Which products are affected?
Function restriction eliminated on the 9300EP servo positioning controller as of versions V2.5 and V6.1.
Eliminated function restriction
Synchronous motor can overspeed if in the encoder selection there is a switch to absolute value encoder and no mains connection is performed before the enable signal. After the changeover to absolute value encoder the latter must not be used straight away but only after a reinitialisation with mains connection. If this is not done, the rotor angle required for operation of the synchronous motor will not be correct.
Changeover of the speed/position encoder by means of C0025, C0490 and C0495 has now been changed to the effect that in selection of an absolute value encoder an absolute value encoder error (SD7) is triggered. Since the SD7-TRIP can only be reset by means of a mains connection, a mains connection is forced with re-initialisation.
Possible diagnostics?
None because owing to the principle there is no comparative value for the rotor angle.
Short-term measures/recommendations?
Make sure that after the switchover to an absolute value encoder a mains connection is always performed.
Evaluation:
Response generally occurs just after initial commissioning if the encoder is also selected. Later, initialisation is always performed properly after the mains connection.
