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How can it be achieved that in case of an automatic rotor position
adjustment with a 9300 servo controller the motor shaft is stopped
completely after a sudden change of position so that the rotor position
adjustment can be executed correctly?
If the motor shaft is not stopped completely during the rotor position
adjustment and possibly even oscillates, the injected motor current can be
reduced in order to reduce the oscillation excitation.
The motor current height during the rotor position adjustment is derived
from the rated motor current C0088 entered. In order to reduce the
motor current during the rotor position adjustment, C0088 is therefore to
be reduced temporarily. The correct value is to be reset after the
The maximum current setting under C0022 has no influence!
Rotor position adjustment sequence:
During the rotor position adjustment (activation via code C0095) the rotor
of the synchronous machine is 'attracted' approx. every 2 seconds in
succession by several stator magnetic fields defined by the 9300
controller. As a result, the position feedback is referenced to the software
side field orientation of the control. The position between the individual
measuring steps changes suddenly. Especially in case of larger, low mass
inertia synchronous motors the rotor may be excited to oscillate that
strongly that it does not stop between the measuring steps.
Consequently, it is not possible to clearly determine the rotor position. As a
result, the drive performance deteriorates and may depend on the direction
of rotation. If the rotor position is set correctly, the drive performance
does not depend on the direction of rotation.