Hitachi RAF-25NH4 Données Techniques page 265

OW TO C ECK POWER MODULE
Checking power module using tester
Set tester to resistance range ( 100)
×
If indicator does not swing in the following conductivity check, the power module is normal.
(In case of digital tester, since built-in battery is set in reverse direction, + and - terminals are reversed.)
!
CAUTION
If inner circuit of power module is disconnected (open), the indicator of tester will not swing and this may
assumed as normal. In this case, if indicator swings when + and - terminals are connected in reverse of
diagram below, it is normal. Furthemore, compare how indicator swings at U, V and W phases. If indicator
swings the same way at each point, it is normal.
P1 N1 P2 U P1 N1 P2 U
1 5 1 5
W V W V
L2 L1 L2 L1
290