Background and overview
From 2016, a refurbishment programme was commenced on 811-0 series. They
were introduced various changes namely of their traction system featuring
inverter control. In addition, two sets are equipped with the onboard inspection
equipments and classified into -7500 subseries.
Car body
Some changes were introduced to their bodies over 811-0 series. Their side
windows were changed into tinted glass. Destination rollsigns were replaced
with full-colour LED indicators. Refurbished sets retain the unpainted
stainless-steel body with the white painted steel cab end. Their livery
was changed into having blue waistline band with the outline characters,
"Commuter Train 811", running the length of each car below the
windows. "CT" logos also applied to the front gangway door and
aside side doors. They also have a blue "Commuter Train 811"
logo splashed in front as opposed to the older "811 RED EYE"
logo.
Traction unit and ancillary equipments
Their traction motors were changed into power-full 3-phase asynchronous
motors, MT405K, with a power output of 150kW. Their traction system was
replaced with the Variable-frequency drive (VFD) traction system, PC408KA
for class kumoha810 and PC408KB for class moha811, which controls on truck
basis, consisting of a 2-level converter and a 3-level inverter employing
a silicon carbide-based MOSFET. Their traction transformer was updated
to TM411K. The former lozenge-type current pickups were replaced with new
single-arm current pickups. 811-1500 series feature the electric commanding
brake with regenerative brake to zero speed. In addition, end vehicles
are equipped with an image inspection equipment developed by NEC to inspect
track condition. Furthermore, a PM105 train set is equipped with an image
inspection equipment to inspect current feeder condition.
Accommodation
Passenger accommodation is changed into longitudinal bench seating throughout
to provide increased overall capacity and relieve overcrowding on the line,
and LED lighting is used throughout. The fabric of their seating features
the image of traditional textile in Kyushu. A LED display for providing
passenger information displays in zigzags and door chimes are fitted above
the door header of the sliding doors. Straps were fitted throughout their
body. The toilet of class kuha811 is changed into a universal access toilet.
Their end vehicles are also equipped with a wheelchair space.
Operations
811-7500 series are now used on the rapid services and ordinary services
of Kagoshima, Nippo, and Nagasaki lines. |
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