Pwm Carrier Frequency - Toshiba TOSVERT VF-A5 Instruction Manual

E6580516
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(Special Control Parameters)
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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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15 17 [kHz]
PWM carrier frequency
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