5.4.7 Pick-up for speed measurement
To measure the engine speed (rpm), proximity sensors are installed in a speed pick-up unit,
attached to the support near the flywheel.
For safety, there are three electrically isolated proximity sensor groups as follows:
•
Speed identification in the remote control system (RCS)
•
Overspeed safety system
•
Speed control system.
The proximity sensors measure the speed of the flywheel (003, Figure 5-31). When the flywheel
turns, the proximity sensors (002) sense the movement of the teeth. The engine control system
sends signals to the RCS to monitor the load and speed related functions. Data are also sent to
the speed indication instruments.
Fig 5-31 Pick-up for speed measurement (generic)
Legend
001 Cover 003 Flywheel
002 Proximity sensor 004 Crank angle mark
X92DF
AA00-4628-00AAA-043A-A
Operation Manual Pick-up for speed measurement
Winterthur Gas & Diesel Ltd.
- 204 - Issue 002 2020-08
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