YASKAWA iQpump Series

32 YASKAWA TM.iQp.02 iQpump Drive Programming Manual
◆ C2 S-Curve Acc
■ S-Curve Characteristics
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
Figure 25 S-curve Characteristic Timing Diagram
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:
Figure 1. 26
Figure 26 S-Curve Characteristic Timing Diagram
Parameter No. Parameter Name
C2-01
S-Curve Characteristic at Start
C2-02 S-Curve Characteristic at Stop
Output Frequency
Frequency Reference
Output Frequency
S-curve Characteristic
TIME
Time (Tsc)
Speed Command
Overall Aceleration Time Active Acceleration Time
C2-01()C2-02()+
2
----------------------------------------------+=
FWD Run Command
REV Run Command
Forward
Acceleration
t
t
t
Reverse
Acceler
ation
C2-01
C2-02
Output Frequency
TIME