Mitsubishi Heavy Industries SRK100VNXWZRF Service Manual page 51

(c) Outdoor inverter PCB replacement procedure (c) Outdoor inverter PCB replacement procedure
• Since the following precaution is the important contents for safety, be sure to observe them. • Since the following precaution is the important contents for safety, be sure to observe them.
WARNING and CAUTION are described as follows: WARNING and CAUTION are described as follows:
WARNING WARNING
CAUTION CAUTION
• Securely replace the PCB according to this procedure. • Securely replace the PCB according to this procedure.
If the PCB is incorrectly replaced, it will cause an electric shock or fire. If the PCB is incorrectly replaced, it will cause an electric shock or fire.
• Be sure to check that the power source for the outdoor unit is turned OFF before replacing the • Be sure to check that the power source for the outdoor unit is turned OFF before replacing the
PCB. The PCB replacement under current-carrying will cause an electric shock or fire. PCB. The PCB replacement under current-carrying will cause an electric shock or fire.
• After finishing the PCB replacement, check that wiring is correctly connected with the PCB before • After finishing the PCB replacement, check that wiring is correctly connected with the PCB before
power distribution. If the PCB is incorrectly replaced, it will cause an electric shock or fire. power distribution. If the PCB is incorrectly replaced, it will cause an electric shock or fire.
• • Band the wiring so as not to tense because it will cause an electric shock. Band the wiring so as not to tense because it will cause an electric shock.
Replace the inverter PCB according to the following procedure. Replace the inverter PCB according to the following procedure.
(i) Model FDC71VNX (i) (i) Model FDC71VNX Model FDC100VNX-W
1) Replace the PCB after elapsing 3 minutes from power OFF.
Replace the PCB after elapsing 3 minutes from power OFF . Replace the PCB after elapsing 3 minutes from power OFF .
1) 1)
(Be sure to measure voltage (DC) on both capacitor terminals located in control back, and check that
(High voltage is retained on the capacitor after turning the power off. It is very dangerous to touch the PCB (High voltage is retained on the capacitor after turning the power off. It is very dangerous to touch the PCB
the voltage is discharged sufficiently.(Refer to Fig.1.))
in this condition.) in this condition.)
2) Take off the connection of inverter PCB terminal block connector and remove the screw of power transistor
n the situation that harnesses are connected to inverter PCB be sure to measure voltage (DC) between T26 n the situation that harnesses are connected to inverter PCB be sure to measure voltage (DC) between T26
I I
then remove the PCB. Wipe off the silicon grease neatly on the control's radiation heat fins.
and T27 on inverter PCB, and check that the voltage is discharged sufficiently. (Refer to Fig.2). and T27 on inverter PCB, and check that the voltage is discharged sufficiently. (Refer to Fig.2).
3) Match the setting switches (JSW10,11) of new PCB with the former PCB.
2) Disconnect the connectors and faston terminals from the inverter PCB as shown in Fig. 1. 2) Disconnect the connectors and faston terminals from the inverter PCB as shown in Fig. 1.
4) Before installing the power transistor on the new PCB, apply uniformly a bundled of silicon grease first on the
3) 3)
Match the setting of switches (JSW10, 11) of new PCB with former PCB. Match the setting of switches (JSW10, 11) of new PCB with former PCB.
surface of power transistor.Make sure it is applied to prevent damage on power transistor.
4) Remove the harness bands (3 places) from the control unit, then remove the fixing screws (4places) from the 4) Remove the harness bands (3 places) from the control unit, then remove the fixing screws (4places) from the
5) Tighten the screw of power transistor on inverter PCB and connect the terminal block.Confirm the connection
radiator. (Refer to Fig.3) radiator. (Refer to Fig.3)
and don't use soldering in the connection.Tighten properly the power transistor with a screw and make sure
5) Remove the inverter PCB with radiator from the control unit, and exchange the inverter PCB with radiator. 5) Remove the inverter PCB with radiator from the control unit, and exchange the inverter PCB with radiator.
there is no slack.Power transistor can be damage if not properly tighten.(Recommended power transistor
Be careful not to pinch the wiring at the time of exchanging. Be careful not to pinch the wiring at the time of exchanging.
tightening torque:0.98 – 1.47N∙m)
6) Fix the radiator to the control unit by screws. After exchanging the inverter PCB, reconnect the connectors, faston 6) Fix the radiator to the control unit by screws. After exchanging the inverter PCB, reconnect the connectors, faston
terminals and the harnesses as before. (Confirm that the connectors are not half inserted.) terminals and the harnesses as before. (Confirm that the connectors are not half inserted.)
7) Attach the harness bands (3 places), then reconnect the harnesses as before. 7) Attach the harness bands (3 places), then reconnect the harnesses as before.
Terminal block
8) Install the harness clip on the inverter PCB as shown in Fig.4, and fix the harness. 8) Install the harness clip on the inverter PCB as shown in Fig.4, and fix the harness.
TB1
TB2
T21(Red) T21(Red)
TB6
T23(Blue) T23(Blue)
T51(Yellow) T51(Yellow)
TB5
Parts No. Parts No.
TB7
T52(Orange) T52(Orange)
TB8
TB9
T26(Red) T26(Red)
Parts arrangement view
CNI4 CNI4
Model FDC100VNX-W
CNO1 CNO1
JSW10
Precautions for Safety Precautions for Safety
Indicates an imminently hazardous situation which will result in death or serious Indicates an imminently hazardous situation which will result in death or serious
injury if proper safety procedures and instructions are not adhered to. injury if proper safety procedures and instructions are not adhered to.
Indicates a potentially hazardous situation which may result in minor or moderate Indicates a potentially hazardous situation which may result in minor or moderate
injury if proper safety procedures and instructions are not adhered to. injury if proper safety procedures and instructions are not adhered to.
Parts No.
T22(White) T22(White)
PCA565A151-1
CNACT1
Table. 1 Switch setting
-1 OFF
-2 ON
-3 OFF
Fig.1Parts arrangement view of inverter PCB Fig.1Parts arrangement view of inverter PCB
-4 OFF
50
-
WARNING WARNING
CAUTION CAUTION
Terminal block
TB10
TB11
Connectors are not half Connectors are not half
Connector
inserted inserted
CNG2 CNG2
CNI2
T29(White) T29(White)
LED
T30(Blue) T30(Blue)
CNI4
T28(Red) T28(Red)
Switch
T62(Orange) T62(Orange)
JSW11
JSW10
T27(Blue)
JSW10,11
Fig.1 Position of capacitor
CNI2
Presence and shape of electric component
*
-1 OFF
may vary according to model.
*( ) shows harness color.
-2 OFF
JSW11
-3 OFF
-4 ON
-
'22 • PAC-SM-422
PCA012D025D
Voltage measurement parts
T27(Blue)
LED(Yellow)
JSW10,11
CNI2
Presence and shape of electric component
*
may vary according to model.
*( ) shows harness color.
R