– 95 –
By connecting CN3 and CN4.
Check the voltage between "+15V" and
"15-0V" on power P.W.B.
By disconnecting CN3 and CN4.
Check the voltage between "+15V"
and "15-0V" on power P.W.B.
Diagnosis procedure of IPM using multimeter.
<Inverter section>
Set the multimeter function to resistance x 100.If the multimeter dose not have x 100 range, please select
its range from x 1 to x 100.
The judgment shall be OK. When the measurement was high resistance.
(Please consider that the probe polarity will be reserve when use a digital mulimeter due to its battery
connection inside)
<note>
Sometimes, it may misjudge as OK because of low conductivity when power module was damaged as
disconnect mode. In this case, please check the resistance by reversing the probe polarity and consider
OK when it was low resistance. Also, it is OK if the resistance was as same as the other phases (U,V,W).
<Driver circuit (internal IC)>
15V will not be generated when the internal IC has malfunctioned.
procedure following.
Replace P.W.B.
Lower
(than 15V)
Lower
(than 15V)
Power P.W.B. may malfunction.
(Replace power P.W.B.)
Normal(15V)
Normal(15V)
Internal IC is OK.
Driver IC which is in IPM may
malfunction.(Replace main P.W.B.)
To find the malfunction either the power supply of power P.W.B. or internal IC, please follow the
Summary of Contents for RAC-18YH4
Page 21: ... 19 GRAM 18YH4 RAC 18YH4 CAUTION The marked parts are very important ones for safety ...
Page 23: ... 21 RAS 18YH4 MODEL ...
Page 24: ... 23 RAC 18YH4 MODEL Ｈ８ ３ ０ ３ ９ ＡＸ ８ Ｔ １ ０ ...
Page 27: ... 26 MAIN P W B MARKING ON P W B COMPONENT SIDE SOLDERING SIDE MODEL RAC 18YH4 ...
Page 29: ... 29 button MODEL RAS 18YH4 BASIC MODE 31 33 33 33 37 35 ...
Page 35: ... 38 REFRIGERATING CYCLE DIAGRAM MODEL RAS 18YH4 RAC 18YH4 SUCTION TANK SUCTION TANK ...
Page 99: ...Printed in Japan TSK AW NO 0004E RAS 18YH4 RAC 18YH4 ...
