AC EMU

AUXILIARY CIRCUIT

N.D.Turkar/PL/IRIEEN/NK
 Auxiliaries
• Oil pump (OP)
• Radiator fans(two) (KFl,KF2)
• Main rectifier fan (RF)
• Battery charger
• Auxiliary compressor
• Main compressor
• Passenger lights
• Passenger fans
 AUXILIARY CIRCUITS

There are two separate auxiliary circuits,

I. 266V AC
II. 141V AC
AUXILIARY I CIRCUIT
6
7
 266V A.C. AUXILIARY CIRCUIT
• This circuit is fed from Auxiliary winding on
the main transformer Aux. I and gives a
nominal 266V AC Output.
• It is used to feed the battery charger and the
single phase induction motors driven auxiliary
machines.
• These machines are capacitor start and run
single phase induction motors.
 266V A.C. AUXILIARY CIRCUIT
Auxiliaries are:
1. Oil pump (OP)
2. Radiator fans(two) (KF1,KF2)
3. Main rectifier fan (RF)
4. Battery charger
 266V A.C. AUXILIARY CIRCUIT
• No-Volt Relay (NVR)
• This is a DC relay fed by a bridge rectifier, and
is used to detect whether the transformer is
‘live or not.
• The NVR circuit is protected by a miniature
circuit breaker.
• On failure of OHE voltage, NVR drops out and
disconnects the traction circuit by means of
its Interlocks in the control circuit
 Oil Pump
• It is provided to circulate the transformer oil
to keep it cool & the entire unit is mounted in
transformer oil pipe line.
• The motor is of 4 pole, squirrel
cage(induction motor), capacitor start & run
type and operates with its rotor immersed in
oil.
• Rating: 1.5 HP, 240V AC, 50 Hz, 6.5 A, Single
phase, 1420 RPM.
• Pump capacity: 364 lpm against 7.32m head.
 Radiator Fans

• These are provided for air forced cooling of

transformer oil and are fed by auxiliary I
circuit of transformer.
• Rating: 0.5 HP, 240 V AC, 50Hz, single phase,
2.5A, 1410 rpm.
 Rectifier cooling fan
• It is provided to cool the heat sinks of
rectifier diodes and is fed by auxiliary-I circuit
of transformer.
• Rating: 1HP, 240V, AC, single phase, 3.6A,
1430 rpm.
AUXILIARY II CIRCUIT
 141V A.C. CIRCUIT
• This circuit is fed from a secondary winding
Aux. II (141V AC) and is protected by two
fuses AF3 and AF4, located inside the
transformer connection chamber.
• A rectifier-fed relay LTR is provided to prove
that fuses AF3 and AF4 are intact and the
auxiliary supply rectifier (ASR)is working
normal.
 141V AC CIRCUIT
• The circuit of LTR is protected by a miniature
circuit breaker.
• A surge suppression capacitor with a series
resistor is provided across the input to ASR.
 141V AC CIRCUIT
Auxiliaries are
• Main compressor
• 110V DC, 8.5KW, 1150rpm, 1075lpm
• Passenger lights and fans
• Fans: 32 fans of 60W each coach
• Lights
• 16 normal lights of 18W each coach
• 12 emergency lights of 18W in each coach
Load distribution in Trailer coach
 MAIN-COMPRESSOR MOTOR

• The main compressor motor is protected by

fuse AF10 and a permanent series resistor,
and its contactor CC1 which is in turn
controlled by a compressor set and trip relay
(CR) through the compressor governor.
 MAIN-COMPRESSOR MOTOR
• When the Compressor set button in any
driving cab is pressed, train line 12 is
energized, sets all the compressor relays in
the train and the contact CR/1 completes the
respective compressor contactor coil (CC 1)
circuit. This closes the compressor contactor.
 MAIN-COMPRESSOR MOTOR
• To switch off the compressor, the compressor
trip button in the BL box is pressed, this
energizes train line 42, trips the compressor
relay (CR) and the compressor
contactor(CC1).
• A sealed switch GS3 is provided to short
circuit the main-compressor governor if it
sticks in the open position.
 MAIN-COMPRESSOR MOTOR

