Honeywell NXL Series Applications Manual page 34

Page 34 (68)
2.4.4 DC-braking time at stop
Determines if braking is ON or OFF and the braking time of the DC-brake when the motor is
stopping. The function of the DC-brake depends on the stop function, parameter 2.1.9.
0
>0
Par. 2.1.9 = 0 (Stop function = Coasting):
After the stop command, the motor coasts to a stop without control from the frequency
converter.
With the DC injection, the motor can be electrically stopped in the shortest possible time,
without using an optional external braking resistor.
The braking time is scaled by the frequency when the DC-braking starts. If the frequency is
greater than the nominal frequency of the motor, the set value of parameter 2.4.4 determines
the braking time. When the frequency is ≤10% of the nominal, the braking time is 10% of the
set value of parameter 2.4.4.
Figure 1- 11. DC-braking time when Stop mode = Coasting.
4
Description of parameters
DC-brake is not used
DC-brake is in use and its function depends on the Stop function,
(par. 2.1.9). The DC-braking time is determined with this parameter
f out
f n
Output frequency
Motor speed
DC-braking ON
t = 1 x Par. 2.4.4
RUN
STOP
f out
f n
Output frequency
Motor speed
0,1 x f n
DC-braking ON
t
t = 0,1 x Par. 2.4.4
RUN
STOP
Honeywell
t
NX12K21