Siemens SINUMERIK 840D sl Function Manual page 254

Connecting Sensors/Actuators
7.4 Safe brake test (SBT)
Torque limits
The torque limits p1520[0] and p1521[0] and the reference torque p2003 are pre–
assigned when commissioning the motor. The torque limits and the reference
torque are pre–assigned differently depending on the technological application
p0500 and dependent on the hardware components being used.
Further, the torque limits p1522[0] and p1523[0] are pre–assigned as follows:
p1522[0] 63:2902:5 reference to +100% referred to p2003 in the same Motor
Module
p1523[0] 63:2902:12 reference to –100% referred to p2003 in the same Motor
Module
When using the safe brake test, these pre–assignments for p1522[0]/p1523[0] may
not be changed.
However, when upgrading the software, the following setting, which is also permissible,
can be present:
p1522[0] 0:1.0 100% of p2003
p1523[0] 63:2900.0 reference to p2900 in the same Motor Module
p2900[0] –100% –100% from p2003
To ensure that the brake test functions without any errors, it should be checked as to
whether the required test torque in MD 36966 $MA_SAFE_BRAKETEST_TORQUE is not
prevented from being generated due to the fact that torque limits are effective in the drive.
For details on this, please see SINAMICS List Manual, e.g. function charts 5610 and 5620.
For instance, the selectable torque limits from p1520/p1521 and p1522/p1523 may
not be set so low that the required torque cannot be established for the brake test.
When required, p1520/p1521 or p2003 should be adapted. When making a change
to p2003, machine data 36966 should be re–determined.
Further, e.g. the following parameters can also have a limiting effect:
p1530/p1531 (power limit, motoring/regenerating)
p0640 (current limit)
p0326 (stall torque correction factor)
7-254
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 05.2008 Edition
© Siemens AG 2008 All Rights Reserved
05.08