Kemppi miniarc 140 Troubleshooting Manual Manual pdf 19 page image
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Kemppi miniarc 140 Troubleshooting Manual

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Contents
  1. troubleshooting guide
  2. Table Of Contents
  3. Technical data
  4. Main circuit
  5. Troubleshooting chart
  6. Main circuit diagrams
  7. Functional tests/measurings
  8. Measuring points
  9. Voltage after secondary rectifier
  10. IGBT gate pulse
  12. Control card A001 connectors
  13. Control card A001 layout
  15. IGBT-transistor testing
  16. Service infos
  18. Notes
Kemppi miniarc 140 Troubleshooting Manual Manual pdf 19 page image
Service infos03 / 2002 IGBT gate resistors and intermediate circuit charging relayPower sourcesMinarc 110 & 140ModificationIGBT gate resistors (10 ohm.) have been added to the spare part set (4297750).Reason for modificationIf the IGBTs are damaged, also the gate resistors (R2, R4, R5, R6, R7 and R8) may be damaged.For example if one resistor has been destroyed, then the IGBT doesn´t get gate control and thiscauses overload to the other IGBTs. When IGBTs are replaced then the gate resistors must bechecked too. See the attached picture.DC-link(Intermediate circuit) charging relay K1 (9766230)If fan rotating speed drops after the machine starts and the OCV is max. 85 volts, then mostlikely the DC-link charging relay is not working. In some cases there has been lacquer insidethe relay and it is stuck. Relay control voltage is approx. +28 volts.19
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This manual is suitable for:
miniarc 110miniarc 140
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