Checking Procedure For The Dip-Ipm Inverter; Inverter Module Checking Procedure - Hitachi RAS-(3-6)HVNC1(E) Service Manual

8 Troubleshooting
8.4.2 Checking procedure for the DIP-IPM inverter

RAS-(3-6)H(V)N(P/C)1E
High voltage discharge work for replacing parts
C A U T I O N
Electrical hazard. Risk of electrical shock. Perform this high voltage discharge work to avoid an electric shock.
1 Turn OFF the main switches and wait for three min-
utes. Make sure that no high voltage exists. If LED201
is ON after start-up and LED201 is OFF after turning
OFF power source, the voltage will decrease lower
than DC50V.
2 Connect connecting wires to an electrical soldering
iron
3 Connect the wires to terminals, P and N on DIP-IPM.
(The discharge voltage can perform even when con-
necting the wires to terminals
connector "PCN201")
sulting in hot soldering iron. Pay attention not to short-
circuit between terminal P(+) and N(-)
4 Wait for 2 or 3 minutes and measure the voltage once
again. Check to ensure that no voltage is charged.
Inverter module checking procedure
Rectifier circuit of inverter PCB
Internal circuit of rectified part of DIP-IPM
Remove all the terminals of the inverter PCB before
checking.
Non-faulty if [1] – [8] are checked and satisfied.
Measure with 1 kΩ range of a tester.
N O T E
DO NOT use a digital tester.
303
SMGB0087 rev.0 - 12/2013
#1(P) and #3(N) of
=> Discharging is started, re-
DIP-IPM
Plug
Electrical
soldering iron
Connecting wires
R
S
T
52C
8