Omron MX2 Series - AVR (Automatic Voltage Regulator) Function

7 Other Functions
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Multi-function Compact Inverter 3G3MX2-EV2 User’s Manual (I666-E1)
7-5-11 AVR (Automatic Voltage Regulator) Function
Use this function to have the inverter automatically compensate for the output voltage to the motor even
if the incoming voltage fluctuates.
It is useful as a preventive measure against low output torque to the motor or overexcitation.
Note, however, that the inverter cannot output voltage exceeding the incoming voltage to the inverter.
To enable/disable the AVR (Automatic Voltage Regulator) function, set the 1st/2nd AVR Selection (A081/A281).
• The inverter will output voltage to the motor according to the value set in the 1st/2nd Motor Rated
Voltage Selection (A082/A282).
Note, however, that the inverter cannot output voltage exceeding the incoming voltage to the inverter.
• By default, this parameter is set to 02 (OFF during deceleration) to enable the inverter to output a
large deceleration torque during deceleration.
To avoid possible overcurrent trip during deceleration, set the 1st/2nd AVR Selection (A081/A281) to
00 (Always ON).
Parameter
No.
Function name
Data
Default
data
Unit
A081/A281
1st/2nd AVR Selection
00: Always ON
01: Always OFF
02:
OFF during deceleration
*1
02
−
A082/A282
1st/2nd Motor Rated Volt-
age Selection
200 V: 200 to 240
400 V: 380 to 480
200 or 400
V
*1. This setting decreases the energy to be fed back to the inverter by increasing the motor loss.
It is effective when you need to reduce the deceleration time.
However, to avoid possible overcurrent tripping during deceleration, set the 1st/2nd AVR Selection to 00 (Al-
ways ON).
This function decreases the regenerative energy to be fed back to the inverter by forcing the motor
during deceleration to be in an overexcited state.
It enables you to shorten the deceleration time without use of optional braking resistors.
• To use this function, set the Overvoltage Suppression Function Selection During Deceleration (b130)
to 00 (Disabled).
• Set the 1st/2nd AVR Selection (A081/A281) to 00 (Always ON).
• Setting the AVR Gain at Deceleration (A084) to higher than 100% enables the adjustment of the
motor in an overexcited state.
Set this as a percentage of the 1st/2nd Motor Rated Voltage Selection (A082/A282) value.
• AVR Filter Time Constant (A083) is a parameter to set the filter time constant to adjust the responsiveness
of the AVR (Automatic Voltage Regulator).
Parameter
No.
Function name
Data
Default
data
Unit
b130
Overvoltage Suppression
Function Selection During
Deceleration
00: Disabled
01
−
A081/A281
1st/2nd AVR Selection
00: Always ON
02
−
A082/A282
1st/2nd Motor Rated Volt-
age Selection
200 V: 200 to 240
400 V: 380 to 480
200 or 400
V
A083
AVR Filter Time Constant
0.000 to 10.000
0.300
s
A084
AVR Gain at Deceleration
50. to 200.
100.
%
AVR (Automatic Voltage Regulator) Function Settings
Overexcitation Control during Deceleration