Delta Electronics VFD007S23A manual ParametersVFD-S Series

			Chapter 5 ParametersVFD-S Series
8-15	Automatic Voltage Regulation (AVR)
				Factory Setting: d0
	Settings	d0	AVR function enabled
		d1	AVR function disabled
		d2	AVR function disabled when deceleration

AVR function automatically regulates the AC 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.

Without AVR function, the Maximum Output Voltage may vary between 180V to 264VAC, due to the input voltage varying between 180V to 264 VAC.

Selecting program value d2 enables the AVR function and also disables the AVR function during deceleration. This offers a quicker deceleration.

8-16	Software Braking Level		Unit: 1
	Settings	230V series: d350 to d450V	Factory Setting: d380
		460V series: d700to d900V	Factory Setting: d760

During deceleration, the DC-bus voltage will increase due to motor regeneration. When DC bus voltage level exceeds the Software Braking Level, the DC brake output pins (B1, B2) will be activated.

8-17	Lower Bound of DC Braking Start-up Frequency		Unit: 0.1
	Settings	d0.0 to d400 Hz	Factory Setting: d0.0

The setting frequency is lower than Pr.8-17, the DC Braking will not be activated when stops.

Revision August 2006, SE08, SW V2.61 5-61