ABB ACH550-VCR - Page 129

ACH550-UH User’s Manual 1-125
Parameters
Group 26: MOTOR CONTROL
This group defines variables used for motor control.
Group 26: Motor Control
Code Description Range Resolution Default S
2601 FLUX OPT ENABLE 0, 1 1 1 (ON)
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 0, 1 1 0 (
OFF)
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 0.0…100.0 V 0.1 V 0.0 V
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 0…100% 1% 80%
Sets the frequency at which IR compensation is 0 V (in % of motor frequency).
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)