721-4000series
-0 subseries
-2100 subseries
-3000 subseries
-3100 subseries
-4000 subseries
-5000 subseries
Type
index
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JR Hokkaido developed 721-1000 series and built from 1993. They differ
from the former 721-0 series in adopting AVAF inverter traction systems.
End motored cars were displaced with end trailer cars because of featuring
high power ac 3-phase asynchronous traction motors, N-MT785A, rated at
215kW. Bogies were changed into N-DT721A and N-TR721A. Their bogies differ
from those of 721-0 series in featuring the axle arm journal box supporting
system and having yaw dampers to ensure smooth ride characteristics, giving
a maximum services speed of 120km/h.
Brake registers are fitted on the roof because of adopting rheostatic brake such as 721-0 series.
Most of formations except the 1009F formation were increased to 6 cars
from 2003 with the addition of extra type Saha721-4100 and Sha721-4200
intermediate trailer vehicles. 721-1000 vehicles coupled with Saha721-4100/4200
were classifies into 721-4000 sub-series. Saha721-4100/4200 vehicles differ
from the former 721 vehicles in discontinuing vestibules and having the
air curtains on doorways for preventing open-air coming in. The air conditioner
was changed into N-AU722.
Now 721-4000 series are used on the "Airport" rapid services
linking Otaru/Sapporo and New Chitose Airport. |
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| Technical Data |
| Items |
Data |
| Supply Voltage |
20000VAC,
50Hz |
| Service speed,
etc. |
Acceleration:
2.4km/h/s Deceleration: 4.1km/h/s Service speed: 130km/h |
| Length |
20800mm |
| Width |
2954mm |
| Height |
3670mm |
| Bogie |
N-DT721A (motored) N-TR721A, N-TR721B(trailer) |
| Collector |
N-PS721B |
| Traction
motor |
N-MT785 (215kW) |
| Gear ratio |
5.19 |
| Transformer |
N-TM721B |
| Rectifier |
N-CI721A |
| Traction system |
AVAF inverter: N-CI721A |
| Air conditioner |
N-AU721 (20000kcal/h×1), N-AU731 (30000kcal/h×1) |
| Designed
by |
JR Hokkaido |
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