Blocking Protection, Leakage Protection And Dry-Running Protection - Siemens SINAMICS G120XA Operating Instructions Manual

6.7.6.5

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 (p2193 = 4), the converter detects the following states of the driven
load:
● Blocked
● Leakage
● Dry running
For applications with fans or compressors (p2193 = 5), 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 G120XA converter
Operating Instructions, 03/2019, FW V1.0, A5E44751205B AB
Blocking protection (Page 313)
Advanced commissioning
6.7 Drive protection
315