Mitsubishi Heavy Industries V Multi FDC71VNX Technical Manual page 159

(iv) Model FDC200VSA
Replace the inverter PCB (Fig.1) according to the following procedure.
(iv) Model FDC200VSA
1 ) Replace the inverter PCB after elapsing 3 minutes from power OFF.
Replace the inverter PCB (Fig.1) according to the following procedure.
(Be sure to measure voltage (DC) of two places ((A) power source for fan motor (DC), (B) power source for
1 ) Replace the inverter PCB after elapsing 3 minutes from power OFF.
inverter), and check that the voltage is discharged sufficiently.(Refer to Fig.2))
(Be sure to measure voltage (DC) of two places ((A) power source for fan motor (DC), (B) power source for
2 ) Take off the wirings and connectors of inverter PCB, the screws of power transistor. Then remove the PCB from
inverter), and check that the voltage is discharged sufficiently.(Refer to Fig.2))
the control. Wipe off the silicon grease neatly on the control 's radiation fins.
2 ) Take off the wirings and connectors of inverter PCB, the screws of power transistor. Then remove the PCB from
3 ) Match the setting of switches (JSW10, 11) of new PCB with the former PCB.
the control. Wipe off the silicon grease neatly on the control 's radiation fins.
3 ) Match the setting of switches (JSW10, 11) of new PCB with the former PCB.
4 ) Before installing the new PCB to the control, apply the bundled silicon grease uniformly on the surface of power
4 ) Before installing the new PCB to the control, apply the bundled silicon grease uniformly on the surface of power
transistor, and all use it up at that time. The power transistor can be damaged, if the silicon grease is not applied.
transistor, and all use it up at that time. The power transistor can be damaged, if the silicon grease is not applied.
5 ) Tighten the screws of power transistor on inverter PCB and reconnect the wirings and connectors to inverter PCB.
5 ) Tighten the screws of power transistor on inverter PCB and reconnect the wirings and connectors to inverter PCB.
After connection, confirm the screws are tightened and connectors are not half inserted.
After connection, confirm the screws are tightened and connectors are not half inserted.
However, tighten the power transistor with the screws according to recommended tightening torque after
However, tighten the power transistor with the screws according to recommended tightening torque after
tightening the screws temporarily once.
tightening the screws temporarily once.
Power transistor can be damage if not tightened according to this procedure.
Power transistor can be damage if not tightened according to this procedure.
(Temporary tightening torque:0.20 - 0.44N･m, Recommended tightening torque:0.98 - 1.47 N･m)
(Temporary tightening torque:0.20 - 0.44N･m, Recommended tightening torque:0.98 - 1.47 N･m)
CN2
CNW1
CNW1
Parts No.
Parts No.
TB5
TB5
TB7 TB8 TB9
Fig.1 Parts arrangement view of inverter PCB
TB7 TB8 TB9
Fig.1 Parts arrangement view of inverter PCB
(B) Voltage measurement points for inverter
: TB5(+) – TB6(–)
(V) Model FDC250VSA
Replace the inverter PCB (Fig.1) according to the following procedure.
1) Replace the PCB after elapsing 3 minutes from power OFF.
CN2 CNO1
CNO1
CNA
LED1
CNI2
CNR
CNV
CNE10
TB6 JSW11
JSW10
TB6
JSW10
Fig.2 Voltage measurement points
158
-
CNA
After elapsing 3 minutes
After elapsing 3 minutes
from power OFF
from power OFF
LED1
CNI2
CNR
CNV
Switch setting
-1
Switch setting OFF
-2 OFF
JSW10
-3 OFF
CNE10
JSW10
-4 OFF
JSW11
(A) Voltage measurement points for fan motor (DC)
: CNA1, 1pin(+) – 4pin(–)
-
'19 • PAC-T-327
PCA012D063
-1
OFF
-2 OFF
-1 OFF
JSW11
OFF
-3
-2
OFF
JSW11
-4 OFF
-3 OFF
-4 OFF
-1
OFF
-2
OFF
-3 OFF
-4 OFF