Siemens SINUMERIK 840D sl Function Manual page 268

Data Description
8.1 Machine data for SINUMERIK 840D sl
36966
MD number
Default value: 5
Change becomes effective after: Power ON
Data type: DOUBLE
Significance:
corresponds with...
Additional references
36967
MD number
Default value: 1
Change becomes effective after: Power ON
Data type: DOUBLE
Significance:
corresponds with...
Additional references
36968
MD number
Default value: 0
Change becomes effective after: Power ON
Data type: DWORD
Significance:
corresponds with...
Additional references
8-268
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 03.2006 Edition
$MA_SAFE_BRAKETEST_T ORQUE
Holding torque, brake test
Min. input limit: 0
Protection level: 7/2
This MD specifies the torque or force when testing the mechanical brake system. The
holding brake must be capable of applying this torque without the axis starting to slip.
This MD must be at least 10 % above the actual torque when selecting the brake test, i.e.
with the brake open. This guarantees that if the brake is defective, the motor can again
brake the axis. If this is not the case, the brake test is aborted with Alarm 20095. If drive
parameter p1532 is not correctly parameterized and if bit 0 of MD
$MA_SAFE_BRAKETEST_CONTROL is not set, then the required safety margin is
increased by twice the difference between the real torque and the parameterization in
parameter p1532: Torque limit, offset.
MD: 36968: $MA_SAFE_BRAKETEST_CONTROL
Refer to Section 7.4: "Safe brake test (SBT)"
$MA_SAFE_BRAKETEST_POS_T OL
Position tolerance, brake test
Min. input limit: –
Protection level: 7/2
Maximum position tolerance when testing the mechanical brake system.
If the axis position deviates from the position by more than this tolerance, when the brake
test is selected, then the brake test is aborted.
The corresponding test function is enabled using MD $MA_FIXED_STOP_MODE, bit 1
MD: 37000: $MA_FIXED_STOP_MODE
Refer to Section 7.4: "Safe brake test (SBT)"
$MA_SAFE_BRAKETEST_CONTROL
Sequence check for the brake test
Min. input limit: 0
Protection level: 7/2
Sequence check for the brake test.
Bit 0: Select the average value for the torque limiting
0: Drive parameter p1532: Torque limit offset, is used as the average value of the torque
limiting.
1: The measured torque at the instant in time that the brake test is selected is used as the
average value of the torque limit.
Refer to Section 7.4: "Safe brake test (SBT)"
Max. input limit: 800
Units: %
Max. input limit: –
Units: mm/degrees
Max. input limit: 1
Units: –
© Siemens AG, 2006. All rights reserved
03.06