Encoder Limit Frequency - Siemens SINUMERIK 840D sl Function Manual

Basics on the Safety Functions Integrated in the System/Drive
5.4 Actual value conditioning
Limitations
The two SI actual positions no longer display the correct absolute machine posi-
tion. The correct position can now only be read out via the NC actual position.
The safety monitoring functions SG, SBH, SBR and "n<n
actual value changes from the particular actual value acquisition channel – not to
changes in the actual value resulting from the actual value synchronization. A
single–channel SG violation only initiates an alarm in the channel in which this
speed violation was detected. The associated stop response is therefore still initi-
ated through two channels.
SGA "n<n
Note
It is not possible to activate the safe SE and SN functions for an axis/spindle
where slip can occur between the motor and the load.
Activating
The actual value synchronization is selected by setting bit 3 in machine data
36901: $MA_SAFE_FUNCTION_ENABLE or parameter p9501:" SI motion, enable
safety–related functions". In addition, SI function "SBH/SG monitoring" must also
be enabled.
Actual value synchronization is only permissible if a monitoring function with abso-
lute reference has not been enabled. If SE and/or SN are also selected, power on
Alarms 27033 and F01688 are also output when booting.
The actual value synchronization is only permissible for 2–encoder systems. If this
function is enabled for a single–encoder system, Alarm 27033/F01688 is output.
5.4.7

Encoder limit frequency

For safety–related operation, it is not permissible that the encoder limit frequency
of 500 kHz exceeded.
For this purposes, Safety Integrated monitors for the encoder limit frequency being
exceeded depending on the situation (depending on the context); when the en-
coder limit frequency is exceeded, an appropriate alarm is output (refer to Chapter
6.5 "Safely reduced speed")
5-108
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 05.2008 Edition
" can also assume different static states in the two monitoring channels.
x
" still only respond to
x
© Siemens AG 2008 All Rights Reserved
05.08