7 Inspection holes Shaft lever Fig 65 Checking auxiliary contacts 97 KRB 5258 7 TROUBLESHOOTING FLOWCHARTS Figs 66 69 are troubleshooting flowcharts where typical troubles and remedial actions are shown Closing springs Contact Terasaki cannot be charged Check the charging mechanism See No 11 in Table 24 Is
43. cuit terminals Control terminal block cover optional Cover fixing screw Auxiliary switches optional Terminal block Ground terminal M8 tapped hole Gas exhaust port Arc gas barrier Breaker draw out arm Main circuit terminals Vertical terminals Lifting hole 20mm Protrusion Draw out handle removable Allow connections of external control wire to the control circuits Wire connections are made through M4 screw terminals Fig 12 shows the control circuit terminals TETEL TL cee ee Seduced Joo at Eiri a RG Re ea i aoe ee k i Fig 12 Control circuit terminals Protects the position switches the control circuit terminals and the auxiliary switches from damage Secures the control terminal block cover Indicate the state of the ACB ON or OFF The auxiliary switches are available in 4C configuration standard or 7C or 10C configuration optional Connections to the switches are made through M4 screw terminals Contains position switches amp amp control circuit terminals 7 and auxiliary switches s Allows connection of a ground terminal Allows the arc gas to be discharged from arc chamber in a horizontal direction when the ACB trips open Prevents the arc gas from being discharged upwards from arc chamber when the ACB trips open Is retracted in the draw out cradle when the breaker body is in the CONN position Allow connections of external conductor
44. d 90 Arc gas barrier Control circuit contact Gas exhaust port amp Main circuit terminal Mold cover Breaker gt draw out arm i Mold base Ground terminal Pee Ca Specification nameplate g _ oo M8 tapped hole Ce Q Draw out cradle rear view Q Breaker body rear view Fig 11 General view and parts designation 17 KRB 5258 GS 2 8 E Q Q S 9 Q9 IQ 2 2 BQ 2 IQQ ACB Draw out cradle Breaker body OFF button ON button ON OFF indicator Charge indicator Charging handle Position indicator Grip Draw out handle insertion hole Release button Position padlock lever optional Lock in OFF plate optional ON OFF button cover ON OFF cycle counter optional OCR cover Overcurrent release OCR Front cover Rating nameplate Specification nameplate Breaker body roller Main circuit contact Control circuit contact Arc chamber Current sensor Mold cover Mold base Breaker fixing bolt red optional Draw out rail Draw out rail end Hook pin Body stopper Body stopper shaft Rail stopper red Position switches optional KRB 5258 Consists of breaker body G and draw out cradle Q Comes with main circuit terminals control circuit terminals s auxiliary switches 1 and position switches 7 Contains the ON OFF mechanism the closing coil the tripping device and overcurrent release Push to
45. e ACB be used as soon as you have received it If it is necessary to store the AC B note the following Store the ACB in a dry indoor location to prevent condensation due to sudden changes in ambient temperature Condensation has a harmful effect on the ACB insulation Store the ACB in a clean place free of corrosive gases and dust In particular exposure to a mixture of moisture and cement dust may cause corrosion damage to metal parts of the ACB Place the ACB on a flat level surface in its normal position Do not lay the ACB Do not place the ACB directly on the floor Do not stac k the ACBs during storage KRB 5258 8 2 3 Installation Precautions A CAUTION Electrical work must be done by competent persons Do not place the ACB in such an area that is subject to high temperatures high humidity dusty air corrosive gases strong vibration and shock or other unusual conditions Mounting the ACB in such an area could cause a fire or malfunction Be careful to prevent foreign objects such as debris concrete powder dust chippings and iron powder and oil or rainwater from entering the ACB These materials inside the ACB could cause a fire or malfunction Prior to commencing any work on the ACB open an upstream circuit breaker or the like to isolate all sources of power voltage Otherwise electric shock may result Fix the draw out cradle of the ACB firmly on a flat level surface using mounting screws Otherwise th
46. e draw out operation may cause the breaker body or the draw out cradle to fall resulting in damage to the ACB or personal injury Take care not to deform or bend protrusions in the bottom face of the draw out cradle when fixing the draw out cradle with mounting screws Deformation of the protrusions may cause a malfunction Connect conductors including screws to the main circuit terminals in the specified area Otherwise a short circuit may result When terminating conductors to the ACB tighten terminal screws to the torque specified in this manual Otherwise a fire could result For 4 pole ACBs be sure to connect a 3 phase 4 wire neutral conductor to the N phase pole on the right end Otherwise an overcurrent may hinder the ACB from tripping resulting in a fire Draw out cradle mounting screws Hex head M12 4 not supplied with spring washer flat washers 2 and nut Tightening torque 41 52 N m Protrusion P Draw out cradle mounting screw hole Fig 4 Protrusion on the bottom of the draw out cradle Do not install the ACB in such an area that is exposed to direct sunlight Make sure that the mounting base has a sufficient capacity of bearing the weight of the ACB see Table 3 and Table 4 The mounting base must be protected against vibration Take appropriate measures to provide a perfect protection to the mounting base against resonance Otherwise open close operation of the ACB may cause a malfunction of other de
47. e draw out handle clockwise when the breaker body is in the CONN Position Doing so may cause a malfunction If the ACB has the breaker fixing bolts make sure the bolts on both sides are securely tightened before using the ACB Loosened fixing bolts may cause a malfunction of the ACB in particular when it is installed in such an area that is subject to strong vibrations Use the separate draw out handle to insert the breaker body 4 2 3 1 Putting the breaker body back to the ISOLATED position 1 Make sure the draw out cradle Fig 23 is secured with mounting screws 2 Push the rail stoppers Fig 23 G outward on both sides of the draw out cradle to unlock the draw out rail Fig 23 and then uphold and pull out the rail until it stops The draw out rail will be locked again by the stoppers The breaker body Fig 23 Q cannot be inserted unless the rail is locked 3 Use an optional lifter or lifting plate to place the breaker body rollers Fig 24 on the draw out rail Fig 24 Do not leave the ACB body on the draw out rail pulled out 29 KRB 5258 4 If the ACB has the breaker fixing bolts Fig 23 Q make sure the bolts are loosened and holding both the grips Fig 23 firmly push the breaker body into the draw out cradle 5 Push the rail stoppers Fig 23 G outward on both sides of the draw out cradle Fig 23 to unlock the draw out rail and then push the rail ends to insert the rail until it st
