Mitsubishi Electric PUHY-HP144TSHMU-A Service Handbook page 210

[ IX Troubleshooting ]
(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" ( 9 [4] - 6 - (6) )(page 203)
IPM (Intelligent Refer to "Intelligent power module (IPM)" ( 9 [4] - 6 - (5) )(page 202)
power module)
Rush current Measure the resistance between the + terminal on the diode stack and terminal TB31. (*Can be mea-
protection resis- sured without the need to remove the noise filter board): 22 ohm
tor
R1(R2)
Electromagnetic
relay
This electromagnetic relay is rated at 208/230VAC and is driven by a coil. The resistance between
72C
the 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 Disconnect the CNCT2 connector and measure the resistance between terminals: 280 ohm
ACCT 1 - 2 PIN (U-phase),3 - 4 PIN (W-phase)
HWE0716A
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
- 201 -
10%
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
Contact stack and terminal
With the test button
TB31 on the noise filter
IPM
U
V
ACCT-U
U
Checking criteria
turned off :
turned on : 0
30 ohm
GB