Fuji Electric FRENIC-HVAC User Manual page 662

[ 5 ] Grating sound is heard from the motor or the motor sound fluctuates.
Possible Causes
(1) The specified carrier
frequency is too low.
(2) The ambient temperature of
the inverter was too high
(when automatic lowering of
the carrier frequency was
enabled by H98).
(3) Resonance with the load.
[ 6 ] The motor does not accelerate or decelerate within the specified time.
Possible Causes
(1) The inverter runs the motor
with S-curve or curvilinear
pattern.
(2) The current limiting operation
prevented the output frequency
from increasing (during
acceleration).
(3) The automatic deceleration
(Anti-regenerative control) is
enabled during deceleration.
(4) Overload.
(5) Torque generated by the motor
was insufficient.
(6) An external frequency
command potentiometer is
used for frequency setting.
What to Check and Suggested Measures
Check the data of function codes F26 (Motor sound (Carrier frequency))
and F27 (Motor sound (Tone)).
 Increase the carrier frequency (F26).
If the carrier frequency is set too high, current derating is required.
For details, refer to Section 2.6 "Derating of Rated Output Current."
 Change the setting of F27 to appropriate value.
Measure the temperature inside the panel where the inverter is mounted.
 If it is over 40°C, lower it by improving the ventilation.
 Lower the temperature of the inverter by reducing the load. (For fans
or pumps, decrease the frequency limiter value (F15).)
Note: If you disable H98, an OH1, OH3, or OLU alarm may occur.
Check the machinery mounting accuracy or check whether there is
resonance with the mounting base.
 Disconnect the motor from the machinery and run it alone, then find
where the resonance comes from. Upon locating the cause, improve
the characteristics of the source of the resonance.
 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.
What to Check and Suggested Measures
Check the data of function code H07 (Acceleration/deceleration
pattern).
 Select the linear pattern (H07 = 0).
 Shorten the acceleration/deceleration time (F07, E10 through E15).
Make sure that F43 (Current limiter (Mode selection)) is set to "2:
Enable during acceleration and at constant speed," then check that the
setting of F44 (Current limiter (Level)) is reasonable.
 Readjust the setting of F44 to appropriate value, or disable the
function of current limiter with F43.
 Increase the acceleration/deceleration time (F07, F08, E10 through
E15).
Check the data of function code H69 (Automatic deceleration (Mode
selection)).
 Increase the deceleration time (F08, E11, E13, and E15).
Measure the output current.
 Reduce the load (For fans or pumps, decrease the frequency limiter
value (F15).) (In winter, the load tends to increase.)
Check that the motor starts running if the value of the torque boost (F09)
is increased.
 Increase the value of the torque boost (F09).
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 control signals.
 Connect a capacitor to the output terminal of the potentiometer or
set a ferrite core on the signal wire. (Refer to Chapter 2.)
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