Eliminated from:
9300EK cam profiler from version V8.1
9300EP position controller from version V8.0
9300ES servo controller from version V7.0
Behavior of the new version?
A parameter change of the number of periods (C0420) now always results in a Sd7 trip. This trip can only be reset by switching off power leading to a new (correct) initialization of the absolute position and the rotor position.
What happens?
The modified number of pulses per revolution under C0420 does not always lead to a SD7 Trip in order to cause mains switching and consequently the required re-initialization of the actual position and the rotor position. The re-initialization of the rotor position is required for the safe operation of synchronous motors.
When does the problem occur?
In case of absolute value encoders when the number of pulses per revolution has been modified under C0420.
Possible diagnostics?
The drive does not reach the required torque or the monitoring following error is activated.
Short-term measures/recommendations?
After modification of the absolute value encoder settings always execute mains switching.
Owing to the principle the usage of synchronous motors in combination with hiperface absolute value encoders require a re-initialization by mains switching, when the encoder type or other encoder setting parameters, just as the number of pulses under C0420 in this case, have been modified.
Evaluation:
The setting parameters for the feedbacks are modified only in the framework of initial commissioning or when service work becomes necessary in case of reconnection so that an incorrect behaviour is detected immediately or does not occur anymore as of the first mains switching.
