apfiff09 marine
VACON®
•
183
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P2.7.1.3
DC-braking time at stop ID508
“Stop D
-
BrakeTm”
Defines the time to use DC brake at stop. The operation is different depending on the
selected stop mode (coasting or ramping).
Stop function = 0 / Coasting:
After the stop command, the motor coasts to a stop without control of the drive.
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 at the moment of stop command. If
the frequency is the nominal frequency of the motor or higher, the set value of DC
braking time at stop is used as the braking time. When the frequency is below the
nominal frequency, the relation between the nominal frequency and the output frequency
at the time of stop command will determine the DC braking time. For example, 50-hertz
motor is running at 25 Hz when the stop command is given. The DC brake time will be
50% of the DC braking time at stop. If the frequency is below 5 Hz, the minimum DC
braking time is 10% of the DC braking time at stop.
DC braking is started after a short restart delay following the stop command if stop
function is coasting.
fn
0 %
50 %
Restart
delay
Output frequency
DC-Brake
time at
stop
fn
0 %
50 %
Restart
delay
Output frequency
DC-Brake
time at stop
100 %
DC-Brake
time at stop
50 %
Figure 7-14. DC-braking time when Stop mode = Coasting, from nominal speed and 50 % of
nominal speed.
Stop function = Ramp:
After the Stop command, the speed of the motor is reduced according to the set
deceleration parameters, to the speed defined with parameter DC braking frequency at
stop, where the DC braking starts.
The braking time is defined with parameter
DC braking time at stop
. If high inertia exists,
it is recommended to use an external braking resistor for faster deceleration. See Figure
7-15.
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