Moeller Rapid Link, Switching And Installation System, Page: 128 / 162

Speed controller RA-SP
01/08 AWB2190-1430GB
124
F-03 Automatic voltage regulation (AVR)
The AVR function stabilizes the motor voltage if there are
fluctuations on the DC bus voltage. These fluctuations are caused,
for example, by:
• 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 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 (V gain in Monitor menu) to the rated motor voltage.
Example: With 440 V mains voltage and 400 V rated motor
voltage, enter 82 under PNU A440 and 91 % (= 400/
440
x
100 %) under PNU A45.
PNU Designation Adjustable in
RUN mode Value Function FS
A81 Characteristic of the
AVR function – 00 = ON AVR function active during entire operation. 02
01 = OFF AVR function is not active.
02 = DOFF AVR function active during operation except for deceleration
A82 Motor voltage for AVR
function – 380, 400, 415,
440, 460 The settings depend on the device series used:
• 400 V series: 380, 400, 415, 440, 460 V
Caution! Other settings are not permissible. 400