FujiFilm Frenic-Mini Instruction Manual page 125

[ 4 ] If the speed variation and current vibration (such as hunting) occur at the regular
speed
Possible Causes
(1) The frequency command
fluctuated.
(2) The external frequency
command device was
used.
(3) The slip compensation
gain was too large.
(4) The vibration system
having low stiffness in a
load caused hunting or
the current is irregular
due to special motor
constants.
[ 5 ] If grating sound can be heard
Possible Causes
(1) The carrier frequency was
set too low.
[ 6 ] The motor does not accelerate and decelerate at the set time.
Possible Causes
(1) The inverter ran the motor
by S-curve or curvilinear
pattern.
(2) The current limiting
prevented the output
frequency from
increasing.
What to Check and Suggested Measures
Check the signals for the frequency command with Menu #4
"I/O checking" using the keypad.
Increase the filter constants (C33 and C38) for the
frequency command.
Check that there is no noise in the control signal wires from
external sources.
Isolate the control signal wires from the main circuit wires
as far as possible.
Use shielded or twisted wires for the control signal.
Check that the motor vibration is absorbed if the slip
compensation (P09) is cancelled.
Correct or cancel the slip compensation (P09) data.
Cancel the automatic control system (automatic torque boost,
slip compensation,
prevention control, current limiting) and check that the motor
vibration is suppressed (F37, P09, H70, and F43).
Cancel the functions causing the vibration.
Readjust the data of the oscillation suppression gain (H80)
currently set.
Check that the motor vibration is suppressed if you decrease
the carrier frequency (F26) or set the sound tune to level 0
(F27 =0).
Decrease the carrier frequency (F26) or set the sound tune
level 0 (F27=0).
What to Check and Suggested Measures
Check the data of function codes F26 and F27.
Increase the carrier frequency (F26).
Select the optimal value to the selection function (F27).
What to Check and Suggested Measures
Check the data of function code H07.
Select the linear pattern.
Check that current limiting is enabled with Menu #3 "Drive
monitoring" and check the current limiting level (F44) using
the keypad.
Change the current limiting level (F44) to a correct value.
Increase the acceleration and deceleration time (F07, F08,
E10, and E11).
6-6
energy saving operation, overload