Mitsubishi Electric PU(H)Y-P250YGM-A, Service Handbook

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[
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 Judgment method
Diode stack Refer to "Diode stack" ( 9.[4] -6- (6) )
IPM (Intelligent power
module) Refer to "Intelligent power module (IPM)" ( 9.[4] -6- (5) )
Rush current protec-
tion resistor
R11, R12 Measure the resistance between terminals: 47 ohm 10%
Electromagnetic con-
tactor
52C(1), 52C2, 52F
DC reactor DCL Measure the resistance between terminals: 1 ohm or lower (almost 0 ohm)
Measure the resistance between terminals and the chassis:
Current sensor ACCT Disconnect the CNCT2 connector and measure the resistance between terminals: 280 ohm 30 ohm
1 - 2 PIN (U-phase),3 - 4 PIN (W-phase)
Check point Judgment value
A1-A2 0.1 k ~ 2.0 k
Button
on
(hold down)
Button
OFF
L1 - T1
L2 - T2
L3 - T3
13 - 14
31 - 32
L1 - T1
L2 - T2
L3 - T3
13 - 14
31 - 32
13
Pushbutton
L1 L3 L2
A1 A2
31
14 T1 T3 T2 32
[In the case of 52C1, 52C2]
13
Pushbutton
L1 L3 L2
A1 A2
14 T1 T3 T2
[In the case of 52F]
1 or less (almost 0 )
1 or less (almost 0 )
1 or less (almost 0 )
1 or less (almost 0 )
1 or less (almost 0 )
U
U V
IPM
* Check the ACCT connection phase and the
direction of the connection.
W ACCT-W
W
ACCT-U