09/01 AWB8230-1412GB
Automatic voltage regulation
(AVR)
95
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. For this reason,
you can deactivate the AVR function for deceleration under
PNU A81.
If the mains voltage is higher than the rated motor voltage, enter
the mains voltage under PNU A82 and reduce the output voltage
in PNU A45 to the rated motor voltage.
Example: With 440 V mains voltage and 400 V rated motor
voltage, enter 440 under PNU A82 and 91 %
(= 400/440 x 100 %) under PNU A45.
PNU Name Adjustable in
RUN mode
Value Function WE
A81 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
A82 Motor voltage for AVR
function
– 200, 220, 230,
240, 380, 400,
415, 440, 460
The settings depend on the device series used:
• 200 V series: 200, 220, 230, 240 V
• 400 V series: 380, 400, 415, 440, 460 V
230/
400
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