Mitsubishi Heavy Industries MHI FDU71VNXVF1 Technical Manual page 126

(ii) Models FDC100VNX, 125VNX, 140VNX
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)
Terminal block
TB1
TB2
TB6
TB5
TB7
TB8
TB9
Parts arrangement view
Terminal block
TB10
TB11
Connector
Switch
JSW11
JSW10
CNACT1
Table. 1 Switch setting
-1 OFF
-2 OFF
JSW10
-3 OFF
-4 OFF
125
-
CNI2
CNI4
Fig.1 Position of capacitor
JSW11
-
'12 • PAC-T-178
PCA012D025D
Voltage measurement parts
-1 OFF
-2 OFF
-3 ON
-4 ON
N