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MAN B&W 8.02
Hydraulic Power Supply Unit
Internally on the engine RU <strong>is</strong> connected to the
Hydraulic Power Supply unit (HPS) which supplies
the hydraulic oil to the Hydraulic Cylinder Units
(HCUs). The HPS unit can be either mounted onto
the engine and engine driven (EoD 4 40 60) or
delivered separately electrically driven, option 4
40 660. See figs. 6.0 .02 and 6.0 .03 respectively.
The hydraulic power supply unit shown in Fig.
8.02.0 , cons<strong>is</strong>ts of:
• an automatic main filter with a redundance filter,
in parallel
• two electrically driven pumps
• three engine driven pumps
• an safety and accumulator block
RW <strong>is</strong> the oil outlet from the automatic backflushing
filter.
At start one of the two electrically driven start�up
pumps <strong>is</strong> activated, and it <strong>is</strong> stopped as soon as
the three engine driven pumps have taken over
the hydraulic oil supply.
The hydraulic oil <strong>is</strong> supplied to the Hydraulic Cylinder
Units (HCU) located at each cylinder, where
it <strong>is</strong> diverted to the electronic Fuel Injection system,
and to the electronic exhaust Valve Activation
(FIVA) sy�stem, which perform the fuel injection
and opens the exhaust valve. The exhaust
valve <strong>is</strong> closed by the conventional ‘air spring’.
The electronic signals to the FIVA valves are given
by the Engine Control System, see Chapter 6,
Engine Control System (ECS).
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The Hydraulic power supply <strong>is</strong> <strong>available</strong>
in 2 versions
The standard version, EoD 4 40 660, <strong>is</strong> the classic
ME power supply where the hydraulic power
<strong>is</strong> generated by engine driven pumps and start up
pressure <strong>is</strong> created by electric driven start pumps.
The capacity of the start up pumps <strong>is</strong> only sufficient
to make the start up pressure. The engine
can not run with the engine driven pumps out of
operation.
The optional version, EoD 4 40 66 <strong>is</strong> similar to
the standard version, but the electric driven start
up pumps have a capacity sufficient to give Take
Home power at least 5% engine power. The
electric power consumption should be taken into
consideration in the specification of the auxilliary
machinery capacity.
MAN B&W ME/ME-C/ME-GI engines 198 42 31-6.1
MAN Diesel