Background and overview
Starting in 2018, the 811-100 series underwent a refurbishment programme,
introducing several changes-most notably a new inverter-controlled traction
system. Following these updates, the trains were reclassified into the
-1600 subseries.
Car body
Several modifications were made to the car bodies compared to the original
811-100 series. Side windows were replaced with tinted glass, and destination
rollsigns were updated to full-colour LED displays. Refurbished sets retain
their unpainted stainless-steel bodywork, with a white-painted steel cab
end. The new livery features a blue waistline band bearing the text "Commuter
Train 811," outlined and running the length of each car below the
windows. "CT" logos are affixed to the front gangway doors and
adjacent side doors. A blue "Commuter Train 811" emblem is also
positioned on the front, replacing the former "NEW RAPID TRAIN 811"
logo.
Traction unit and ancillary equipments
The traction motors were replaced with high-performance three-phase asynchronous
motors (MT405K), each delivering an output of 150 kW. The traction system
was upgraded to a variable-frequency drive (VFD) configuration: PC408KA
for Class Kumoha810 and PC408KB for Class Moha811. These systems implement
truck-based control and comprise a two-level converter and a three-level
inverter utilizing silicon carbide-based MOSFETs. The traction transformer
was updated to type TM411K. The previous lozenge-type pantograph was replaced
with a single-arm pantograph. The 811-1600 series is equipped with an electrically
commanded braking system featuring regenerative braking down to zero speed.
Accommodation
Passenger accommodations were modified to longitudinal bench seating throughout the train to increase overall capacity and alleviate overcrowding along the line. LED lighting is installed throughout the interior. The seat fabric incorporates a design inspired by traditional Kyushu textiles. LED displays for passenger information are arranged in a zigzag configuration above the headers of the sliding doors, accompanied by door chimes. Hand straps are fitted throughout the interior. The toilet in Class Kuha811 was converted into a universal-access facility. End vehicles are equipped with wheelchair spaces, while intermediate vehicles also include wheelchair spaces and are classified under the -2100 subseries.
Operations
811-1600 series are now used on the rapid services and ordinary services
of Kagoshima, Nippo, and Nagasaki lines. |
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