Hitachi RAS-4.0UFESNH1 - Page 30

2. TROUBLESHOOTING
Table 4 Drive Fault Code (4.0/5.0/6.0/6.5HP)
Fau
l
t
co
de
Fault description
Possible reasons for abnormality
H
ow to de
a
l
with
1
Q axis c
urrent
detection
, failure
in
drive
control
1. Compressor wire is not connected
properly;
2. Bad driver board components;
3. Compressor start load is too large;
4. Compressor demagnetization;
5. Compress or oil shortage serious
wear of crankshaft;
6. The compressor insulation fails.
1. Check compressor wire;
2. Change driver board;
3. Turn on the machine after the
pressure is balanced again;
4. Change Compressor;
5. Change the Compressor;
6. Change the Compressor.
2
Phase current detection,
failure in drive control
1.Compressor voltage default phase;
2.Bad driver board components;
3.The compressor insulation fault.
1.Check c
ompressor wire c
onnection;
2.Cha
nge th
e
driver board;
3. Cha
nge th
e Compressor.
3
Initialization, phase
current imbalance
Bad driver board components. Change driver board .
4
Speed estimation,
failure in drive control
1.Bad driver board components;
2.Compressor shaft clamping;
3.The compressor insulation fa
ils.
1.Change driver board;
2.Change the Compressor;
3.Change the Compressor.
5 IPM FO output fault
1. System overload or current
overload;
2. Driver board fails;
3. Compressor oil shortage,serious
wear of crankshaft;
4. The compressor insulation fault.
1.Check the air-conditioner system;
2.Change the driver board;
3.Change the compressor;
4.
Change the compressor.
6
Communication
between driver board
and control board fault
1.Communication wire is not connected
well;
2. Driver bo
ard fault;
3.
Control board fault.
1. Check compressor wire connection;
2. Change the driver board;
3. Change the control board.
7
AC voltage,overload
voltage
1. Supply voltage input is too high or
too low;
2. Driver board fails.
1.Check power supply;
2.Cha
nge the driver board.
8
DC voltage,overload
voltage
1. Supply voltage input is too high ;
2. Driver board fault.
1. Check power supply;
2. Change the driver board;
9 AC voltage imbalance
Driver board fails. Change the driver board.
10
The PFC current
detection circuit fault
before compressor is
ON
Bad driver boa
rd components
Change the driver board.
11
AC voltage supply in
outrange
1.Power supply abnormal, power
frequency out of range;
2.Driver board fails.
1. Check the system;
2. Change the driver board.
12
Products of
single-phase PFC
over-current, FO
output low level
1.System overload, current is too large;
2. Driver board fault;
3. PFC fault.
1. Check the system;
2. Change the driver board;
3. Change PFC.
Inverter over current
(3-phase power supply
air conditioners)
1. System overload, current is too large;
2. Driver board fault;
3. Compressor oil shortage, serious
wear of crankshaft;
4. The compressor insulation fault.
1. Check the s
y
stem;
2.
Cha
nge th
e
driver board;
3. Change the compressor;
4. Change the compressor.
13 Inverter over current
1. System overload, current is too large;
2. Driver board fault;
3. Compressor oil shortage,serious
wear of crankshaft;
4. The compressor insulation fault.
1. Check the system;
2. Change the driver board;
3. Change the compressor;
4. Change the compressor.
14
PFC over
current(single-phase
air-conditioner)
1. System overload, current is too large;
2. Driver board fault;
3. PFC fault.
1. Check the system;
2. Change the driver board;
3. Change PFC.
Phase imbalance or
phase lacks or the
instantaneous power
failure (only for
3-phase power supply
air conditioners)
1.3-Phase voltage imbalance;
2.The 3-phase power s
upply phase
is lost;
3. Power supply wiring is wrong;
4. Driver bo
ard fault.
1, Check the power supply;
2. Check the power supply;
3. Check the power supply wiring
connection;
4.Change the driver board.
15
The instantaneous
power off detection
1.The power supply is not stable ;
2.The instantaneous power failure ;
3.Driver board fault;
1. Check the power supply;
2. Not fault;
3. Change the driver board.
28