Reason

(1) Sensor is disconnected.

(2) Sensor cable is disconnected or its sheath is broken.

(3) The sensitivity of the sensor is wrong.

Solution

(1) Check the condition of the sensor.

(2) Replace the sensor cable.

(3) Check the sensor sensitivity.

　If the sensor sensitivity × acceleration exceeds 10000, change the sensor sensitivity from 10 mV/pC to 1 mV/pC.