Setting Parameters
01/02 AWB8230-1413GB
128
Automatic voltage regulation (AVR)
The AVR function stabilizes the motor voltage if there are
fluctuations 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
corresponding rise in the motor voltage. The increase in the motor
voltage causes an increase in the braking torque. For deceleration,
you can therefore deactivate the AVR function under PNU A081.
If the mains voltage is higher than the rated motor voltage, enter
the mains voltage under PNU A082 and, under PNU A045 reduce
the output voltage to the rated motor voltage.
Example: At 440 V mains voltage and 400 V rated motor voltage,
enter 440 under PNU A082 and 91 % (= 400/440
x
100 %)
under PNU A045.
Energy-saving mode
Energy-saving mode is intended especially for pump and fan
applications with reduced torque characteristics. In this mode, the
output voltage is automatically adapted to the motor load, thereby
drawing no more energy from the mains than required for
operation.
When you enter the value 01 under PNU A085, you can adapt the
response time of the energy-saving mode under PNU A086. A
short response time achieves more accurate, and a long response
time less accurate voltage matching.
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
function
–
–
380, 400, 415,
440, 460, 480
Voltage threshold for activation the AVR function
400
PNU
Name
Adjustable in RUN mode
Value
Function
WE
Normal
Extended
A085
Energy-saving
mode
–
–
00
Energy-saving mode not active
00
01
Energy-saving mode active
A086
Response time
j
j
0 to 100 s
Response time for voltage matching
50.0
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