Chapter 4 Parameter SettingsDD Series

This parameter determines the PWM carrier frequency of the AC motor drive.

Carrier

Acoustic

Electromagnetic

Heat

Current

Frequency

Noise

Noise or leakage

Dissipation

Wave

 

 

current

 

 

1kHz

Significant

Minimal

Minimal

Minimal

 

 

 

 

8kHz

 

 

 

 

15kHz

Minimal

Significant

Significant

Significant

 

From the table, we see that the PWM carrier frequency has a significant influence on the electromagnetic noise, AC motor drive heat dissipation, and motor acoustic noise. If noises from ambient environment is greater than motor noise, lower PWM carrier frequency will help to lower the temperature of AC motor drive. When PWM carrier frequency is high, though the drive will operate more quietly, but wiring and interference may have problem.

Model VFDXXXDDXXE: Settings 02~10kHz

Auto Voltage Regulation (AVR) Function

Control mode VF VFPG SVC FOCPG FOCPM

Factory setting: 0

 

Settings 0: Enable AVR

 

 

 

1: Disable AVR

 

 

 

2: Disable AVR when deceleration stop

 

The rated voltage of the motor is usually AC220V/200V 60Hz/50Hz and the input voltage of the AC motor drive may vary between 180V to 264 VAC 50Hz/60Hz. Therefore, when the AC motor drive is used without AVR function, the output voltage will be the same as the input voltage. When the motor runs at voltages exceeding the rated voltage with 12% - 20%, its lifetime will be shorter and it can be damaged due to higher temperature, failing insulation and unstable torque output.

AVR function automatically regulates the AC motor drive output voltage to the Maximum Output Voltage (Pr.1-02). For instance, if Pr.1-02 is set at 200 VAC and the input voltage is at 200V to 264VAC, then the Maximum Output Voltage will automatically be reduced to a maximum of 200 VAC.

When motor stops with deceleration, it will shorten deceleration time. When setting this parameter to 02 with auto acceleration/deceleration, it will offer a quicker deceleration.

Source of the Master Frequency Command

Control mode VF VFPG SVC FOCPG FOCPM

Factory setting: 1

 

Settings 0: by digital keypad input

 

 

 

1: by external terminal

 

 

 

2: by RS-485 serial communication

 

 

 

 

 

This parameter is used to set the source of the operation command.

 

Demo Mode

Control mode VF VFPG SVC FOCPG FOCPM

Factory setting: 0

 

Settings 0: Disable

 

 

 

1: Display demo action

 

 

 

 

 

Frequency Testing Command

Control mode VF VFPG SVC FOCPG FOCPM

Factory setting: 0

 

Settings 0~120.00Hz

 

 

 

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3Com VFD-D D manual Auto Voltage Regulation AVR Function, Source of the Master Frequency Command, Demo Mode

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