Toshiba VF-AS1 PWM carrier frequency, Gradient bias adjustment of analog monitor output

E6581301

■Gradient bias adjustment of analog monitor output

Here is an example of the adjustment of output from 0-20mA → 20-0mA, 4-20mA using the FM terminal. ￿

￿￿￿￿=￿, ￿￿￿￿=￿		￿￿￿￿=￿, ￿￿￿￿=￿￿
	(mA)		(mA)
	20		20

0

0100%

￿￿￿￿=￿, ￿￿￿￿=￿￿￿

(mA)

20

large

4

0

0100%

￿￿￿￿=￿, ￿￿￿￿=￿￿￿

(mA)

20

small￿

4

		0			0
			0	100%		0	100%
	!The analog output inclination can be adjusted using the parameter ￿￿.
5.17	PWM carrier frequency							5

￿ ￿￿￿

: PWM carrier frequency

￿￿￿￿￿￿: Random mode

￿￿￿￿￿￿: Carrier frequency control mode selection

•Function

1)The sound tone of acoustic noise can be changed by adjusting the PWM carrier frequency. This parameter is also effective in preventing the motor from resonating with its load machine or its fan cover.

2)In addition, this parameter reduces the electromagnetic noise generated by the inverter. Reduce the carrier frequency to reduce electromagnetic noise. Note: Although the electromagnetic noise level is reduced, the magnetic noise of the motor is increased.

￿3) The random mode reduces motor magnetic noise by changing the pattern of the reduced carrier frequency.

4)To set the parameter ￿￿￿￿ to ￿ or ￿ has the effect of suppressing voltage serge to the motor. Reduce the carrier frequency to less than 4kHz if the wiring between the inverter and motor is long (20 to 100m as a guide).

5)In case of using the sinusoidal filter, set the parameter ￿￿￿￿ to ￿ or ￿.

This parameter works at 200V-55kW or more and 400V-90kW or more models.

[Parameter setting]

Title	Function	Adjustment range	Default setting
￿￿	PWM carrier frequency	￿￿￿~￿￿￿kHz (￿￿￿~￿￿￿kHz) [Note 1]	According to model
			￿ Refer to page K-48.
￿￿￿￿	Random mode	￿:Disabled, ￿: Enabled	￿￿
		￿:Not decrease carrier frequency automatically
		￿:Decrease carrier frequency automatically
		￿:Not decrease carrier frequency automatically,
		400V class supported	According to model
	Carrier frequency	￿:Decrease carrier frequency automatically,
￿￿￿￿			￿ Refer to page K-48
	control mode selection	400V class supported
			[Note 12]￿
		￿:Not decrease carrier frequency automatically,
		with sinusoidal filter [Note 11]
		￿:Decrease carrier frequency automatically, with
		sinusoidal filter [Note 11]

Note 1: For 200V-55/75kW models and 400V-90kW to 400V-500kW models, the carrier frequency is between 2.5

and 8.0kHz inclusive.

E-31