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DC compressor
motor
DC current (Id)
detection resistor
6DI20S
Fig.
3— 4
Power module circuit (U* is ON, V- is ON)
e
Since current flows at point @) only when U* transistor is ON, the current waveform at point
becomes intermittent waveform as shown in Fig. 3-3. Since current at point
is approximately
proportional to the input current of the air conditioner, input current is controlled by using DC current (Id)
detection resistor.
<Reference>
If power module is defective, self diagnosis lamps on the control P.W.B. may indicate as shown below;
Table 3 — 1
Self-diagnosis
lamp
(LD301)
Ip (peak current cut)
LD301
anti é
Pm
1202
Self-diagnosis lamps
I
4
(L303)
Abnormal low speed
Blinks 3
off
rotation
LD301 | times
=]
ae"
S a k e
in
Blinks 4
Switching incomplete
LD301
fimos
Fig.
3 —5
e
Simplified check of power module (Lighting mode when operated with compressor leads disconnected)
(1)
Disconnect connector of 3-pole (WHT, YEL, RED) lead wire connecting to compressor located at the
lower part of electric parts box.
(2)
Set to compressor operation state (other than FAN mode) and press Start/stop switch of remote
control.
(3)
If normal operation continues for more than 1 minute (LD303 lights), power module is considered
normal.
*
Refer to other item (troubleshooting on page 109) for independent checking of power module.
— 124-
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