Local Operating Panel (Lop); Control Network; Hydraulic Power Supply (Hps) - Man B&W S80ME-C7 Project Manual

MAN B&W

Local Operating Panel (LOP)

In normal operating the engine can be controlled
from either the bridge or from the engine control
room.
Alternatively, the LOP can be activated. This re-
dundant control is to be considered as a substi-
tute for the previous Engine Side Control console
mounted directly onto the MC engine.
The LOP is as standard placed on the engine.
From the LOP, the basic functions are available,
such as starting, engine speed control, stopping,
reversing, and the most important engine data are
displayed.

Control Network

The MOP, the backup MOP and the MPCs are
interconnected by means of the doubled Control
Network, A and B respectively.
The maximum length of Control Network cabling
between the furthermost units on the engine and
in the Engine Control Room (an EICU or a MOP) is
60 meter.
Should the layout of the ship make longer Control
Network cabling necessary, a Control Network
Repeater must be inserted to amplify the signals
and divide the cable into segments no longer than
60 meter. For instance, where the Engine Control
Room and the engine room are located far apart.
Power Supply
Supply voltage, nominal
Supply voltage, operational
limits
Supply voltage, max. ripple
voltage
MAN B&W ME/MEC engines
24 V DC
20 V - 30 V
±  Vpp or  Vrms,
whichever is lowest
MAN Diesel

Hydraulic Power Supply (HPS)

The purpose of the HPS unit is to deliver the
necessary high pressure hydraulic oil flow to the
hydraulic cylinder units (HCU) on the engine at
the required pressure (approx. 200 bar) during
startup as well as in normal service.
As hydraulic medium, normal lubricating oil is
used, and it is in the standard execution taken
from the main lubricating oil system of the engine.
The HPS unit can be driven either mechanically
from the engine crankshaft, see Fig. 6.0.02.
The HPS unit consists, if mechanically driven, of:
• A crankshaft driven stepup gear
• Three or four engine driven pumps
• Two electrically driven pumps
• An automatic filter with a redundancy filter
• A safety and accumulator unit.
The multiple pump configuration with standby
pumps ensures redundancy with regard to the
hydraulic power supply. The control of the engine
driven pumps and electrical pumps are divided
between the three ACUs.
The high pressure pipes between the HPS unit
and the HCU are of the double walled type, hav-
ing a leak detector. Emergency running is possible
using the outer pipe as pressure containment for
the high pressure oil supply.
The sizes and capacities of the HPS unit depend
on the engine type. Further details about the lu-
bricating oil/hydraulic oil system can be found in
Chapter 8.
16.01
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