Point force meter

The forces measurable between the point machine and the points are important characteristics of how the two work together. Regular force measurements make it possible to diagnose the connection between points and point machine and to find faults and throwing problems.

One of the main goals in developing the VEM-02 was to allow measurement results to be evaluated on site as quickly as possible. MÁV previously used a force meter that recorded the measured values in analogue form. Because reading them was not accurate enough, an instrument was needed that not only records the measurement curve graphically but also displays and records the maximum measured force numerically, together with the other identifiers needed for documentation. This makes it possible to decide immediately whether any intervention is needed on the points or point machine being tested.

The device also works as a data logger; its software allows previously stored curves to be selected, so measurement data can also be documented later. One way to do this is the built-in printer of the device.

A much more efficient way to organise and document measurement results is computer-based data processing. The VSD data processing program, developed with user experience in mind, meets the requirements in every respect.

Main functions of the VSD program

• downloading data from the point force meter (RS232, USB)
• selecting among the downloaded data
• adding further information to the recorded curves
• sorting the downloaded data by characteristics
• tools for analysing and comparing graphs (zoom out, zoom in, overlaid curves, time markers)
• printing graphs

MÁV has put the VEM-02 and the VSD data processing program into service and uses them widely, both in the maintenance and the regular, prescribed inspections of point machines and in the overhaul of point machines.

Advantages

• Light, portable design
• Low sensitivity to interference, hence increased measuring accuracy
• Software-based point diagnostics
• Graphical recording of measurement curves
• Computer-based storage of data on changes in the condition of points and point machines

References

• MÁV: 200 units
• Italian State Railways (FS): 30 units