26 Motor Control - ABB ACS150 series User Manual

Parameters in the Long parameter mode
Index Name/Selection

26 MOTOR CONTROL

2601 FLUX OPT ENABLE
0 = OFF
1 = ON
2603 IR COMP VOLT
0.0...100.0 V
2604 IR COMP FREQ
0...100%
2605 U/F RATIO
1 = LINEAR
2 = SQUARED
2606 SWITCHING FREQ
4 kHz
8 kHz
12 kHz
16 kHz
Description
Motor control variables
Activates/deactivates the Flux optimisation function. Flux optimisation
reduces the total energy consumption and motor noise level when the drive
operates below the nominal load. The total efficiency (motor and the drive)
can be improved by 1% to 10%, depending on the load torque and speed.
The disadvantage of this function is that the dynamic performance of the
drive is weakened.
Inactive
Active
Defines the output voltage boost at zero speed (IR compensation). The
function is useful in applications with a high break-away torque. To prevent
overheating, set IR compensation voltage as low as possible.
The figure below illustrates the IR compensation.
Motor
voltage
A
2603
B
2604
Voltage boost
Defines the frequency at which the IR compensation is 0 V. See the figure for
parameter 2603 IR COMP VOLT.
Value in percent of the motor frequency
Selects the voltage to frequency (U/f) ratio below the field weakening point.
Linear ratio for constant torque applications
Squared ratio for centrifugal pump and fan applications. With squared U/f
ratio the noise level is lower for most operating frequencies.
Defines the switching frequency of the drive. Higher switching frequency
results in lower acoustic noise. See also parameter
CTRL and section Switching frequency derating, I2N
In multimotor systems, do not change the switching frequency from the
default value.
4 kHz
8 kHz
12 kHz
16 kHz
A = IR compensated
B = No compensation
Typical IR compensation values:
P (kW) 0.37 0.75 2.2 4.0
N
200...240 V units
IR comp (V) 8.4 7.7 5.6 8.4
380...480 V units
f (Hz)
IR comp (V) 14
2607
on page 139.
Actual signals and parameters
Def
0 = OFF
Type
dependent
14 5.6 8.4
80%
1 = LINEAR
4 kHz
SWITCH FREQ
105