Hitachi RAS-(2-6)HVNP1(E), Service Manual

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8 Troubleshooting
236
SMGB0087 rev.0 - 12/2013
RAS-(3-6)H(V)NP1E / RAS-(8-12)HN(P/C)(E)
No
Check wiring and
cable capacity
Frequency can in-
crease higher than
60 Hz
Restart the operation
Check the wiring,
PCB2 and capacitors
(CB). *2). In case the
wiring is correct,
replace the PCB2
Connect correctly
Yes
Yes
No
Yes
No
Yes
Compressor stops im-
mediately
(lower than 20 Hz)
Compressor stops
when frequency
increase. (Approx.
20 Hz to 60 Hz)
Fault magnetic
contactor.
Replace it.
No
No
No
Is the power
supply voltage
400V±10%?
Does the
voltage fall during
operation by operation of
other apparatus?
Does LED201
on PCB2 ON after
compressor’s
electromagnetic switches
(CMC1) turn ON?
How is
compressor
operation?
Is connection
correctly between
IPM and capacitors (CB1
and DB2), DCL or
CMC1?
Is the power
supply voltage 323V
during operation?
Does the
magnetic contactor
function properly?
No
Yes
Faulty PCB2.
Replace it.
Yes
Is DC voltage
over 460V?
Yes
Check capacitors
(CB1, 2)
Replace capacitors
Faulty PCB2.
Replace it.
*Be careful especially because
of high voltage (Loose wiring,
change of color)
Fault
Normal
N O T E
• The indicated voltage is for three phase models. The power supply volta-
ge for single phase models is 220V and 187V during operation.
• *1): If capacitor has high voltage, perform the high voltage discharge work
refer to the item ”8.4.7 Checking procedure for other parts” .
• *2): Regarding replacing or checking method for the inverter PCB, refer to
the item “8.4.7 Checking procedure for other parts”
PCB1: Control PCB in outdoor unit
PCB2: Inverter PCB in outdoor unit
Direct current
Measuring position
Measuring range: DC1000V