YASKAWA Varispeed f7, Programming Manual

Page: 37 / 202

Programming 29
C2 S-Curve Accel / Decel
C2-01 S-Curve Characteristic at Accel Start
C2-02 S-Curve Characteristic at Accel End
C2-03 S-Curve Characteristic at Decel Start
Setting Range:0.00 to 2.50 Seconds
Factory Default:0.20 Seconds
C2-04 S-Curve Characteristic at Decel End
Setting Range:0.00 to 2.50 Seconds
Factory Default:0.00 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,C1-03, C1-05, or C1-07) and back to 0.
Fig. 22 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 active acceleration time. C2-02
will ramp the acceleration rate from the rate of C1-01 or active deceleration time back down to no acceleration
(constant speed). The use of S-Curve characteristics will lengthen the overall acceleration time as follows:
Overall Acceleration Time =
The following figure shows FWD/REV run switching during deceleration to stop.
Fig. 23 S-Curve Timing Diagram - FWD / REV Operation
Output Frequency
Frequency Reference
Output Frequency
S-curve Characteristic
TIME
Time (Tsc)
frequency reference
2
02) - (C2 01) - (C2
Time on Accelerati Active
+
+
FWD Run Command
REV Run Command
Output Frequency
C2-02 C2-03
C2-01
C2-04
DC Injection Braking
Time at Stop
B2-04
C2-01
C2-02 C2-03
C2-04