3. Basic Knowledge of ‘EMU’
An EMU consists of 4 or 5 units.
A unit comprises of 3 coaches.
So there are 12 and 15 coaches EMU
running in Mumbai.
The vehicle is equipped with a state-
of-the-art three-phase drive with
asynchronous Motor
Types.
4. There are two types of Basic
Unit:
End Basic Unit
Middle Basic Unit
5. End Basic Unit
Motor Coach (MC)
Driving Trailer
Coach (DTC)
Trailer Coach
(TC)
6. Middle Basic Unit
Motor Coach (MC)
Non-Driving
Trailer Coach
(NDTC)
Trailer Coach
(TC)
8. Control Technology
There are two Central Control Units
(CCU).
The Units are connected to each other via
an MVB Bus.
If the MVB bus is not available despite of
this fallback, the vehicle can be operated
in degraded operation via the rescue drive
mode.
All the switches , buttons and devices are
connected to a KLIP station
9. Diagnostic Display Support
The MMI (Man-Machine Interface) is
installed in the driver's cab in the DTC.
The states of functions are indicated to
the driver by means of coloured icons.
Automatic vigilance device has been
implemented via the master controller.
In rescue drive mode, the automatic
application of the brakes is immediately
initiated.
11. Types of Pantograph :
Diamond Shape – For DC rakes.
Bow Type – For AC/DC rakes.
There are two types of Bow used :
A. Schunk metal & carbon India ltd - used in
Siemens rake only.
B. Stone India ltd - used in Siemens rake &
BHEL rakes
13. The Pantograph has three articulations :
1.Lower Articulation 2.Middle Articulation
3.Upper Articulation
1. LOWER ARTICULATION
It contains :
Base Frame
Main Springs
Lower Arm
Yoke Assembly
Push rod Assembly
25. Operation
In it’s lowered position the main
Springs are extended by pulling the
lower arm rotation by servomotor
and its insulator mechanism
assembly. When its tension is
released the pantograph raises.
26. Raising :
When the compressed air is admitted into the air motor
cylinder
The cylinder piston compresses the holding down spring
inside the air motor
It displaces the slotted bar then permits the rotation of
the horizontal spindle of the lower arm under the action
of the working springs.
Thus the pantograph raises until collector head reaches
the overhead wire.
The pantograph balance is maintained through the
working of the main springs
slotted bar insulator
MECHANICAL ASSEMBLY
HOLDING DOWN SPRING
air motor cylinder
Piston rod
27. Lowering :
Releasing the compressed air in the
cylinder causes the piston to return under
the action of the holding springs.
The slotted link pulls the horizontal
spindle and lowers the pantograph.
Air pressure required for complete
extension of the piston rod will be 5
kg/cm2.
Graphite grease is applied on the pan for
smooth operation
28. Static Adjustment :
The static load of the pantograph is the
load applied by the pantograph on the
contact wire. The load must be as
constant as possible through out the
entire contact range 0.5 to 2.0m of the
pantograph. It is adjusted by four static
screws.
1.5m 1.0m
1.75m 0.5m
29. Transverse flexibility of the
pantograph :
Raise the pantograph to a height of
1.5m
Pull the upper articulation
transversely with a force of 50 kg
weight suspended on a rope
passing over a pulley.
The displacement of the bow should
be 36 mm + 5mm.
30. Datas :
Width of the pan : 1800/2032 + 10 mm
Weight of the panto without insulators : 230kg
Current collector strip material : Electrolyte copper
Nominal Voltage : 25 KV AC/1500 V DC
Nominal Current : 60/1100Amps
Raising time/Lowering time : 5 Sec.
Thickness of copper strip : 6.35mm
No. Of strips per pan : 8 Nos.
Condemned size normal : 3 mm
Monsoon : 4mm
Maximum Height on release position : 2490 m
SIL PANTOGRAPH BEARING
YOKE ASSEMBLBAY : 06 nos.
UPPER ARTICULATION : 02 nos
LOWER ARTICULATION : 02 nos
PUSHROD ASSEMBLY : 02 nos
MIDDLE ARTICULATION : 02 nos
TOTAL NO. OF BEARING : 14nos
45. Datas :
Width of the pan : 2032 + 10 mm
Total Weight of the panto with insulators : 150kg(appx.)
Current collector strip material : Electrolyte Cu.
Nominal Voltage : 25 KV AC/1500 V DC
Nominal Current : 60/1100Amps
Raising time/Lowering time : 10 Sec.
Thickness of copper strip : 6.35mm
No. Of strips per pan : 07Nos.
Condemned size normal : 3 mm
Monsoon : 4mm
Total length in resting position : 2370 mm. +10 mm.
Maximum extension position : 2400 +10 mm.
Minimum height with insulator : 575 +10 mm.
Frame insulators : 25 KV ,4nos.
Insulator Height : 363 mm.
Maximum speed under healthy OHE wire : 160 KMPH
Air pressure for continuous operation : 7 bar