WAG 12B QUESTION BANK 1) Draw the Layout of WAG 12B Machine Room Layout and name the parts in a correct sequence, 2) Write IMP cocks provided in Brake Control Module. BCM and explain them in one sentence. 3) Name the different brakes provided in WAG'12B Loco and write the EB reset procedure. 4) Write WAG12B DEAD LOCO Energization Procedure in a correct sequence. 5) What are the precautions to be taken while moving WAGI2 B Loco as DEAD. 6) Write WAG12B cab changing procedure in a correct sequence. 7) Write WAG12B Backup brake PTDC procedure and precautions. 8) Write items provided in a Central Panel and explain in one sentence. 9) Write Different Panels provided on WAG12B Loco Pilot desk 10) Write items provided in CCR and their position, write about them in one sentence. 11) Write WAG12B grounding procedure in sequence. 12) Trouble shooting for a) TBC failed b) VCD malfunctioning ©) Pantograph not raising 13) Trouble Shooting for 1) VCB not glowing. 2) BUS HL’s not glowing 3) Flasher Light not glowing 14) What are the important equipment to be checked in WAG12B Loco under gear 15) Write 3 Phase & 1 Phase Auxiliaries in WAGI2B loco for one section 16) Write about vigilance management system in WAG12B loco. 17) What are the equipment available in the MASU and Ventilation Block. 18) How wit you conduct Loco Brake Power Test in WAGI2B. 19) What will be the operation effect when, a) one E-block blower fails and b) one TM blower fails? 20) No. of suspensions provided in each Section/Loco. 21) How will you trouble shoot if MR Not Building UP. 22) How will you trouble shoot if VCB not closing after Neutral Section 23) How will you troubleshoot if BP not charging. 24) How will you trouble shoot if Master Controller (Throttle) Fails. 25) How will you troubleshoot if Panto Not raising. Page 1of 14BIT: 1) Parking gauge shows BCI & BC2 gauges shows in that particular section recordings 2) Buzzers Provided : a, Fire detection b. Vigilance alert c. Parking Brakes applied / UB applied 3) MASCON . key comes out only DDS in OFF Position . 4) SPM sensor connected to Axle no. 3, Wheel No. 5. 5) Purpose of lamp test switch in LP right side panel to test indication lamps. 6) When ever CCR push button and switch pressed both cabs light and Machine Room lights glows for 15 Min 7) CCR Machine Room / Gang way light switch works after CE ON 8) From any cab we can switch on CE with Battery Connect Switch. 9) To switch ON/OFF CE 90 sec will takes place. 10)CE self hold mode is 10 min 11) Wheel no. 2 & 7. earth return bushes proved. 12)On every gear box Motor Speed Sensor_ provided 13) Traction link Bolts : 18/14 14) Sanding : every Front axle of each section 15)Stone deflector height : 102mm and 40 16) Panto is Purely Pneumatic and Single step Panto 17)Pantograph is High Reach Panto and operating range of OHE 4.58 mts to 7.52 mts from rail level . 18) Normally pantograph raising 8 to 10 sec lowering time 6-8 secs. 19) Pantograph operating pressure 6.2 Kg/sq cm. 20) 10 Its Panto reservoir is provided on back side pneumatic panel 21) Panto reservoir gauge provided in Brake Control Module (BCM) 22) Pantograph isolation cock is provided in PCU (Panto Control Unit) LP Backside 23) Working cab pantograph selector switch decides which Panto will raise. 24) In case of PSS on Both sections HATs opens automatically 25)In WAG 128 entered in unwired track it detects over height and lowers Panto in 2 8 26) VCB opens automatically same some examples : i) OHE out of range ii) Main Transformer Oil Temperature exceeds. iii) Main Transformer Oil Pressure exceeds. 27) Each section Battery consists of i) 2 Battery Boxes 20+20=40 cells iii) HOV, DC 28) If BA voltage drops below i) 89V Alarm ii) 85V Loco will shut down 29) MR safety valve setting 10.7 Kg/Cm* MCP Safety Valve Setting is 12.2 Kg/Cm? 30) If MASU isolation cock is closed that section MCP will not work 31)MCP Cut In and Cut Off 8 Ke/Cm? and 10 Kp/Cm? Page 2 of 1432) Aux Compressor Cut IN and Cut Off § Ke/Cm? and 7 Kg/Cm* 33)MCPA Safety Valve setting 9 Ke/Cm* 34) If MR pressure drops below 5.5 Kg/Cm? emergency Brakes will apph 35) BP cock and MR cock of BCM closed condition Brake Electronic will not energise. 