Moeller DF51 - Automatic Voltage Regulation (AVR)

10/05 AWB8230-1541GB
Motor control
67
The RUN signal is activated with the value set in PNU b082. It
remains active as long as a frequency of or above this value is
applied.
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 at
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 (a page 68).
PNU Name RUN b031
= 10
Value Function DS
b082 Increased
starting
frequency
(e.g. with high
level of friction)
– j 0.5 – 9.9 Hz A higher starting frequency results in shorter acceleration and
deceleration times (for example to overcome high frictional resistance).
Up to the set starting frequency, the motor accelerates without a ramp
function. If the frequencies are too high, fault message E002 may be
issued.
0.5
PNU Name RUN b031
= 10
Value Function DS
A081 Output voltage
(AVR function)
– – 00 AVR enabled 00
01 AVR disabled
02 AVR disabled during deceleration
A082 Output voltage
(AVR motor
rated voltage)
– – 200, 215, 220,
230, 240, 380,
400, 415, 440,
460, 480
• 200 V range:DF51-32…-…: 200, 215, 220, 230, 240
• 400 V range: DF51-340-…: 380, 400, 415, 440, 460, 480
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