7
5
Parameter Description
Parameter Description
There is a built-in transistor (a.k.a. brake transistor) in the inverter. The conducting time ratio of the
transistor is referred to as the regenerative brake duty. The higher the regenerative brake duty is,
the more energy the brake resistor consumes, and the stronger the brake capability is.
s
k
r
a
m
e
R
e
g
n
a
R
g
n
it
t
e
S
g
n
it
t
e
S
y
r
o
t
c
a
F
r
e
t
e
m
a
r
a
P
0 If regenerative brake duty is 3% fixed, the value
of parameter 70 is invalid.
30
0
0~1
1 The regenerative brake duty is the value of
parameter 70 setting.
-
-
-
%
0
3
~
0
0
0
7
Note: 1. In occasions where frequent start/stop occurs, a high capacity brake resistor is required.
2. For brake resistor options, please refer to
Section 3.6.3
.
5.15 Carrier Frequency Action Choice (P.31)
P.31 “Carrier frequency action choice”
Soft-PWM
is a method for eliminating motor noises.
Parameter Factory Setting Setting Range
Remarks
No action
Soft-PWM selected when
P.72
5, this function is
only valid under the V/F mode.
31
When P.72 5, if inverter module temperature is too
high, carriers frequency will automatically reduce,
after the module temperature falling, carrier
frequency will automatically restore the value which
P.72 set.
