Warning /Alarm 18 in danfoss VLT FC360 drive : Start Failed - The speed cannot exceed the value set in parameter 1-78 Compressor Start Max Speed [Hz] during start within the allowed time, which is set in parameter 1-79 Compressor Start Max Time to Trip. The alarm may be caused by a blocked motor.

1. Check if the motor is blocked.
2. Check if the start max speed is set higher than the working speed after ramp up.
3. Check if the start max time to trip is set shorter than the normal ramp up time.