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© Siemens AG 2008 All Rights Reserved
SIMODRIVE 611 Configuration Manual (PJU) – 05/2008 Edition
S 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.
S 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.
S 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).
S 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).
S 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.
S 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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