48. e order of removal after inspection Fig 44 shows a removed arc chamber Arc extinguishing grids Arc chamber mounting screw NI Fig 44 Arc chamber KRB 5258 46 6 2 3 Stationary contact The following describes how to replace the stationary contact Fig 45 shows the general view around the station ary contact Main circuit contact Stationary contact Mold base zl a Stationary contact tip Moving contact tip Engagement measuring hole Moving contact Ea D B Moving contact mounting screw Insulated operating rod i CLL Ba i Hex socket head M8 x 30 2 3 DP Pa with spring and flat washers Tightening torque 14 7 N m Stationary contact mounting screw B Pan head M6 x 20 2 6 with spring and flat washers Tightening torque 4 7 5 9 N m B Wwe eee 72m ar Poel i F a Stationary contact mounting screw A Pan head M6 x 16 2 6 with spring and flat washers Tightening torque 4 7 5 9 N m Fig 45 General view around the stationary contact 1 Make preparations for parts replacement Refer to section 6 2 1 2 Unscrew the current sensor mounting screws and remove the current sensor and the power supply CT locate d behind the sensor Do not disconnect the control wire hand connectors from the current sensor and power supply CT Place the removed current sensor and CT on the breaker body or floor while avoiding the control wire from being strained See Fig 46 FEH Stationary contact moun
49. e removed from the SHT Hand connector black Y p SHT mounting screw captive ER Pan head M4 x 80 2 with spring washer Contact block ae ms Tightening torque 1 3 1 7 N m Fig 53 Removing the SHT 7 Reinstall each part or component in reverse order of removal after inspection When installing the SHT make sure the nameplate Hand connector black a on the SHT can be viewed from the front of the ACB Fig 54 provides the general view of the SHT SHT mounting screw sd Moving core located in the center hole Fig 54 General view of SHT 91 KRB 5258 6 2 7 Control relay The following describes how to replace the control relay 1 Make preparations for parts replacement Refer to section 6 2 1 2 If the ACB is not equipped with the fixed type undervoltage trip device turn the cover mounting screws five or six turns to loosen as shown in Fig 36 If the ACB is equipped with side covers first remove the side covers and then loosen the front cover mounting screws The cover mounting screws are of captive type and cannot be removed from the side and front covers 3 Pulling the charging handle down remove the front cover 4 If the ACB is equipped with the ON OFF cycle counter disengage the hook located under the cycle counter spring turn the c ycle counter fixing screw two or three turns to loosen do not remove and flip the cycle counter up to the upper right direction See Fig 55 ON
50. ening of contact tips is caused by oxidation or sulfuration and will be removed during 3 and 6 2 4 closing operation It has no harmful effect except in extreme causes If heat discoloration is found perform detailed inspection Check moving and stationary contact mounting screws A and B for looseness If loose retighten Use DC500V Megger to check that insulation resistance between main circuit terminals between main circuit terminal group and ground and between ends of adjacent grids exceeds 5M ohm If resistance does not exceed 5M ohm use sandpaper to remove carbonized portions of insulation around contacts or current carrying parts and or spatters adhered to arc chambers and arc extinguishing grids If problem persists contact us With OCR removed check internal mechanism for missing parts deformation cracks chips foreign Internal mater or dust accumulation breakage of springs and rust If foreign matter or dust is accumulated mechanism use vacuum cleaner to remove foreign matter of dust and wipe off with dry clean cloth If any parts are missing or damaged or springs are broken contact us Control circuit Remove side and front covers check that wiring is properly connected and not disconnected nor See 6 2 5 12 Wiring damaged If incorrect connection is found connect correctly If disconnection or damage is found l contact us Cheek haa en ehes State of Current conducting Current conducting operate as shown the right opera
51. g contact Upper separator FA E un contact mounting screw Fig 50 Moving contact related parts 5 Reinstall each part or component in reverse order of removal a fter inspection As to the moving contact related parts however install the insulated operation rod insulation plate spacer moving contact upper separator lower separator flat washer spring washer and moving contact mounting screw in this order See Fig 49 6 After installing the moving and or stationary contact be sure to perform 10 20 cycles of open close operation and then retighten the contact mounting screws to the specified torque 49 KRB 5258 6 2 5 Latch release coil LRC The following describes how to replace the latch release coil LRC 1 Make preparations for parts replacement Refer to section 6 2 1 2 If the ACB is not equipped with the fixed type undervoltage trip device turn the cover mounting screws five or six turns to loosen as shown in Fig 36 If the ACB is equipped with side covers first remove the side covers and then loosen the front cover mounting screws The cover mounting screws are of captive type and cannot be removed from the side and front covers 3 Pulling the charging handle down remove the front cover 4 Remove the contact block fixing screws as shown in Fig 37 5 Flip the contact block up as shown in Fig 38 6 Turn the LRC mounting screws eight or ten turns to loosen disconnect the manual connector green and
52. g type requires the charging and ON OFF close open operation to be done manually while the motor charging type allows the operation to be done either manually or by using a motor 4 1 1 Charging operation The ACB can be closed only when the closing springs have been charged Be sure to charge the closing springs before closing the ACB The charging operation is permitted regardless of whether the ACB is ON closed or OFF open The pro cedure for charging the closing springs is as follows Manual charging Pump the charging handle Fig 17 Q until the charge indicator Fig 17 Q shows CHARGED Pumping the handle with the full stroke 10 13 times will fully charge the closing springs ON OFF indicator 3 n Q Charge indicator OFF button _ j ON button Lock in OFF plate 9 ON OFF button cover ON OFF button cover G a Charging handle Fig 17 Charging and opening operation 23 KRB 5258 Motor charging When the charge indicator Fig 17 Q changes to DISCHARGED while the specified operation voltage is applied to the control circuit terminals w and the charging motor is activated to start charging the closing springs Upon completion of the charging operation the charge indicator shows CHARGED and the charging motor is automatically deactivated The time required for the motor charging operation depends on the operation voltage or the ACB types but does not exceed 10 seconds 4 1
