Hitachi RAS-3-HVNC - Checking Procedure for Main Parts; Procedure for Checking the DIP-IPM Inverter for Indoor and Outdoor Units

8. Troubleshooting
277
SMGB0079 rev.0 - 01/2013
8
8.4 Checking procedure for main parts
8.4.1 Procedure for checking the DIP-IPM inverter for indoor and outdoor units

RAS-(3-6)H(V)N(P/C)E
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 minu-
tes. 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
#1(P) and #3(N) of
connector “PCN201”) => Discharging is started, re-
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.
DIP-IPM
Connecting Wires
Electrical
soldering iron
Plug
Inverter module checking procedure
• Rectier circuit of inverter PCB
Internal circuit of rectied part of DIP-IPM
Remove all the terminals of the inverter PCB before
checking.
Non-faulty if [1] – [8] are checked and satised.
Measure with 1 kΩ range of a tester.
R
S
T
52C
㧙
N O T E
DONOTuseadigitaltester.