WÄRTSILÄ PAAE051728, Instruction Manual

Page: 338 / 394

23.2.3.1 Starting
There are some important properties to be noticed in the start
system of the WECS:
·
Start conditions are all configurable so they may vary de-
pending on the installation,
·
The engine will not start, if either local or remote reset
button isn’t pressed after shutdown.
23.2.3.2 Stopping
There are some important properties to be noticed in the stop
system of the WECS if the stop override signal is included.
·
The emergency stop signal and overspeed shutdown are not
blocked by the stop override signal,
·
The stop override signal is connected via the Relay Module
to the MCU.
23.2.3.3 Start blockings
A start blocking is caused by the following conditions on a marine
engine:
·
low prelubricating oil pressure,
·
turning gear engaged,
·
stop lever in stop position,
·
local/remote switch in local position (blocks the remote start),
·
local/remote switch in remote position (blocks the local start).
On a standard stationary (power plant) engine there are in
addition start blockings for the following conditions (these are all
configurable, i.e. they may vary depending on the installation):
·
engine not preheated (low HT water temp., engine outlet),
·
low fuel oil pressure,
·
low starting air pressure.
If the start blocking is active, it is impossible to perform a start of
the engine. On the Modbus an alarm is given for each start
blocking being active.
23.2.3.4 Shutdowns
An engine shutdown is carried out as a normal stop, i.e. by
activating at the same time the engine pneumatic stop and the
speed governor stop function.
The function of the speed governor stop output in the WECS
system can be configured to correspond to the speed regulator.
The speed governor has an activated or de-activated input for
stopping the engine. The sensors used for shutdown are of ana-
logue type, and the shutdown levels are defined in the WECS
software.
The shutdown is latching, and a shutdown reset has to be given
before it is possible to re-start. Naturally, before this the reason
of the shutdown must be investigated. The reason of any shut-
down will be indicated on the Modbus communication link to the
external systems.
23 Instrumentation and Automation 32-200115/II
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