• Compressor synchronizing is achieved

through train line wire 13.
 ABB RED LAMP
• The lamp glows indicate that ABB in
one/more unit is in tripped condition.
Parking brake applied
Aux. rectifier Trip-RED
 EP supply on relay
• It gives the indication that brake valve is
charged & EP brake supply is ‘ON’.
 RECTIFIER FUSE BLOWN
• The lamp is provided to give an indication for
failure of any one of the rectifier bridges.
Normally it remains in extinguished condition.
 CHBA FAILURE INDICATION
• This lamp is provided to give an indication for
failure of Battery charger.
• It remains in extinguished condition if the
Battery charger is in healthy condition.
 AUXILIARY WHITE LIGHT
• It is provided to give an indication for no OHE
voltage. LTR does not pick up or there is no
ASR output, provided ABB is closed. For
normal working, it remains in extinguished
condition.
Battery Isolating switch
Governor bypass switches
Reverser
Brake Controller
EP Unit
JUMPERS

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 ‘A’ JUMPER
CABLE NO CIRCUIT WIRE NO CIRCUIT DESCRIPTION

101 14A CONTROL POSITIVE

102 14A CONTROL POSITIVE
103 14A CONTROL POSITIVE
104 9 ABB CLOSE
105 44 AC FAN’S-I
106 45 AC FAN’S –II
107 10 ABB TRIP
108 12 MAIN COMPRESSOR SET
109 42 MAIN COMPRESSOR TRIP
110 1452 AUDIO VISUAL CIRCUIT
111 7 PANTOGRAPH RAISE
112 40 BRAKE CIRCUIT RETURN
113 8 PANTOGRAPH LOWER
114 36 BRAKE CIRCUIT POSITIVE
115 37 EP HOLDING
116 38 EP APPLICATION
117 3904 AUDIO VISUAL CIRCUIT
118 39 BRAKE END CIRCUIT
119 40 BRAKE CIRCUIT RETURN

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 B-JUMPER (BLUE JUMPER)
CABLE NO CIRCUIT WIRE NO CIRCUIT DESCRIPTION

201 5 FORWARD
202 6 REVERSE
203 1 NOTCH –1
204 2 NOTCH-2
205 3 NOTCH-3
206 SP SPARE
207 1424A OVR SYNCHRONISING
208 A261 NLVS INPUT
209 A266 NLVS INPUT
210 A266 NLVS INPUT
211 33 HL, HC, TL EMERGENCY
212 46 AC FAN’S RETURN
213 46 AC FAN’S RETURN
214 11 ALL OVER LOAD RESET
215 A261 NLVS INPUT
216 13 MCP SYNCHRONIZING
217 SP SPARE
218 SP SPARE
219 14A CONTROL CHANGE OVER FEED

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 C-JUMPER
CABLE NO CIRCUIT WIRE NO CIRCUIT DESCRIPTION

301 16 ABB OPEN INDICATOR

302 19 RECTIFIER –FUSE BLOWN INDICATOR
303 18 TRACTION MOTOR OL - INDICATOR
304 17 110V DC SUPPLY INDICATOR
305 15 SUPPLY FOR INDICATION LIGHT
306 17A BATTERY CHARGER FAILURE INDICATOR
307 A261 NLVS INPUT
308 A261 NLVS INPUT
309 226 NLVS INPUT
310 226 NLVS INPUT
311 14 WARNING
312 SP SPARE
313 31 EMERGENCY POSITIVE FOR LIGHT
314 31 EMERGENCY POSITIVE FOR LIGHT
315 25 ALARM BELL
316 26 SIGNAL BELL
317 14A CONTROL CHANGE OVER FEED
318 14A CONTROL CHANGE OVER FEED
319 20 GUARD’S SUPPLY
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 D-JUMPER
CABLE NO CIRCUIT WIRE NO CIRCUIT DESCRIPTION

401 A226 NLVS INPUT

402 A226 NLVS INPUT
403 44 AC- FANS I
404 45 AC-FANS II
405 21 LIGHT’S ON
406 SP SPARE
407 22 LIGHT’S OFF
408 23 FAN’S ON
409 24 FAN’S OFF
410 20 GUARD’S KEY SUPPLY
411 41 DC SUPPLY NEGATIVE
412 41 DC SUPPLY NEGATIVE
413 A261 NLVS INPUT
414 A261 NLVS INPUT
415 46 AC FAN’S RETURN
416 41 DC SUPPLY NEGATIVE
417 41 DC SUPPLY NEGATIVE
418 32 HLVS INPUT
419 32A HLVS INPUT
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