ABB ACS350 User Manual page 193

Parameters – complete descriptions
Index Name/Selection
OFF
ON
2602 FLUX BRAKING
OFF
ON
2603 IR COMP VOLT
0.0...100.0 V
2604 IR COMP FREQ
0...100%
2605 U/F RATIO
LINEAR
SQUARED
USER DEFINED
2606 SWITCHING FREQ
4 kHz
8 kHz
12 kHz
16 kHz
Description
Inactive
Active
Activates/deactivates the Flux Braking function. See section
page 108.
Inactive
Active
Defines the output voltage boost at zero speed (IR compensation). The
function is useful in applications with high break-away torque when vector
control cannot be applied.
To prevent overheating, set IR compensation voltage as low as possible.
The figure below illustrates the IR compensation.
Note: The function can be used only when parameter
MODE setting is SCALAR:FREQ.
Motor
voltage
A
2603
B
2604
Voltage boost
Defines the frequency at which the IR compensation is 0 V. See figure in
parameter 2603 IR COMP VOLT.
Note: If parameter 2605 U/F RATIO Is set to USER DEFINED, this
parameter is not active. The IR compensation frequency is set by parameter
2610 USER DEFINED U1.
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.
Custom ratio defined by parameters 2610...2618. See section
ratio on page112.
Defines the switching frequency of the drive. Higher switching frequency
results in lower acoustic noise. See also parameter
CTRL and Switching frequency derating
Can be used with scalar and vector control. The control mode is selected by
parameter 9904 MOTOR CTRL MODE.
Can be used with scalar and vector control. The control mode is selected by
parameter 9904 MOTOR CTRL MODE.
Can be used with scalar and vector control. The control mode is selected by
parameter 9904 MOTOR CTRL MODE.
Can be used only with scalar control (i.e. when parameter
CTRL MODE setting is SCALAR:FREQ).
9904
A = IR compensated
B = No compensation
Typical IR compensation values:
P (kW) 0.37 0.75 2.2 4.0 7.5
N
200...240 V units
IR comp (V) 8.4 7.7 5.6 8.4 N/A
380...480 V units
f (Hz)
IR comp (V) 14
2607 SWITC FREQ
on page 291.
Actual signals and parameters
Def, FbEq
0
1
Flux Braking on OFF
0
1
Type
dependent
MOTOR CTRL
14 5.6 8.4 7
1 = 0.1 V
80
1 = 1%
LINEAR
1
2
Custom U/f 3
4
1 = 1 kHz
9904 MOTOR
193