Siemens 6SN1123-1AA00-0DA2 Configuration Manual page 19

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If two power transitions in the inverter are simultaneously destroyed, de-
pending on the motor pole number, this can cause brief axis movement.
– Example: Synchronous motor:
For a 6–pole synchronous motor, the maximum mechanical motion
on the motor shaft can be 30 degrees.
With a ballscrew that is directly driven (e.g. 10 mm per revolution) this
corresponds to a maximum linear motion of approximately 0.8 mm.
– Example, synchronous linear motor:
For a synchronous linear motor, the movement can be a maximum of
one pole width, refer to the Motors Configuration Manual.
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For a 1–encoder system, encoder faults are detected by various HW and
SW monitoring functions. It is not permissible that these monitoring functions
are deactivated and they must be parameterized carefully.
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Stop function Category 0 according to EN 60204–1 means that the spindle/
axes are not braked. Depending on the kinetic energy involved, they can
coast–down for a long time.
This must be integrated in the logic of the protective door interlocking (e.g.
with a logic operation with the signal n < nx).
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Violation of limits may briefly lead to a speed higher than the speed setpoint,
or the axis may pass the defined position to a certain extent, depending on
the dynamic response of the drive and on parameter settings (MD).
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Parameterization and programming errors made by the machinery construc-
tion OEM cannot be identified. The required level of safety can only be
assured by a thorough and careful acceptance testing.
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When replacing power modules or motors, the same type must always be
used as otherwise the selected parameters may result in different re-
sponses.
When an encoder is replaced, the axis involved must be re–calibrated.
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If the line infeed units are connected to the line supply, where the minimum
short–circuit current is not reached, then the overcurrent protection devices
will not be able to trip within the appropriate time. There is a risk of fire in the
case of a fault!
SIMODRIVE 611 Configuration Manual (PJU) – 02/2012 Edition
© Siemens AG 2012 All Rights Reserved
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