Hitachi WJ C1 Series User Manual

Chapter 9 Inverter Functions
9-9-6
9.9.4 Suppressing Overvoltage by Controlling Output Voltage
 How to avoid overvoltage errors that occur when the motor is decelerated?
 How to increase the output voltage according to the regenerative power during deceleration
and decelerate the motor while avoiding the overvoltage error?
 When the control method is V/f control, output voltage can be controlled by the AVR function
using "AVR function selection [A081]
*1*2
".
 Overexcitation of the motor during deceleration reduces regenerative energy to the inverter,
making it less likely to cause overvoltage error.
 Even when "Always enable (00)" is set, voltage exceeding the input voltage cannot be output.
 When the AVR function is turned off, the motor may generate more heat due to an increase in
output current caused by an increase in output voltage or due to overexcitation of the motor.
 Overvoltage trips may occur depending on the deceleration rate or load conditions.
Code
Item
Description
Data
[A081]
*1
AVR function selection
Always enable
00
Always disable
01
Disable during deceleration:
The motor become
overexcitation state only
during deceleration.
02
[A082]
*1
Motor rated voltage
Sets the rated voltage of the
motor.
200 V class:
200/215/220/230/240
400 V class:
380/400/415/440/460/480
[A083]
AVR function output
filter time constant
Filter time constant for the
output voltage at overexcitation
state.
0.000 to 10.000 (s)
[A084]
AVR function voltage
gain during
deceleration
Gain for the output voltage at
overexcitation state.
50 to 200 (%)
*1. "2nd-motor control [SET]" target parameter. The second control parameter is also subject to setting.
Q
A
!

Hitachi WJ C1 Series Specifications

General

Brand	Hitachi
Model	WJ C1 Series
Category	Inverter
Language	English