Modular cab display
The modular driver's cab display (MFA) was a compact display used on traction vehicles. The uniform arrangement of the instruments and indicator lights should enable the driver to quickly grasp the information relevant to the situation. Combining them into one module saved costs in connection with the vehicle. Some models had a serial interface ( MVB or I60 / LZB ) and could be configured and dimmed via it.
MFA were displaced from new projects in the 2000s by modular driver's cab displays (MFD). MFDs use a flat screen for essentially the same display .
example
The left round instrument shows the current pulling / braking forces . In this case it is designed for two ICE power cars : The inner pointer shows the values for the leading, the outer pointer the values for the controlled power car. The forces of the electric brake are displayed here (pointer deflection to the left: braking) - as total braking force in kN. In the other MFA, the inner pointer shows the braking force of the leading and the outer pointer the braking force of the locomotive's trailing bogie (e.g. in the MFA of the 151 series ). A pointer deflection to the right shows the pulling force per drive motor, namely the drive motor with the currently highest pulling force. With a power car with four traction motors, the displayed kN value would have to be quadrupled. Since when braking for the driver, the total braking force is important to z. B. not to overbrake the train in curved tracks or switch connections and thus expose the train to a risk of derailment, the braking value is displayed directly.
The right round instrument is the speedometer. Here the inner pointer shows the current speed (V-Ist), the outer small pointer with LZB guidance the target speed (V-Soll). On vehicles with AFB ( automatic travel and brake control ), the outer pointer also shows the set AFB target speed during PZB operation.
The so-called target distance is visible between the two round instruments. This also includes the small V-Ziel display in the speedometer. In the case shown, the V-Ziel in 9.8 km is also 250 km / h; if a change in speed or even a stop is displayed, the V-Ziel changes to the corresponding value (lower speed, or in the case of an LZB stop, 0 km / h). The middle display then shows the distance to the point at which the speed must be changed or the train must stop. The braking curve , which is specified by the LZB computer to reach the respective target speed, is specified by the outer V target pointer of the speedometer. If the driver exceeds this braking curve at a higher speed, the train is stopped by an emergency brake. A red indicator light "G" at the bottom shows that a braking point has been reached.
Below the round instruments there are several indicator lights that display various information depending on the PZB or LZB operation. In PZB mode, the indicator light for the type of train (55 for the lower type of train , 70 for the medium type of train , or 85 for the upper type of train ) lights up permanently , depending on the braking power of the train ( braking hundredths ) . In addition, a blue indicator light "B" indicates that the LZB is ready for operation. As soon as the train is included in the LZB guidance, the respective indicator light for the PZB train type goes out and the indicator light "Ü" for the LZB guidance lights up. From this point on, the reference variables of the LZB (speedometer and target distance) are also displayed. This indicator block also combines other indicator lights, including the indicator light for the safety driving circuit (SIFA), the indicator light for the door release (T) and a few additional indicator lights for the PZB and LZB.