108
7
Troubleshooting
5
Troubleshooting
Diagnosis Countermeasures
1
Applicable Models
AKZ**A (All series)
2
Methods of Malfunction Detection
Detect according to voltages of
the inverter power supply DC
unit.
3
Malfunction Decision Conditions
Class Conditions
70
When the main circuit
voltage is insufficient.
71
When the main circuit
voltage does not rise due
to charging circuit failure.
When the relay of the
noise filter board is faulty.
4
Supposed Causes
1Inadequate power supply
voltage
1Instantaneous power failure
1Faulty noise filter board
(A3P)
Control panel display
U2
Low voltage (Inverter Main Circuit DC voltage)
YES
Instantaneous
power failure of the power
supply voltage occurs
frequently.
NO
Remove the cause of
voltage drop.
Replace the noise filter
board (A3P).
(See page 123/138)
The surge current
limitation circuit preventive
function is actuated. Turn
off the power supply, and
after a lapse of two
minutes or longer, turn on
the power supply again.
YES
The power
is turned ON/OFF
frequently.
NO
Connect the connectors
of DCL and inverter
board (A2P), DCL1 and
DCL2.
YES
DCL is not connected.
NO
NO
Check the connection
and broken wire of the R
(Red), S (White), T
(Black) of the inverter
board (A2P), F504,
F505, F506 of the noise
filter board (A3P).
YES
There is any
broken wiring or disconnection
of connector.
00_PB00540A_M10.indb 108 2023/08/09 12:59:07
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