Descripción: Applied Failure Analysis Hydraulic of the Cylinder Seal Failure
proteksiFull description
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Hyd ydraul raulic ic Cyl ylin inder der Uni Unitt (H (HCU)
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Hyd ydrauli raulic c Cylind Cyli nde er Unit Uni t (HC (HCU)
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High pressur e pipes Hydraulic Cylinder Unit
End cover ELFI Valve Fuel Fuel oil pressu re booster Ac c u mu lat o r C linde linderr Lubri Lubrica catio tion n Pressu Pressu re Decay Decay Time and and o ther t rou ble shooting issues
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Hyd ydrauli raulic c Cylind Cyli nde er Unit Uni t (HC (HCU)
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High pressur e pipes Hydraulic Cylinder Unit
End cover ELFI Valve Fuel Fuel oil pressu re booster Ac c u mu lat o r C linde linderr Lubri Lubrica catio tion n Pressu Pressu re Decay Decay Time and and o ther t rou ble shooting issues
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HCU H d ra rau lili c C l in in de der Un itit
HPS Hydraulic Hydraulic Power Supply
BOLL filter
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HPS
Dual cylinder
High Pressure Pipes
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300 bar hyd raulic o il rail fro m th e Safety Bloc k to the HCU’s
Safety blo ck
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HCU from below
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H.p. pipe connection
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Hydraulic Cylinder Unit (HCU)
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Fuel Oil Pressure booster
ME Lubri cator
Accumulator
ELFI valve
Distribution block
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Hydraulic Cylinder Unit (HCU)
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Hydraulic Cylinder Unit (HCU)
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Hydraulic Cylinder Unit (HCU)
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Hydraulic Cylinder Unit (HCU)
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Distribution Block
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Distribution Block
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Distribution Block
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End cover fore side
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End cover fore side
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End cover aft side
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Hydraulic Cylinder Unit (HCU)
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Hydraulic Cylinder Unit (HCU)
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Hydraulic Cylinder Unit (HCU)
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High pressure pipe Suction valve
Fuel pump p unger
Slide Fuel va ve Fuel pum p Fuel oil i nlet 8 bar
Hydraulic piston ELFI Proportional valve
drain
Membrane accumulator
High pressure hydraulic oil – inlet
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Fuel Oil Pressure Booster
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Fuel Oil Pressure Booster
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Fuel Oil Pressure Booster
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Fuel Oil Pressure Booster
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Fuel Oil Pressure Booster
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Fuel Oil Pressure Booster and ELFI valve
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Engine:
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Engine:
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Engine:
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The ELFI is immediately set to Drain Posit ion (safe positio n) if:
The ELFI valve feedback signal is not valid, i.e. outside 3.5 - 20.5 mA
The ELFI valve feedback signal indicates a too high (not physical possible) speed
The ELFI valve feedback signal indicates a position not allowed outside a window around TDC
Fuel Injection i s re-enabled by either: Pressing
the Re-enable button on the Engine->Chief Limiters Screen
Invalidation
and then re-validation of the input ch. 30(cyl. A) or ch. 33 (cyl. B) on the relevant CCU
Resetting
the CCU
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Injection start angle trig
Injection TDC
ELFI valve windo w supervision
In ection control
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Engine: -
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Accumulator , p
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Accumulator
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The accumulator charge pressure should be checked within the first week of service.
Next check should be made around 4 months later, followed by checking every 6 months.
A minor leakage from the accumulators is unavoidable, and service experience shows that a pressure drop in the range of 2-5 bar/month is to be expected.
The charge pressure is dependent on the accumulator temperature. E.g.: 136 bar @ 20°C, 154 bar @ 50°C
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Cylinder Lubricator
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Cylinder Lubricator
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The ME Engine
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C linder lub. oil inlet
Inductive proximity sensor ivin feedback si nal for control of piston movement
Lubricator activation signal from controller
ow sensor
Injection plunger
Spacer for basic setting of stroke Non-return valve
Stroke adjusting screw Sealing ring
Drain oil outlet
200 to 300 bar system oil supply Actuator
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Channel J51 on a wo rkin g CCU
In case of CCU failure, where the CCU cannot be replaced immediately, backup cylinder follows:
Connect temporary cables from two other CCU units, plug 51, to the solenoid valves on the
