Honeywell SmartVFD HVAC2 Applications Manual page 148

Stop DC current time
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, par. 2.3.
0 =
DC brake is not active
>0 =
DC brake is active and its function
depends on the Stop function,
(par. 2.3). The DC braking time is deter-
mined with this parameter.
Par. 2.3 = 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,
or equal to the nominal frequency of the motor,
the set value of parameter 4.10 determines the
braking time. When the frequency is 10% of the
nominal, the braking time is 10% of the set value
of parameter 4.10.
f out
f n
Output frequency
Motor speed
DC-braking ON
t = 1 x par. 4.10
RUN
STOP
Fig. 53. DC-braking time when Stop mode =
Par. 2.3 = 1 (Stop function = Ramp):
After the Stop command, the speed of the motor
is reduced according to the set deceleration
parameters, if the inertia of the motor and load
allows that, to the speed defined with parameter
4.11, where the DC-braking starts.
The braking time is defined with parameter 4.10.
See Figure 54"" on page 149.
148
f out
f n
Output frequency
Motor speed
0,1 x f n
DC-braking ON
t
t = 0,1 x par. 4.10
RUN
STOP
Coasting
t
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