C2 S-Curve Acc/Dec - YASKAWA E7U Programming Manual

C2 S-Curve Acc
C2-01 S-Curve Characteristic at Accel Start
C2-02 S-Curve Characteristic at Accel End
Setting Range:0.00 to 2.50 Seconds
Factory Default:0.20 Seconds
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.
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 Acceleration Time =
FWD Run Command
REV Run Command
Output Frequency
Speed Command
Frequency Reference
Output Frequency
S-curve Characteristic
Time (Tsc)
Fig. 22 S-curve Characteristic Timing Diagram
Active Accelerati on
C2-02
C2-01
Forward
Acceleration
Fig. 23 S-Curve Characteristic Timing Diagram
Output Frequency
+
(C2 - 01) (C2 -
+
Time
2
Programming 28
TIME
02)
Reverse
Acceleration
t
TIME
t
t