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Setting Parameters
01/02 AWB8230-1415GB
146
Automatic voltage regulation (AVR)
The AVR function stabilizes the motor voltage if there are fluctua-
tions on the DC bus voltage. These deviations result from, for
example
• unstable mains supplies or
• DC bus voltage dips or peaks caused by short acceleration and
deceleration times.
A stable motor voltage provides a high level of torque, particularly
during acceleration.
Regenerative motor operation (without AVR function) results in a
rise in the DC bus voltage in the deceleration phase (particularly
with very short deceleration times), which also leads to a corres-
ponding rise in the motor voltage. The increase in the motor
voltage causes an increase in the braking torque. Under
PNU A081, you can therefore deactivate the AVR function for
deceleration.
If the mains voltage is higher than the rated motor voltage, enter
the mains voltage under PNU A082 and reduce the output voltage
under PNU A045 to the rated motor voltage.
Example: At 440 V mains voltage and 400 V rated motor voltage,
enter, under PNU A082 the value 440 and, under PNU A045, the
value 91 % (= 400/440
x
100 %).
PNU
Name
Adjustable in RUN mode
Value
Function
WE
Normal
Extended
A081
Characteristic
of the AVR
function
–
–
00
AVR function active during entire operation.
02
01
AVR function is not active.
02
AVR function active during operation except for deceleration
A082
Motor voltage
for AVR func-
tion
–
–
380, 400, 415,
440, 460, 480
400 V series: 380, 400, 415, 440, 460, 480 V
400
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