2 General Information about Integrated Safety Systems
11.03
2.12 Error analysis
© Siemens AG 2003 All Rights Reserved
2-50
SINUMERIK 840D/SIMODRIVE 611 digital SINUMERIK Safety Integrated (FBSI) - Edition 11.03
For a 6-pole synchronous motor, the axis can move by a maximum of
30 degrees. With a ballscrew that is directly driven by, e.g. 20 mm per
revolution, this corresponds to a maximum linear motion of approximately
1.6 mm.
Example, synchronous linear motor:
For a synchronous linear motor the movement must be no more than one
pole width. This corresponds to the following distances:
1FN1-07 2
7
mm
1FN1-12/-18/-24 36
mm
1FN3 20
mm
•
For a 1-encoder system, encoder faults are detected by various HW and
SW monitoring functions. These monitoring functions may not be de-
activated and must be parameterized carefully. Depending on the error
type and which monitor responds, a Category 0 or Category 1 stop function
according to EN 60204-1 (defined as STOP A or B in SINUMERIK Safety
Integrated
®
) is activated.
•
The Category 0 stop function according to EN 60204-1 (defined as
STOP A in Safety Integrated) means that the spindles/axes are not braked
to zero speed, but coast to a stop (this may take a very long time depen-
ding on the level of kinetic energy involved). This must be included in the
protective door locking mechanism logic (e.g. with the logic operation n<n
x
.
•
When a limit value is violated, the speed may exceed the set value briefly
or the axis/spindle may overshoot the setpoint position to a greater or
lesser degree during the period between error detection and system
response. This depends on the dynamic response of the drive and the
parameter settings (refer to Chapter 3, "Safety-relevant functions").
•
A position-controlled axis may be forced out of the safe operating stop
state (SBH) by mechanical forces that are greater than the max. axis
torque. In such cases, a safe standstill (SH) is activated.
•
SI is not capable of detecting parameterization and programming errors
made by the machine manufacturer. The required level of safety can only
be assured by thorough and careful acceptance testing.
•
Drive power modules and motors must always be replaced with the same
equipment type or else the parameters will no longer match the actual
configuration and cause SI to respond incorrectly. The axis involved must
be re-commissioned if an encoder is replaced.
