Siemens SINAMICS G120XA, Operating Instructions Manual

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Functions for monitoring the driven load
The converter provides the following means to monitor the driven load via the torque of the
motor:
0
Q
The stall protection recognizes a stalled asynchronous motor.
The no-load monitoring evaluates the motor current. Insufficient current indicates
that the motor and the load are no longer mechanically connected with each other.
The blocking protection triggers for a motor current that corresponds to the set
current limit coupled with motor standstill.
The torque monitoring assumes that a specific torque is associated with each
speed for pumps and fans. Insufficient torque indicates that the motor and the load
are no longer mechanically connected.
An excessive torque can indicate problems in the mechanical system of the driven
load, e.g. a mechanically blocked load.
Blocking protection, leakage protection and dry-running protection are a monitor‐
ing method for pumps or fans. The monitoring combines a torque monitoring with
a blocking protection.
Monitoring the driven load with a binary signal:
The speed monitoring evaluates a periodic binary signal. A signal failure indicates
that the motor and the load are no longer mechanically connected with each other.
Advanced commissioning
6.7 Drive protection
SINAMICS G120XA converter
Operating Instructions, 03/2019, FW V1.0, A5E44751205B AB
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