Flux Braking; Settings - ABB ACS800 Firmware Manual

Flux braking

The drive can provide greater deceleration by raising the level of magnetisation in
the motor. By increasing the motor flux, the energy generated by the motor during
braking can be converted to motor thermal energy. This feature is useful in motor
power ranges below 15 kW.
Motor
Speed
Rated Motor Power
1
2
3
4
5
The drive monitors the motor status continuously, also during the Flux braking.
Therefore, Flux braking can be used both for stopping the motor and for changing
the speed. The other benefits of Flux braking are:
• The braking starts immediately after a stop command is given. The function does
not need to wait for the flux reduction before it can start the braking.
• The cooling of the motor is efficient. The stator current of the motor increases
during the Flux braking, not the rotor current. The stator cools much more
efficiently than the rotor.

Settings

Parameter 26.02.
No Flux braking
Flux braking
Braking Torque (%)
120
80
40
2.2 kW
15 kW
0
37 kW
75 kW 120
250 kW
80
40
0
T
Br
(%)
T
N
60
40
Flux braking
20
No Flux braking
t (s)
No Flux braking
1
2
3
4
5
5 10 20
Flux braking
1
2
3
4
5
5 10 20
T = Braking Torque
Br
T = 100 Nm
N
f (Hz)
50 HZ / 60 Hz
f (Hz)
30 40 50
f (Hz)
30 40 50
Program features
67