ACS550-02/U2 User’s Manual 167
Parameters
Group 26: MOTOR CONTROL
This group defines variables used for motor control.
Code Description
2601 FLUX OPT ENABLE
Changes the magnitude of the flux depending on the actual load. Flux Optimization can reduce the total energy
consumption and noise, and it should be enabled for drives that usually operate below nominal load.
0 = OFF – Disables the feature.
1 =
ON – Enables the feature.
2602 FLUX BRAKING
Provides faster deceleration by raising the level of
magnetization in the motor when needed, instead of
limiting the deceleration ramp. By increasing the flux in
the motor, the energy of the mechanical system is
changed to thermal energy in the motor.
• Requires parameter 9904
MOTOR CTRL MODE =
1(VECTOR:sPEED) OR 2(VECTOR:TORQ).
0 =
OFF – Disables the feature.
1 =
ON – Enables the feature.
2603 IR COMP VOLT
Sets the IR compensation voltage used for 0 Hz.
• Requires parameter 9904
MOTOR CTRL MODE =
3(SCALAR:FREQ).
• Keep IR compensation as low as possible to prevent
overheating.
• Typical IR compensation values are:
IR compensation
• When enabled, IR compensation provides an extra
voltage boost to the motor at low speeds. Use IR
compensation, for example, in applications that require a
high breakaway torque.
2604 IR COMP FREQ
Sets the frequency at which IR compensation is 0 V (in
% of motor frequency).
2605 U/F RATIO
Selects the form for the U/f (voltage to frequency) ratio below field weakening point.
1 =
LINEAR – Preferred for constant torque applications.
2 = SQUARED – Preferred for centrifugal pump and fan applications. (SQUARED is more silent for most operating
frequencies.)
2606 SWITCHING FREQ
Sets the switching frequency for the drive. Also see parameter 2607
SWITCH FREQ CTRL.
• Higher switching frequencies mean less noise.
• Available switching frequencies 1 and 4 kHz.
120%
80
40
0
Without flux braking
50
With flux braking
510203040
120%
80
40
0
50510203040
1
2
3
4
5
1
2
3
4
5
1
2
3
4
5
2.2 kW
15 kW
37 kW
75 kW
250 kW
Rated motor power
Braking
torque (%)
f (Hz)
f (Hz)
380…480 V drives
P
N
(kW) 3 7.5 15 37 132
IR comp (V) 18 15 12 8 3
Motor
A
B
voltage
A = IR compensated
B = No compensation
P 2603
P 2604
f (Hz)
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