36) PER COS isolation BP will not charge 37) If Aux Cock closed MCPA will not work and Panto will not ralse 38) PCU Cock closes Panto will not raise happens 39) Energy consumption/ Regeneration will be available High Voltage Status page on DDU 40) Panto can be raised and lowered by toggle switch and DDU. 41) VCB can be closed and opened by Toggle switch and DDU. 42) Marker light, Flasher Light and Head Light can be operated by toggle switch and DDU 43) If speed exceeds MPS more than 5% warning comes and exceeds 10% Over speed penalty brakes applied. 44) Location of CB 100 LP side Battery Box 45) If brake system fails to reset traction stop the train and open VCB 46) Main transformer oil level should be #20°C 47)E Block water level should be between 22°C to 70°C 48) Stone deflectors are provided on leading wheel set for both sections 49) If emergency brakes applied at speed of above 3 KMPH BP 0, CB trips, Panto Lowers and Loco Stops, AFL comes 50) Max Tractive and Braking Effort is. 706 KN/S14KN 51) If one TCU is isolated Max TE will come 529 KN 52) If PB is applied gauge shows,0 kg/cm? when SA9 Released and when SA9 applied 3.8 kg/em? released gauge shows 5.6 kg/cm? 53) In Dead loco PB gauge shows 4.8 ke/em? 54) TBC by pass switch provided in CCR panel 55) Flaps can be operated by Manually and Automatically 56) If both white and red marker lights are switched on same section RED MARKER lights will glow. 57) In WAGI2B, loco shall not move up to 157. KN. 58) To stop dehumidifier open CB 100_MCB after deenergising WAG12B loco. 58) Max. permissible speed of WAGI2B is_100_ KMPH at axle load of 22.5T. 59) ZPT positions are RAISE, NONE, LOWER, EMERGENCY . 60) If throttle is not responding operate TBC Bypass. switch. 61) When MCB 100 is ON, machine room lights work for 15 minutes. 62) Location of battery voltmeter is LB CUBICLE / TLB PANEL . 63) To operate HOM KABA. key to be used. : 64) If HHT is closed in advance, position VCB_will not close. 65) Minimum battery voltage required to energise WAGI2B loco is 92.V.. 66)13. no of 3ph auxiliary motors are provided in each section of WAG12B. 67) Panto selector switch positions are Front, Rear and Both in WAG12B. 68) To overcome 3KMPH trouble in WAG12B 0 Speed Bypass Switch is to be operated. 69) Bogie can be isolated through DDU in WAG12B. 70) CSC can be activated from__5___ KMPH in WAG12B. Page 3 of 1471) Regenerative braking shall be used above 10 KMPH in WAG12B. 72)In WAGI2B, parking brakes can be applied below _§_ KMPH. 73)In WAGI28, if panto selector switch is in “emergency” in rear cab Panto will not Raise happens. 74) Purpose of E-block blower is To Cool E Block water coolant and TFP Oil. 75) Location of E-block blower? is Beside E Block 2. 76) When BPEMS is pressed in WAG12B, BP 0, TE/BE 0, VCB Open, Panto Lowers, AFL Glows, Train Stops actions takes place. 77) When MR pressure drops below 6.5 kg/cm?, both compressors start working. 78) When MR pressure drops below 5.5 kg/cm? tractive effort becomes 0. 79) In WAG)2 , in place of rail guard Stone Deflector is provided. 80) When BA voltage drops below 89 V volts 1* alarm bell comes on DDU. 81) Dehumidifier is provided to control humidity of MR when loco is shut down. 82)E-block | gives supply to TM 3 & TM 4 and Ai 83) Parking brakes are provided to 2, 5, 7 & 11 wheels in WAG12B. 84) BPCS cannot be used during Regenerative braking in WAG12B. 85) MASCON key shall be operated within 10 Min, after operating battery connect switch. 86) In any cab if panto switch is kept in emergency, Both Pantos will lower happens in WAGI2B. 87) CSC mode will not work in reverse direction of WAG12B. 88) VCD starts functioning above 5 KMPH in WAG12B. 89) If DDU fails reset 72021 MCB and Location LV Cubicle. Page 4 of 14WAG 12B QUESTION BANK with ANSWERS 1) Draw the Layout of WAG 12B Machine Room Layout and name the parts in a correct sequence. 2) Write IMP cocks provided in Brake Control Module. BCM and explain them in one sentence. 