Vacon 20 CP/X Applications Manual page 59

Parameter description
Note: optimized U/f settings will cause motor current values comparable to nominal one, also
at very low speed. External cooling of the motor is needed if the motor works in this condition
for significant time.
P8.17 O
VERVOLTAGE CONTROLLER
Overvoltage regulator automatically increases deceleration ramp time if the internal DC link
voltage is too high.
0: enabled
1: disabled
P8.18 U
NDERVOLTAGE CONTROLLER
Undervoltage regulator automatically decelerates the motor if the internal DC link voltage is
too low.
0: enabled
1: disabled
P8.19 S
WITCHING FREQUENCY CONTROLLER
Switching frequency regulator automatically decreases the PWM frequency if the unit temper-
ature is too high.
0: enabled
1: disabled
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