Touch Probe inputs, deceleration

Question:
Which deceleration times must be calculated at the Touch Probe inputs of the ES, EK, ER and EP 9300 drive controllers?

Answer:
Following deceleration times of the Touch Probe inputs (rising edge) are supposed to be calculated:

• Hardware deceleration: 10 µs with a tolerance of ± 20 % (mainly dependent on temperature)
• during AIF communication: sporadically + 10 µs
  
• during CAN communication: sporadically + 5 µs
  

This means, the usage of the AIF and / or CAN communication has influence on the deceleration times of the TP inputs and consequently on the reachable precisions. In contrast to the fixed hardware decelerations the influence of the communication varies, dependent on the random coincidence of communication and TP. The fixed decelerations can be compensated by corresponding dead-time compensation. The variable parts of the decelerations can, however, lead to a varying precision.

Tip:
The reachable precision of the TP evaluation can be improved by applying the AIF and CAN communication - if possible - to phases without TP evaluation.
The falling edge (HIGH-LOW signal at the hardware terminal) leads to a hardware deceleration of approx. 100 µs. For the communication part the above-mentioned times are the same.

URL for linking this AKB article: https://www.lenze.com/en-de/go/akb/20030559/1/