Parameter Description
Parameter Description
60
• When P.29=3, “S pattern acceleration /deceleration curve 3”
1) The parameters P.255, P.256, P.257 and P.258 are used to start the inverter gradually without
impact. And varying degrees of S pattern acceleration/deceleration curve are adjusted by the
values. When the S pattern acceleration/acceleration curve is started, the inverter will
accelerate/decelerate with different speed according to the primary acceleration/deceleration
time.
2) When S pattern acceleration/deceleration curve 3 is selected, the acceleration/ deceleration
time will be longer, as follows.
3) When the selected acceleration time (P.7 or P.44)≥P.255 and P.256, the actual acceleration
time is as follows:
The actual acceleration time = The selected acceleration time + (P.255 + P.256）/ 2
4) When the selected deceleration time (P.8 or P.45)≥P.257 and P.258, the actual deceleration
time is as follows:
The actual deceleration time = The selected deceleration time + (P.257 + P.258）/ 2
Example：When the parameters are initial value (60 Hz system), the actual acceleration time from
0Hz to 60Hz in accordance with S pattern acceleration/deceleration curve 3 is as follows:
The acceleration time being set T1 = (P.20 - P.13) * P.7 / P.20
The actual acceleration time T2= T1 + (P.255 + P.256 ) * (P.20 - P.13) / 2 / P.20
So T1 = (60 - 0.5) * 5 / 60 = 4.96s (the actual acceleration time of linear acceleration)
The actual acceleration time T2 = 4.96 + (0.2 + 0.2) * (60 - 0.5) / 2 / 60 = 5.16s
Note: All calculations of acceleration/deceleration time are base on P.20.
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