Delta Electronics VFD-E manual 08.19, 08.20, 08.21, 08.22

Chapter 4 Parameters

AVR function automatically regulates the AC motor drive output voltage to the Maximum Output Voltage (Pr.01.02). For instance, if Pr.01.02 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 200VAC.

When the motor ramps to stop, the deceleration time is longer. When setting this parameter to 2 with auto acceleration/deceleration, the deceleration will be quicker.

08.19	Software Brake Level		Unit: 0.1
	(the Action Level of the Brake resistor)
	Settings	115/230V series: 370.0 to 430.0V	Factory Setting: 380.0
		460V series: 740.0 to 860.0V	Factory Setting: 760.0

This parameter sets the DC-bus voltage at which the brake chopper is activated. This parameter will be invalid for Frame A models (VFD002E11A/21A/23A, VFD004E11A/21A/23A/43A, VFD007E21A/23A/43A and VFD022E23A/43A) without brake chopper for which BUE brake unit must be used.

08.20	Compensation Coefficient for Motor Instability		Unit: 0.1
	Settings	0.0~5.0	Factory Setting: 0.0

The drift current will occur in a specific zone of the motor and it will make motor instable. By using this parameter, it will improve this situation greatly.

The drift current zone of the high-power motors is usually in the low frequency area. It is recommended to set to more than 2.0.

08.21	OOB Sampling Time		Unit: 0.1
	Settings	0.1 to 120.0 sec	Factory Setting: 1.0
08.22	Number of OOB Sampling Times		Unit: 1
	Settings	0.00 to 32	Factory Setting: 20

08.23OOB Average Sampling Angle

Settings Read-onlyFactory Setting: #.#

The OOB (Out Of Balance Detection) function can be used with PLC for washing machine. When multi-function input terminal is enabled (MI=26), it will get Δθ value from the settings of Pr.08.21 and Pr.08.22. PLC or the host controller will decide the motor speed by this t Δθ value (Pr.08.23). When Δθ value is large, it means unbalanced load. At this moment, it needs

Revision June 2008, 04EE, SW--PW V1.11/CTL V2.11 4-109