Yaskawa VS-626 MC5 - Manual (Page 159)

7.3 Common Functions
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7.3.2 Tuning Constants: C
J S-curve Characteristic Function: C2-01 to C2-04
D Using the S-curve characteristic function for acceleration and deceleration can reduce shock to the ma-
chinery when stopping and starting.
D With the Inverter, S-curve characteristic times can be set respectively for beginning acceleration, end-
ing acceleration, beginning deceleration, and ending deceleration.
User
Change
during Setting Factory
Valid Access Levels User
Constant
Number
Name
during
Opera-
tion
Setting
Range Unit
Factory
Setting Open Loop
Vector
Flux Vector
C2-01
S-curve characteristic
time at acceleration start
0.00 to 2.50 s 0.20 A A
C2-02
S-curve characteristic
time at acceleration end
0.00 to 2.50 s 0.20 A A
C2-03
S-curve characteristic
time at deceleration start
0.00 to 2.50 s 0.20 A A
C2-04
S-curve characteristic
time at deceleration end
0.00 to 2.50 s 0.00 A A
D The relation between these constants is shown in Figure 7.11.
Output
frequency
C2-01
C2-02 C2-03
C2-04
Time
Run command OFF ON
Fig
7.11 Setting S-curve Characteristics
D When the S-curve characteristic time is set, the acceleration and deceleration times will be lengthened
as follows:
x Acceleration time =
Selected acceleration time + (S-curve at beginning of acceleration + S-curve at end of acceleration)
/ 2
x Deceleration time =
Selected deceleration time + (S-curve at beginning of deceleration + S-curve at end of decelera-
tion) / 2
7