The required safety shutdowns depend on the type of installa-
tion. Shutdown conditions and limits are specified in the instal-
lation specific documentation.
Shutdown backup system
Some shutdown functions of the WECS are backed up in the Relay
Module, which is an independent hardwired system. These func-
tions are:
·
low lubricating oil pressure,
·
overspeed trip,
·
optional shutdown switch.
Also the emergency stop button is connected to the Relay Module.
The lubricating oil pressure shutdown is initiated by a dedi-
cated pressure switch. To avoid shutdown at stand-still and
stopping engine, the lube oil pressure shutdown is suppressed at
low engine speed.
The Relay Module is using a separate speed sensor (proximity
switch) for generating an overspeed trip. The trip level is set
slightly higher than the level in the WECS configuration, and the
function is latching.
23.2.3.5 Load reduction
If load reduction set points are defined in WECS they are specified
in the installation specific documentation. When a set point is
exceeded a load reduction request will be activated to the external
system. The load reduction is always handled by the external
control system or manually by the operator.
23.2.4 Monitoring and alarm sensors
23.2.4.1 WECS signal processing
In WECS the data acquisition is distributed. This means that
sensors are connected to distribution units - SMU’s or DCU’s -
which are located close to groups of sensors. Only start and stop
related switches are connected to the MCU. Backup sensors are
connected to the Relay Module.
Measured values are transferred in analogue mode only from
the sensor to the DCU/SMU. After that the values are in digital
mode.
32-200115/II
Instrumentation and Automation
23
WÄRTSILÄ 32
23-5
Содержание PAAE051728
Страница 4: ......
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...