Program features
67
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.
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
.
Flux braking
No Flux braking
t
(s)
Motor
Flux braking
No Flux braking
f
(Hz)
T
Br
T
N
20
40
60
(%)
T
N
= 100 Nm
T
Br
= Braking Torque
Speed
50 HZ / 60 Hz
120
80
40
0
5
10
20
30
40
50
1
2
3
4
5
120
80
40
0
5
10
20
30
40
50
1
2
3
4
5
f
(Hz)
Braking Torque (%)
f
(Hz)
Flux braking
No Flux braking
1
2
3
4
5
2.2 kW
15 kW
37 kW
75 kW
250 kW
Rated Motor Power
Содержание ACS 800 Series
Страница 1: ...ACS800 Firmware Manual Crane Control Program N697 ...
Страница 4: ......
Страница 26: ...Start up and control through the I O interface 26 ...
Страница 36: ...Quick start up guide 36 ...
Страница 52: ...Control panel 52 ...
Страница 105: ...Program features 105 Figure Control diagram for Shaft synchronisation executed in 20 ms ...
Страница 126: ...Program features 126 The figures below show speed limits according to different load conditions ...
Страница 128: ...Program features 128 ...
Страница 150: ...Application macros control location EXT1 EXT2 150 ...
Страница 228: ...Actual signals and parameters 228 ...
Страница 299: ...Adaptive Programming examples for crane control 299 ...
Страница 305: ...Adaptive Programming examples for crane control 305 ...
Страница 312: ...Adaptive Programming examples for crane control 312 The following figures show the previous example enlarged ...
Страница 314: ...Adaptive Programming examples for crane control 314 The following figures show the previous example enlarged ...
Страница 318: ...Analogue Extension Module 318 ...
Страница 332: ...Additional data actual signals and parameters 332 ...
Страница 333: ...DriveWindow 333 DriveWindow DriveWindow connected to the ACS800 RMIO RDCO board and channel CH3 ...
Страница 334: ...DriveWindow 334 ...
Страница 335: ...Control block diagrams 335 Control block diagrams ...
Страница 336: ...Control block diagrams 336 ...
Страница 337: ...Control block diagrams 337 ...
Страница 338: ...Control block diagrams 338 ...
Страница 340: ...www abb com drives www abb com drivespartners Contact us 3AFE68775230 Rev E EN 2012 09 25 ...