Mitsubishi FR - S500 instruction manual PWM carrier frequency, You can change the motor sound

CAUTION

•The cumulative number in Pr. 69 is incremented by "1" when retry operation is regarded as successful, i.e. when normal operation is continued without the protective function (major fault) activated during a period four times longer than the time set in Pr. 68.

•If the protective function (major fault) is activated consecutively within a period four times longer than the above waiting time, the control panel may show data different from the most recent data or the parameter unit (FR-PU04) may show data different from the first retry data. The data stored as the error reset for retry is only that of the protective function (major fault) which was activated the first time.

•When an inverter alarm is reset by the retry function at the retry time, the stored data of the electronic overcurrent protection, etc. are not cleared. (Different from the power-on reset.)

CAUTION

When you have selected the retry function, stay away from the motor and machine unless required. They will start suddenly (after the reset time has elapsed) after occurrence of an alarm.

When you have selected the retry function, apply in easily visible places the CAUTION seals supplied to the instruction manual (basic).

2.10.2 PWM carrier frequency

You can change the motor sound.

Parameter	Name	Factory	Setting	Remarks
		Setting	Range
70	Soft-PWM setting	1	0, 1	Setting is enabled when
	PWM frequency
72		1	0 to 15	Pr. 30 = "1"
	selection

REMARKS

By parameter setting, you can select Soft-PWM control which changes the motor tone.

Soft-PWM control changes motor noise from a metallic tone into an unoffending complex tone.

<Setting>

Parameter

Number

Setting

Description

70	0	Soft-PWM invalid
	1	When any of "0 to 5" is set in Pr. 72, Soft-PWM is made valid.
		PWM carrier frequency can be changed.
72	0 to 15	The setting displayed is in [kHz].
		Note that 0 indicates 0.7kHz and 15 indicates 14.5kHz.

REMARKS

An increased PWM frequency will decrease motor noise but noise and leakage current will increase. Take proper action (Refer to pages 18).

Metallic sound may be generated from the motor at sudden deceleration but it is not a fault.

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