The WECS-9520 selects a cylinder at random and starting air flows into this cylinder. The
position of the crankshaft means that the engine will start to turn slowly ahead, astern or stay in
position.
The algorithm selects the next applicable cylinder. Starting air flows into this cylinder and the
engine turns slowly in the applicable direction.
When the engine turns the crankshaft to a position after TDC or BDC (on the first cylinder), one
of the reference flags is found. The related ACM-20 sends the accurate crank angle signal to
the WECS-9520. The engine start-up sequence is correct.
6.2.4.4.4
Sequence
The sequence is as follows:
•
The WECS-9520 sends a signal to start the engine.
•
The crank angle algorithm data goes to the WECS-9520.
•
The WECS-9520 selects the cylinders (from the algorithm data received) that the starting
air will flow to.
•
The crankshaft starts to turn in the slow-turning mode.
•
The engine starts correctly.
6.2.5
WECS-9520 and external systems - communication
The Diesel Engine Control and Optimizing Specification (DENIS) and the WECS-9520 are
designed so that different propulsion control systems can be used. All nodes are fully specified.
The terminal boxes are installed on the engine, to which the cable ends from the control room or
from the bridge.
The engine control has all the parts necessary to operate and monitor the engine, and for the
safety of the engine.
The WECS-9520 supplies the data communications to the items that follow:
•
The propulsion control system (PCS)
•
The alarm and monitoring system (AMS)
•
Control panel at local maneuvering stand
•
The BACKUP control panel in the control room.
The standard version of WECS-9520 includes the external communications that follow:
•
Two redundant data cables to the PCS
•
Two redundant data cables to the AMS
•
One data cable to the local control panel
•
One data cable to the BACKUP control panel in the control room
•
One data cable to a connector at the BACKUP control panel of the remote control for
connection to a notebook for the service personnel.
NOTE:
The communications between the systems can be different. See the related
documentation from the approved system manufacturer.
X92DF
AA00-0000-00AAB-043K-A
Operation Manual
Engine control system WECS-9520
Winterthur Gas & Diesel Ltd.
- 266 -
Issue 002 2020-08
