23.2
Functional description
23.2.1 General
In this chapter the functional tasks of the WECS are described.
Speed measurement is separated from other measuring systems
because of its special character. Safety task includes several
functions like alarms, timings, start/shutdown control and fuel
limiting.
23.2.2 Speed measuring
The engine speed is measured by two pick-ups, and the turbo-
charger speed by one pick-up per charger.
One of the engine speed pick-ups is connected to a DCU. The
speed calculation is carried out in the DCU software. In case of
overspeed of the engine, the DCU to where the pick-up is con-
nected, will initiate a stop or in case of marine single main engine
the DCU will release the stop when speed is under a set limit e.g.
nominal speed. This function is called pumping overspeed. The
idea is to limit the revolutions when the propelles is rising above
sea level in rough sea.
The second engine speed pick-up is connected to the Relay Mod-
ule, which is located in the WECS cabinet of the engine. The Relay
Module initiates a shutdown of the engine in case the overspeed
is not detected by the DCU connected pick-up. The Relay Module
speed pick-up is also used to supress the PSZ 201 low lube oil
pressure shutdown when engine is standstill.
The turbocharger speed pick-up is connected to a DCU or an
SMU, depending on the structure of WECS. The speed calculation
of the turbocharger is carried out in the DCU software.
23.2.3 Safety system
The safety system is implemented in the software of the WECS.
In addition, there are some redundant safety functions in a
hardwired system (Relay Module). The safety system can be split
up in five major parts; starting, stopping, start blocking, shut-
down and load reduction.
32-200115/II
Instrumentation and Automation
23
WÄRTSILÄ 32
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Страница 18: ...Appendix B Welding Precautions 200640 00 6...
Страница 26: ...01 Main Data Operating Data and General Design 32 200634 01 01 8 W RTSIL 32...
Страница 60: ...Appendix A Environmental Hazards 200507 02A 10...
Страница 68: ...Page 7 7 Document No 4V92A0645 Rev j...
Страница 84: ...03 Start Stop and Operation 32 200402 04 03 12 W RTSIL 32...
Страница 98: ...04 Maintenance Schedule 32 200623 01 04 14 W RTSIL 32...
Страница 154: ...07 Tightening Torques and Use of Hydraulic Tools 32 200643 01 07 30 W RTSIL 32...
Страница 162: ...08 Operating Troubles Emergency Operation 32 200402 01 08 8 W RTSIL 32...
Страница 164: ...Specific Installation Data 2005 01 09 2...
Страница 178: ...10 Engine Block with Bearings Oil Sump and Cylinder Liner 32 200150 10 14 W RTSIL 32 34SG...
Страница 216: ...Appendix A Testing of cylinder tightness 32 200142 A 4 W rtsil 20 32 34...
Страница 226: ...13 Camshaft Driving Gear 32 200546 02 13 10 W RTSIL 32...
Страница 253: ...U tube manometer Fig 15 12 401508200050 32 200549 10 Turbocharging and Air Cooling 15 W RTSIL 32 15 19...
Страница 254: ...15 Turbocharging and Air Cooling 32 200549 10 15 20 W RTSIL 32...
Страница 274: ...16 Injection System 32 200627 01 16 20 W RTSIL 32...
Страница 280: ...Fuel System 32 200508 07 17 6 W RTSIL 32...
Страница 314: ...19 Cooling Water System 32 200050 19 14 W RTSIL 32...
Страница 394: ...23 Instrumentation and Automation 32 200115 II 23 60 W RTSIL 32...