Blocking Protection, Leakage Protection And Dry-Running Protection - Siemens SINAMICS G120 Operating Instructions Manual

6.31.5

Blocking protection, leakage protection and dry-running protection

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.
If the torque and speed lie in the impermissible range longer than time p2192, the inverter
reacts as specified in p2181.
For applications with pumps (p2193 = 4), the inverter detects the following states of the driven
load:
● Blocked
● Leakage
● Dry running
For applications with fans or compressors (p2193 = 5), the inverter 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.
Parameter
p2165
p2168
Converter with the CU230P-2 Control Units
Operating Instructions, 09/2017, FW V4.7 SP9, A5E34257946B AE
Stall protection (Page 335)
Description
Load monitoring blocking monitoring threshold, upper
Load monitoring blocking monitoring torque threshold
Advanced commissioning
6.31 Monitoring the driven load
337