23.3.1.2 Testing of the overspeed trip by using a signal
generator
1 Connect the signal generator (848113)
to both speed
sensors one at a time. The signal generator is connected to the pins
signal and gnd of the speed sensor. See the Fig 23-26 for connec-
tions. The overspeed stop should be detected when the overspeed
limit is exceeded.
Note!
To avoid lubrication shut down when simulating engine speed
on a standstill engine the pressure transmitter PT201-1 and
pressure switch PSZ201 can be disconnected. See installation
specific electrical drawings for connections.
2 Increase the frequency
of the input signal.
3 Check at what frequency
the overspeed is detected.
The speed is detected from the camshaft gear. The rotation speed of
the camshaft gear is half of the engine rotation speed. The frequency
corresponding to the overspeed can be easily calculated when the
teeth number of the camshaft gear is known. In an engine with
planetary gear the camshaft gear has 42 teeth. In an engine without
planetary gear the camshaft gear has 48 teeth.
The following formula gives the frequency detected by the
sensor corresponding to engine speed:
Frequency
(
Hz
)
=
æ
ç
è
Speed
[
rpm
]
2
ö
÷
ø
æ
ç
è
Teeth
Number
60
ö
÷
ø
The frequency corresponding to the engine speed is shown in
tables below with engine nominal speed of 720 rpm and 750 rpm
accordingly.
Table 23-1
Frequency corresponding to
speed
No planetary gear
Planetary gear
720 rpm (nominal speed)
288 Hz
252 Hz
828 rpm (15% overspeed
limit, DCU/SMU)
331 Hz
290 Hz
850 rpm (18% overspeed
limit, RM)
340 Hz
297 Hz
23
Instrumentation and Automation
32-200115/II
23-8
WÄRTSILÄ 32
Содержание VASA 6L32
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...