6.8.6.5
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
6SHHG>USP@
SVSHHGWKUHVKROG
6SHHGWKUHVKROGS
6SHHGWKUHVKROGS
SPD[LPXPVSHHG
7RUTXHWKUHVKROGQRORDGS
7RUTXHWKUHVKROGORZHUS
7RUTXHWKUHVKROGORZHUS
7RUTXHWKUHVKROGORZHUS
%ORFNLQJPRQLWRULQJWKUHVKROGS
%ORFNLQJPRQLWRULQJS
7RUTXH>1P@
'U\UXQQLQJSURWHFWLRQRU
EURNHQEHOW
'U\UXQQLQJSURWHFWLRQRU
EURNHQEHOW
/HDNDJHSXPSV
/HDNDJHSXPSV
%ORFNHG
%ORFNHG
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.
Blocking protection (Page 418)
Advanced commissioning
6.8 Drive protection
SINAMICS G120X converter
420
Operating Instructions, 06/2019, FW V1.01, A5E44751209B AC