Eaton SV9000 - Page 35

Page 30 (60) Motor Pump Enhanced Protection Application SV9000
f
n
Run
Stop
t = 1 × Par. 4.9
t
DC braking On
Motor speed
Output frequency
f
n
Run
Stop
Motor speed
Output frequency
DC braking On
t
t = 0.1 × Par. 4.9
f
out
(Hz) f
out
(Hz)
Figure 6.2-14: DC-Braking Time when Stop = Coasting
Stop-function = 1 (ramp):
After the Stop command, the speed of the motor is reduced according to the set
deceleration parameters, as fast as possible, to a speed defined with the parameter
4. 10, where the DC-braking starts.
The braking time is defined with parameter 4.9.
If a high inertia exists, it is recommended to use an external braking resistor for faster
deceleration. See figure 6.2-15.
4.10 Execute frequency of DC- brake during ramp Stop
See figure 6.2-15.
Run
Stop
Par. 4.10
Motor speed
Output frequency
DC braking On
t = Par. 4.9
t
f
out
(Hz)
Figure 6.2-15: DC-Braking Time when Stop Function = Ramp
4.11 DC-brake time at Start
0 DC-brake is not used
>0 DC-brake is active when the start command is given and this parameter defines the
time before the brake is released. After the brake is released, the output frequency
increases according to the set start function parameter 4.6 and acceleration
parameters (1.3, 4.1 or 4.2, 4.3), see figure 6.2-16.