System Protection - Siemens SINAMICS G120 Operating Instructions Manual

6.7.10

System protection

In many applications, monitoring the motor speed and torque provides information about the
plant or system status. By setting the appropriate responses in the case of faults, failures
and damage to the plant or system can be avoided.
Examples:
● For fans or conveyor belts, an excessively low torque can mean a broken drive belt.
● For pumps, an excessively low torque down to zero speed can mean an inadmissible
operating state.
● For extruders and mixers, excessively high torque can mean overload or a blocked
machine.
System protection functions
The inverter offers the following options of monitoring the motor load torque and speed:
● No-load monitoring
● Blocking protection
● Stall protection
● Load monitoring
No-load monitoring, blocking protection and stall protection require just a few settings.
However, the load monitoring is a function that offers a wide range of different setting options
– which in turn demands that you have good knowledge of the system.
Converter with the CU240B-2 and CU240E-2 Control Units
Operating Instructions, 01/2016, FW V4.7 SP6, A5E34259001B AC
Advanced commissioning
6.7 Application-specific functions
315