53. group and ground AC3500V 1 minute Auxiliary Between terminal group and ground AC2500V 1 minute switches Between terminal group and ground AC2000V 1 minute aie eee Between terminal group and ground AC2000V 1 minute Between terminal group and ground AC2000V 1 minute Undervoltage trip device Between terminal group and ground AC2500V 1 minute 6kV 100MQ Reverse power trip device Other accessories Between terminal group and ground AC2000V 1 minute 100MQ The above data applies to new ACBs Device terminals within ACBs are not covered Use a DC500V Megger to measure the insulation resistance Circuit Dielectric withstand voltage 50 60Hz Table 7 shows the internal resistance and power consumption of the ACBs Table 7 Internal resistance and power consumption AC power consumption W for 3 pole ACB _ 200 350 350 OC OC 780 100 _ AR316H AC power consumption W for 3 pole ACB 260 350 499 CH dC Ct OD 8S Table 8 shows applicable current of the ACBs The applicable current varies depending on the ambient temperatures Table 8 Dependence of applicable current on ambient temperature Conductor size Standard Ambient 2 x 50 x St 2 x 80 x 5t 2 x 100 x 5t 3 x 100 x 5t 2 x 100 x 10t 3 x 100 x 10t 4 x 150 x 6t temperature C E AS3947 2 JIS 8201 2 feo CST s nso e i70 24 280 s o Wo feo m wo 0o 160 250 2520 3mo JIS C8372 a so 10o no 1650 2280 210 3230 JEC 160
54. he applicable terminal Nos AC100V unit AC200V unit AC400V unit SEN A 9Y aes Undervoltage trip device power AC110V AC220V AC415V input terminals acizov aczaov acao OFF switch Undervoltage trip Polarity 1 k B N phase CT connection terminals 3 ache peg Reserved 6 21 23 25 26 pore serwiring S O Undervoltage trip device Relay or LED pe 1 For 4 pole ACBs 2 For 4 pole ACBs equipped with N phase protection and or ground fault trip functions 3 Used for 3 pole ACBs with N phase protection and or ground fault trip functions to be installed in a 3 phase 43 wire circuit 4 Do not connect the ON switch with auxiliary switch b contact in series Doing so may cause pumping 5 Conversion ratio CT rated primary current lor A 150 mV 6 Provide power to the overcurrent trip device when control power is lost KRB 5258 20 3rd character Type of contact 1 Common 2 b contact 4 a contact 2nd character Type of switch 1 Auxiliary switch 2 Position switch CONN 3 Position switch TEST 4 Position switch ISOLATED 5 Position switch INSERTED Ist character Number of contact 1 0 Number of auxiliary and position switch A C Number of auxiliary switch for microload Fig 16 provides the terminal arrangement of the ACB Position switches Main control circuit Auxiliary switches Upper stage 151 141 131 121 01 02103 06 07 08 111 211 311 411 511 611 711 811 911 011 Middle stage 154 144 1
55. he general view of the UVT Plunger a Ng Terminal No 1 UVT mounting sere eae r i Terminal No 2 Terminal No 3 Hand connector red 3 Terminals Attraction coil resistance to be measured between terminals 1 and 2 Holding coil resistance to be measured between terminals 1 and 3 Fig 41 General view of UVT 45 KRB 5258 6 2 2 Arc chambers The following describes how to replace arc chambers 1 Make preparations for parts replacement Refer to section 6 2 1 2 Carefully lay the breaker body on spacers with the backside down as shown in Fig 42 The spacers must be at least 7 cm high to prevent deformation of protrusions on the breaker body backside and have the size and strength that allow the breaker body to be safely laid on them Take care to keep the main circuit contacts clean of dust Breaker body 7 cm or higher l Fig 42 Laying the breaker body on spacers 3 Turn the arc chamber mounting screw eight or ten turns to loosen as shown in Fig 43 The arc chamber mounting screws are of captive type and cannot be removed from the arc chamber Arc chamber mounting screw captive Pan head M6 12 16 with spring and flat washers Tightening torque 4 7 5 9 N m Arc chambers 6 8 Arc chambers at the top Arc chambers at the bottom Fig 43 Arc chamber mounting screws 4 Holding the arc chamber mounting screw remove the arc chamber 5 Reinstall each part or component in revers
56. ion method f T Vertical terminals Horizontal terminals can be specified as an option Control circuit terminal type Spring charging method Manual or motor charging Overcurrent release OCR No OCR or L characteristic for general feeder protection Operation indication ee con Standard equipment for OCR equipped ACB Sa Shunt trip device l Undervoltage trip M Number of switches 4C standard 7C or 10C available for general feeder or microload Auxiliary switches Terminal type screw terminals Rated voltage AC100 120V AC200 240V DC100 125V DC200 250V DC24V or DC48V 1 Ambient temperature 40 C 45 C for marine used 2 For vertical terminals 3 For 2 pole applications use two poles at both ends 4 4 pole ACBs are not applicable to power distribution IT systems unless N phase protection is provided 5 Varies depending on applicable standards AC1000V applies to ACBs conforming to IEC60947 2 and JIS C8201 2 6 Varies depending on applicable standards AC690V applies to ACBs conforming to IEC60947 2 and JIS C8201 2 7 Setting the instantaneous trip function to NON reduces the rated breaking current to the rated latching current 8 Applicable to 3 pole ACBs 9 For applicability to power distribution IT systems consult us 10 Applicable under 3 pole serial connection scheme 11 Expected service life based on endurance test The service life of ACB depends on the working and environmental condi
57. ions extend the service life and ensure safe operation The appropriate frequency of maintenance and inspection of the ACB varies depending on the installation conditions the number of tripping operations the magnitude of breaking current and other factors that are to be considered empirically As a guideline Table 22 shows the recommended inspection frequency See section 6 1 for detailed maintenance and inspection procedures Table 22 Frequency of maintenance and inspection Ccisaoe Working and environmental Inspection Frequency in interval or number of open close cycles al conditions level Number of open close cycles Not so dusty Every year or 2 years Open close 1250AF 3200AF or l condition SQORF Or 188 D500AE more Not so much corrosive gases Every year after 3 years Normal i i Nearly no current e Ambient temperature 35 C Detailed since installation igual Every 1000 cycles Normal Not so years since instalation Not so humid years since installation level cycles cycles cycles Number of open close cycles Every 5 or 6 years per day 2 or less Every 4 years after 6 years Ex Switchboards in electric Thorough since installation Every 4000 cycles installation rooms Every year or 2 years after Control rooms 10 years since installation Building installation Overhaul When abnormality is found during normal or through inspection Highly dusty oe T 800AF or less AAE i saad i Much corrosive gases
58. l sound is heard If abnormality is found perform detailed inspection Take care to avoid grinding dust from entering the ACB Wipe contact surfaces clean of grinding dust 00 O1 go KRB 5258 Table 25 Detailed inspection procedure Parting With ACB open remove arc chamber and using feeler gauge make sure distance between moving q distance and stationary contact tips is 20 1mm If not so replace both moving and stationary contacts If it is useless to replace contacts contact us Insert 3 5 4 0 mm dia x 50 mm length rod into engagement measuring hole vertically until it stops and measure protrusion of rod when ACB is open and closed Make sure difference in protrusion is 2 Engagement following line side 2 7 3 4mm load side 2 7 4 0mm The difference of the value of line side and Contacts load side must not exceed 1 0mm If not so replace both moving and stationary contacts If it is See 6 2 2 6 2 useless to replace contacts contact us 3 and 6 2 4 With ACB closed remove arc chamber and using graduated ruler make sure displacement 3 Displacement between corresponding contact tips is within 2 mm If displacement is 2 mm or more replace both moving and stationary contacts If it is useless to replace contacts contact us With ACB closed remove arc chamber and using tester make sure resistance between moving and stationary contact tips is not more than 100 uQ If not so replace both moving
