Load Torque Monitoring - Siemens Sinamics G120 CU240E Operating Instructions Manual

Functions
5.8 Motor and inverter protection
5.8.4

Load torque monitoring

Applications with load torque monitoring
In many applications, it is advisable to monitor the motor torque:
● Applications in which the mechanical connection between the motor and load may be
● Applications that are to be protected against overload or locking (e.g. extruders or
● Applications in which no-load operation of the motor represents a critical situation (e.g.
Load torque monitoring functions
The inverter monitors the torque of the motor in different ways:
1. No-load monitoring:
2. Lock protection:
3. Stall protection:
4. Frequency-dependent torque monitoring:
122
interrupted (e.g. if the drive belt in fan or conveyor belt systems tears).
mixers).
pumps).
The inverter generates a message if the motor torque is too low.
The inverter generates a message if the motor speed cannot match the speed setpoint
despite maximum torque.
The inverter generates a message if the inverter controller has lost the orientation of the
motor.
The inverter measures the current torque and compares it with a parameterized
frequency/torque characteristic.
Frequency inverter
Operating Instructions, 08.10. 2008, t.b.d.