ABB ACS150 User Manual page 87

Index Name/Selection
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
2607 SWITCH FREQ CTRL Activates the switching frequency control. When active, the selection of
0 = OFF
1 = ON
Description
Defines the output voltage boost at zero speed (IR compensation). The
function is useful in applications with 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 Switching frequency derating
4 kHz
8 kHz
12 kHz
parameter 2606 SWITCHING FREQ is limited when the drive internal
temperature increases. See the figure below. This function allows the highest
possible switching frequency at a specific operation point.
Higher switching frequency results in lower acoustic noise, but higher internal
losses.
f
sw
limit
12 kHz
8 kHz
4 kHz
100°C
Inactive
Active
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 SWITCH FREQ
on page 110.
Drive
temperature
110°C 120°C
Actual signals and parameters
Type
dependent
14 5.6 8.4
80
1 = LINEAR
4
1 = ON
T
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