Danfoss VLT AQUA Drive FC 202 Design Manual page 42

Introduction Design Guide
Summary
With the torque limit feature, the motor is protected from
being overloaded independent of the speed. With the ETR
2 2
the motor is protected for being over heated and there is
no need for any further motor protection. That means
when the motor is heated up the ETR timer controls for
how long time the motor can be running at the high
temperature before it is stopped in order to prevent over
heating. If the motor is overloaded without reaching the
temperature where the ETR shuts off the motor, the torque
limit is protecting the motor and application for being
overloaded.
ETR is activated in 1-90 Motor Thermal Protection and is
controlled in 4-16 Torque Limit Motor Mode. The time
before the torque limit warning trips the frequency
converter is set in 14-25 Trip Delay at Torque Limit.
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