·The centrifugal fan suddenly vibrates strongly and has exceeded the tripping value.
· There is scratching or abnormal friction sound inside the body.
· There is smoke from any bearing or seal, or the temperature of a certain bearing rises sharply to the alarm value.
·When the oil pressure is lower than the alarm value and cannot return to normal.
·The liquid level of the oil tank is low, and there has been a suction phenomenon. the
·The axis displacement value has obvious continuous growth and reaches the alarm value.
