Load Torque Monitoring (System Protection) - Siemens SINAMICS G120 CU230P-2 HVAC Operating Instructions Manual

Functions
7.9 Application-specific functions
7.9.5

Load torque monitoring (system protection)

In many applications, it is advisable to monitor the motor torque:
● Applications where the load speed can be indirectly monitored by means of the load
● Applications that are to be protected against overload or locking (e.g. extruders or
● Applications in which no-load operation of the motor represents an impermissible
Load torque monitoring functions
The converter monitors the torque of the motor in different ways:
1. No-load monitoring:
2. Blocking protection:
3. Stall protection:
4. Speed-dependent torque monitoring
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torque. For example, in fans and conveyor belts too low a torque indicates that the drive
belt is torn.
mixers).
situation (e.g. pumps).
The converter generates a message if the motor torque is too low.
The converter generates a message if the motor speed cannot match the speed setpoint
despite maximum torque.
The converter generates a message if the converter control has lost the orientation of the
motor.
The converter measures the actual torque and compares it with a parameterized
speed/torque characteristic.
Frequency inverters with Control Units CU230P-2 HVAC, CU230P-2 DP, CU230P-2 CAN
Operating Instructions, 01/2011, FW 4.4, A5E02430659B AD