Mitsubishi Electric HP120TNU-A Service Handbook page 293

[8-10 Troubleshooting Inverter Problems ]
8-10-13 Simple Check on Inverter Circuit Components
Turn off the power to the unit, and leave it turned off for at least 10 minutes. Check that the voltage across pins 1 (+) and
5 (-) of the connector RYPN1 is 20 VDC or less before removing components from the control box.
Part name
IGBT module Refer to the following page(s). [8-10-14 Troubleshooting Problems with IGBT Module]
Rush current pro- Measure the resistance between terminals R1 and R5: 22 ±10%
tection resistor
R1, R5
Electromagnetic
relay
72C
Coil
Contact
DC reactor Measure the resistance between terminals: 1 or lower (almost 0 )
DCL Measure the resistance between terminals and the chassis:
Current sensor Disconnect the wiring connector from CNCT2, and measure the inter-teminal resistance: 280 ±30
ACCT Between pins 1 and 2 (U-phase), pins 3 and 4 (W-phase)
52
- chapter 8
This electromagnetic relay is rated at DC12V and is driven by a coil.
Check the resistance between terminals
4 3
1 2
INV35Y, INV42Y INV37YC
INV board INV board
X901, X902 X101, X102, X103
Across pins 1-2 Across pins 1-2
INV board INV board
FT-P1 and FT-P2 FT100 and FT101
*Faston terminal removed *Faston terminal removed
ACCT-U
*Check ACCT wiring for correct phase and direction.
Judgment method
Check point
INV38 INV39C
INV board INV board
X901, X902, X903 X100, X101, X102, X103
Across pins 1-2 Across pins 1-2
INV board
FT-P1 and FT-P2 FT100 and FT101
*Faston terminal removed *Faston terminal removed
INV board
SC-U SC-V SC-W
U W ACCT-W
Checking criteria
160Ω ± 10%
INV board CNRY
INV board
Open: ∞
INV board CNRY
At a voltage input of
12 VDC: 0Ω
HWE18220_GB