Torque Monitoring - Siemens SINAMICS G120 Operating Instructions Manual

6.25.4

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.
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
p2181
p2182
p2183
p2184
p2185
p2186
p2187
p2188
p2189
p2190
p2192
p2193 = 1
Converter with the CU240B-2 and CU240E-2 Control Units
Operating Instructions, 01/2017, FW V4.7 SP6, A5E34259001B AD
Description
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
Load monitoring speed threshold 1
Load monitoring speed threshold 2
Load monitoring speed threshold 3
Load monitoring torque threshold 1, upper
Load monitoring torque threshold 1, lower
Load monitoring torque threshold 2, upper
Load monitoring torque threshold 2, lower
Load monitoring torque threshold 3, upper
Load monitoring torque threshold 3, lower
Load monitoring delay time
Delay time for the message "Leave torque monitoring tolerance band"
Load monitoring configuration (factory setting: 1)
1: Monitoring torque and load drop
Advanced commissioning
6.25 Monitoring the driven load
The inverter interpolates line‐
arly between characteristic
points.
327