83
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
input filter time constant (IN-07).
The wiring length between the
inverter and the motor is too long.
Ensure that the total cable length
between the inverter and the motor
is less than 200 m (50 m for motors
rated 3.7 kW or lower).
The motor does
not come to a
complete stop
when the
inverter output
stops.
It is difficult to decelerate sufficiently,
because DC braking is not operating
normally.
Adjust the DC braking parameter.
Increase the set value for the DC
braking current.
Increase the set value for the DC
braking stopping time.
The output
frequency does
not increase to
the frequency
reference.
The frequency reference is within the
jump frequency range.
Set the frequency reference higher
than the jump frequency range.
The frequency reference is exceeding
the upper limit of the frequency
command.
Set the upper limit of the frequency
command higher than the
frequency reference.
Because the load is too heavy, the
stall prevention function is working.
Replace the inverter with a model
with increased capacity.
The cooling fan
does not rotate.
The control parameter for the cooling
fan is set incorrectly.
Check the control parameter
setting for the cooling fan.
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