65
Parameter Description
Parameter Description
Note: This pattern is applicable to the mainframes of working machines.
• The S-shape acceleration/deceleration curve 2 when P.29=2
An acceleration slope is formed by combining P.7
and P.20. A deceleration slope is formed by
combining P.8
and P.20.
The target frequency increases and decreases as the acceleration and deceleration slopes presented
in the figure below. As shown in the figure below, adjusting the setting value of the inverter from f0
to f2 will result in S-shape acceleration with a time equal to P.7× (f2-f0)/P.20. On the other hand,
adjusting the setting value of the inverter from f2 to f3 will result in S-shape acceleration with a
time equal to P.7× (f3-f2)/P.20. See the figure below.
Note: This s-shape pattern enables a substantial motor vibration reduction during the acceleration/deceleration, and
thus extends the life span of the belts and the gears.
5.14 Regenerative Brake (P.30, P.70)
P.30 “Regenerative function selection”
P.70 “Special regenerative brake duty”
Changing the output frequency from high to low will cause the motor speed to be greater than the
output frequency of the inverter due to load inertia and thereby inducing the generator effect. In
this case, a high voltage will exist between the main-circuit terminals +/P and -/N and damage the
inverter. Therefore, a proper brake resistor shall be mounted between terminals +/P and PR to
dissipate the feedback energy.
A
c
c
e
l
e
r
a
t
i
o
n
s
l
o
p
e
Output frequency
P.7
P.3
Time
A
c
c
e
l
e
r
a
t
i
o
n
s
l
op
e
Time
Output frequency
f0
f2
f3
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