Siemens SINAMICS G115D

7.27.4 Blocking protection, leakage protection and dry-running protection
Overview
In applications with fans, pumps or compressors with the 󹪞ow characteristic, the torque
follows the speed according to a speci󹪝c characteristic. An insu󹪟cient torque for fans
indicates that the power transmission from the motor to the load is interrupted. For pumps,
insu󹪟cient torque can indicate a leakage or dry-running.
Function description
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%ORFNHG%ORFNHG
If the torque and speed lie in the impermissible range longer than time p2192, the converter
reacts as speci󹪝ed 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.
No-load monitoring (Page327)
Advanced commissioning
7.27Monitoring the driven load
SINAMICS G115D Wall Mounted distributed drive
Operating Instructions, 07/2023, FW V4.7 SP14, A5E52808211A AA 331