Motor speed
varies during
operation.
There is a high variance in load.
Replace the motor and inverter with
models with increased capacity.
The input voltage varies.
Reduce input voltage variation.
Motor speed variations occur at a
specific frequency.
Adjust the output frequency to avoid
a resonance area.
The motor rotation
is different from
the setting.
The V/F pattern is set incorrectly.
Set a V/F pattern that is suitable for
the motor specification.
The motor
deceleration time
is too long even
with Dynamic
Braking (DB)
resistor
connected.
The deceleration time is set too long.
Change the setting accordingly.
The motor torque is insufficient.
If motor parameters are normal, it is
likely to be a motor capacity fault.
Replace the motor with a model with
increased capacity.
The load is higher than the internal
torque limit determined by the rated
current of the inverter.
Replace the inverter with a model
with increased capacity.
While the inverter
is in operation, a
control unit
malfunctions, or
noise occurs.
Noise occurs due to switching inside the
inverter.
Change the carrier frequency to the
minimum value.
Install a micro surge filter in the
inverter output.
When the
inverter is
operating, the
earth leakage
breaker is
activated.
An earth leakage breaker will interrupt
the supply if current flows to ground
during inverter operation.
Connect the inverter to a ground
terminal.
Check that the ground resistance is
less than 100Ω for 200 V inverters
and less than 10Ω for 400 V
inverters.
Check the capacity of the earth
leakage breaker and make the
appropriate connection, based on the
rated current of the inverter.
Lower the carrier frequency.
Make the cable length between the
inverter and the motor as short as
possible.
The motor
vibrates severely
and does not
rotate normally.
Phase-to-phase voltage of 3-phase
power source is not balanced.
Check the input voltage and balance
the voltage.
Check and test the motor’s
insulation.
The motor
makes humming,
or loud noises.
Resonance occurs between the motor's
natural frequency and the carrier
frequency.
Slightly increase or decrease the
carrier frequency.
Resonance occurs between the motor's
natural frequency and the inverter’s
output frequency.
Slightly increase or decrease the
carrier frequency.
Use the frequency jump function to
avoid the frequency band where
resonance occurs.
The motor
vibrates/hunts.
The frequency input command is an
external, analog command.
In situations of noise inflow on the
analog input side that results in
command interference, change the
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