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10.07
06.05
E Siemens AG 2013 All Rights Reserved
SIMODRIVE POSMO A User Manual (POS1) – 08/2013 Edition
At the present time, other known residual risks are:
S
Acceleration of the spindle or axes due to:
– Encoder errors, e.g., errors in the absolute measuring system
(CD track), loose contacts in encoder cables or unsuitable en-
coders.
– Cyclically interchanged phases of the motor connections
(V–W–U instead of U–V–W).
– Interchanged control sense.
– Electric faults (defective components, etc.).
– Transfer of an incorrect, but plausible actual value in absolute
measuring systems (encoder does not signal an error).
S
For a 1-encoder system, encoder faults are detected by various HW
and SW monitoring functions. It is not permissible that these moni-
toring functions are de–activated and they must be parameterized
carefully.
S
Stop function Category 0 according to EN 60204-1 means that the
spindles/axes are not braked. Depending on the kinetic energy in-
volved, they can coast–down for a long time.
This must be integrated in the logic of the protective door interlocking.
S
When a limit value is violated, higher speeds than have been set can
briefly occur or the specified position position can be exceeded to
some degree from between the error being detected and the system
responding. This depends on the dynamic response of the drive and
the parameter settings (MD).
S
Parameterization and programming errors made by the machinery
construction OEM cannot be identified. The required level of safety
can only be assured by a thorough and careful acceptance testing.
S
When replacing the drive unit or motor, the same type must always
be used as otherwise the selected parameters may result in differ-
ent responses.
When an encoder is replaced, the axis involved must be re–cali-
brated.
Foreword
J
xv
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