Remedied from:
ECSxP Posi&Shaft V1.3 onwards
Behaviour of the new version?
The actual position is now always initialised correctly when an absolute value encoder is used, even if:
- the motor mounting position differs from encoder mounting position (C3000 does not equal C3001) and
- the reference measuring offset C3012 does not equal 0.
The fault message No. 425 'InvHomingOffset' which had been implemented in previous Posi&Shaft versions has been removed in relation with this modification. Since it only served to avoid those kind of settings in case of which the actual position was incorrectly generated before, it is useless now.
Which products are affected?
ECSxP Posi&Shaft <=V1.2
What happens?
The actual position is initialised with the inverted value of the reference measuring offset (C3012).
If a value is entered under C3012 (reference measuring offset) and homing is executed afterwards, the actual position is initially set correctly to the value entered under C3012. The actual position only becomes incorrectly when the mains is switched on.
When does the problem occur?
The following three conditions must be complied with:
- an absolute value encoder (multi-turn) must be used as position encoder and
- the motor mounting position must differ from the encoder mounting position (C3000 does not equal C3001) and
- the reference measuring offset C3012 does not equal 0.
Possible diagnostics?
The faulty behaviour can be understood if initially a value for the reference measuring offset is entered under C3012, homing is executed subsequently and the mains is switched on finally. As a result, the current position (C3051) indicates erroneously the inverted value of code C3012 after mains connection.
Short-term measures/recommendations?
None. Do not change the default setting of the reference measuring offset (C3012 = 0).
Evaluation:
The conditions which must be complied with at the same time in order to provoke the occurrence of the behaviour described before only appear in very few applications. Thanks to the description mentioned above it can be understood why the faulty behaviour occurs when the mains is switched on. As a result, the function restriction can already be diagnosed correctly during commissioning.
Published with service message No. 2007/02 and 2007/03
