Power Supply For Engine Control System; Hydraulic Power Supply (Hps) - Man B&W S50ME-B9.3-TII Project Manual

MAN B&W

Power Supply for Engine Control System

The Engine Control System requires two separate
power supplies with battery backup, power supply
A and B.
The ME-ECS power supplies must be separated
from other DC systems, i.e. only ME-ECS compo-
nents must be connected to the supplies.
Power supply A
System IT (Floating), DC system w.
individually isolated outputs
Voltage Input 100-240V AC, 45-65 Hz,
output 24V DC
Protection Input over current, output over
current, output high/low
voltage
Alarms as potential AC power, UPS battery mode,
free contacts Batteries not available (fuse fail)
Power supply B
System IT (Floating), DC system w.
individually isolated outputs
Voltage Input 110-240 VAC, output 24V DC
Protection Input over current, output over
current, output high/low
voltage
Alarms as potential AC power, UPS battery mode,
free contacts Batteries not available (fuse fail)
High/Low voltage protection may be integrated in
the DC/DC converter functionality or implemented
separately. The output voltage must be in the
range 18-31V DC.
MAN B&W ME-B engines

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. 300 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.
Hydraulic power is supplied by two electrically
driven pumps. The pumps are of the variable dis-
placement type and are the same size. The dis-
placement of the pumps is hydraulically controlled
to meet the pressure set point from the ECS.
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.
MAN Diesel
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