Mitsubishi Electric PUHY-P168, 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].5.(6) )
IPM (Intelligent power
module) Refer to "Intelligent power module (IPM)" ( 9.[4] -5- (5) )
Rush current protection re-
sistor
R1
Measure the resistance between terminals: 22 ohm +- 10%
Electromagnetic relay
52C1
Electromagnetic con-
tactor
52C2, 52F
DC reactor DCL Measure the resistance between terminals: 1ohm or lower (almost 0 ohm)
Measure the resistance between terminals and the chassis:
Noise filter
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
Row A
Short circuit is not allowed.
Row B to Row E
Measure resistance between terminals on each row.
Installation direction
Test button
Row
A
Row
B
Row
C
Row
D
Row
E
* The coil is driven when AC 208 / 230V is applied.
Note that the coil is not driven at DC 12V, which is
different from the conventional relays.
The resistance of row A cannot be measured with
a tester. Check that it is not short-circuited.
Check point Judgment value
A1-A2 0.1 k ~ 2.0 k
Button
on
(hold down)
Button
OFF
L1 - U
L2 - V
L3 - W
13 - 14
31 - 32
L1 - U
L2 - V
L3 - W
13 - 14
31 - 32
13
Pushbutton
L1 L3 L2
A1 A2
31
14 U W V 32
[In the case of 52C2]
13
Pushbutton
L1 L3 L2
A1 A2
14 U W V
[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 )
Check point Judgment value
FN 3 - 6 , FN 2 - 4
FN 1 - 2 , FN 2 - 3 ,
FN 4 - 6
FN1 , FN2 , FN3 ,
FN 4, FN6
Resistance check between each terminal
and between terminal and case.
FN2
FN1
FN3
FN4
FN6
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