ABB ACS350 Series, User Manual

Page: 193 / 314

Actual signals and parameters
193
OFF Inactive 0
ON Active 1
2602 FLUX BRAKING Activates/deactivates the Flux Braking function. See section Flux Braking on
page 108 .
OFF
OFF Inactive 0
ON Active 1
2603 IR COMP VOLT 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 9904 MOTOR CTRL
MODE setting is SCALAR:FREQ.
Type
dependent
0.0…100.0 V Voltage boost 1 = 0.1 V
2604 IR COMP FREQ 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.
80
0...100% Value in percent of the motor frequency 1 = 1%
2605 U/F RATIO Selects the voltage to frequency (U/f) ratio below the field weakening point. LINEAR
LINEAR Linear ratio for constant torque applications. 1
SQUARED Squared ratio for centrifugal pump and fan applications. With squared U/f
ratio the noise level is lower for most operating frequencies. 2
USER DEFINED Custom ratio defined by parameters 2610 ... 2618 . See section Custom U/f
ratio on page 112 .
3
2606 SWITCHING FREQ Defines the switching frequency of the drive. Higher switching frequency
results in lower acoustic noise. See also parameter
2607 SWITC FREQ
CTRL and Switching frequency derating on page 291 .
4
4 kHz Can be used with scalar and vector control. The control mode is selected by
parameter
9904 MOTOR CTRL MODE.
1 = 1 kHz
8 kHz Can be used with scalar and vector control. The control mode is selected by
parameter
9904 MOTOR CTRL MODE.
12 kHz Can be used with scalar and vector control. The control mode is selected by
parameter
9904 MOTOR CTRL MODE.
16 kHz Can be used only with scalar control (i.e. when parameter 9904 MOTOR
CTRL MODE setting is SCALAR:FREQ).
Parameters – complete descriptions
Index Name/Selection Description Def, FbEq
Motor
f (Hz)
A
B
voltage
A = IR compensated
B = No compensation
2603
2604
Typical IR compensation values:
P
N
(kW) 0.37 0.75 2.2 4.0 7.5
200…240 V units
IR comp (V) 8.4 7.7 5.6 8.4 N/A
380…480 V units
IR comp (V) 14 14 5.6 8.4 7