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====Reason for R7 burn====
 
====Reason for R7 burn====
 
*R7 will burn (open circuit) if there is malfunction in relay RL2 (relay stuck in off-state).
 
*R7 will burn (open circuit) if there is malfunction in relay RL2 (relay stuck in off-state).
*R7 will burn open if power is consumed from HV DC bus while relay RL2 is open (so drive tries to charge capacitor bank through this resistor without but voltage does not rise). This is possible if something is drawing power from VP and/or VN terminals. This could be another drive shared in the same bus, or for example a loose wire strand shorting wrong terminals in J4 connector.
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*R7 will burn open if power is consumed from HV DC bus while relay RL2 is open (so drive tries to charge capacitor bank through this resistor). This is possible if something is drawing power from VP and/or VN terminals. This could be another drive shared in the same bus, or for example a loose wire strand shorting wrong terminals in J4 connector.
 
*Another causes might be a damaged power stage or regenerative drive (some transistors short circuited) of drive, which also would load HV DC bus continuously. To identify if this has happened, see [[Determining Argon hardware failure]].
 
*Another causes might be a damaged power stage or regenerative drive (some transistors short circuited) of drive, which also would load HV DC bus continuously. To identify if this has happened, see [[Determining Argon hardware failure]].
  
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Measuring condition of B3 is possible with multimeter's diode check function. Check all four diodes from the test points marked in the image. Multimeter red lead goes to anode and black to cathode. All diodes should give reading of 0.4 to 0.5 Volts.
 
Measuring condition of B3 is possible with multimeter's diode check function. Check all four diodes from the test points marked in the image. Multimeter red lead goes to anode and black to cathode. All diodes should give reading of 0.4 to 0.5 Volts.
 
[[File:Argondiodebridge.jpg|thumb|Diode bridge B3 measurement points circled]]
 
[[File:Argondiodebridge.jpg|thumb|Diode bridge B3 measurement points circled]]
 
[[Category:Argon]]
 
[[Category:Argon_troubleshooting]]
 

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