Corrected from:
- Inverter Drives 8400 HighLine V15.01.00
- Inverter Drives 8400 TopLine V15.01.00
Response of the new version:
The MCK setpoint and the setpoint for the motor control are synchronous.
Which products are affected?
8400HighLine and TopLine: FW version ≤ 13.00.00.00
What happens?
If the setpoint LS_MotionControlKernel.nSpeedSet_v is used as a master value for electrical shaft applications, during quick stop a speed-dependent position difference between the master and slave can be observed. In the worst case, there is mechanical tension.
When does the problem occur?
With an active quick stop, the speed setpoint at LS_MotionControlKernel.nSpeedSet_v is always output with a delay of 1ms. This means that the speed controller has already received this setpoint in the previous call cycle, and not in the current cycle.
Diagnostics options?
For the purpose of comparison, the profile generation should be transferred to an 'external' ramp generator (e.g. L_SRFG), using the same parameters as for the quick stop. The recorded drive behaviour without a setpoint delay can be considered as a reference. If tension and/or position differences only occur during the quick stop process, we are dealing with the response described.
Short-term measures/recommendations?
None.
Evaluation:
The setpoint delay cannot be compensated by means of the conventional methods, since it only occurs in the case of quick stop, i.e. also unexpectedly (monitoring response). Only in few applications, a delay of 1ms brings about disruptive position differences during quick stop.
