Question:
Why is there an acceleration delay after pulse enabling?
Answer:
Each pulse enabling (controller enabling or exceeding of the auto-DC brake threshold) is followed by an earth fault detection. This earth fault detection is divided into three parts:
1. Earth fault detection; which is only effected there was a pulse inhibit of 5 seconds before and the earth fault detection is activated via C0119 (C0119 = 0 to 2)
2. Management of the earth fault detection with loading of the bootstrap capacitors (duration 2 ms)
3. Offset correction of the current detection, provided that before there were 5 seconds of pulse inhibit (duration 20 ms)
Comment on point 3. (Offset correction of the current detection): only software version ≥ V2.1
Conclusion:
- The demand of the pulse enabling (e. g. in case of controller enabling terminal or exceeding of auto-DC brake) is delayed by 42 ms in case of active earth fault detection (C0119 = 0 to 2), provided that there were 5 seconds of pulse inhibit.
- If there was no 5-seconds pulse inhibit, the demand of the pulse enabling will be delayed by 2 ms.
- If the earth fault detection is inactive (C0119 = 3 to 5), the demand of the pulse enabling is delayed by 22 ms, provided that there were 5 seconds of pulse enabling.
If these facts are not requested for the operation of the machine, the delay can be minimized as follows:
- With inactivating the earth fault detection the delay of the pulse enabling can be reduced from 42 ms to 22 ms.
- Operate the machine only in excited status by e. g. auto-DC brake-time = infinite (C0106 = 999.0) or inactivate the function auto-DC brake (C0106 = 0 or C0019 = 0)
