Hitachi RAS-E10H2 - POWER MODULE DIAGNOSIS WITH MULTIMETER

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for measuring
value usin
g
multimeter
PS21564-C
Circuit of 1 device
Gate
Collector
Emitter
Internal circuit
diagram of
module
Terminal
symbols of
power module
6：PGU
12：PGV
18：PGW
21：NGU
22：NGV
23：NGW
24：Fail signal
31：P
32：U
33：V
34：W
35：N
28 26 24 22 20 18 16 12 10 6 4 1
27 25
35 34 33 32 31
N W V U
P
23 21 15 13 9 7 3
Model
PUV W
U
PN
V W N
−
＋＋
−
＋＋
Diagnosis procedure for power module using multimeter
[Inverter section]
Set the multimeter to resistance range of ×
100. If ×100 is not provided, measure with the range of ×
1 to × 100.
If the pointer does not swing when the following continuity check is performed, it is normal.
(When a digital multimeter is used, + and - terminals will be reversed, since the orientation of built-in
battery is inverted.)
Note:
If internal circuit of power module is disconnected (open) and pointer of the mutimeter does not swing,
it may be assumed to be normal. If the pointer swings when + and - terminals are connected in
reverse, it is normal. Compare swing statuses for U, V and W phases: If the statuses at all 3 points are
the same, it is normal.
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