Blocking Protection, Leakage Protection And Dry-Running Protection - Siemens SINAMICS G115D Operating Instructions Manual

6.24.4

Blocking protection, leakage protection and dry-running protection

Overview
In applications with fans, pumps or compressors with the flow characteristic, the torque
follows the speed according to a specific characteristic. An insufficient torque for fans
indicates that the power transmission from the motor to the load is interrupted. For pumps,
insufficient torque can indicate a leakage or dry-running.
Function description
If the torque and speed lie in the impermissible range longer than time p2192, the converter
reacts as specified in p2181.
For applications with pumps, the converter detects the following states of the driven load:
• Blocked
• Leakage
• Dry running
For applications with fans or compressors, the converter detects the following states of the
driven load:
• Blocked
• Torn belt
The monitoring is not active below speed threshold 1 and above speed threshold 3.
When using the control mode "U/f control" (p1300 < 10), the "Blocking protection" function
becomes active when the current limit is reached.
SINAMICS G115D distributed drive
Operating Instructions, 09/2020, FW V4.7 SP13, A5E48681219B
No-load monitoring (Page 265)
Advanced commissioning
6.24 Monitoring the driven load
269