Activating; Example - Siemens SINUMERIK 840D sl Function Manual

03.06
7.4.5

Activating

The brake test must always be started when the axis is at a standstill. For the en-
tire duration of the brake test, the enable signals of the parameterized axis must be
set to enable (e.g. the controller inhibit, feed enable signals). The signal "PLC-con-
trolled axis" (DB "Axis".DBX28.7) must still be set to 1 by the user program for the
entire duration of the test. Prior to activating the signal "PLC controlled axis", the
axis must be set as "neutral axis", e.g. set byte 8 in the axis DB to channel 0. Set
the activating signal in the same byte. The block may not be started until the NC
feedback signal has been received via the appropriate bit (DB "Axis".DBX63.1).
For a PLC-monitored axis, also see:
References:
Warning
!
The brake test must be carried-out before carrying-out the test stop. If the brake
test was not successful (i.e. the brake cannot hold the axis), then it is not
permissible that the test stop is carried-out. Users must carefully take this into
consideration when configuring the brake test and test stop.
7.4.6

Example

An example of incorrect parameterization that results in Alarm 20095, "Axis %1
impermissible holding torque, measured torque %2" is shown in the following dia-
gram: The torque due to weight in drive parameter p1532 has been parameterized
considerably lower than the measured torque m
m , positioned symmetrically around this MD, would mean that the drive would
FXS
not be able to produce the required holding torque for this axis (p1532+m
lower than m
© Siemens AG, 2006. All rights reserved
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 03.2006 Edition
/FB2/ P2 "Autonomous single-axis processes"
).
Act
Connecting Sensors/Actuators
7.4 Safe brake test (SBT)
. The calculated torque limit
Act
is
FXS
7-233