Mitsubishi Electric PURY-P72 Service Handbook page 307

[ IX Troubleshooting ]
[THMU-A]
(4) Simple checking procedure for individual components of main inverter circuit
Before checking, turn the power off and remove the parts to be checked from the control box.
Part name
Diode stack Refer to "Diode stack" ( IX [4] - 7 - (6) )
IPM (Intelligent Refer to "Intelligent power module (IPM)" ( IX [4] - 7 - (5) )
power module)
Rush current <P72 model>
protection resis- Measure the resistance between terminals: 22 ohm
tor <P96 and P120 models>
R1(R2) Measure the resistance between the + terminal on the diode stack and terminal TB31. (*Can be mea-
sured without the need to remove the noise filter board): 22 ohm
Electromagnetic
relay
This electromagnetic relay is rated at 200VAC and is driven by a coil. The resistance between the
72C
coils in row A cannot be measured with a tester.Check only for shorting.
Test button
DC reactor DCL Measure the resistance between terminals: 1ohm or lower (almost 0 ohm)
Measure the resistance between terminals and the chassis:
Current sensor <P96 and P120 models>
ACCT Disconnect the CNCT2 connector and measure the resistance between terminals: 280 ohm
1 - 2 PIN (U-phase),3 - 4 PIN (W-phase)
HWE0803A
Judgment method
Installation direction
Row Row Row Row Row
A B C D E
A2 44 34 24 14
A1 43 33 23 13
W
W
ACCT-W
*Check the ACCT connection phase and the
direction of the connection
- 298 -
10%
10%
<P72 model>
Check point
Coil
Not to be short-circuited
Row A
With the test button
Contact Row B to Row E
With the test button
<P96 and P120 models>
Check point
Between No. 1 pin and
Coil
No. 3 pin of the CN03 on
Not to be short-circuited
the noise filter board
With the test button
+ terminal on the diode
stack and terminal
Contact
With the test button
TB31 on the noise filter
IPM
V U
ACCT-U
U
Checking criteria
turned off :
turned on : 0
Checking criteria
turned off :
turned on : 0
30 ohm
GB