Fuji Electric FRENIC-Multi - Page 162

6-6
Possible Causes What to Check and Suggested Measures
(3) Frequency switching or
multi-frequency
command was enabled.
Check whether the relay signal for switching the frequency
command is chattering.
Î If the relay has a contact problem, replace the relay.
(4) The connection
between the inverter
and the motor was too
long.
Check whether auto-torque boost or auto-energy saving operation
is enabled.
Î Perform auto-tuning of the inverter for every motor to be used.
Î Enable load selection for higher startup torque (F37, A13 = 1)
and check for any vibration.
Î Make the output wire as short as possible.
Once cancel all the automatic control systems--auto torque boost,
auto energy saving operation, overload prevention control, current
limiter, torque limiter, regenerative energy suppression, auto search
for idling motor speed, slip compensation, torque vector control,
and droop control, overload stop function, then check that the moto
r
vibration comes to a stop.
Î Cancel the functions causing the vibration.
Î Readjust the data of the output current fluctuation damping gain
(H80 and A41).
(5) The inverter output is
hunting due to vibration
caused by low stiffness
of the load. Or the
current is irregularly
oscillating due to special
motor parameters.
Check that the motor vibration is suppressed if you decrease the
level of F26 (Motor sound (Carrier frequency)) or set F27 (Moto
r
sound (Tone)) to "0."
Î Decrease the carrier frequency (F26) or set the tone to "0" (F27 =
0).
[ 5 ] If grating sound can be heard from motor
Possible Causes What to Check and Suggested Measures
(1) The carrier frequency
was set too low.
Check the data of function codes F26 (Motor sound (Carrie
r
frequency)) and F27 (Motor sound (Tone)).
Î Increase the carrier frequency (F26).
Î Readjust the setting of F27 to appropriate value.
(2) The ambient
temperature of the
inverter was too high
(when automatic
lowering of the carrier
frequency was enabled
by H98).
Measure the temperature inside the panel of the inverter.
Î If it is over 40qC, lower it by improving the ventilation.
Î Lower the temperature of the inverter by reducing the load. (In
the case of a fan or a pump, lower the setting data of the
frequency limiter (F15).)
Note: If you disable H98, an J or NW alarmmayoccur.
(3) Resonance with the load Check the precision of the mounting of the load or check whethe
r
there is resonance with the panel or likes.
Î Disconnect the motor and run it without the inverter, and
determine where the resonance comes from. Upon locating the
cause, improve the characteristics of the source of the
resonance.
Î Adjust the settings of C01 (Jump frequency 1) to C04 (Jump
frequency (Hysteresis width)) so as to avoid continuous running
in the frequency range causing resonance.