Siemens SINAMICS G220 - Load Monitoring for Torque

14.11.16.4 Load monitoring for torque
Overview
The "Load monitoring for torque" function assumes that a speci󹪝c torque is associated with
each speed for pumps and fans.
Description of function
In applications with fans, pumps or compressors with 󹪞ow characteristic, the torque follows the
speed according to a speci󹪝c characteristic.
A torque that is too low indicates that the motor and load are no longer mechanically
coupled. A torque that is too high can indicate problems in the mechanical system of the
driven load.
The converter monitors the torque for a lower torque value and an upper torque value using
an envelope curve as a function of speed.
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If the torque is in the impermissible range for longer than time p2192, the converter
responds according to the setting p2181.
The monitoring is not active below speed threshold 1 and above speed threshold 3.
Example
In the following examples, a torque that is too high or too low indicates an error in the system:
• For pumps, a torque that is too low can indicate leakage or dry running of the pump.
• For fans, a torque that is too low indicates that the power transmission from the motor to the
load has been interrupted by a broken drive belt.
Parameters
The following list contains the parameters of the "Load monitoring for torque" function.
Number Name Unit
Functions
14.11Drive functions
SINAMICS G220 converter
620 Operating Instructions, 04/2024, FW V6.2, A5E51781573B AB