Block Protection - Siemens SINAMICS S120 Function Manual

Monitoring and protective functions

8.3 Block protection

8.3 Block protection
Description
The fault message "Motor blocked" is only triggered if the speed of the drive is below the
variable speed threshold set in p2175. With vector control, it must also be ensured that the
speed controller is at the limit. With V/f control, the current limit must already have been
reached.
Once the ON delay (p2177) has elapsed, the message "Motor blocked" and fault F7900 are
generated.
Figure 8-1
Function diagrams (see SINAMICS S120/S150 List Manual)
● 8012 Torque messages, motor blocked/stalled
Overview of important parameters (see SINAMICS S120/S150 List Manual)
● p2175 Motor blocked speed threshold
● p2177 Motor blocked delay time
350
Block protection
Function Manual, (FH1), 10/2008, 6SL3097-2AB00-0BP5
Drive functions