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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 P.3. 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 P.3 is:
The equation for the ascending S pattern curve above P.3 is:
t: time f: output frequency
Figure below:
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P.7
P.3
Time
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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Time
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f0
f2
f3