59. manual charging possible Check the operation voltage Supply correct voltage the control circuit and terminals See Nos 5 and 12 in Table Contact Terasaki Is manual charging possible Is motor charging possible Contact Terasaki Fig 66 Remedial actions against a symptom of charging impossible The ACB cannot be opened Is manual opening Possible Contact Terasaki Check the operation voltage and SHT voltage Supply correct voltage the control circuit and terminals See Nos 5 and 12 in Table Check SHT MHT and UVT See Nos 11 25 Repair replace in Table 25 Is electrical opening possible Contact Terasaki Fig 67 Remedial actions against a symptom of opening impossible KRB 5258 The ACB cannot be closed Does the operation mechanism work well No Are closing springs charged Yes Is the ACB body in an intermediate position No Is the OFF button locked or any other OFF lock active No Is the SHT trip command active No Check the UVT attraction voltage OK Check SHT MHT and UVT See Nos 15 17 and 22 in Table OK Check the operation mechanism See No 11 In Table 24 OK Is manual closing possible Yes Fig 68 Remedial actions against a symptom of closing impossible Yes Is manual closing possible No Yes No Charge Yes Move the body to the CO
60. may result Do not force down the charging handle after completion of manual charging operation Doing so may cause a malfunction The permissible operating voltage of the spring charging motor is 85 to 110 of the rated ac voltage or 75 to 110 of the rated dc voltage Be sure to supply a voltage within the above ranges to the motor Otherwise burnout may result Repeated open close operation by the motor charging mechanism without pause should not exceed 15 times If repeated continuous open close operation is inevitable a pause of at least 20 minutes should be provided after the repetitions of 15 times Otherwise a spring charging motor may be burnt out Do not bring your hand or face close to arc gas vent of the arc chamber while the ACB is energized Otherwise a burn may result from high temperature arc gas blowing out of the arc gas vent when the ACB trips open If the ACB trips open automatically remove the cause of tripping operation before re closing the ACB Otherwise a fire could result If the ACB has the breaker fixing bolts make sure the bolts on both sides are securely tightened before using the ACB Loosened fixing bolts may cause a malfunction of the ACB in particular when it is installed in such an area that is subject to strong vibrations The ACBs are available in two types in terms of the closing spring charging method and the remote operation capability a manual charging type and a motor charging type The manual chargin
61. n out or inserte d irrespective of the state of the other ACB s NOTE Do not draw out or operation check E Specifications ii GS r 1 min 200 mL ia Et Parthon not supplied Space for interlock cables n case of fixed type m1 mm 3 w3 ACB front cover centre line insert an ACB body during cable installation adjustment or There should be a minimum of 200mm gap left between the interlock mechanism and the cabinet wall this is to enable cable installation adjustment or operation check 65 KRB 5258 E Mounting the ACBs e Before mounting the ACBs check the type of interlock number and length of the cables to ensure they are as ordered e Install the ACBs for fixed type or chassis for draw out type in the switchboard see specifications section aformentioned for dimensions e When installing the ACBs be sure to locate each ACB as you have specified i e middle left or right when ordering A different arrangement does not permit correct installation of the interlock cables e If the ACBs are draw out types do not insert the bodies into the chassis until the installation of the inter lock system has been complete If the ACBs are fixed insure the ACBs are locked off during installation E Cable Connections The following illustration shows he connections between the ACBs T cabe Fe SES ype Cable Priority D TYPE C EE EE TYPE B TYPE D TYPE A E Mounting the Ca
62. n the terminal screws periodically to the specified torque Otherwise a fire could result When grinding a contact tip be careful to prevent grinding dust from entering the breaker operating mechanism Wipe the tip clean after grinding Otherwise a malfunction or fire could result Do not perform dielectric withstand tests under other conditions than specified Doing so may cause a malfunction Be sure to reinstall the arc chamber if removed Failure to do so or incorrect installation of the arc chamber may result in a fire or burn When charging the closing springs or performing open close operation of the ACB with the arc chamber front cover and or side covers removed during maintenance or inspection work do not touch parts other than those required for the above operation charging handle ON OFF buttons moving core and the like Doing so may cause fingers or tools to be pinched resulting in injury When replacing an auxiliary do not damage the control wire for the auxiliary or pinch the wire between the auxiliary and the breaker body Doing so may cause a malfunction KRB 5258 6 2 RECEIVING AND HANDLING Upon receipt of your ACB check the following If you have any question or problem contact us at the indicated on the back cover of this manual 2 1 Check that the ACB received is as ordered and that the accessories are as specified Check that the ACB is not damaged during shipment Transportation Precautions gt
63. ness If loose retighten Disconnect hand connector red and using tester measure coil resistance between terminals and make sure itis 1 8 2 2 Q If not so replace MHT 22 Operation Remove MHT and pull out moving core slowly and make sure pushing moving core allows core to p be smoothly retracted and attracted If not so replace MHT 21 Coil resistance ed te 23 pai a Remove MHT and using vernier caliper make sure moving core length is 2 2 2 8 mm in pushed See 6 2 8 moving core state and protrusion of moving core is 6 7 7 3mm in pulled out state If not so replace MHT Hand Check that hand connector red is connected to ACB hand connector red correctly If incorrect connector connect correctly Looseness of PTE Check MHT mounting screws for looseness If loose retighten With breaker body assembled to original state move breaker body to TEST position supply ACB Electrical with operation power and attempt to perform motor charging and electrical closing operation with operation max and min voltages within permissible charging closing voltage range to make sure ACB operates normally See Table 10 If ACB does not operate normally contact us With breaker body assembled to original state move breaker body to TEST position close ACB Charging motor and LRC NO N N N k Sz gt O D Electrical supply SHT with power and attempt to perform electrical opening operation with max
