Mitsubishi Heavy Industries V Multi FDC71VNX Technical Manual page 158

(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 control 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 control'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
TB6
TB5
TB9
TB8
TB7
Parts arrangement view
Models FDC100VSX, 125VSX, 140VSX
JSW10
Models FDC100VSA, 125VSA, 140VSA
JSW10
Parts No.
CNW2
CNR
CNI2
JSW10
Table. 1 Switch setting
-1 OFF
-2 OFF
-3 OFF
-4 OFF
-1 OFF
ON
-2
-3 OFF
-4 OFF
157
-
JSW11
Fig.1 Position of capacitor
-1
-2
JSW11
-3
-4
-1
-2
JSW11
-3
-4
-
'19 • PAC-T-327
PCA012D025F
P
Voltage measurement parts
ON
OFF
ON
ON
OFF
OFF
ON
OFF