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

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Safety functions integrated in the system/drive

6.5 Safely reduced speed (SG)

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

Standards. For example, the following could be specified for the setting--up mode:

Safely reduced speed with 2 m/min for feed drives and

50 rpm for spindle drives or standstill within 2 revolutions.

The machine manufacturer must parameterize SI in such a way as to ensure full

compliance with the EC Machinery Directive. The relevant standards provide the

necessary guidelines and support.

Quantities that influence the parameterization include, e.g. the drive dynamic

response, the set parameters with their delay times, electrical and mechanical gear

ratios and all of the mechanical properties and characteristics. The interrelation-

ships between the drive dynamic response and internal delay times of SI are

shown in Fig. 6-14 "Timing when exceeding the limit value for SG".

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.

Monitoring against a limit frequency of 500 kHz is not performed for DRIVE--CLiQ

SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) - - 10.2015 Edition

Sinamics s120