3) Name the different types of brakes provided in WAG12B Loco and write the EB reset procedure. Ans: Types of Brakes a. Regenerative Brake Regenerative braking starts above 10Kmph and cuts off at SKmph. Maximum Regenerative effort is available between 10Kmph and 60Kmph. No. of Healthy Regenerative Braking Effort Bogies 22.5 Axle Load 25T Axle Load 4 S14KN 363KN 3 385KN 422KN Types of Pneumatic Brakes - i, Auto Brake- Applies brake in complete trainline. ii. Direct Brake- Applies Brake only on Locomotive. . Emergency Brake- Applies Brake in complete trainline, -. Back Up Brake- Applies brake in complete trainline. v. Parking Brake- Parking Brake in Locomotive only 4) Write WAGI2B Energization Procedure in a correct sequence. Ans: Locomotive Energisation Procedure i. Operate Battery Isolation CB (CB.100) to normal position in both sections. - Check Battery Voltage on Voltmeter at LV Cubicle. iii, Move battery connect switch to Start-up position. “ \ * eter eae W ue Page S of 14w WA ent OR iv. Tum, Key Switch (BL Kéy) to ON Position in Master Controller. v. Move Pantograph toggle switch to raise position. ; Check the line voltage value is within range from Line Indicator located on Driver Desk. Close the VCB a eth * we Put EBV Mode selector to “LEAD" position. oo . Place Direct Brake Handle (SA9) at FULL position. ue x. To release penalty brake, place the EBV Auto Brake Handle (A9) at FS position for ™ minimum 10 seconds. J xi, Once “OKAY TO RUN” message appears on EBV screen, ensure to charge BP up to ye Skg/cm2. Release Parking brakes from Central Panel ask. Select the direction from Reverser (Direction Selector) on Master Controller. “oD What are the precautions to be taken while moving WAGI2 B Loco as DEAD. Wee Ans: sey © Put EBV mode switch in ‘TRL’ position in both sections. © Put Auto handle in both the section should be kept in FS position & secure using lock pin and put Direct brake Handle on REL position. © Locomotive shutdown is in Dead Mode (batteries isolated), © Close (horizontal position) SIFA Cock (N55.05), on Auxiliary Panel of Brake System in both sections © Close (vertical handle position) FP cock (B50.01), on Auxiliary Panel of Brake System in both sections. © Connect BP Hose to another loco or train and Open BP angle cock so that BP can be charged on dead loco. © DER (Dead Engine Regulator) cock at ERCP in Brake Panel shall be operated in ‘IN’ position (rotate anti- clockwise position) in both sections (Rotate anti clockwise to “IN” position written on ERCP) and allow to charge BP & 150 Litre Reservoir through brake pipe air up to 5 kg/em2. © Charge BP to normal level, verify brake are released and BC pressure is zero. If BC is not reducing to zero, then give brief pulls to Quick Release Lever at bottom of distributor valve (KE Valve) Ensure BC reduces to zero. © If loco Brake remains applied, press 20TP (Test point) of 20CP on Pneumatic Panel to Release BC to Zero. © Open one end of DBP & MREP angle cock at one end of dead Loco. Release Parking Brakes by Pressing Plunger (red colour on apply/ release solenoid") on BCM panel of both the sections and ensure pressure on the parking brake gauge is more than 4.8 kg/em2, Release Parking Brakes by Pulling Manual Release Pins on Parking Brake Unit of each axles in both the sections, Ensure Parking brakes are released by looking into the gap between brake shoes and wheel. 6) Write WAG12B cab changing procedure in a correct sequence. Ans: Cab Change Procedure i, Place the EBV handle at FS position and lock with pin, Place the Direct Brake Handle (SA9) at “REL” position. Change EBV mode selector to “TRL” position. Page 6 of 14iv. — Move the VCB open/close switch to Open position, V. Move Pantograph toggle switch to lower position. i. Ensure pantograph is lowered. Tum MASCON Key Switch (BL Key) to OFF Position in Master Controller Panel, Change the Cab within 10 Mins (If other cab is not activated within 10 Mins, Locomotive will enter shutdown mode) ix. Tum, Key Switch (BL Key) to ON Position in Master Controller. Move Pantograph toggle switch to raise position. Check the line voltage value is within range from Line Indicator located on Driver Desk. Close the VCB. Change EBV mode selector to “LEAD” position. Place Direct Brake Handle (SA9) at FULL position. To release penalty brake, place the EBV Auto Brake Handle (A9) at FS position for minimum 10 seconds. xvi, Once “OKAY TO RUN” message appears on EBV screen, ensure to charge BP up to Skg/em2 xvii, Select the direction from Direction Selector (Reverser) on Master Controller. 