Mitsubishi Heavy Industries SRRM40HENG-L, Handbook, Page: 936 / 1106

FDC-HKX
934
5
4 6
~
~ ~
1 2 3
Normal LED2 check: If it flashes, the microcomputer operates normally.
CNL
1 2 3 7 8 9
1 3
14
15 19 2
0
21
22 23
24
25
CM
U V W
CnW
2 1
+
–
+
–
+
–
CNR
LD1
Green
*
LED1 (Green) It is normal if it flashes at each 0.5- second.
LD2
Red
CNI2
CNI1
Transformer
Control PCB
CNA1 CNA2
LED1
Red
LED2 Green
6
7
5
Unit: V(AC)
*
DC540V
4
3
TB
L1 L2 L3
N
52C
R1
1 2 3 4 5 6 7
1 2 3 4 5 6 7
2
*
Connector
Detail of communication
CN11
1 2 3 4
Common 12V power supply Transmission to inverter Receiving from inverter
V (Analog tester)
Watchdog (Communication from invert PCB to outdoor PCB) Inverter overheat Current cut
0V 12V Swings between 11 ~ 11.5V Swings between 4.5 ~ 5V Swings between 2 ~ 4V It is normal if 5V or abnormal if 0V It is normal 5V or abnormal if OV
5 6 7
• Communication checked at the CN11 will show the following values.
LED2 (red) check 1 time flash
: Power transistor overheat • Stop operation and wait till temperature
drops.
2 time flashes
: Current cut (power transistor over-current) • Short-circuited compressor wiring • Trouble on inverter PCB • Trouble on power transistor
Keeps flashing: Transmission error between inverter and
outdoor unit
• Connector CN11 or CN12 is disconnected or
broken wire between connectors.
• Error on outdoor control PCB • Error on inverter PCB
* Check points of outdoor unit
Check with power ON at the points marked with *. Turn power OFF before starting inspection. Also remove each part before starting inspection. Inspection of power cables: There must be continuity on the cables. Cables must be connected properly.
Mark
Tester probe (Red)
Tester probe (Black)
Noise filter check: There must be a continuity. Fuse check: There must be continuity.
Check of power supply
Check the power sup- ply on L
1
, L
2
and L
3
of terminal block TB. (It is normal if AC 380V is detected.)
•
*
Noise filter
7-segment indicator
Reactor continuity check Continuity check after disconnecting the connector: There must be continuity.
Resistor R1 check: Mea- sure the resistance value.
FDC140 FDC224 FDC280
30
Ω
30
Ω
30
Ω
Are there any abnormality such as crack, burn, etc. in appearance?
Diode module check
If tester probes are inverted, the connection becomes open.
Tester probe
+ ~
6
-
5
~
If good
Continuity
Capacitor check
Check for abnormality in appear- ance such as damage, swell, etc. Check the charging characteristics with a tester.
It is normal if the needle swings followed by a gradual return and, when tested again after changing the polarity, the needle returns again.
Power transistor output check Measure the output voltage after disconnecting the fasten terminal from the compressor. (Values of output voltage indicate those obtained when no load is applied to the inverter.)
Type All types (outdoor)
35Hz
160~180
40Hz
180~210
65Hz
290~320
75Hz
330~360
95Hz
380~410
Frequency
Notes
(1) Confirm that all voltages measured between U-K, V-W and W-U are same. (2) Values listed above are those obtained using a digital tester after disconnecting the terminals on
the compressor. The values vary depending on the kinds of measuring instrument.
Power transister module
Inverter PCB
Transformer check: There must be continuity at the primary side after disconnecting the connec- tor CNAI.