11 Heater Current Too Low MP4000

Description

Heater Current Too Low 

• Occurs during pretrip (PTI) or function test only. 
• Heater power consumption is 25% below expected current draw or phase current level differs 33% or more. 
• If both alarm #10 and #11 is active this indicates too high phase difference. 
• Expected heater current is a function of the heating element resistance and the power supply voltage. 
•  The Magnum+ may be equipped with extended heating capability. 
• Normal heating element 4kw@460VAC 
• - below approximately 3,7Amp / 3,2Amp. 
• Extended heating element 6kw@460VAC 
• - below approximately 5,6Amp / 4,8Amp. 
• Indicates: 
• Incorrect heaters or heater connections. 
• Defective heating element. 
• Defective volt or amp meter on power module.

Corrective Action 

• Enter Manual Function Test and turn heaters on. Check current draw on each phase. Evaluate current draw in relation to expected values. 
• Enter configuration menu and check the heating element setting. 
• Check heater resistance. 
• The electrical resistance towards chassis must be above meg ohm (MΩ) range. 
• Normal heating element 4kw@460VAC 
• - expects 5,0Amp@460VAC 
• - expects 4,3Amp@400VAC 
• - expected resistance 99Ω on each leg. 
• Extended heating element 6kw@460VAC 
• - expects 7,5Amp@460VAC 
• - expects 6,5Amp@400VAC 
• - expected resistance 66Ω on each leg.