Chapter 5 Function parameter
80
Ch
ap
ter 5
frequency, the inverter will stop output for some time, and then start DC braking process. At high
speed to prevent the start of DC braking can cause the overcurrent fault.
Stop braking current: DC braking means the output current, the percentage relative to motor
nominal current. This value is larger the DC brake effect is stronger, but the greater the heat the
motor and the inverter.
Stop braking time: DC braking time kept. This value is 0 DC braking process is canceled. DC
injection braking process, see the diagram shown.
Time (
t)
Effective value of
output voltage
Stop DC braking time(t2)
Waiting time of stop DC braking(t1)
Stop DC braking
amount
Output
frequency
（Hz）
Initial frequency of stop
DC braking
Running command
Time (
t)
Diagram 5-9:Schematic diagram of stop DC braking time
F3.12 Braking utilization rate
0%~100%
100%
☆
F3.13 Ac/deceleration mode
Linear acceleration and deceleration
0
0
★
S curve acceleration and deceleration A
1
S curve acceleration and deceleration B
2
Select the frequency change mode in the process of start/stop.
0: Linear acceleration and deceleration
The output frequency increases or decreases linearly. PI500 provides four kinds of
acceleration and deceleration time. You can select by the multi-function digital input terminals
(F1.00 to F1.08).
1: S curve acceleration and deceleration A
The output frequency increases or decreases at the S curve. S-curve is used for the occasion
that requires to gently start or stop, such as elevators, conveyor belts, etc..The function code F3.14
and F3.15 respectively defined the proportion of S curve start-section and the proportion of S
curve end-section
2: S curve acceleration and deceleration B
In the mode of S curve acceleration and deceleration B, the motor rated frequency fb is
always the inflection point of S curve. Usually used for the occasion of high-speed regional above
the rated frequency that requires rapid acceleration and deceleration.
When the frequency is higher than the rated frequency,the acceleration and deceleration are:
t=
(
4
9
f
f
b
)
2
+
T
4
9
And ,‟f‟ means the setting frequency, „fb‟means the rated frequency .‟T‟ means the time
from 0 to rated frequency (fb).
F3.14 Proportion of S curve start-section
0.0%~(100.0%~F3.15)
30.0%
★
F3.15 Proportion of S curve end-section
0.0%~(100.0%~F3.14)
30.0%
★
