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Pulse-by-
pulse
current
limit fault
FU40
Load is too heavy or
locked-rotor occurs on
Motor.
Reduce load or check motor and
mechanical conditions
The AC drive power
class is small.
Replace a drive of larger power class.
Motor
switchover
fault during
running
FU41
Motor switchover via
terminal during drive
Running of the AC drive.
Perform motor switchover after the
AC drive stops.
Speed error FU42
Encoder parameters are
set improperly.
Set encoder parameters properly.
Motor auto-tuning is not
performed.
Perform motor auto-tuning.
P9-69 (detection level of
speed error) and
P9-70 (detection time of
speed error) are set
Incorrectly.
Set data correctly based on actual
condition
Motor over
speed
FU43
Encoder parameters are
set improperly.
Set encoder parameters properly.
Motor auto-tuning is not
performed.
Perform motor auto-tuning.
P9-67 (Over speed
detection level) and
P9-68 (Over speed
detection time) are set
Incorrectly.
Set data correctly based on the actual
situation.
No.
Error
Reason
Possible Solution
1
There
is
no
display
while
power-on.
The mains voltage is not
input or too low.
Check the power supply.
The switching power supply
on drive board of the AC
Drive is faulty.
Check bus voltage.
Wires between control board
and drive board and
Between control board and
operating panel break.
Re-plug the 30-core cable
Pre-charge resistor of the AC
drive is damaged.
Contact the agent
