Boundary Conditions - Siemens Sinumerik 840D sl Function Manual

10/15
7.6.9

Boundary conditions

S When testing the mechanical braking system, it is not permissible that traverse
to fixed stop (FXS) or traversing with a limited torque, FOC are simultaneously
active. In this case, Alarm 20092, "Axis %1 travel to fixed stop still active" is
triggered.
S During the brake test, contour monitoring is not active. After the PLC has
started traversing motion then there is also no standstill monitoring.
S The function test/check of the brake mechanical system cannot be used for
gantry axes.
S For other "travel to fixed stop" applications, machine data MD37050 $MA_
FIXED_STOP_ALARM_MASK and MD37052 $MA_FIXED_STOP_
ALARM_REACTION should be adapted.
S If FC18 is called for the same axis in the remainder of the user program, the
calls must be mutually interlocked. For example, this can be achieved via a
common call of this function with an interlocked common data interface for the
FC 18 parameters. An additional option is to call the FC 18 a multiple number of
times, in which case the inactive FC 18 must be skipped. An interlock against
being used a multiple number of times must be provided.
S The feed override should be set to 100% so that the required velocity can be
reached during the test. If this is realized via the interface, then it should be
carefully noted that if the brake test is not successful, then the override does
not statically remain at 100%. As an alternative to directly writing to the inter-
face, a message can be generated.
S The torque limits change when a parameter set is changed over.
S Changing the reference torque p2003 means that the use of a referred torque
quantity results in a different dynamic behavior. If p2003 is changed then this
alters the system behavior when the brake test is performed. In order to avoid
this, when booting, the NCK system software reads out the value from p2003
and saves it in MD $MA_SAFE_BRAKETEST_TORQUE_NORM. For each
additional control boot, MD36969 $MA_SAFE_BRAKETEST_TORQUE_NORM
is checked for changes and where relevant, Alarm 27039 "Axis %1 parame-
terization MD %2[%3] changed, confirmation and functional test required!" is
displayed. MD36969 $MA_SAFE_BRAKETEST_ TORQUE_NORM, is included
in the axis--specific checksum $MA_SAFE_ACT_CHECKSUM[0].
S With simultaneous use of the extended brake control (r0108.14=1) and dynamic
stiffness control control (MD32640 $MA_STIFFNESS_CONTROL_ENABLE=1),
the factory setting p1152=r0899.15 must be changed ("disconnected"), and
p1152 must be set to 1.
© Siemens AG 2015 All Rights Reserved
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) - - 10.2015 Edition
Connecting Sensors/Actuators
7.6 Safe Brake Test (SBT)
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