Operating Instructions

6.30.5 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.
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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.
Blocking protection (Page 342)
Parameter Description
p2165 Load monitoring blocking monitoring threshold, upper
p2168 Load monitoring blocking monitoring torque threshold
Advanced commissioning
6.30 Monitoring the driven load
Converter with the CU230P-2 Control Units
344 Operating Instructions, 04/2018, FW V4.7 SP10, A5E34257946B AF