MAN B&W L28/32H, Manual

Page: 169 / 218

08028-0D/H5250/94.08.12
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1631457-0.0
Page 1 (2)
Engine Control Box E 19 06 4
General
The Safety System
The engine control box is watching the most
important safety operating functions of the diesel
engine, i.e. low lub. oil pressure, high cooling water
temperature, and overspeed.
If an unintended condition occurs to one of the above
functions, the engine control box will release
automatic stop of the engine (shut-down).
In order to avoid an unintended re-starting after
release of a shut-down, there is a built-in reset
function which has to be activated before the engine
can be re-started. Remote reset is also possible.
Besides, there are built-in start/stop procedures for
the engine. On fig. 1 the possible external connections
and input/output signals are shown.
On the front cover of the engine control box there are
an indication panel.
There are indications for:
- Power
- Lub. oil shutdown
- High temp. fresh water shutdown
92.25
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Power supply
24 V DC, 6 A ±20%
Input from engine
- Engine run signal
- Pressurestate PSL 22 lub.oil
pressure low - shut-down
- Thermostate TSH 12 cooling
water - shut-down
- Microswitch SSH 81 speed
high - Shut-down
- Stop
- Start interlock
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Output to engine
- Power supply
- Stop signal - shut-down solenoid
- Start signal
Fig 1 External connections to/from the engine control box .
- Overspeed shutdown
- Start failure
- Wire break
- Start interlocks
There are push buttons for:
- Start
- Stop
- Reset
- Lamp test
Alarm Blocking
The engine control box is provided with a relay output
for alarm blocking. It is advisable to use in case of
too low lub. oil pressure, so that alarm is avoided
during starting and stopping of the engines.
Start/Stop of the Diesel Engine
As the engine control box can give the diesel engine
a signal of normal start/stop, it is possible to mount
remote switches for these functions.
From main switch board
- Start signal
- Stop signal
- Emergency stop signal
- Reset signal
To main switch board
- Common shutdown
- Start failure
- Power failure
- Cable failure
- Alarm blocking
- Engine run
To pre.lub. oil pump starter
- Start/stop signal