Hitachi RAF-25QXA RAF25QXA Manuale Utente
Codici prodotto
RAF25QXA
14-38
14.9 CHECKING POWER MODULE
Checking power module using tester
Set tester to resistance range (x 100)
If indicator shows high resistance in the following conductivity check, the power module is considered normal. (In case of the digital
tester, since builit-in battery is set in reverse direction, ⊕ and ⊝
If indicator shows high resistance in the following conductivity check, the power module is considered normal. (In case of the digital
tester, since builit-in battery is set in reverse direction, ⊕ and ⊝
terminals are reversed).
Caution
However, if the inner circuit of power module is already disconnected (open), the HIGH resistance shown may be misjudged as
normal. In this case, please check the resistance by the reversing ⊕ and ⊝ probe polarity against what is shown in the diagram
below.and measure again, If is considered normal if the tester shows LOW resistance. Furthermore, compare how the indicator
swings at each U, V and W phases. If indicator swings the same way at each terminal, the power module is judged normal
normal. In this case, please check the resistance by the reversing ⊕ and ⊝ probe polarity against what is shown in the diagram
below.and measure again, If is considered normal if the tester shows LOW resistance. Furthermore, compare how the indicator
swings at each U, V and W phases. If indicator swings the same way at each terminal, the power module is judged normal
14.9.1 RAC-25NPA, 35NPA, 50NPA & RAM-36NP2A, 53NP2A, 53NP3A, 68NP3A, 70NP4A, 130NP6A
14.9.2 RAM-90NP5A