Delta VFD-B Series - Page 144

Chapter 5 Parameters|VFD-B-P Series
Revision April 2009, SW V1.00 5-79
70%
100%
Output
Voltag e
Output Frequency
During auto-energy saving
operation, the output
voltage is lowered as much
as possible while maintaining
the load. Maximum output voltage
is 70% of the normal output voltage.
08 - 16 Automatic Voltage Regulation (AVR)
Factory Setting: 00
Settings 00 AVR function enabled
01 AVR function disabled
02 AVR function disabled for deceleration
 The rated voltage of the motor is usually 440V/400VAC 50Hz/60Hz and the input voltage of
the AC motor drive may vary between 342V to 528 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 V/f curve is set at 400 VAC/50Hz and the input
voltage is at 400V to 528VAC, then the output voltage to motor will be less than 400VAC/50Hz.
If the input power varies between 342V to 400VAC, the output voltage to the motor and the
input voltage will be in direct proportion.
 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.
08 - 17
Software Brake Level
(the Action Level of the Brake Resistor)
Unit: 1
Settings 740 to 860V Factory Setting: 760