Err11 in danfoss VLT2800 drive indicates Motor thermistor error. This means the thermistor might be disconnected. The motor is too hot or the thermistor/thermistor connection has been disconnected.

1. In parameter 128 Thermal motor protection the user can select whether the frequency transformer emits a warning or an alarm.
2. Check that the PTC thermistor is correctly connected between terminals 18, 19, 27 or 29 (digital input) and terminal 50 (+ 10 V supply).