Speed Monitoring, Encoder Limit Frequency - Siemens SINUMERIK 840D sl Function Manual

03.06
Specifying velocities and speeds
The requirements regarding speeds and velocities that are stipulated for individual
processes (milling, turning, grinding, etc.) vary depending on the different C Stan-
dards. For example, the following could be specified for the setting-up mode:
"Safely-reduced speed" with 2m/min for feed drives and 50 RPM for spindle drives
or standstill within 2 revolutions.
The machinery construction OEM must parameterize SI in such a way as to en-
sure full compliance with the EC Machinery Directive. The relevant standards pro-
vide the necessary guidelines and support.
Quantities that influence the parameterization include, e.g. the drive dynamic res-
ponse, the set parameters with their delay times, electrical and mechanical ratios
and all of the mechanical properties and characteristics. The interrelationships be-
tween the drive dynamic response and internal delay times of SI are shown in
Fig. 6-13 "Timing when exceeding the limit value for SG".
6.5.1

Speed monitoring, encoder limit frequency

When SBH/SG is active in a configuration with a 1-encoder, the speed is moni-
tored to ensure that it does not exceed a maximum encoder limit frequency. An
appropriate alarm is output if this limit is exceeded.
Encoder limit frequency
The encoder limit frequency is 500 kHz. When the encoder limit frequency in SG is
exceeded, the SG-specific parameterized stop is initiated.
© Siemens AG, 2006. All rights reserved
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 03.2006 Edition
Safety Functions Integrated in the System/Drive
6.5 Safely-reduced speed (SG)
6-137