Hitachi WJ200 Series

3−35
Automatic Voltage Regulation (AVR) Function
The automatic voltage regulation (AVR) feature keeps the inverter output waveform at
a relatively constant amplitude during power input fluctuations. This can be useful if
the installation is subject to input voltage fluctuations. However, the inverter cannot
boost its motor output to a voltage higher than the power input voltage. If you enable
this feature, be sure to select the proper voltage class setting for your motor.
“A” Function
Run
Mode
Edit
Defaults
Func.
Code
Name Description Lnitial data Units
A081
AVR function select Automatic (output) voltage
regulation, selects from three
type of AVR functions, three
option codes:
00…AVR enabled
01…AVR disabled
02…AVR enabled except
during deceleration
U
02
−
a281
AVR function select,
2
nd
motor
U
02
−
A082
AVR voltage select 200V class inverter settings:
……200/215/220/230/240
400V class inverter settings:
……380/400/415/440/460/480
U
200/
400
V
a282
AVR voltage select,
2
nd
motor
U
200/
400
V
a083
AVR filter time constant Define the time constant of the
AVR filter, range is 0 to 10 sec.
U
0.300 sec
a084
AVR deceleration gain Gain adjustment of the
braking performance, range is
50 to 200%
U
100. %
Note: The motor behave as generator during deceleration and the energy is regenerated to
the drive. As a result, the DC voltage in the inverter increases and cause over-voltage
trip when exceeding the OV level. When the voltage is set high, deceleration time can
be set shorter thanks to the energy consumption due to the incensement of loss in
inverter. In order to set deceleration time shorter without over-voltage trip, please try
to set AVR off during deceleration or to tune the AR filter time constant and AVR
deceleration gain.