137 Sensor System Overload MP4000

Description 

Sensor System Overload 

• The controller sensor measurement is overloaded. 
• This situation will probably introduce wrong readings at other sensors than the one introducing the overload. 
• Indicates: 
• Not intended voltage is introduced at one of the sensor inputs. 
• Transducer, connection or cabling with voltage supply for the sensor might short circuit this voltage supply onto the measuring input. 

Corrective Action 

• Sensor input which might initiate the problem: 
• At connector J3: 
• Humidity sensor (4-20mA type) pin 15-16. 
• At connector J1: 
• AVL position pin 1-3. 
• Discharge pressure pin 4-6. 
• Suction pressure pin 7-9. 
• At least one of the sensors circuits holds a short between sensor voltage and sensor signal. 
• Problem might be located any were from the connection to the sensor itself. 
• Action: 
• Disconnect sensors and look for a non intended short between sensor voltage and the sensor line. 
• The sensor with the problem might show up with its own alarm.