64. olerance 15 0 15s 0s Short time delay trip pickup current h x 1 1 5 2 2 5 3 4 6 8 10 NON A Tolerance 15 Short time delay trip timing Resettable time ms Max total clearing time ms ES Short time delay trip t mode ON OFF Instantaneous trip pickup current 6 8 a 16 s a Ground fault trip pickup current 2 ler x 0 1 0 2 0 3 0 4 0 6 0 8 1 0 NON A Tolerance 20 1000 2000 Ground fault trip timing Oo Eesaeime mes E E 8 1975 1070 2070 3 Ground fault trip t mode ON OFF Os CT rated primary current display only field a Factory set rated current display only field Underlined values are default settings NON setting disables protective functions If the short time delay trip function and the instantaneous trip function are set to NON however the fail safe operates so that e The instantaneous trip function is activated at h x 16 or more if the short time delay trip function and the instantaneous trip function are set to NON A pickup current means the threshold by which the OCR determines whether or not an overcurrent occurs When the current flowing through the OCR exceeds the pickup current setting provided that p x 1 05 lt pickup current setting lt r x 1 2 the OCR starts counting the time for tripping Once the current flowing through the OCR reduces to less than the pickup current setting time count is reset 1 A change in rated current setting results in changes in long time delay
65. olt Spring washer Flat washer Fig 29 Securing the breaker fixing bolts 4 7 OCR Cover Locking Procedure Lock the OCR cover using a padlock with 66 shackle as shown in Fig 30 The OCR cover cannot be opened which prevents OCR settings from being changed OCR cover 33 KRB 5258 5 OVERCURRENT RELEASE OCR Options available for the type AR ACBs include a highly reliable multi functional overcurrent release OCR with a built in 16 bit microprocessor This OCR is supplied with power through a CT and main circuit current signals from current sensors When the OCR detects a fault it sends a trip signal to the magnet hold trigger MHT or provides a trip indication or an alarm depending on the type of the fault The OCR uses the root mean square sensing for the long time delay LTD and N phase protection NP functions When six times the CT rated primary current is exceeded the peak value sensing is used instead I f a harmonic current flows through the ACB continuously the root mean square sensing allows the ACB to operate normally The OCR is available in the type that follows AGR 11BL L characteristic for general feeder for works and transformer protection 5 1 Specifications Specifications of the OCR are shown in Table 19 Table 19 Specifications of type AGR 11B OCR I Standard Optional Not applicable For general feeder ease pak Type designation AGR 11BL AL AGR 11BL GL Trip indication Gro
66. ops The draw out rail will be locked again by the stoppers Breaker body Fig 24 Placing the breaker body on the draw out rail 4 2 3 2 Moving the breaker body from the ISOLATED position to the TEST position 1 Make sure the ON OFF indicator Fig 23 shows OFF If the ACB remains closed the draw out handle Fig 23 Q cannot be inserted 2 Unlock the position lock lever Fig 23 if locked See section 4 5 3 Insert the draw out handle into the draw out handle insertion hole Fig 23 and slowly turn clockwise until the position indicator Fig 23 G shows TEST The ACB cannot be closed as long as the draw out handle is in the draw out handle insertion hole To close the ACB e g for ON OFF testing remove the draw out handle 4 2 3 3 Moving the breaker body from the TEST position to the CONN position 1 Open the ACB If the ACB remains closed the draw out handle Fig 23 Q cannot be inserted 2 Unlock the position lock lever Fig 23 if locked See section 4 5 13 of 14 tums 3 Press the release button Fig 23 G The release button will be locked depressed 2 4 Insert the draw out handle into the draw out handle insertion hole Fig 23 and J BE E turn clockwise until the position indicator Fig 23 G shows CONN and the z i Bake handle cannot be turned with its max operating torque 14 7 N m j Position Turning the draw out handle will unlock the release button Fig
67. or practices before installing operating or servicing the ACB In this manual safety notices are divided into DANGER and CAUTION according to the hazard level D DANGER A danger notice with this symbol indicates a potentially hazardous situation which if not avoided could result in death or serious injury AN CAUTION A caution notice with this symbol indicates a potentially hazardous situation which if not avoided may result in minor or moderate injury and or property damage Note that failure to observe a caution notice could result in serious injury damage in some situations Because safety notices contain important information be sure to read and observe them n Transportation Precaution gt DANGER Never stand under the ACB that has been lifted or suspended by a lifter or lifting attachments The weight of the ACB may cause serious injury n Installation Precautions CAUTION Electrical work must be done by competent persons Do not place the ACB in such an area that is subject to high temperatures high humidity dusty air corrosive gases strong vibration and shock or other unusual conditions Mounting the ACB in such an area could cause a fire or malfunction Be careful to prevent foreign objects such as debris concrete powder dust chippings and iron powder and oil or rainwater from entering the ACB These materials inside the ACB could cause a fire or malfunction Prior to commencing any
68. orrect application of the instructions provided herein The contents of this manual may be subject to change without prior notice 63 KRB 5258 AN CAUTION E SAFETY Be sure and read all instructions and associated documents acc ompanying the product thoroughly to familiarise yourself with the product handling safety information and all other safety precautions E l Installation Precautions e Installation work of the interlock must only be carried out by quali fied and authorised personnel e Do not use the interlock in areas that are subject to high temperatures high humidity dusty air corrosive gasses strong vibration and shock Using the interlock in these conditions may cause a malfunction e Care should be taken to prevent foreign objects such as debris concrete powder dust chippings oil and rainwater from entering the interlock Using the interlock in these conditions may cause a malfunction e If the ACBs are draw out types do not insert the bodies into the chassis until the installation of the interlock system has been complete If the ACBs are fixed insure the ACBs are locked off during installation Failure to do so may result in damage to the interlock or personal injury e Do not bend the interlock cables at the radius of less than 200mm Doing this may result in damage to the interlock cables causing the interlock to fail o Insert the interlock wire until it stops at the grove end of the lever Insuffi
