Download 9000X AF Drives

9000X AF Drives
August 2010
Description of Parameters
507
DC-braking current
234567
(P1.4.8)
Defines the current injected into the motor during DC-braking.
508
DC-braking time at stop
234567
(P1.4.9)
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, ID506.
0.0
DC-brake is not used
>0.0
DC-brake is in use and its function depends on the Stop function, (ID506).
The DC-braking time is determined with this parameter.
Par. ID506 = 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
ID508 determines the braking time. When the frequency is ≤10% of the nominal, the
braking time is 10% of the set value of ID508.
fout
fout
fn
fn
Output Frequency
Motor Speed
Output Frequency
0.1 x fn
DC-Braking ON
DC-Braking ON
t
t
t = 0.1 x ID508
t = 1 x ID508
RUN
STOP
Motor Speed
RUN
STOP
Figure 8-43: DC-Braking Time when Stop Mode = Coasting
MN04004001E
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