LSIS 6731001500, User Manual

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573
Troubleshooting
Type Cause Remedy
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
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 It is difficult to decelerate sufficiently, Adjust the DC braking parameter.