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[8-9 Troubleshooting Inverter Problems ]
8-9-13
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). [8-9-14 Troubleshooting Problems with IGBT Module]
Rush current pro-
Measure the resistance between terminals R1 and R5: 22 Ω±10%
tection resistor
R1, R5
Electromagnetic
relay
72C
DC reactor
Measure the resistance between terminals: 1Ω or lower (almost 0 Ω)
DCL
Measure the resistance between terminals and the chassis: ∞
Current sensor
Disconnect the wiring connector from CNCT2, and measure the inter-teminal resistance: 280Ω±30Ω
ACCT
Between pins 1 and 2 (U-phase), pins 3 and 4 (W-phase)
BS_08_M
This electromagnetic relay is rated at DC12V and is driven by a coil.
Check the resistance between terminals
4
1
ACCT-U
*Check ACCT wiring for correct phase and direction.
Judgment method
Check point
3
INV board
X901, X902
Coil
Across pins 1-2
2
INV board
FT-P1 and FT-P2
Contact
*Faston terminal removed
INV board
SC-U
SC-V
SC-W
U
W
ACCT-W
Checking criteria
160Ω ± 10%
INV board CNRY
Open: ∞
INV board CNRY
At a voltage input of 12 VDC: 0Ω
chapter 8 -
41
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