7) Write WAG12B Backup brake PTDC procedure and precautions. Ans: ‘The following sequence will be applied to switch over from normal brake to back-up brake: a) Trip the Circuit breakers 62Q06 (present in LVC) of BCM in both the sections. b) Operate the PER-COS cock present in BCM of active section to Cut - in position (horizontal). c) Ensure Back-Up Brake handle in Position ‘IIT’ (lap position). d) Ensure VCD bypass switch is in normal position. e) Charge Brake Pipe pressure by moving the Back-Up Brake handle to position IVRELEASE in active cab. f) BC pressure will reduce to zero, If not, briefly pull the quick release lever at the bottom of the ‘KE’ (Distributor) Valve present in BCM panel. Thereafter Loco Pilot can operate with back-up brake. g) Still Emergency Brake can be applied with Auto Brake Handle(A9) handle. Precautions: During Backup-Brake operation, moving handle slightly in between position III and Position V, BP drops in same ratio and brakes will applied accordingly. Moving handle completely to Position V leads to emergency brake application. 8) Write items provided in a Central Panel and explain in one sentence. 1 Emergency Push Button: This button is used to apply emergency brake. 2 Compressor Force Switch: This switch is used to forcefully start the main compressors. Page 7 of 14» 3 Constant Sead Push Button: Used to activate constant ‘speed mide. 4 Vigilance ‘ACK/Rest Push Button: Can be used to Acknowledge the vigilance and to Reset the vigilance penalty brake. 5 Flasher Light Push Button: Used to manually switch onlorr the flasher light. 6 Fire Alarm Push Button: Used to reset the fire alarm. 7 MIC: Used to record voice in driving cab. 8 ZTEL; Tractive Effort Limit Switch 9 Speed Freeze Button: Used to freeze the recorded speed to the current value when required (accident). The value is written in EVR and overwriting is prevented. 10 Speedometer: Used to display the speed of Locomotive. Write Different Panels provided on WAG12B Loco Pilot desk Ans: a) Left Panel b) Brake Gauges Panel c) Indication Panel d) TLB Indication Panel e) Central Panel f) Master Controller g) TCMS/DDU h) Right side shelf i) Left side shelf 10) Write items provided in CCR and their position, write about them in one sentence. Ans: a Fire detection bypass This switch is used to bypass fire a switch(sealed) ‘switch with the following positions: _- i : Normal (stable) Bypass (stable) alarm, This is a two-position CCR Lighting Push This push button is used to switch ON temporized lighting, when Button locomotive is in shutdown for cab and machine room. Lights are kept ON for 15 min. Page 8 of 14R machi This switch is used to locally (section) switch ON machine F ae lighting room/gangway lights as normal lighting. fr swi Panto selector switch This switch is used to manually select the rear, front or both the pantographs. This switch has following positions. f Rear (stable) Front (stable) Both panto (stable) 5 Battery connect switch This switch has following positions: (S.BAC) fend Stop (unstable): To shutdown Control Electronics Normal (stable) Start up (unstable): To activate Control Electronics —-+ This switch is used to bypass the zero speed related interactions. This 6 Zero speed bypass is a two-position switch with the following positions: i switch (sealed) favs? Include (stable) Bypass (stable) ; This switch is used to inhibit the vigilance device. This switch has following positions: ie Normal (stable) Isolated (stable) Traction/Brake " “fontrolier bypass and to enable to use the soft traction/ brake controller on DD! | Switch\sealed) ‘ ' Normal (stable) Bypass (stable) j | Fire Extinguishing Override Switch To be used to activate 45kg Fire Extinguishing in the Machine Room. i ji t 10 50 220Vswitch/socket This switch/socket is powered with 230v AC supply. 