Mitsubishi Heavy Industries V Multi FDC71VNX Technical Manual page 157

(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 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)
Terminal block
TB1
TB2
PCA565A151-1
TB6
TB5
TB7
TB8
TB9
Parts arrangement view
Models FDC100VNX, 125VNX, 140VNX
JSW10
Terminal block
Parts No.
CNACT1
Table. 1 Switch setting
-1 OFF
-2 OFF
JSW11
-3 OFF
-4 OFF
156
- -
TB10
TB11
Connector
CNI2
CNI4
Switch
JSW11
JSW10
Fig.1 Position of capacitor
-1 OFF
-2 OFF
-3 ON
-4 ON
'19 • PAC-T-327
PCA012D025D
P
Voltage measurement parts