Siemens Sinumerik 840D sl Function Manual page 339

10/15
Examples to determine MD36966 $MA_SAFE_BRAKETEST_TORQUE,
p2003=100Nm:
Max. holding torque
M
0max
20Nm = 20 %
30Nm = 30 %
40Nm = 40 %
50Nm = 50 %
60Nm = 60 %
70Nm = 70 %
The "limit value of the actual torque before SBT" shown here, indicates that the
actual torque, automatically determined before the SBT, must not be lower, as
otherwise Alarm 20095 "Axis %1 inadmissible holding torque" is output.
The test results are evaluated
Analysis using servo trace
The signal characteristics must be viewed in order to evaluate the brake test. The
behavior during the brake test can be recorded using the servo trace:
Signal selection
Control deviation
Following error
Torque limit
Torque--generating actual current value i(q)
Measurement parameters
Measurement time: 4000 ms
Trigger: No trigger
© Siemens AG 2015 All Rights Reserved
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) - - 10.2015 Edition
Test torque
r1509 M =M
T
26 %
39 %
52 %
65 %
78 %
91 %
Connecting Sensors/Actuators
7.6 Safe Brake Test (SBT)
Actual torque limit before
+ 30 %
0max
22.1 %
33.15 %
44.2 %
55.3 %
66.3 %
77.4 %
SBT M *0.85
T
7-339