Siemens SINAMICS S120 - Blocking Protection

Monitoring functions and protective functions
9.3 Blocking protection
Drive functions
638 Function Manual, 11/2017, 6SL3097-4AB00-0BP5
9.3
Blocking protection
The "Motor blocked" fault is only output if the speed of the drive is below the adjustable
speed threshold (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 F07900 are
generated.
The enable for blocked motor monitoring can be deactivated using p2144.
Figure 9-1 Blocking protection
Function diagrams (see SINAMICS S120/S150 List Manual)
•
8012
Signals and monitoring functions
- Torque messages, motor locked/stalled
Overview of important parameters (see SINAMICS S120/S150 List Manual)
•
p2144[0...n]
BI: Blocked motor monitoring enable (negated)
•
p2175[0...n]
Motor locked speed threshold
•
p2177[0...n]
Motor locked delay time