LSIS LSLV-S100 - Page 403

Troubleshooting
389
Type
Cause
Remedy
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 200V inverters
and less than 10Ω for 400V 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 200m (50m 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.