Corrected from:
No correction is planned for this restriction.
Response of the new version:
...
What happens?
After re-initialising the resolver as additional position encoder, the current position in the drive changes significantly although the resolver has not been turned. Re-initialisation will e.g. be carried out if the inverter is restarted or the parameters of the position feedback system or the motor control mode C6 are changed.
Erroneously, the 'Home position known' status remains active.
Another maloperation occurs if the resolver is turned when it is switched off (permissible range for C80=1) +-0.5 rev.. After a restart, the rotation is not detected and the position before and after mains switching is the same.
When does this behaviour occur?
The behaviour occurs if the resolver is not set as motor encoder but as position encoder:
· Position control C2570=2 or 3 'Position control active' and
· Position encoder C490=0 'Resolver at X7'.
Which products are affected?
Short-term measures:
If the resolver shall only be used as position encoder, a new homing process must be carried out after restarting the inverter or changing the parameters of the position encoder.
Evaluation/recommendations:
· After occurrence of the above behaviour, the travel range limits or positions with obstacles are no longer displayed correctly in the inverter. This may lead to collisions. The transported material may be damaged.
· The behaviour should always be detected during commissioning when checking the reconstructed position after mains switching.
· Applications in which resolvers are not evaluated as motor encoders but only as position encoders are special cases.
