Background and overview
JR Kyushu developed commuter AC electric multiple unit (EMU) trains, 817-3000
series, to replace superannuated 415 series EMU trains used on Kagoshima
line regional services in Fukuoka. Their train sets were changed into 3
cars and their accommodation was changed into longitudinal bench seating
throughout to provide increased overall capacity and relieve overcrowding.
5 three-car sets consisting of a powered vehicle and a trailer vehicle
were delivered in 2012.
Car body
The double-skinned aluminum alloy construction is incorporated into the
vehicle design. The tempered glass covering the front of the cab section
is changed into corrugated aluminum alloy plate painted in black and their
body is painted in white. Their cab end has a gangway door and an automatic
gangway connection device to ease rush-up operations. Door operating equipments,
TK404K, with flashing alarm lamps while door opening/closing are fitted
above the door header of the sliding doors. A 3000 mm wide and 1000 mm
high large fixed window is fitted between sliding doors. They employed
larger LED destination indicators fitted on the cab end and body side to
improve visibility. The height of side windows below the destination indicator
is smaller than the others. They are equipped with an air conditioner,
AU407KB rated at 42,500kcal/h on their roof.
Bogies
Motored bogies are DT404K and trailer bogies are TR404K, featuring bolster-less secondary air suspension, corn-shaped multilayered rubber spring journal supporting system, and the single link traction device. Conical roller bearings and yaw dampers are adopted to ensure smooth ride characteristics even at 120km/h. Their bogie employing smaller 810mm diameter wheels realizes to lower their floor level. Twin Disc (TD) flexible joint employing deflecting plates made of carbon-fiber reinforced plastic (CFRP) is applied for power transmission device. The gear ratio is 6.53. Both motored and trailer bogies employ the single tread brake device.
Traction unit and ancillary equipments
Their traction system was changed into PC405K featuring truck basis control to keep on moving while the traction system is failed. PC405K consists of a 2-level PWM converter, a pair of 3-level Variable-frequency drive (VFD) employing Insulated Gate Bipolar Transistor (IGBT), and a brake chopper reactor to enable regenerative braking while travelling at dead section and controls 4 asynchronous traction motors, MT401KA, with a power output of 150kW. Powered intermediate vehicles, class moha817-3000, are equipped with a traction transformer, TM409K-H, featuring natural cooling under their floor and a single-arm current pickup, PS401K, on their roof. Arao side trailer end vehicles, class kuha817-3000, are equipped with a motor driven rotary-screw air compressor, MH1092-SC1100K. Moji-ko side trailer end vehicles, class kuha816-3000, are equipped with a high-power ancillary power supply unit, SC405K, employing thyristor/diode hybrid bridge rectifier and IGBT with a power output of 15kVA under their floor. They feature the electric commanding brake with regenerative brake and holding brake, featuring brake control of trailer priority.
Accommodation
Passenger accommodation consists of longitudinal bench seating with two stanchions to divide seating into three-four-three-seater having 440 mm wide per person throughout to provide increased overall capacity and relieve overcrowding. The seat and backrest are made of fire-resistant wood and have cushions covered with fabric. Seats located next to the stanchions have a headrest. LED displays for providing passenger information are fitted in zigzags. Straps were fitted throughout their body. The passenger saloons use LED interior lighting. The ticket machine, which put the ticket indicating the boarding station, is prepared to put beside doorways at the end of their body. The fare LED display and the fare box are also prepared to fit behind the cab. Their cab is a full-size type and the control desk of the driver's cab is equipped with a one handle master controller operated by the left hand. A rubbish bin is fitted beside the doorway.
Additional delivery
6 additional three-car sets were delivered in 2013.
Operations
They entered revenue services on Kagoshima line between Moji-ko and Arao in 2012. They are now used on the rapid and regional services of Kagoshima line between Moji-ko and Arao. |
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