17 Condenser Fan Current Too Low MP4000

Description 

Condenser Fan Current Too Low 

• Occurs during pretrip (PTI) or function test only. 
• Fan power consumption is 33% below expected current draw or phase current level differs 33% or more. 
• If both alarm #16 and #17 is active this indicates too high phase difference. 
• Expected fan current is a function of the power line frequency and the supply voltage. 
• Above approximately 
• - 0,5Amp@400VAC/50Hz 
• - 0,6Amp@460VAC/60Hz 
• Indicates: 
• Defective condenser fan motor relay. 
• Incorrect motor or motor connections. 
• Defective or open fan motor internal over temperature protection switch. 
• Defective volt or amp meter on power module. 

Corrective Action 

• Enter Manual Function Test and start condenser fan. Make sure the fan starts. 
• Check fan motor volts and amps. 
• Expect 
• - 1,0Amp@400VAC/50Hz 
• - 1,2Amp@460VAC/60Hz