Automatic Voltage Regulation (Avr); Software Brake Level - Delta VFD-E User Manual

Chapter 4 Parameters|
08.18

Automatic Voltage Regulation (AVR)

Settings
The rated voltage of the motor is usually 230V/200VAC 50Hz/60Hz 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.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.
Setting 0: when AVR function is enabled, the drive will calculate the output voltage by actual
DC-bus voltage. The output voltage won't be changed by DC bus voltage.
Setting 1: when AVR function is disabled, the drive will calculate the output voltage by DC-bus
voltage. The output voltage will be changed by DC bus voltage. It may cause insufficient/over
current.
Setting 2: the drive will disable the AVR during deceleration, such as operated from high speed
to low speed.
Setting 3: the drive will disable the AVR function at stop to accelerate the brake.
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.
Related parameter: Pr.01.16(Auto acceleration / deceleration (refer to Accel/Decel time
setting))

Software Brake Level

08.19
(the Action Level of the Brake resistor)
Settings
4-134
0 AVR function enabled
1 AVR function disabled
2 AVR function disabled for deceleration
3 AVR function disabled for stop
115/230V series: 370.0 to 430.0V
460V series: 740.0 to 860.0V
Revision Jan. 2009, 06EE, SW--PW V1.12/CTL V2.12
Factory Setting: 0
Unit: 0.1
Factory Setting: 380.0
Factory Setting: 760.0