ABB ACS355 User Manual page 233

All parameters
No. Name/Value
2603 IR COMP
VOLT
0.0...100.0 V
2604 IR COMP
FREQ
0...100%
2605 U/F RATIO
LINEAR
SQUARED
USER
DEFINED
Description
Defines the output voltage boost at zero speed (IR
compensation). The function is useful in applications with a
high break-away torque when vector control cannot be
applied.
To prevent overheating, set IR compensation voltage as low
as possible.
Note: The function can be used only when parameter
MOTOR CTRL MODE
The figure below illustrates the IR compensation.
Typical IR compensation values:
P (kW)
N
200...240 V units
IR comp (V)
380...480 V units
IR comp (V)
Motor
voltage
A
2603
B
2604
Voltage boost
Defines the frequency at which the IR compensation is 0 V.
See the figure for parameter
Note: If parameter 2605 U/F RATIO
DEFINED, this parameter is not active. The IR
compensation frequency is set by parameter
DEFINED U1.
Value in percent of the motor frequency
Selects the voltage to frequency (U/f) ratio below the field
weakening point. For scalar control only.
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. Not recommended for permanent
magnet motors.
Custom ratio defined by parameters 2610...2618. See
section Custom U/f ratio
Actual signals and parameters 233
setting is SCALAR:
0.37 0.75 2.2 4.0 7.5
8.4 7.7 5.6 8.4 N/A
14 14 5.6 8.4 7
A = IR compensated
B = No compensation
f (Hz)
2603 IR COMP VOLT
is set to
on page 141.
Def/FbEq
Type
dependent
9904
FREQ.
1 = 0.1 V
80%
USER
2610 USER
1 = 1%
LINEAR
1
2
3