Man B&W S50MC-C8-TII User Manual

MAN B&W 4.01
Page 5 of 6
MAN Diesel
198 43 000.2MAN B&W K98MC/MC-C/ME/ME-C, S90MC-C/ME-C,
K90MC-C/ME/ME-C, S80MC/MC-C/ME-C, K80MC-C/ME-C,
S70MC/MCC/ME-C/ME-GI, L70MCC/ME-C, S65ME-C/ME-GI,
S60MC/MC-C/ME-C/ME-GI/ME-B, L60MC-C/ME-C,
S50MC/MC-C/ME-C/ME-B
The power from the crankshaft gear is trans-
ferred, via a multidisc clutch, to an epicyclic
variableratio gear and the generator. These are
mounted on a common bedplate, bolted to brack-
ets integrated with the engine bedplate.
The BWIII/RCF unit is an epicyclic gear with a
hydrostatic superposition drive. The hydrostatic
input drives the annulus of the epicyclic gear in
either direction of rotation, hence continuously
varying the gearing ratio to keep the genera-
tor speed constant throughout an engine speed
variation of 30%. In the standard layout, this is
between 100% and 70% of the engine speed at
specified MCR, but it can be placed in a lower
range if required.
The input power to the gear is divided into two
paths – one mechanical and the other hydrostatic
– and the epicyclic differential combines the
power of the two paths and transmits the com-
bined power to the output shaft, connected to the
generator. The gear is equipped with a hydrostatic
motor driven by a pump, and controlled by an
electronic control unit. This keeps the generator
speed constant during single running as well as
when running in parallel with other generators.
The multidisc clutch, integrated into the gear in-
put shaft, permits the engaging and disengaging
of the epicyclic gear, and thus the generator, from
the main engine during operation.
An electronic control system with a RENK control-
ler ensures that the control signals to the main
electrical switchboard are identical to those for
the normal auxiliary generator sets. This applies
to ships with automatic synchronising and load
sharing, as well as to ships with manual switch-
board operation.
Internal control circuits and interlocking functions
between the epicyclic gear and the electronic
control box provide automatic control of the func-
tions necessary for the reliable operation and
protection of the BWIII/RCF unit. If any monitored
value exceeds the normal operation limits, a warn-
ing or an alarm is given depending upon the ori-
gin, severity and the extent of deviation from the
permissible values. The cause of a warning or an
alarm is shown on a digital display.
Extent of delivery for BWIII/RCF units
The delivery comprises a complete unit ready to
be builton to the main engine. Fig. 4.02.01 shows
the required space and the standard electrical
output range on the generator terminals.
Standard sizes of the crankshaft gears and the
RCF units are designed for:
700, 1200, 1800 and 2600 kW, while the generator
sizes of make A. van Kaick are:
Type
DSG
440 V
1800
kVA
60 Hz
r/min
kW
380 V
1500
kVA
50 Hz
r/min
kW
62 M24 707 566 627 501
62 L14 855 684 761 609
62 L24 1,056 845 940 752
74 M14 1,271 1,017 1,137 909
74 M24 1,432 1,146 1,280 1,024
74 L14 1,651 1,321 1,468 1,174
74 L24 1,924 1,539 1,709 1,368
86 K14 1,942 1,554 1,844 1,475
86 M14 2,345 1,876 2,148 1,718
86 L24 2,792 2,234 2,542 2,033
99 K14 3,222 2,578 2,989 2,391
In the event that a larger generator is required,
please contact MAN Diesel.
If a main engine speed other than the nominal is
required as a basis for the PTO operation, it must
be taken into consideration when determining the
ratio of the crankshaft gear. However, it has no
influence on the space required for the gears and
the generator.
The PTO can be operated as a motor (PTI) as well
as a generator by making some minor modifica-
tions.
178 34 893.1

Man B&W S50MC-C8-TII Specifications

General

Brand	Man
Model	B&W S50MC-C8-TII
Category	Engine
Language	English