TROUBLESHOOTING
Chap 6
[ 5 ] Unpleasant noises are emitted from motor or noises fluctuate
Possible Causes Check and Measures
(1) The specified carrier frequency
is too low.
Check the data of motor operation noise (Carrier frequency) (F26) and
motor operation noise (Tone) (F27).
Increase the carrier frequency (F26).
Change the setting of F27 to the appropriate value.
(2) Ambient temperature of inverter
is high. (In the selection of
carrier frequency automatic
reduction function (H98))
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 inverter by reducing the load. In the case
of funs/pumps, lower the frequency limiter Upper limit (F15).
NB) The release of H98 causes alarms
0h1
,
0h3
,
0lu
in some
cases.
(3) Resonance with the load. Check the machinery mounting accuracy or check whether there is
resonance with the mounting base.
Sort out the resonance cause by running the motor independently.
Avoid continuous running at the frequency range where the
resonance occurs by setting the jump frequency (C01-C04)
[ 6 ] Motor is not accelerated or decelerated according to set-up acceleration or
deceleration times
Possible Causes Check and Measures
(1) The inverter runs the motor with
S-curve or curvilinear pattern.
Check the data of function code H07 (Curve acceleration/ deceleration).
Set linear acceleration/deceleration. (H07=0)
Shorten the acceleration/deceleration times (F07, F08, E10 through
E15).
(2) The current limiting operation
prevented the output frequency
from increasing (during
acceleration).
Make sure that F43 (Current limiter (Mode selection)) is set to 2, 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 times (F07, F08, E10
through E15).
(3) The anti-regenerative control is
enabled (during deceleration).
Check the data of function code H69 (Anti-regenerative control (Mode
selection)).
Increase the deceleration time (F08, E11, E13, and E15).
(4) Overload. Measure the inverter output current.
Reduce the load. For fans or pumps, decrease the frequency limiter
Upper limit (F15). In winter, the load tends to increase.
(5) Torque generated by the motor
was insufficient.
Check that the motor starts running if the value of the torque boost
(F09*) is increased.
Increase the value of the torque boost (F09*).
(6) An external frequency
command potentiometer is used
for frequency setting.
Check that there is no noise in the control signal wires from external
sources.
Separate the signal wires from the main power wires as far as
possible.
Use shielded or twisted wires for control signals.
Connect a capacitor to the output terminal of the potentiometer or
insert a ferrite core on the signal wire. See Chapter 2 “2.2.6 [3]
Description of terminal functions (control circuit terminal) [12], [C1].”
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