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Before an automatic measurement of the speed profile is performed, it is important
to adjust the threshold speed of the engine. If the threshold speed step is reduced
later, after measurement of the speed profile, then the measurement must
be repeated.
The different methods to perform an automatic measurement with momentary track
contacts or occupancy sensors are outlined in the following. Further details about the
different types of sensors and their usage can be found in section 5.8, “Arranging Indicators
in a Block”.
78
Measuring with Momentary Track Contacts
Start End
Length
Diagram 60: Measurement with Momentary Track Contacts
For the measurement with momentary contacts two momentary contacts are needed.
These contacts are associated with two contact indicators, called “Start” and “End”. The
length of the track section used for the measurement is determined by the distance between
the two track contacts.
To start the measurement put the engine on the track in a certain distance left of indicator
“Start” heading to indicator “Start”. The engine will be started in forward direction.
When it reaches the indicator “Start” the measurement of the current speed step begins.
When the engine reaches the indicator “End”, then the engine is decelerated and
stopped. Now the engine reverses the direction and the measurement of the same speed
step in backward direction is performed, now using indicator “End” for the beginning
of the measurement and indicator “Start” for the termination. After reaching indicator
“Start” the engine is decelerated and stopped and the measurement is repeated for the
next speed step in both directions.
The whole procedure is repeated until the speed step that corresponds to the specified
maximum speed has been measured.