Override For Safely-Reduced Speed - Siemens SINUMERIK 840D Description Of Functions

3 Safety-Related Functions
3.5 Safely-reduced speed (SG)
Setting the SG-specific stop responses can be set using the following machine data:
configurable
For 840D
SG-specific stop
responses
For 611 digital
3.5.6

Override for safely-reduced speed

General Using SGEs it is possible to specify 16 SG override stages for the limit values
of safely-reduced speeds 2 and 4. This allows the limit values for SG2 and SG4
to be monitored in finer steps.
An override stage can be assigned factors of between 1 and 100% using the
following machine data:
For 840D
For 611 digital
Application For grinding applications, the limit value for the safely-reduced speed can be
adjusted to the variations in the grinding wheel peripheral speed by means of
the SG override.
The following prerequisites must be fulfilled before the function can be used:
Activating
•
•
•
•
•
Changing-over SG override values are changed over subject to the same conditions as those
between SG overrides applied to speed limit values.
Table 3-25
3-100
SINUMERIK 840D/SIMODRIVE 611 digital SINUMERIK Safety Integrated (FBSI) - Edition 11.03
MD 36963:
MD 1363:
MD 36932: $MA_SAFE_VELO_OVR_FACTOR[n]
(override factor safely-reduced speed)
MD 1332: $MD_SAFE_VELO_OVR_FACTOR [ n ]
Function is enabled via MD 36901(MD 1301):
$MA($MD)_SAFE_FUNCTION_ENABLE, bit 5
The "SBH/SG" monitoring function is enabled
The required SGEs "SG override selection, bits 3, 2, 1, 0" are fully or
partially configured
SG override factors have been set in the corresponding machine data
Safely-reduced speed 2 or 4 is activated.
Changing over SG override values
Changeover Description
from lower to higher Instantaneous
from higher to lower A delay timer parameterized in MD 36951/MD 1351 is
started. The axis/spindle must be braked within this delay
time.
Note: Refer to Chapter 3.5.1, "Selection/de-selection of safely-reduced speed"
Note
Changing between SGEs "SG override selection, bits 3, 2, 1, 0" continuously
and quickly may initiate STOP F.
$MA_SAFE_VELO_STOP_REACTION [ n ]
(SG-specific stop response)
$MD_SAFE_VELO_STOP_REACTION [ n ]
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11.03