Operation
4628−1/A1
Winterthur Gas & Diesel Ltd.
1/ 2
Pick-up for Speed Measurement
1. General
Proximity sensors are installed in a speed pick-up unit (1, Fig. 1) and attached to the
support of the fuel pump unit. The proximity sensors measure the engine
speed (rpm).
For safety, there are three electrically isolated proximity sensor groups as follows:
D Speed identification in the remote control system (RCS)
D Overspeed safety system
D Speed control system.
2. Function
The proximity sensors (8, Fig. 2) measure the speed of the flywheel (4). Each time a
tooth passes a proximity sensor, a signal is sent through the DENIS−9520 to the
RCS. The RCS monitors the load and speed-related functions and sends data to the
speed indication instruments.
The crank angle mark (5) is the reference point for the WECS−9520. Each time the
crank angle mark passes the proximity sensor (3), a signal is sent to the crank angle
transmitters. This signal gives indications to compare the measurement of the TDC
position for cylinder No. 1.
2014
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