Mitsubishi Heavy Industries MHI FDU71VNXVF1 Technical Manual page 127

(iii) Models FDC100VSX, 125VSX, 140VSX
1) Replace the PCB after elapsing 3 minutes from power OFF.
(Be sure to measure voltage (DC) on both capacitor terminals located in controller back, and check that the
voltage is discharged sufficiently. (Refer to Fig.1))
2) Take off the connection of inverter PCB terminal block connector and remove the screw of power transistor then
remove the PCB. Wipe off the silicon grease neatly on the controller's radiation heat fins.
3) Match the setting switches (JSW10,11) of new PCB with the former PCB.
4) Before installing the power transistor on the new PCB, Apply uniformly a bundled of silicon grease first on
the surface of power transistor. Make sure it is applied to prevent damage on power transistor.
5) Tighten the screw of power transistor on inverter PCB and connect the terminal block. Confirm the connection and
don't use soldering in the connection.Tighten properly the power transistor with a screw and make sure there
is no slack. Power transistor can be damage if not properly tighten. (Recommended power transistor
tightening torque:0.98~1.47N∙m)
CNO1
CNW1
Terminal
block
TB6
TB5
TB9
TB8
TB7
Parts arrangement view
JSW10
Parts No.
CNW2
Connector
CNI2
Table. 1 Switch setting
-1 OFF
-2 OFF
-3 OFF
-4 OFF
-
CNR
Switch
JSW11
JSW10
Fig.1 Position of capacitor
-1
-2
JSW11
-3
-4
126
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'12 • PAC-T-178
PCA012D025F
Voltage measurement parts
ON
OFF
ON
ON
F