Setting functions
8.8 Application-specific functions
Converter with control units CU250D-2
232 Operating Instructions, 04/2014, FW V4.7, A5E34261542B AA
Monitoring the load torque (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 with 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 inverter monitors the motor torque in different ways:
● No-load monitoring
The inverter generates a message if the motor torque is too low.
● Blocking protection:
The inverter generates a message if the motor speed cannot track the speed setpoint
despite generating maximum torque.
● Stall protection
The inverter generates a message if the motor stalls and no longer generates a torque.
● Speed-dependent torque monitoring
The inverter measures the actual torque and compares it with a set speed/torque
characteristic.
Figure 8-44 Load torque monitoring
To Next Page
Loading...
