6.31.4 Torque monitoring
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.
The inverter monitors the torque based on the envelope curve depending on the speed against
a lower and upper torque.
6SHHG>USP@
SVSHHGWKUHVKROG6SHHGWKUHVKROGS
6SHHGWKUHVKROGSSPD[LPXPVSHHG
7RUTXHWKUHVKROGORZHUS
7RUTXHWKUHVKROGXSSHUS
7RUTXHWKUHVKROGORZHUS
7RUTXHWKUHVKROGXSSHUS
7RUTXHWKUHVKROGORZHUS
7RUTXHWKUHVKROGXSSHUS
7RUTXH>1P@
If the torque lies in the impermissible range longer than time p2192, the inverter reacts as
specified in p2181.
The monitoring is not active below speed threshold 1 and above speed threshold 3.
Parameters Description
p2181 Load monitoring response
1: A07920 for torque too low
2: A07921 for torque too high
3: A07922 for torque outside tolerance
4: F07923 for torque too low
5: F07924 for torque too high
6: F07925 for torque outside tolerance
p2182 Load monitoring speed threshold 1 The inverter interpolates line‐
arly between characteristic
points.
p2183 Load monitoring speed threshold 2
p2184 Load monitoring speed threshold 3
p2185 Load monitoring torque threshold 1, upper
p2186 Load monitoring torque threshold 1, lower
p2187 Load monitoring torque threshold 2, upper
p2188 Load monitoring torque threshold 2, lower
p2189 Load monitoring torque threshold 3, upper
p2190 Load monitoring torque threshold 3, lower
p2192 Load monitoring delay time
Delay time for the message "Leave torque monitoring tolerance band"
p2193 = 1 Load monitoring configuration (factory setting: 1)
1: Monitoring torque and load drop
Advanced commissioning
6.31 Monitoring the driven load
Converter with the CU230P-2 Control Units
336 Operating Instructions, 09/2017, FW V4.7 SP9, A5E34257946B AE
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