３ INTERNAL CONNECTION
ＭＵＸ-１００ SERVICE MANUAL ３ - ８
３-２-６ Main inverter unit, filament heating inverter unit and starter circuit
Related PCB: INVERTER UNIT PCB
Ⅰ
Main inverter unit
ⅰ This inverter unit generates high voltage, and is equipped with the IGBT and the gate drive circuit.
The gate drive signal comes from the XCONT PCB.
Ⅱ
Filament heating inverter unit
ⅰ This inverter unit heats the filament, and is equipped with the FET and the gate drive circuit.
The gate drive signal comes from the XCONT PCB.
Besides the inverter, a part of the primary current detection unit is mounted also.(The current transformer
CT1 etc.)
(Reference) Because a part of the current detection unit is mounted, it is required to confirm adjustment of
the FVR value (preset value of filament current) if the entire INVERTER PCB is replaced for
replacement of the IGBT.
Ⅲ
Starter circuit
ⅰ The starter power is turned on/off by the inverter on the MUX CHARGE-04B PCB.
The starter circuit on INVERTER UNIT PCB detects the stator coil current and inserts a phase
advancing capacitor.
(Reference) In case of MUX-100 series including MUX-100D/100H series, if the dip switch SW1-1 on
INVERTER UNIT PCB is ON, the STON signal may not be able to turn ON due to the
interference with the SSR Q10.
So, SW1-1 should be set to OFF(“MUX-100” side).
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