69. r voltage from the main and control circuits Otherwise electric shock may result Take care to avoid adhesion of dust to main and control circuit contacts Dust on the contacts may result in a fire Prior to commencing maintenance inspection or parts replacement make sure that the closing springs are released and the ACB is open Otherwise unintentional open close operation may lead to fingers or tools to be pinched by the open close mechanism resulting in injury Retighten the terminal screws periodically to the specified torque Otherwise a fire could result When grinding a contact tip be careful to prevent grinding dust from entering the breaker operating mechanism Wipe the tip clean after grinding Otherwise a malfunction or fire could result Do not perform dielectric withstand insulation resistance tests under other conditions than specified Doing so may cause a malfunction Be sure to reinstall the arc chamber if removed Failure to do so or incorrect installation of the arc chamber may result in a fire or burn When charging the closing springs or performing open close operation of the ACB with the arc chamber front cover and or side covers removed during maintenance or inspection work do not touch parts other than those required for the above operation charging handle ON OFF buttons moving core and the like Doing so may cause fingers or tools to be pinched resulting in injury When replacing an auxiliary do not damage the
70. result Do not leave the ACB body in the removed position The weight of the ACB may cause serious injury A CAUTION If the ACB has the breaker fixing bolts be sure to loosen the bolts on both sides before draw out operation Otherwise damage to the ACB may result Make sure the draw out cradle is secured with mounting screws before drawing out the breaker body Otherwise the draw out operation may cause the breaker body or the draw out cradle to fall resulting in damage to the ACB or personal injury When retracting the draw out rail into the draw out cradle be sure to push the rail end Do not hold the hook pin body stopper or body stopper shaft Doing so may cause your fingers to be pinc hed resulting in injury Use the separate draw out handle to draw out the breaker body 4 2 2 1 Moving the breaker body from the CONN position to the TEST position 1 Open the ACB If the ACB remains closed the draw out handle Fig 23 Q cannot be inserted 2 Loosen the breaker fixing bolts Fig 23 Q if used to unlock the breaker body Fig 23 Q 3 Unlock the position lock lever Fig 23 if locked See section 4 5 4 Insert the draw out handle into the draw out handle insertion hole Fig 23 and slowly turn counterclockwise until the position indicator Fig 23 G shows TEST When the main circuit is disconnected at the disconnect contacts the breaker body will be slightly pushed forward by the spring action of
71. s These terminals are available in three configurations as shown in Fig 13 Horizontal terminals Front terminals Fig 13 Main circuit terminals Allows lifting attachments or wire ropes to be used for lifting the ACB Refer to section 2 3 Installation Precautions Use to draw out insert the breaker body from into the draw out cradle 19 KRB 5258 3 3 Circuits and Ratings Fig 14 shows an ACB circuit diagram and Table 9 and Fig 15 show the function of each terminal and the meaning of each sign in the diagram Main Speracion kiriin Sow uta tare tp Position a eed 2 ic ci cuit wialen PTAR eee dei ie Auxiliary wibi Swi KE at tare eq pent Grimal phi a kl T a Zs LIR Fip eae F p F T ERI T H l ale Jeske bzy Tie sik EPS DS ee me Slit An le le Pls Be ele Fig 14 Breaker circuits Table 9 Terminal functions and circuit symbols Applicable to both 50 and 60Hz for AC and mean the polarity for DC Function Babe oe crate ee Seen ee ees ROCHON S SOS n n AC100 120V AC200 240V DC100 125V DC200 250V DC24V or DC48V To Osero Sowa nourien be stated when ordering p p p Spring charged indication i AC100V AC110V AC120V AC200V AC220V AC240V DC24V DC48V DC100V Shunt trip device power input DC110V DC125V DC200V or DC220V To be stated when ordering terminals AC100V AC200V or AC400V unit To be stated when ordering Connect the unit to t
72. s closed and the ACB is in the isolated position Adjustment plate The handle shutter is a good position at the centre of the hole and no adjustment is required KRB 5258 When the handle shutter is at the left of the hole remove the adjustment plate This will push against the handle shutter less moving it towards the centre of the hole When the handle shutter is at the right of the hole turn the adjustment plate upside down with the double side to the top This will push against the handle shutter more moving it towards the centre of the hole Door Interlock Outline Dimensions amp Arrangement Drawings E ACB FRONT COVER CENTRE LINE HINGE peaa Th DOOR PANEL _DOOR PANEL 250 yf Pi Li H E i DOOR PANEL _ SCREWS Y TOP View DOOR PANEL CUTOUT Pa x DRAW OUT HANDLE STORAGE OOOR PANEL FRONT VIEW PARTS OF DOOR PANEL th 9 MECHANICAL INTERLOCK DEVICE HORIZONTAL TYPE TYPES AKR 1MH Applicable Breaker Types Group AR208S AR212S AR216S AR220S AR212H AR216H AR220H AR4 AR325S AR332S AR316H AR320H AR325H AR332H AR440S The mechanical interlock system allows up to three ACBs to be selectively turned on or off to the configured requirement Please read these instructions carefully to ensure correct operator use The Manufacturer assumes no responsibility for the damage resulting from non application or inc
73. sition Doing so may cause a malfunction If the ACB has the breaker fixing bolts make sure the bolts on both sides are securely tightened before using the ACB Loosened fixing bolts may cause a malfunction of the ACB in particular when it is installed in such an area that is subject to strong vibrations OCR setting changes must be performed by competent persons Use a small flatblade screwdriver with a torque of not more than 0 1 N m or a force of not more than 0 1 N when adjusting the setting switches rotary step switches or slide switches An excessive torque or force may cause a malfunction ACB maintenance inspection and parts replacement must be performed by competent persons Do not touch ACB current carrying parts and ACB structural parts close to a current carrying part immediately after the ACB trips open Remaining heat may cause a burn Prior to commencing any work on the ACB open an upstream circuit breaker or the like to isolate all sources of power voltage from the main and control circuits Otherwise electric shock may result Take care to avoid adhesion of dust to main and control circuit contacts Dust on the contacts may result in a fire Prior to commencing maintenance inspection or parts replacement make sure that the closing springs are released and the ACB is open Otherwise unintentional open close operation may lead to fingers or tools to be pinched by the open close mechanism resulting in injury Retighte
