3-30
Problem RemarksProbable cause
Inverter does not perform
effective energy-saving control
Load factor of the motor is too
large
The Inverter does not perform effective
energy-saving control if the load factor of
the motor is too large.
Reference: Energy-saving control of motor
with 7.5-kW output
Energy saved (W)
Output frequency: 60 Hz
Load factor (%)
Constantly rotating motor
drops its rotation speed for a
moment
Value of the energy-saving
coefficient K2 is too small and
the ideal output voltage
calculated by the Inverter is
low
Set K2 with n096 according to the capacity
of the motor.
Reset K2 to the value for the capacity of a
motor one rank lower than the motor in
use if the same trouble occurs after K2 is
set according to the capacity of the motor.
Motor vibrates or does not
rotate smoothly when the load
is light
Mechanical system is
resonating with the Inverter
Set the mean power time with n099 to a
larger value.
Motor stalls Output voltage is too small Set the lower output voltage limits with
n097 and n098 to larger values.
Set the energy-saving coefficient K2 with
n096 to a larger value.
Reset K2 to the value for the capacity of a
motor one rank lower than the motor in
use if the same trouble occurs after K2 is
set according to the capacity of the motor.
Motor changes its rotation
speed periodically in
synchronization with the mean
power time
Speed ripples are generated
by the search operation
voltage change rates
Set the values of n101 and n102 to smaller
values.
Set the search operation voltage limit with
n100 to 0 so that the search operation
function will not work.
Motor is overloaded only when
the Inverter performs
energy-saving control
although the weight of the load
is the same as or less than the
rated output torque of the
motor
Search operation function is
not working and the output
voltage is high
Set the search operation voltage limit with
n100 to a smaller value.
Set the search operation voltage limit with
n100 to 0 so that the search operation
function will not work.
Preparing for Operation Chapter 3
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