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 240 V inverters and less
than 10Ω for 480 V inverters.
Check the capacity of the earth leakage
breaker, base on the rated input current
of the inverter.
Reduce 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.
The voltage between phases is not
balanced.
Check the input voltage and balance the
voltage.
Check and test the motor’s insulation.
Check motor for mechanical issues.
The motor makes
humming, or loud
noises.
Resonance occurs between the motor's
natural frequency and the carrier
frequency.
Slightly increase or decrease the carreir
frequency.
Resonance occurs between the motor's
natural frequency and the inverter’s
output frequency.
Slightly increase or decrease the
operating frequency.
Use the frequency jump function to avoid
the frequency band where resonance
occurs.
The motor
vibrates/hunts.
The analog frequency reference contains
induced noise.
Check the routing, grounding and
shielding of the analog signal cable.
Add filtering to the analog cable.
Increase the analog input filter time
constant (In.07).
The wiring length between the inverter
and the motor is too long.
Ensure that the cable length between the
inverter and the motor is less than 665 ft.
(200 m). For smaller inverters (< 5 HP),
less than 165 ft. (50 m).
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 parameters Brake
Current and Brake Time.
Caution: Avoid excessive Motor heating.
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 above the
upper limit frequency.
Check Frequency Limit settings.
The analog frequency reference is lower
(due to losses) at the inverter terminals.
Check scaling of the analog frequency
reference.
Because the load is too heavy, the stall
prevention function is working.
Replace the motor and/or the inverter
with larger models.
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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