This feature prevents motor burn out from overdrive under all circumstances. The SST servo drive calculates the true RMS current in the motor and shuts down the drive when a user-definable limit is exceeded. This method will not be fooled by oscillation or miswired sensors like other protection methods (such as the common current-time (I-T) alarm).
In fact, true RMS torque protection is actually more reliable than a motor thermostat because it operates more rapidly and isn’t limited to one physical measurement point. (The SST does, however, support a thermostat input if you should desire to use one).
This feature allows you to build more reliable machines that also use nearly the full capability of the motor. In general, combined with the IMT, this feature allows you to use smaller motors than competing servo solutions, giving you more design flexibility.