E6580516
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1_
(Special Control Parameters)
1·-,-
,
,-
-
PWM
carrier
frequency
The motor's resonant acoustic noise can be changed by changing the PWM carrier frequency. If resonance
occurs between the motor and the
load machine or motor fan cover, change the PWM carrier frequency.
The adjustment range for PWM carrier frequency is based on the
following table.
Inverter capacity
Adjustment range
1 SkW and
smaller
0.5-17kHz
18.SkW and larger
0.5-15kHz
200V units : 75kW and larger
0.5-SkHz
400V units :
11
OkW
and larger
*At
low-speed and very high-speed operation, the carrier frequency will be automatically adjusted to
meet motor drive requirements.
*
If the carrier frequency is set higher than the default setting value, the overload trip level will
automatically
be reduced, which may result
in
more frequent overload trips.
* 1
SkW
and smaller units: if the standard 1 SkHz settings
is
changed to 17kHz, the overload trip level will
be
reduced 4% for 200V units and 6% for 400V units.
18.SkW and
larger units: if the standard 12kHz setting is changed to 1 SkHz, the overload trip level will
be reduced 7% for 200V units and
11
% for 400V units.
75kW and
larger units: if the standard 2.2kHz setting is changed to SkHz, the overload trip level will be
reduced 28% for
200V units.
11
OkW
and larger units: if the standard 2.2kHz setting
is
changed to SkHz, the overload trip level will be
reduced 39% for
400V units.
1 SkW and
smaller for 400V units.
Output
current
[%]
100
-----
94
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-----
--
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-------
--
-~
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15
17
[kHz]
PWM
carrier
frequency
-
71
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