YASKAWA iQpump Series Programming Manual page 32

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C2 S-Curve Acc
S-Curve Characteristics
■
Parameter No.
C2-01 S-Curve Characteristic at Start
C2-02 S-Curve Characteristic at Stop
Setting Range: 0.00 to 2.50 sec
Factory Default: 0.20 sec
Parameters C2-01 and C2-02 will affect the acceleration rate of the output frequency in order to reduce shock to the load. The S-curve
addition to the acceleration profile can ramp the acceleration rate from a 0 to the rate specified by the active Acceleration Time (C1-01 or
C1-03) and back to 0.
Figure 1.25
The S-Curve transition into and out of the active acceleration rate can be programmed independently. C2-01 will ramp up the
acceleration from no acceleration up to the rate of C1-01 or C1-03. C2-02 will ramp the acceleration rate from the rate of C1-01 or C1-03
back down to no acceleration (constant speed). The use of S-Curve characteristics will lengthen the overall acceleration time as follows:
Overall Aceleration Time = Active Acceleration Time
Figure 1.26
FWD Run Command
REV Run Command
Output Frequency
32
Speed Command
Frequency Reference
Output Frequency
S-curve Characteristic
Time (Tsc)
Figure 25 S-curve Characteristic Timing Diagram
(
C2-01
+ --------------------------------------------- -
C2-02
C2-01
Forward
Acceleration
Figure 26 S-Curve Characteristic Timing Diagram
Parameter Name
Output Frequency
) ( )
+ C2-02
2
Reverse
Acceleration
TIME
t
TIME
t
t
YASKAWA TM.iQp.02 iQpump Drive Programming Manual