-
287
-
Note (1) In models 802 and 1002, also
replace the power transistor.
Compressor operation
Replace the outdoor
unit inverter PCB
Normal
YES
NO
NO
YES
YES
NO
Is the power
transistor module
cracked or burnt?
Is there a
short circuit between the
power transistor module
terminals?
∗
1
If there is a 10% or greater difference
in the current in different phases.
(except during acceleration or deceleration)
Is there any difference in
the compressor current
between phases?
Power transistor module (including the driver PCB) inspection procedure
∗
1 Power transistor module terminal short circuit check procedure
Disconnect the compressor wiring, then conduct a short circuit check.
P-U, P-V, P-W
N-U, N-V, N-W
Check between the P-N terminals.
Bring the tester probes in contact with the following
places on each terminal.
P: Power transistor P terminal,
N: Power transistor N terminal,
U: End of red harness to compressor
V: End of white harness to compressor
W: End of black or blue harness to compressor
Normal values (
Ω
)
Check for a power transistor short circuit.
•
When you do not have a diagnostic checker for judging if the inverter is defective, measure
between the terminals of the power transistor parts, judge whether the power transistor is defective
or not.
•
Disconnect the compressor, then measure with the controller incorporated.
Tester
Terminal (+)
P
N
P
P
P
N
N
N
U
V
W
U
V
W
Terminal (-)
N
P
U
V
W
U
V
W
P
P
P
N
N
N
0 ~
(Numerical
value rises.)
Several M
(Numerical
value rises.)
0 ~
(Numerical
value rises.)
302 ~ 602 HENAR 402 ~ 602 HESAR
802, 1002
Approx. 500 k
Approx. 1.9M
Approx. 500 k
Approx. 500 k
Approx. 670 k
Approx. 4.4 M
Approx. 4.4 M
Approx. 650 k
Approx. 4.8 M
Approx. 4.9 M
Approx. 500 k
Approx. 930 k
Approx. 1.7M
Approx. 650 k
0 ~
(Numerical
value rises.)
Approx.
200~450 k
0 ~
(Numerical
value rises.)
Several M
(Numerical
value rises.)
151 ~ 251
Approx. 180 k
Approx. 160 k
Approx. 240 k
If the measured values range from 0 ~ several k
Ω
, there is a possibility that the elements are
damaged, so replace the power transistor parts.
