Siemens Sinumerik 840D sl Function Manual page 49

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Warning
!
S The "Automatic restart" function of SINAMICS S120 must not be used in
conjunction with safety functions since this is prohibited in EN 60204--1,
Chapter 9.2.5.4.2. (Deselecting a safety shutdown function alone must not
result in machine restarting.)
S Encoder faults are detected using various hardware and software monitoring
functions. It is not allowed to disable these monitoring functions and they must
be parameterized carefully. Depending on the fault 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.
S 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 an appropriately long time depending on the
level of kinetic energy involved) or can even be accelerated by drawing/pulling
loads. This must be included in the protective door locking mechanism logic,
e.g. with the logic operation n<n
S 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 parameters/machine
data settings that have been entered (see Chapter 6, "System/drive integrated
safety functions").
S A position--controlled axis may be forced out of the safe operating stop state
(SBH) by mechanical forces that are greater than the maximum torque of the
drive motor. In such cases, a stop function, Category 1 according to EN
60204--1 (STOP B) is activated.
S Safety Integrated is not capable of detecting parameterization and
programming errors made by the machine manufacturer. The required level of
safety can only be assured by careful acceptance testing.
S Motor modules and motors must always be replaced with the same equipment
type. If this is not the case, the parameters will no longer match the actual
configuration -- causing Safety Integrated to respond incorrectly. The axis
involved must be re--commissioned if an encoder is replaced.
S If an internal or external fault occurs, none or only some of the parameterized
safety functions are available during the STOP--F response triggered by the
fault. This must be taken into account when a delay time between STOP F and
STOP B is parameterized. This applies in particular to vertical axes.
S An additional residual risk is obtained as a result of the possible random
hardware faults for electronic systems, arising from their very principle, which is
expressed using this PFH value.
© Siemens AG 2015 All Rights Reserved
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) - - 10.2015 Edition
3.5 Safety information & instructions and residual risks
x.
System Features
3-49