Siemens SINAMICS G120 Instructions d'exploitation télécharger pdf (Page 213)

Functions

7.9 Application-specific functions

Inverter with CU240B-2 and CU240E-2 Control Units

Operating Instructions, 01/2011, FW 4.4, A5E02299792B AB

211

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

torque. For example, in fans and conveyor belts too low a torque indicates that the drive

belt is torn.

● Applications that are to be protected against overload or locking (e.g. extruders or

mixers).

● Applications in which no-load operation of the motor represents an impermissible

situation (e.g. pumps).

Load torque monitoring functions

The converter monitors the torque of the motor in different ways:

1. No-load monitoring:

The converter generates a message if the motor torque is too low.

2. Blocking protection:

The converter generates a message if the motor speed cannot match the speed setpoint

despite maximum torque.

3. Stall protection:

The converter generates a message if the converter control has lost the orientation of the

motor.

4. Speed-dependent torque monitoring

The converter measures the actual torque and compares it with a parameterized

speed/torque characteristic.

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Siemens SINAMICS G120 Instructions d'exploitation Page 213