Honeywell SmartDrive Compact User Manual page 58

Honeywell
The braking time is defined with parameter 4.7. If high inertia exists, it is rec-
ommended to use an external braking resistor for faster deceleration. See Fig-
ure 9.9.
f out
Par. 4.6
RUN
STOP
Figure 9.9: DC-braking time when Stop mode = Ramp
4.8 F
LUX BRAKE
Instead of DC braking, flux braking is a useful form of braking with motors of
max. 15kW.
When braking is needed, the frequency is reduced and the flux in the motor is
increased, which in turn increases the motor's capability to brake. Unlike DC
braking, the motor speed remains controlled during braking.
Activation mode
0 = Off
1 = On
2 = Chopper
3 = Full mode
Note! Flux braking converts the energy into heat at the motor, and should be
used intermittently to avoid motor damage.
Parameter Descriptions
Motor speed
Output frequency
DC-braking
t = par. 4.7
Description
Not used
Normal mode. Activates flux bracking during
deceleration regardless of load.
Emulates the behavior of a braking chopper by
activating flux bracking based on DC-link voltage.
Minimizes the heating up of the motor in applications
with frequent speed changes.
Activates flux bracking both during deceleration and
on generative shock loads at constant speed. Offers
the highest performance in demanding applications.
57
t
9