121 Discharge Pressure Sensor Error MP4000

Description 

Discharge Pressure Sensor Error 

• Occurs during Normal Run if the sensor is detected to be out of range, open or short circuit. 
• Occurs during pretrip (PTI) test if the sensor readings do not act correct during compressor activity. 
• Expected to increase 0,15Bar from stopped to compressor running loaded. 
• Indicates: 
• Wrong location of the sensor. 
• Sensor failure. 

Corrective Action 

• Using DATA menu evaluate sensor readings. 
• Check wiring to be correct and connected. 
• Check J1plug is plugged into MRB. 
• Check voltage at J1 pin4 to be 0.5 – 4.5 VDC. 
• Replace sensor.