74. switch knob Rotary step switch Slide switch Fig 32 OCR characteristic setting switches 4 Close the OCR cover 5 After setting changes are made it is recommended that the settings be checked with e g a type ANU 1 OCR checker optional 37 KRB 5258 5 4 Operation Indication The OCR has LEDs on the front panel to provide operation indications as shown in Fig 35 and Table 21 It also outputs operation signals to contacts Fig 35 LEDs Table 21 Operation indication Control Type of OCR power Operation State S OE TerminalNo State supply Poston Trip Alarm See Fig 14 Trip Alarm a time delay trip LT N phase protection NP Turn OFF AGR 11BL AL Nerrasuitsa Shor time delay tip ST ftime delay tip ET Flash automatically after AGR 11BL GL ot require ort time delay dp ON for 40 ms or BE fault trip more 1 Instantaneous trip INST trip e en 1 Aself hold circuit is required KRB 5258 38 6 MAINTENANCE INSPECTION AND PARTS REPLACEMENT This chapter describes the maintenance and inspection procedure for the AR series ACBs The service life of the ACB depends on the working and environmental conditions The ACB is exposed to mechanical and electrical stresses and thus suffers gradual degradation during use which will increase the possibility of malfunctions Preventive maintenance and periodical inspection are very important to avoid any functional degradation prevent malfunct
75. tates counterclockwise Closing cam Q is pushed up by charging lever and rotates clockwise At this time each component is positioned as shown in Fig 20 Continued to Fig 19 Fig 18 Closing motion 1 discharge motion cia i ik Closing cam Q rotating clockwise causes closing link and top link to be pushed straight This rotates closing toggle cam connected with closing link Q counterclockwise so that crossbar rotates clockwise and thus moving contact comes in contact with stationary contact At this time each component is positioned as shown in Fig 21 Fig 19 Closing motion 2 KRB 5258 The charging handle or the charging motor provides a counterclockwise rotation to charging cam Q This rotates closing release lever Q and closing tripper lever G counterclockwise and a semicircular pawl engages with closing release lever Q And charging lever Q rotates clockwise so that closing spring O is compressed and closing cam 5 rotates counterclockwise At this time each component is positioned as shown in Fig 18 Fig 20 Charging motion For manual opening operation OFF button Q rotates counterclockwise and trip linkage Q rotates clockwise For electrical opening operation push rod Q protrudes downward from the shunt trip device SHT or the undervoltage trip device UVT For tripping operation by the overcurrent release OCR moving core Q protrudes downward from the magnet hold trigger MHT
76. th a sound The ON OFF indicator Fig 17 shows OFF 4 1 4 Motion of trip indication and spring charge indication switches The trip indication and spring charge indication switches provide the breaker status as shown in Table 16 Table 16 Motion of trip indication and spring charge indication switches Contact output Stat Type of OCR Operation Terminal No on See Fig 14 Closing spring l ACB closed ACB open Charged Discharged Not ready to close Ready to close All Ready to close means that all of the following conditions are met 1 The closing springs are charged 2 Opening operation is complete At least 40 ms has elapsed after trip signal was produced 3 The OFF button is released 4 The specified voltage is applied to the undervoltage trip device if equipped KRB 5258 24 4 1 5 Motion of operation mechanisms Figs 18 21 illustrate the motion of the charging and ON OFF mechanisms E ee in a z il r m 4 i i F i For manual closing operation ON button rotates counterclockwise For electrical closing operation push rod Q protrudes downward from the latch release coil LRC and charge latch trigger Q rotates clockwise This rotates closing trigger shaft G clockwise and closing release lever disengages from a semicircular pawl and rotates clockwise And charging cam G rotates counterclockwise so that charging lever disengages from closing spring and ro
77. th is 24 2 24 8 mm in natural state plunger Mechanical 10 motion and protrusion of plunger is 6 3 7 mm when moving core is pushed in If not so replace SHT a 13 Hand Check that hand connector black is connected to ACB hand connector black correctly If See 6 2 6 connector incorrect connect correctly Looseness of screws Check SHT mounting screws for looseness If loose retighten With ACB closed check that pushing moving core results in ACB being opened slowly and releasing moving core results in the core being restored smoothly If not so replace SHT If it is useless to replace SHT contact us After inspection discharge closing springs Disconnect hand connector red and using tester measure coil resistance between terminals and 16 Coil resistance make sure holding coil is rated at 410 510 Q and attraction coil at 5 6 6 8Q If not so replace Mechanical motion o1 UVT Remove UVT and press in plunger and make sure releasing plunger causes plunger to be smoothly 17 Operation Undervoltage restored If not so replace UVT a 18 ele Remove UVT and using vernier caliper make sure plunger length is 32 5 33 5mm in natural state See 6 2 1 plunger and plunger stroke is 6 5 7 5 mm If not so replace UVT Hand Check that hand connector red is connected to ACB hand connector red correctly If incorrect connector connect correctly eee oi Check UVT mounting screws for loose
78. ting screws A l aiia r Current sensor mounting screws Pan head M6 x 16 12 b n A Pan head M4 x 12 6 with spring and flat washers F aeia with spring and flat washers Tightening torque 4 7 5 9 N m Tightening torque 1 3 1 7 N m Allen wrench holes iv 4 sf Engagement measuring hole marked with while lines TS Job 4 marked with while line a lt Stationary contact mounting screws B i witi Pan head M6 x 20 12 i We Eii with spring and flat washers i Tightening torque 4 7 5 9 N m Current sensor i i r I 1 ed i ee Fig 46 Stationary contact 3 Unscrew stationary contact mounting screws A and B 47 KRB 5258 4 Tilt and remove the stationary contact as shown in Fig 47 Current sensor Control wire N phase unit is marked with N in this area Stationary contact tilted a _ Power supply CT i ait ee Stationary contact gt a Stationary contact ionary arcin n Stationary arcing contact removed Fig 47 Removing the stationary contact 5 Reinstall each part or component in reverse order of removal after inspection As to the moving contact related parts however install the insulated operation rod insulation plate spacer moving contact upper separator lower separator flat washer spring washer and moving contact mounting screw in this order See Fig 56 6 After installing the moving and or stationary contact be sure to perform 10 20 cy
79. tion lever between _11 and _12 between _11 and _14 13 Operation If not so replace switches Natural position 100 mQ or less Auxiliary Uppermost lift See 6 2 9 14 Auxiliary Remove auxiliary switches and check contacts for roughness If roughened excessively replace contacts contacts Looseness of screws Draw Draw out and insert breaker body to check that draw out handle can be turned with max operating 16 out insertion _ torque or less position indictor provides correct indication release button operates normally and no mechanism abnormal sound is heard during handle operation If abnormality is found contact us 47 UVvT With breaker body in ISOLATED position charge closing springs manually and attempt closing ACB to make sure ACB cannot be closed If ACB can be closed perform detailed inspection With breaker body in TEST position and operation mechanism SHT and UVT supplied with power perform closing spring charging operation and manual and electrical open close operation several w 9 lt 3 3 S D O 5 Arc chamber Main circuit Arc Insulation chamber resistance Operating mechanism Check screws of auxiliary switches for looseness If loose retighten Operation related mechanism See 4 1 and 4 2 Operation mechanism times to check that charge indicator ON OFF indicator and ON OFF cycle counter provide LRC SHT and Ee ea i aan i UVT correction indication and no abnorma
