AE-X15PU
3 – 9
4. IPM check method
Turn off the power, let the large capacity electrolytic capacitor (C8, C9) discharge completely, and dismount the IPM. Then, using a tester, check leak
current between C and E.
When using a digital tester, the (+) and (-) tester lead wires in the table must be reversed.
Values in ( ) are for digital tester.
Needle-type tester
Normal resistance value
(-)
(+)
P
N
(several M
Ω
)
U
V
W
Needle-type tester
Normal resistance value
(-)
(+)
U
N
∞
(several M
Ω
)
V
W
∞
[7] OUTDOOR UNIT CHECK METHOD
After repairing the outdoor unit, conduct the following inspection procedures to make sure that it has been repaired completely. Then, operate the
compressor for a final operation check.
1. Checking procedures
No
.
y
d
e
m
e
R
n
o
i
t
i
d
n
o
c
/
e
u
l
a
v
l
a
m
r
o
N
d
o
h
t
e
m
k
c
e
h
C
m
e
t
I
1
Preparation
Disconnect compressor cords (white,
orange, red: 3 wires) from compres-
sor terminals, and connect simulated
load (lamp used as load).
Operate air conditioner in cooling or
heating test operation mode.
2
Inverter DC power supply
voltage check
Measure DC voltage between IPM
pins (20) and (24).
.
B
W
P
l
o
r
t
n
o
c
e
c
a
l
p
e
R
C
D
V
0
2
3
Replace diode bridge.
Correct soldered section of Fas-
ten tabs (BT1, BT2, BT5,BT6) on
control PWB and IPM (S, C, R).
(Repair solder cracks.)
3
IPM circuit check
Check that 3 lamps (load) light.
Check position detection voltage (+15
V, 5 V) on control PWB.
Each voltage should be normal.
All 3 lamps (load) should light with
same intensity.
Replace control PWB.
4
Compressor check
Measure compressor coil resistance
(for each phase of U, V and W).
Use multi-meter or digital tester capa-
ble of displaying two digits right of the
decimal point (0.01
Ω
).
Resistance value at 20
℃
--- 0.65
Ω
Correct connections at compres-
sor terminals.
Replace compressor.
5
Expansion valve check
Measure expansion valve coil resis-
tance.
Each phase 46
±
3
Ω
(at 20
℃）
Replace expansion valve.
6
Final check
Turn off power, and connect compres-
sor cords to compressor.
Operate air conditioner.
Measure DC voltage between IPM
pins (20) and (24).
Compressor should operate nor-
mally.
200 VDC or higher.
Replace control PWB.
Replace outdoor unit thermistor.
Replace compressor (in case of
compressor lock).
