Editing Argon supply voltage troubleshooting
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===Inrush current limiter resistor R7=== | ===Inrush current limiter resistor R7=== | ||
− | R7 is a 5W | + | R7 is a 5W 33 ohm resitor that conducts current to charge bulk capacitors. After capacitors are charged to full, relay RL2 is closed to allow high current flows. Failure reasons: |
+ | *R7 will burn (open circuit) if there is malfunction in relay RL2 (relay stuck in off-state). | ||
+ | *R7 will also burn open if something is loading HV DC bus (lines VN to VP) when drive is idle (relay is off-state) | ||
− | Resistance of R7 can be measured with multimeter from test points marked in the image. The correct reading is | + | Resistance of R7 can be measured with multimeter from test points marked in the image. The correct reading is 33 ohm +/- 2 ohm. It is possible to replace (desolder and solder) new resistor without removing heatsink from the PCB by approaching PCB from the side of the board. |
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[[File:Argoninrushlimiter.jpg|thumb|Resistor R7 measurement points inside Argon]] | [[File:Argoninrushlimiter.jpg|thumb|Resistor R7 measurement points inside Argon]] | ||
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===AC/DC rectifier bridge B3=== | ===AC/DC rectifier bridge B3=== | ||
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]] | ||
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