80. tions Refer to chapter 6 Maintenance Inspection and Parts Replacement 12 For vertical terminals 13 This manual covers draw out type ACBs Use the ACBs in the environmental conditions specified in Table 5 Table 5 Operating environment Standard 45 to 85 rel max environment Standard equipped ACBs No excessive water vapor oil vapor dust or corrosive gases No sudden change in temperature and no condensation Atmosphere Ammonia NH3 0 5 ppm max Hydrogen sulfide H2S sulfur dioxide SO2 hydrogen chloride HCI 0 1 ppm max Chlorine Cl2 0 05 ppm max Tropical environment aekaae Different from standard ACBs in that Ambient temperature 60 C max and Humidity 95 rel max no condensation Special environment ee Different from standard ACBs in that Ambient temperature 25 C min for use and 40 C min for storage no condensation Optional t A a Different from standard ACBs in that NH3 50 ppm max H2S 10 ppm max SO2 HCI 5 ppm max and Clo 1 ppm max 15 KRB 5258 Table 6 shows the dielectric withstand voltage and the insulation resistance of the ACBs A CAUTION Do not perform dielectric withstand insulation resistance tests under other conditions than specified Doing so may cause a malfunction Table 6 Dielectric withstand voltage and insulation resistance Insulation Impulse withstand resistance voltage Uimp DC500V Megger Main circuit Between poles and terminal
81. up indication LED and contact output Test function Control power supply Not required Not required Long time delay trip LT Short time delay trip ST ae Instantaneous trip INST Ground fault trip GF 5 2 N phase protection Protection It ON OFF ST characteristic It ON OFF GF ee KRB 5258 34 5 2 Characteristics 5 2 1 L characteristic for general feeder A general view characteristic settings and characteristic curves of the type AGR 11BL OCR with L characteristic are shown in Fig 33 Table 20 and Fig 34 respectively Fig 33 General view of tyoe AGR 11BL OCR with L characteristic Table 20 Settings of type AGR 11L OCR with L characteristic CT rated primary current er x 0 5 0 63 0 8 1 0 A Applied cr A eee Rated current h A Lanoime delavirianidk Enemi j h x 0 8 0 85 0 9 0 95 1 0 NON A ong time delay trip pickup current continuous R e Non tripping at not more than p x 1 05 Tripping at more than r x 1 05 and not more than p x 1 2 O N phase protection trip pickup current let x 0 4 0 5 0 63 0 8 1 0 Fixed to a single point continuous N e Non tripping at not more than h x 1 05 Tripping at more than y x 1 05 and not more than p x 1 2 Longtime delavNaoh ateston istimi i Long time delay 0 5 1 25 2 5 5 10 15 20 25 30 sec at 600 of iR Tolerance 15 0 15s 0s a a a A R N phase protection 0 5 1 25 2 5 5 10 15 20 25 30 sec at 600 of n T
82. us quo and schedule Permissible power cut date and time Place where you want us to take action The contents of the nameplate should be provided in detail Related documents such as product specifications and inspection reports should be provided If you have a desired inspection and maintenance schedule let us know the schedule at your earliest convenience Our service representative could not meet your last minute requirement KRB 5258 40 Table 24 Normal inspection procedure Check point Check item Discoloration Check connection conductors main circuit terminals and current carrying parts for heat of conductors discoloration If such a symptom is found contact us 5 Parte missin Check that screws bolts nuts washers springs retainers and the like are not missing If any parts g are missing contact us General a is Check for deformation cracks chips or other damage of parts If damage is found contact us Check that no dust is accumulated in ACB If dust is accumulated use vacuum cleaner to remove dust and wipe off with dry clean cloth Main control Check main circuit terminal screws ground terminal screw auxiliary switch terminal screws control circuit terminals circuit terminal screws and position switch terminal screws for looseness If loose tighten to specified torque Check that contacts have no dust accumulation and discoloration If dust is accumulated use vacuum cleaner to remove dust and
83. vent functional degradation c aused by aging or the like when abnormality is found during normal inspection You are recommended to use Terasaki s detailed inspection service Thorough inspection must be left to Terasaki Overhaul will be done in a Terasaki s factory A l About the service life The expected service life of AR series ACBs is shown in the Endurance in number of ON OFF cycles rows in Tables 3 and 4 With maintenance in the tables means that appropriate inspection maintenance repair and parts replacement are performed according to the instructions in this chapter But when an ACB performs three times of tripping operation nearly at the rated breaking current three standard operating duty cycles it is at the end of its safe service life even if thorough inspection is done every time it trips open Such an ACB will be apt to suffer malfunctions and should be replaced without delay to avoid frequent inspection and parts replacement See section 6 2 for detailed parts replacement procedures 39 KRB 5258 6 1 Inspection Procedures CAUTION ACB maintenance inspection and parts replacement must be performed by competent persons Do not touch ACB current carrying parts and ACB structural parts close to a current carrying part immediately after the ACB trips open Remaining heat may cause a burn Prior to commencing any work on the ACB open an upstream circuit breaker or the like to isolate all sources of powe
84. vices in the switchboard or vibrations of the switchboard may cause a malfunction of the ACB Use the following screws with appropriate length for the main circuit terminals Main circuit terminal screws Hex head M10 with flat washers 2 spring washer 1 and nut 1 per screw Tightening torque 22 5 37 2 N m Table 1 Number of main circuit terminal screws required AR2208 AR3258 AR332S ACB type AR2088S AR212S AR216S AR212H AR216H AR220H B mina AR320H AR325H AR332H AR440S Number of main circuit Vertical terminals 12 16 18 24 OOOO wR OS A8 terminal screws 3 4 pole Horizontal front terminals 12 16 18 24 E Front terminals are not applicable for high performance ARxxxH types Use the following screw for the ground terminal The screw must have a length that allows it to be inserted 4 9 mm into the ground terminal M8 tapped hole Ground terminal screw M8 1 with spring washer and flat washer Tightening torque 11 8 14 7 N m 9 KRB 5258 Back view Right side view e Vertical terminals 4 Poles Back view 20 Connect conductors to the main circuit terminals in the conductor connection area as shown in Figs 5 7 Right side view e Vertical terminals 3 Poles 2Y T RA sh LULL 2f _ TRAA N ZAY RRQ N WY ZA VA 225 AA p Y ARB Gf A XX SG WW GEESE oY TRAWA CE ol T NIINI SY ANA SY 1 IW WY WY WG

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