ER9 electric trainset
| ER9 | |
|---|---|
ER9-30 at Murom, Gorkovskaya Railway
|
|
| Manufacturer | Rīgas Vagonbūves Rūpnīca |
| Entered service | 1962- |
| Specifications | |
| Electric system(s) | 25 kV 50 Hz AC Catenary |
| Current collection method | Pantograph |
| Coupling system | SA3 |
| Track gauge |
1,520 mm (4 ft 11 27⁄32 in) Russian gauge 1,435 mm (4 ft 8 1⁄2 in) standard gauge Bulgarian State Railways |
For servicing suburban commuter lines, electrified on 25 kV, AC, the Railcar Manufacturing Plant of Riga produced ER9, then ER9p electric trainsets in the 1966-1975 period. The mass production of these trains had begun in 1964.
Three types of cars were manufactured for these trains, which were motor, trailer, and cab-trailer. The minimal quantity of cars is four (2 motor & 2 cab-trailer cars). The maximal quantity was twelve (6 motor cars, 4 trailers, and 2 cab-trailers.) The trains could be controlled and/or operated only from cab cars.
The railcar bodies utilise a frameless construction similar to the ER2 series trainsets, with a number of modifications due to the different equipment arrangement, such as AC transformers and rectifiers. The car entrances are fitted for both high and low platforms. Like most Soviet rollingstock, the cars have SA-3 automatic couplers.
The bodies are supported by two twin-axle bogies. The bogie frames are of a H-shaped fully welded construction. Trainsets constructed up to ER9p-125 have N. E. Galakhov's elliptical amortizers in their central suspensions. Bogie frames are supported by 8 cylindrical springs installed in a coat of axle box balancers. The static deformation of amortizer is 105 mm. Starting with ER9p-126 trainset (1966), the trolleys are supported on axles box through four sets of cylindrical springs, placed in two rows. The hydraulic amortizers are placed in the central suspension, like the ER2 motor cars dating from 1966-1975. The static deformation remained the same (105 mm). The diameter of motor car wheels is 1050 mm, and of trailer car wheels is 950 mm.
Electric traction engines are installed on bogie frames, as in ER2 motor cars. The engine's shaft is connected with the minor gear train using a jaw clutch. The speed reduction couple's body is anchored on a pair of wheels through friction reducer made of rolls. From the side of minor gear train, the speed reduction couple is suspended from the trolley's frame.
Unit: Electric Traction Engine (RT-51D) Installed: On motor cars Voltage: 825 V, directly from rectifiers. Power: 180 kW, 240 A (in case of 92.5% excitement) 200 kW, 266 A (in case of 32% excitement)
Rotational frequency: 645 rpm (in case of 92.5% excitement) 1140 rpm (in case of 32% excitement)
In case of pulse current, and 32% excitement the hourly power is 182 kW. The rotational frequency 2080 rpm.
Mass of Unit: 2000 kg The motors are connected in series of two. These series are connected in parallel, and connected to the rectifier through general smoothing reactor. Besides high (92%) and low (32.5%) excitement levels, there is a medium level (53.5%)
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