Firmware Manual

Appendix A—Description of Parameters
PowerXL DG1 Series Adjustable Frequency Drives MN040004EN—March 2014 www.eaton.com 177
P14.4 255 Stop DC-Brake Time 1, 2, 3, 4 RW
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,
P7.10.
>0.0 DC-brake is not used
>0.0 DC-brake is in use and its function depends on the Stop function, (P7.10). The
DC-braking time is determined with this parameter
Par. P7.10 = 0; Stop function = Coasting:
After the stop command, the motor coasts to a stop without control of the frequency
converter.
With 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 according to the frequency when the DC-braking starts. If
the frequency is ≥ the nominal frequency of the motor, the set value of parameter
P14.4 determines the braking time. When the frequency is ≤10% of the nominal, the
braking time is 10% of the set value of P14.4.
Figure 66. DC-Braking Time when Stop Mode = Coasting
Par. P7.10 = 1; Stop function = Ramp:
After the Stop command, the speed of the motor is reduced according to the set
deceleration parameters, as fast as possible, to the speed defined with P14.3, where
the DC-braking starts.
The braking time is defined with P14.4. If high inertia exists, it is recommended to
use an external braking resistor for faster deceleration. See Figure 67.
Figure 67. DC-Braking Time when Stop Mode = Ramp
Code Modbus ID Parameter Application
RO/RW
t
f
out
Output Frequency
Motor Speed
DC-Braking ON
RUN
STOP
t = 1 x P14.4
t
f
out
f
n
f
n
Output Frequency
Motor Speed
DC-Braking ON
RUN
STOP
t = 0.1 x P14.4
0.1 x f
n
t
Output Frequency
Motor Speed
DC-Braking
RUN
STOP
P14.3
t = P14.4
f
out