11) Write WAG12B grounding procedure in sequence. Ans: a) Open the VCB by using the VCB open/close toggle switch. b) Lowered the Pantograph by using the Pantograph toggle switch. (Physically verify that pantograph is lowered) ) Isolate Pantograph Cut-out Cock available on PCU in machine room. This process Releases the pressure available in pantograph pipe (In Both Sec.) 4) Ensure Workshop/Shore supply CB in off position (In both Section) Page 9 of 14¢) Operate the Z-SEC key to “HV disconnection” position. Release the Z-SEC key by rotating Clockwise. Z-SEC key is attached by a welded ring with the H(O-M) input key (Blue Key-KABA) and with workshop plug box key (used for the workshop plug function). f) Insert the Blue KABA key inside the input barrel, rotate the key and turn the input barrel. 8) Rotate the H(O-M) in grounding position through the switch gear handle. h) When the switch gear handle of H(O-M) is in grounding position, turn the output barrel clockwise direction and the output key (green) handle linked with the H(O-M) 12) Trouble Shooting for a) B/S HL’s not glowing Ans: 1. Try to operate Headlight from DDU. 2. If Head light is not glowing, Inform to OCC Flasher Light not glowing Ans: a) Verify that the Flasher Control is in ON position and Mode selector toggle switch in Main or Standby. Press Flasher Light push button located in Driver Desk and check Flasher Light is working or not. Ifit is not working proceed to the next step. €) Switch the mode to (STANDBY/MAIN) .Still It is not working proceed to the next step. ) Try to activate the flasher light using DDU .{fit is not working perform the next step. e) Put the fuse in MAIN/STANDBY by taking from SPARE fuse and check the operation by following above steps . f) Flasher light still does not work Complete failure of the flasher control unit. No controls will work. 13) What are the important equipment to be checked in WAG12B Loco under gear Ans: a) Cattle Guard b) Stone Deflector c) Traction Motor d) Gear Box e) Main Transformer f) Heat Exchange g) MTR Pump h) Traction Bar i) Bogie Frame j) Battery Box k) MCB 100 1) Primary Suspension m) Vertical Dampers n) Horizontal Dampers 0) Secondary Suspension p) Top Stopper q) Bottom Stopper 1) Shore WSSU b) b) Page 10 of 1414) Write 3 Phase & 1 Phase Auxiliaries in WAG12B loco for one section. Ans: ‘S.No Description Quantity Per Section Load 1 E-Block Blower 2(1 in each E-Block) 14.8 kw, 2 E-Block water pumps 2(1 in each E-Block) 3.05 kw 3 ‘Traction Motor Blower 2 14.05 kw_ 4 Machine Room Blower 2 4.93 kw 5 Punction Blower 2 1.35kw 6 MASU_ 1 34 kw 7 HVAC 1 4.13 kw 8 230v Socket 1 SA 9 Battery Charger 1 14 kw 10 | _ Main Transformer Oil Pump 2 3.5 kw u Crew Fans 2 15) Write about vigilance management system in WAGI2B loco. Ans: a) Vigilance control is operative in all driving modes except inching mode, itis also operative for locomotive speeds beyond 5 km/h. b) The logic of vigilance is different for driving modes and logic is explained below: c) Loco pilot must perform any of the following actions every 60 seconds (acknowledgement): i, Movement of master controller handle (displacement of more than 5 degree Movement of auto brake handle iii, Tap vigilance pedal switch iv. Press the VCD Ack/Reset push button If none of the above actions are performed for 60 seconds, an alarm is triggered and vigilance warning indication lamp is lit on indication panel along with buzzer. To reset, Loco Pilot must press and release the vigilance foot pedal. If alarm is not reset within 16 seconds, then penalty brake is initiated. To reset vigilance function, Loco Pilot must: i. Bring traction brake controller handle to “Neutral” Wait for 32 seconds Press “VCD Ack/Reset” push button on central panel. iv. Give VCB close command v. The reset is recorded in event recorder. To reset the penalty brake, move auto brake handle to Full Service (FS) position for 10 seconds and then to RUN position. Indication is provided when vigilance alarm is active. a. Visual alarm on Indication Panel b. Audio alarm through Buzzer Alarm 16) What are the equipment available in the MASU and Ventilation Block. Ans: (Main Air Supply Unit) Air filtration and inlet arrangement Main compressor with filtration system . Air Dryer iv. Main Reservoir v. Auxiliary compressor 17) How will you conduct Loco Brake Power Test in WAG12B. Page 11 of 1418) What will be the operation effect when, a) one E-block blower fails and b) one TM blower fails? 