Hitachi RAS-4-HNCE - RAS-3 HVNPE

8. Troubleshooting
280
SMGB0079 rev.0 - 01/2013
• Checking Method of Fuse for fan motor protection (EF1)
(Measure the resistance under 1 kΩ range of a circuit tester.)
N O T E
DONOTuseadigitaltester.
By placing the
+
and
-
side of tester to EF1 on inverter
PCB, measure the resistance.
If the resistance is 0Ω, it is normal.
Circuit
Tester
Place wires to
specified terminal.
+
-
EF1
Refer to (1)
“Detail of Check Points”
about details.
Contact with specied terminals
to measure.
Tester

RAS-(8-12)HN(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 minutes. Check
to ensure that no high voltage exists. If LED2 is ON after start-
up and LED2 is OFF after turning OFF power source, the volta-
ge will decrease lower than DC50V.
2 Connect connecting wires to an electrical solder bit.
3 Connect the wires to terminals, P and N on IPM. => Discharging
is started, resulting in hot solder bit. 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.
1
2
3
4
Solder bit
Plug
Connecting wires
Transistor module