10 Troubleshooting
Troubleshooting procedure
SMGB0091 rev.2 - 11/2015
214
RASC-(8/10)HNPE
No
Check wiring and
cable capacity
Frequency can
increase higher than
60 Hz
Restart the operation
Check the wiring,
PCB4 and capacitors
(CB1, CB2). *2).
In case the wiring is
correct, replace the
PCB4.
Connect correctly
Yes
Yes
No
Yes
No
Yes
Compressor stops
immediately
(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?
Is the LED201
on PCB4 ON after
magnetic contactor for
compressor (CMC) is
turned ON?
How is
compressor
operation?
Is connection
correctly between
IPM and capacitors (CB1
and DB2), DCL or CMC?
Is the power
supply voltage 323V
during operation?
Is the magnetic
contactor for
compressor (CMC)
function properly?
No
Yes
Faulty PCB4.
Replace it.
Yes
Is DC voltage over
460V between terminals
“P” and “N” of IPM?
Yes
Check capacitors
(CB1, 2)
Replace capacitors
*1)
Faulty PCB4.
Replace it.
*Be careful especially because
of high voltage
(Loose wiring,
change of
colour)
Fault
Normal
Direct current
Measuring position
Measuring range: DC1000V
IPM
Tester
PCB1: Control PCB of RASC unit
PCB4: Inverter PCB of RASC unit
?
N O T E
• *1): If capacitor has high voltage, perform the high voltage discharge work. Refer to the paragraph
in section
“10.4.2 Checking procedure for the inverter PCB”.
• *2): Regarding replacing or checking method for the inverter PCB, refer to the paragraph
in section