Hitachi SJ Series User Manual page 162

Chapter 12
Automatic voltage regulation function (AVR
function)
Ａ
• The inverter automatically operates the automatic
voltage regulation function (AVR function). This
function outputs voltage to the motor correctly even
with variation in the input voltage to the inverter.
• Output of a voltage larger than the input voltage is
not allowed even using this function.
Output
voltage
Motor
Rated
voltage
Ａ
• To use operation with conventional AVR function
being set OFF, make the setting in [bA146]
over-excitation function selection.
• [bA146]=02 for AVR OFF during deceleration.
• [bA146]=01 for AVR OFF all time.
Input voltage
Output voltage by AVR
function
Time (s)
Relation between frequency and voltage under
general V/f control (IM)
Ａ
• General V/f control command is given in the
following with the base frequency and rated
voltage being set.
• At the frequency in the range from the base to max.
frequency, the output voltage reaches a max. of the
rated voltage of motor.
Output
voltage
Motor
Rated
voltage (Ex.)
200V
Control of general synchronous motor
！
• Basically the synchronous motor needs current
calculation control and the motor parameters need
to be set. The parameters in this item and motor
constants in the next item need to be set.
12-3-3
Inverter Functions
Command
Max.
Base frequency (Hz)
frequency
frequency