4-12
D Motor Response Speed Waveform Resonates
• The
output frequency of the Inverter and
the natural frequency of the mechanical system are resonat
-
ing.
Use the frequency jump function with n058 to n060 so that the mechanical system will not resonate or
install the motor on a rubber vibration insulator.
• PID parameters are improper.
Adjust
the PID parameters if the response speed waveform of the motor vibrates while the Inverter is
performing
PID control. Set n087 to a longer integral time if the cycle of the vibration is long and set
n088
to a shorter
derivative time if the cycle of the vibration is short. Refer to
page
3-36
for PID adjust
-
ments.
• Energy-saving parameters are improper.
If the response speed waveform of the motor vibrates while the Inverter is in energy-saving mode,
measure the cycle of the vibration.
If the cycle of the vibration coincides with the mean power time set with n099, the search operation
function
is not
working properly
. Set the search operation voltage limit with n100 to 0 to invalidate the
search
operation mode or set the 100%
and 5% search operation voltage steps with n101 and n102 to
smaller values so that the output voltage range of the Inverter performing search operation will be nar
-
row.
D Rotating Motor Drops Rotation Speed for an Instant after Rotation Speed of Motor
Is Accelerated.
Energy-saving parameters are improper.
The
value of the energy-saving coef
ficient K2 set with n092 is improper if
the motor drops its rotation
speed
for an instant after the rotation speed of the motor is accelerated by the Inverter in energy-saving
mode.
Reset
K2 to
the value for the capacity of a motor one rank lower than the motor in use. Refer to
page
3-26
.
H Motor Continues to Rotate After Inverter Output is Shut OFF
The DC control current is insufficient to stop the motor.
Take the following actions to adjust the DC control current.
S Set the DC control current with n064 to a higher current.
S Set the DC braking time with n065 to a longer time.
H OV is Detected or Fan Stalls When Operated
The DC control current is insufficient to start the fan.
OV will be detected or the fan will stall if the fan is operated while the fan is rotating.
To
prevent this, reduce the rotation speed of the fan with a suf
ficient DC control current set with n066.
Operation Chapter 4
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