Simple Check On Inverter Circuit Components - Mitsubishi Electric PURY-HP72 Service Handbook

[8-10 Troubleshooting Inverter Problems (TKMU) ]
8-10-13

Simple Check on Inverter Circuit Components

Turn off the power of the unit and leave it turned off for 10 minutes. Check that the voltage of the electrolytic capacitor (inverter
main circuit) is 20 VDC or below. Then, remove the relevant parts from the control box.
Before checking, turn the power off and remove the parts to be checked from the control box.
Part name
Diode stack Refer to the following page(s). [8-10-15 Troubleshooting Problems with Diode Stack](page 297)
IPM (Intelligent Refer to the following page(s). [8-10-14 Troubleshooting Problems with Intelligent Power Module](page
power module) 296)
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 Ω±10%
tor
R1(R2)
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: 1 Ω or lower (almost 0 Ω)
Measure the resistance between terminals and the chassis:
Current sensor Disconnect the CNCT2 connector and measure the resistance between terminals: 280 Ω± 30 Ω
ACCT 1 - 2 PIN (U-phase),3 - 4 PIN (W-phase)
HWE13080
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
- 295 -
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
GB