60
4. Parameter description
Parameter
•
When
P.29=1
,
‘
S pattern acceleration/deceleration curve 1
’
The acceleration slope is formed by combination of P.7 and P3. The deceleration slope is formed
by combination of P.8 and P.3.
The
‘
acceleration /deceleration curve
’
possesses S-shape.
The equation for the ascending S pattern curve between 0 and Pr3 is:
The equation for the ascending S pattern curve above Pr3 is:
t: time f: output frequency
Figure below:
A
cc
el
er
at
io
n
sl
op
e
Note: This pattern is applicable to main shafts of the working machines.
•
When
P.29=2
,
‘
S pattern acceleration/deceleration curve 2
’
An acceleration slope is formed by combination of P.7 and P.20. A deceleration slope is formed by
combination of P.8 and P.20.
When the target frequency varies, it increases with the
‘
acceleration slope
’
or decreases with the
‘
deceleration slope
’
. As shown in the figure below, when the setting value of the inverter is
adjusted from f0 to f2, an acceleration in S pattern is undertook once, and the time is
P.7
×
(f2-f0)/P.20; then if the frequency is set from f2 to f3, a second acceleration is experienced,
and the time is P.7
×
(f3-f2)/P.20. Figure below:
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