–
315
–
(2) Explanation of troubleshooting
(a) Checking 15V on the control PCB (Step to check if the inverter PCB fails or not)
Use this to diagnose E41, E42, E45 and E48.
Check between #1 and #2 of CNI3 on the control PCB to see if 15V is detected.
Power OFF (Power supply circuit breaker OFF)
Be sure to wait for 3 minutes after turning the power circuit breaker off.
Disconnect the fan motor wires. (Both the power cable and control wires)
Turn the power ON (power circuit breaker ON) and start operation with the test run SW.
Since, unless 15V is detected, faulty inverter PBC is suspected, check CNI3 at the
control PCB side, the connector connection of CNI4 at the inverter side and breakage of
communication wires. If everything is all right, replace the inverter PCB.
(b) Checking method of power transistor module (including drive circuit)
Are there any crack and/or burnout on
power transistor module?
Are there any short-circuit between the
terminals on power transistor module? *1
Is the balance between phases of
compressor OK?
Operate the compressor
Normal
Replace inverter PCB
YES
YES
YES
NO
NO
NO
More than 10% difference of current
(Except at accelerating/decelerating)
*1 case of 224 and 280 model, replace
power transistor PCB as well.
Tester
FDC112, 140, 155KXE6
FDC224-680KXE6
Terminal (+) Terminal (–)
Normal value (Ω)
P
N
about 1M
about 300-400
Several 10 M
N
P
Several M
P
U
0
Several 10 M
P
V
P
W
N
U
about 1.2M
Several 100K
N
V
N
W
U
P
about 1.3M
Several 100K
V
P
W
P
U
N
0
Several 10 M
V
N
W
N
Note (1) When a measured value is 0 – a few kΩ, the element may be broken. Replace the power transistor part.
*1 Inspection of short-circuit on the
power transistor module terminals
Disconnect the wiring of compressor and
check for short-circuit with a tester.
Inspect between terminals of:
P-U, P-V, P-W, N-U, N-V, N-W and P-N
It will be easier to contact the tester at
the following place at each terminal.
P: P terminal of power transistor
N: N terminal of power transistor
U: End of red harness to compressor
V: End of white harness to compressor
W: End of blue harness to compressor
Summary of Contents for FDC112KXEN6
Page 116: ... 112 4 Sensible heat capacity ...
Page 117: ... 113 ...
Page 118: ... 114 ...
Page 119: ... 115 ...
Page 120: ... 116 ...
Page 121: ... 117 ...
Page 122: ... 118 ...
Page 123: ... 119 ...
Page 124: ... 120 ...
Page 125: ... 121 ...
Page 126: ... 122 ...
Page 127: ... 123 ...
Page 128: ... 124 ...
Page 129: ... 125 ...
Page 130: ... 126 ...
Page 131: ... 127 ...
Page 132: ... 128 ...
Page 133: ... 129 ...
Page 134: ... 130 ...
Page 135: ... 131 ...
Page 136: ... 132 ...
Page 137: ... 133 ...
Page 138: ... 134 ...
Page 139: ... 135 ...
Page 140: ... 136 ...
Page 141: ... 137 ...
Page 142: ... 138 ...
Page 143: ... 139 ...
Page 144: ... 140 ...
Page 145: ... 141 ...
Page 146: ... 142 ...
Page 147: ... 143 ...
Page 148: ... 144 ...
Page 149: ... 145 ...
Page 150: ... 146 ...
Page 151: ... 147 ...
Page 152: ... 148 ...
Page 153: ... 149 ...
Page 154: ... 150 ...
Page 155: ... 151 ...
Page 156: ... 152 ...
Page 157: ... 153 ...
Page 158: ... 154 ...
Page 159: ... 155 ...
Page 160: ... 156 ...
Page 161: ... 157 ...
Page 162: ... 158 ...
Page 163: ... 159 ...
Page 164: ... 160 ...
Page 165: ... 161 ...
Page 166: ... 162 ...
Page 167: ... 163 ...
Page 168: ... 164 ...
Page 169: ... 165 ...
Page 170: ... 166 ...
Page 171: ... 167 ...
Page 172: ... 168 ...
Page 173: ... 169 ...