Attention:

The password "settings" is required to change the configuration of the BML.

1. BML information: Product information (BML designation, order code, serial number, etc.) > The field is updated automatically.
2. System parameters: Product parameters, calibration of ring applications, .... > These parameters can be changed.
3. Position: Position values and condition monitoring (BEF graphic), setting the zero point, display of error bits, .... > Start setting can be changed.

The BML system continuously evaluates its internal sensor signals and calculates the BEF value (Balluff Exactness Factor) even during normal system operation. This number is a direct measure of the quality of the magnetic track, the mounting, the condition of the magnetic tape and the sensor head. Useful for condition monitoring and predictive maintenance.

A System in good condition:

Good:

In the images above, the sensor head is in the working area.

Bad:

In the lower images, the measuring body is partially covered by a magnetizable material between position 50,000 and 70,000. The signal quality is reduced there compared to the intact measuring body, although the position can still be reliably detected. The higher the signal quality, the better the quality of the internal signals. Values down to 1 are sufficient.

1. BML function calls in chronological order
2. System parameters: Product parameters, calibration, .... > These parameters can be changed.
3. Calibration: The calibration routine is used, among other things, to verify the overall system or to extend the working range, especially for systems with large maximum measuring lengths.

The following points must be observed:

- Calibration must be carried out over the entire measuring distance!

- The value for the calibration length (Length [mm]) must not be greater than the measuring distance over which the sensor head is moved during calibration.

- The maximum duration of the calibration routine (measured value acquisition) is defined via the "Duration [ms]" setting. The calibration duration should be as short as possible. (For a WinXP computer with 512 MB RAM and 1.5 GHz, for example, a maximum calibration duration of 30 seconds is recommended).

- Calibration can only be performed in one direction. A reversal of direction during a calibration run leads to a restart of the routine (with regard to the calibration length).

In the vernier system presented here, 2 phases are used to calculate the absolute position:

- the vernier phase (N. phase)

- the segment phase (S. phase)

The maximum error over the entire calibration range is shown in N. Phase Error/S. Phase Error in angular degrees.

The maximum tolerable phase errors of each track are displayed in the corresponding window Tolerable N. Phase / Tolerable S. Phase in angular degrees.

N. Phase Error/S. Phase Error should always be smaller than their maximum tolerable limits in order to ensure safe operation.

The respective diagrams of the N. Phase Error/S. Phase Error show the measured values of the phase errors over time in time-equidistant intervals.

They are only intended to serve the measuring scale and set-up quality.

A successful calibration is indicated in the status text field by the message "Calibration Successfull":

The set measuring length has not been completely exceeded:

The measured distance (Periods read) does not correspond to the required minimum measuring length (Length).

System accuracy not sufficient:

The measured distance (Periods read) corresponds to the required minimum measuring length (Length), but in the following screenshot the phase error of the segment track is outside the permitted tolerance. This can be seen because the maximum phase error that was measured (S. Phase Error with 6.81 angular degrees) is outside the tolerable angular error (Tolerable S. Phase with 4.92 angular degrees).

Causes such as:

Large air gap, Lateral offset, Measuring body damaged, Measuring body incorrectly oriented, Coding from measuring body does not match, Defective sensor head

Measuring in the physical edge area of the measuring element:

A large phase error at the beginning or end of the calibration run may indicate that the calibration was started or ended too close to the scale limits.