LS ELECTRIC LSLV-L100 Series, Руководство пользователя

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Troubleshooting
354
Fault Cause Remedy
deceleration time is
too long even with
a Dynamic Braking
(DB) resistor
connected.
Motor torque is too low.
If motor parameters are normal, an
underrated motor is the likely cause.
Replace the motor with a model with
increased capacity.
The load is too high for the inverter’s
rated torque limit. Replace the inverter with a model with
increased capacity.
During inverter
operation, a control
unit malfunction
occurs or switching
noise can be
heard.
Switching inside the inverter causes the
noise.
Change the carrier frequency to the
minimum value.
Install a micro surge filter (MSF) in the
inverter output.
During inverter
operation, the earth
leakage circuit
breaker activates.
An earth leakage circuit breaker
interrupts power supply if current flows
to ground during inverter operation.
Ensure the inverter is connected to
ground.
Check that the ground resistance is
less than 10Ω.
Check the rating and connections of
the earth leakage circuit breaker.
Reduce the carrier frequency.
Ensure the cable length between the
inverter and the motor is as short as
possible.
The motor vibrates
severely and does
not rotate normally.
The 3-phase power supply is out of
balance.
Check the input voltages and balance
the phases.
Check and test the motor’s insulation.
The motor hums or
makes loud noises.
Resonance occurs between the motor’s
mechanical natural frequency and the
carrier frequency.
Increase or decrease the carrier
frequency slightly.