3 Safety-Related Functions
11.03
3.5 Safely-reduced speed (SG)
© Siemens AG 2003 All Rights Reserved
3-100
SINUMERIK 840D/SIMODRIVE 611 digital SINUMERIK Safety Integrated (FBSI) - Edition 11.03
SG-specific stop responses can be set using the following machine data:
For 840D
MD 36963:
$MA_SAFE_VELO_STOP_REACTION
[
n
]
(SG-specific
stop
response)
For 611 digital
MD 1363:
$MD_SAFE_VELO_STOP_REACTION
[
n
]
3.5.6
Override for safely-reduced speed
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
MD 36932: $MA_SAFE_VELO_OVR_FACTOR[n]
(override factor safely-reduced speed)
For 611 digital
MD 1332: $MD_SAFE_VELO_OVR_FACTOR
[
n
]
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:
•
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.
SG override values are changed over subject to the same conditions as those
applied to speed limit values.
Table 3-25
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.
Setting the
configurable
SG-specific stop
responses
General
Application
Activating
Changing-over
between SG overrides