19) No. of suspensions provided in each Section/Loco. Ans: Primary suspension for one bogie i) Each axle box : 2 Helical springs. ii) One vertical damper iii) Vertical bottom stop iv) Vertical top stop v) Guide rods : 2 upper and lower Secondary Suspension : i) Helical Springs ii) Vertical damper iii) Lateral dampers : 1 Each section Bogie : i) Helical springs : 12 ii) Dampers : 07 Each Loco: i) Helical springs : 48 ii) Dampers : 28 20) How will you trouble shoot if MR Not Building UP. Ans: a) Check the Compressor is running or not. b) Check the leakage from Auto drain valve under Main Reservoir, if yes put the auto drain valve (B60.01) in closed position of respective section. ©) Check Drain cock (A-10, Under MR) of both sections is in Open/Close position, if found Open, then Close it. 4) Check the Drain Cocks (A11/1,A11/2,A11/3) located in BCM of both sections. Ifany of them are in open position, then close it. ©) Check the leakage from MASU (i.e. safety valve, air dryer etc.) if there is leakage then Cut ‘out the MASU Isolation cock (A13) of the respective section. f) Check the leakage from MREP, DBP & FP angle cocks. 8) Check the leakages in load side. 21) How will you trouble shoot if VCB not closing after Neutral Section Ans: a) Check the OHE voltage from Line Indicator/DDU. If available Ensure the throttle position in Neutral else proceed to the next step. b) Check the Panto status from DDU. If Panto is down, stop the Loco. ©) Raise the panto 4d) Wait for voltage indication in Line Indicator/DDU & Close the VCB. ©) Still VCB not closing change the panto selector switch to other section and wait for voltage indication in Line Indicator/DDU. f) Close the VCB Page 12 of 1422) How will you troubleshoot if BP not charging. Ans; 4) Check that EBV Auto Handle is in RUN position, and EB push Button is in released condition, and ALP Emergency cock should be closed position. Put auto brake handle on FS with lock, direct brake handle on REL and Put selector switch on TRAIL in non-active cab. ©) Put selector switch on LEAD in active cab. d) Ensure MR Pressure on gauge is > 8kg/em2 . ©) Check the Display of EBV if it is showing target pressure “0,00 kg/em2 ” or “xxx”, then check the leakage in BP line, otherwise follow the displayed instruction. f) Ensure the no leakage from Assistant driver emergency cock and cock is fully closed in both section (by hearing sound). Close the BP angle cocks (front and intersection) of the locomotive and charge BP by placing auto brake handle in RUN position. Check the leakage from 821 vent valve (N98, underframe) if yes, close the SIFA emergency cock (N55.05) on BCM of respective section. i) Check for no leakage from both the BCMs. 4) If leakage is arrested by closing the cock, then charge BP by following the EBV display instruction (follow the EB reset instruction). k) Open the BP angle cock (intersection) to supply BP to formation slowly. 1) After opening the cock if again BP is dropping check the formation leakage. b) 8) h) 23) How will you trouble shoot if Master Controller (Mechanical) Fails. Ans: Throttle failure: a) Remove the sealing of TBC bypass switch and Put the switch to Bypass. b) Use the virtual TBC on DDU for throttle operation. Key switch failure: a) Loco can only be run from other section. b) [fnot possible, PRT intervention needed. Direction Selector Switch Failure. a) Loco can only be run from other section. b) Ifnot possible, PRT intervention needed. 24) How will you troubleshoot if TBC (Throttle) not Responding. Ans: a) Put the throttle at Neutral. b) Put the Direction switch in OFF position then put in FWD/REV as per requirement then put throttle to Traction if still it is not responding proceed to next step. c) Remove the sealing of TBC bypass switch and Tum the switch to Bypass. d) Use the virtual Master controller on DDU for throttle operation. 25) How will you troubleshoot if Panto Not raising. Ans: Ensure that ZSEC is not in HV disconnection Position in both cabins, Ensure that not CB on LV cubical of both sections is in tripped condition. Ensure that pantograph switch in other section is not in “EMERGENCY” position, Page 13 of 14weiselg node] q@ TT OVA