Delta Electronics AC Motor Drive VFD-E - Manual (Page 162)

Chapter 4 Parameters|
Revision June 2008, 04EE, SW--PW V1.11/CTL V2.11 4-109
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
(the Action Level of the Brake resistor) Unit: 0.1
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
08.23 OOB Average Sampling Angle
Settings Read-only Factory 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