P3.1.3.5 GENERATOR POWER LIMIT (ID 1290)
Use this parameter to set the maximum power limit of the generating side.
The range of values for the parameter is different for each enclosure size of the drive.
10.2.4
OPEN LOOP PARAMETERS
P3.1.4.1 U/F RATIO (ID 108)
Use this parameter to set the type of the U/f curve between zero frequency and the field
weakening point.
Selection
number
Selection name
Description
0
Linear
The voltage of the motor changes linearly as a function of the
output frequency. The voltage changes from the value of
P3.1.4.6 (Zero Frequency Voltage) to the value of P3.1.4.3
(Voltage at Field Weakening Point) at a frequency set in
P3.1.4.2 (Field Weakening Point Frequency). Use this default
setting if a different setting is not necessary.
1
Squared
The voltage of the motor changes from the value of P3.1.4.6
(Zero Frequency Voltage) to the value of P3.1.4.2 (Field
Weakening Point Frequency) at a squared curve. The motor
operates undermagnetised below the field weakening point
and produces less torque. You can use the squared U/f ratio
in applications where the torque demand is in relation to the
square of the speed, for example in centrifugal fans and
pumps.
2
Programmable
It is possible to program the U/f curve with 3 different points:
the zero frequency voltage (P1), the midpoint voltage/
frequency (P2), and the field weakening point (P3). You can
use the programmable U/f curve at low frequencies if it is
necessary to have more torque. You can find the optimal set-
tings automatically with an identification run (P3.1.2.4).
PARAMETER DESCRIPTIONS
VACON · 205
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