Fuji Electric FRN355VG1S-4J [1008/1046] Grating sound is heard from the motor or the motor sound fluctuates

Fuji Electric FRN75VG1S-2J [1008/1046] Grating sound is heard from the motor or the motor sound fluctuates
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Possible Causes What to Check and Suggested Measures
(5) The machinery is hunting
due to vibration caused by
low rigidity of the load. Or
the current is irregularly
oscillating due to special
motor parameters.
Once disable all the automatic control systems (speed control, auto torque
boost, current limiter, torque limiter and droop control), then check that the
motor vibration comes to a stop.
Î Under vector control with/without speed sensor
, readjust the speed
control system. (F61 through F66, C40 through C45, C50 through C55)
Î Disable the automatic control system(s) causing the vibration.
(6) Function code settings do
not agree with the motor
characteristics.
For exclusive motors for the FRENIC-VG: Check whether the setting of
function code P02 matches the specification of the connected motor.
Î Correct the data of P02.
For other motors:
Î Perform auto-tuning.
(7) Load is fluctuating. Under vector control with/without speed sensor
Check whether automatic speed regulator (ASR) is properly configured.
(F61 through F66, C40 through C45, C50 through C55)
Î Readjust the ASR setting.
[ 5 ] Grating sound is heard from the motor or the motor sound fluctuates.
Possible Causes What to Check and Suggested Measures
(1) The specified carrier
frequency is too low.
Check the data of function code F26 (Motor sound (Carrier frequency)).
Î Increase the data of F26.
(2) The surrounding
temperature of the inverter
was too high.
Measure the temperature inside the panel where the inverter is mounted.
Î If it is over 40°C, lower it by improving the ventilation.
Î Lower the temperature of the inverter by reducing the load.
(3) Resonance with the load. Check the machinery mounting accuracy or check whether there is
resonance with the mounting base.
Î Disconnect the motor from the machinery and run it alone to find where
the resonance comes from. Upon locating the cause, improve the
characteristics of the source of the resonance.
Î Adjust the jump speed (C01 through C04) to avoid continuous running
in the frequency range causing resonance.
Î Specify the observer (H47 through H52, H125 through H127) to
suppress vibration. (Depending on the characteristics of the load, this
may take no effect.)
Î Decrease the P gain of the auto speed regulator (ASR). (F61, C40, C50,
C60)
[ 6 ] The motor does not accelerate or decelerate within the specified time.
Possible Causes What to Check and Suggested Measures
(1) The inverter runs the motor
with S-curve acceleration/
deceleration.
Check the data of function codes F67 through F70 (S-curve acceleration/
deceleration pattern).
Î Select the linear pattern (F67 through F70 = 0).
Î Decrease the acceleration/deceleration time (F07, F08, C46, C47, C56,
C57, C66, C67).
Under V/f control
(2) The current limiting
operation prevented the
output frequency from
increasing (during
acceleration).
Check whether the acceleration time and torque boost are properly
specified.
Î Increase the data of F07, C35, C46, C56 or C66 (acceleration time).
Î Decrease the torque boost (P35, A55, A155) and restart the inverter to
check that the speed increases.

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