Advanced commissioning
6.21 Monitoring the driven load
Converter with the control units CU240D-2
Operating Instructions, 04/2018, FW V4.9 SP10, A5E34262100B AF
235
6.21.5
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.
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
linearly between characteris-
tic 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
