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SiUS34-801A_b
Troubleshooting (OP: Unified ON/OFF Controller)
Troubleshooting
461
[CHECK 4] Power Transistor Check
Perform the following procedures prior to check.
(1) Power Off.
(2) Remove all the wiring connected to the PC board where power transistors are mounted on.
[Preparation]
· Tester
∗
Preparing a tester in the analog system is recommended.
A tester in the digital system with diode check function will
be usable.
[Point of Measurement and Judgment Criteria]
· Measure the resistance value using a tester at each point of measurement below, 10 minutes later after power OFF.
To use analog tester:
Measurement in the resistance value mode in the range of
multiplying 1k
Ω
.
Point of Measurement
Judgment Criteria
Remarks
+
–
No.
15k
Ω
and
above
(including
)
2 ~ 15k
Ω
2 ~ 15k
Ω
Due to condenser charge
and so on, resistance
measurement may require
some time.
P2
P2
P2
U
V
W
N3
N3
N3
U
V
W
1
2
3
4
5
6
7
8
9
10
11
12
P2
P2
P2
U
V
W
U
V
W
N3
N3
N3
Point of Measurement
Judgment Criteria
Remarks
+
–
No.
0.3 ~ 0.7V
1.2V and over
1.2V and over
Due to condenser charge
and so on, resistance
measurement may require
some time.
Due to condenser charge
and so on, resistance
measurement may require
some time.
P2
P2
P2
U
V
W
N3
N3
N3
U
V
W
1
2
3
4
5
6
7
8
9
10
11
12
P2
P2
P2
U
V
W
U
V
W
N3
N3
N3
To use digital tester:
Measurement is executed in the diode check mode. ( )
[PC board and Circuit Diagram]
P3
U
V
W
N3
J1
J2
J3
P1
P1
P2
IGBT
X11A
U
V
W
L1
L2
L3
X10A
DM
K2
P3
N3
(V2895)
J1
J2
J3
Summary of Contents for VRV III
Page 15: ...SiUS34 801A_b xiv ...
Page 23: ...Model Selection SiUS34 801A_b 8 General Information ...
Page 133: ...Field Settings SiUS34 801A_b 118 VRVIII R 410A Heat Pump 60Hz ...
Page 254: ...SiUS34 801A_b Test Operation VRVIII R 410A Heat Recovery 60Hz 239 R 410A Label R 410A Label ...
Page 329: ...Field Setting SiUS34 801A_b 314 Indoor Unit ...
Page 340: ...SiUS34 801A_b Troubleshooting by Remote Controller Troubleshooting 325 ...
Page 490: ...SiUS34 801A_b Piping Diagrams Appendix 475 Heat Pump 230V RXYQ72 96 120PTJU 3D058636A ...
Page 491: ...Piping Diagrams SiUS34 801A_b 476 Appendix Heat Pump 230V RXYQ144PTJU 3D058640 ...
Page 492: ...SiUS34 801A_b Piping Diagrams Appendix 477 Heat Recovery 460V REYQ72 96 120PYDN 3D058639A ...
Page 493: ...Piping Diagrams SiUS34 801A_b 478 Appendix Heat Recovery 460V REMQ72PYDN 3D058637A ...
Page 494: ...SiUS34 801A_b Piping Diagrams Appendix 479 Heat Recovery 460V REMQ96 120PYDN 3D058638A ...
Page 495: ...Piping Diagrams SiUS34 801A_b 480 Appendix Heat Recovery 230V REYQ72 96 120PTJU 3D058639A ...
Page 496: ...SiUS34 801A_b Piping Diagrams Appendix 481 Heat Recovery 230V REYQ144PTJU 3D058640 ...
Page 497: ...Piping Diagrams SiUS34 801A_b 482 Appendix Heat Recovery 230V REMQ72PTJU 3D058637A ...
Page 498: ...SiUS34 801A_b Piping Diagrams Appendix 483 Heat Recovery 230V REMQ96 120PTJU 3D058638A ...
Page 501: ...Piping Diagrams SiUS34 801A_b 486 Appendix 1 3 BS Unit 4D057985A ...
Page 537: ...Piping Installation Point SiUS34 801A_b 522 Appendix ...
Page 543: ...Pressure Sensor SiUS34 801A_b 528 Appendix ...
Page 563: ...SiUS34 801A_b iv Index ...