Download Reference Manual Adjustable Frequency AC Drive

2-116
Detailed Drive Operation
Ramped Spd Ref
S Curve Spd Ref
42
43
Ramp
151
Accel Time
32
Decel Time
33
34
S Curve Time
10
01
Inv
00
Logic
&
157
01
Logic Ctrl State
(SRef Ramp En)
Logic Command
(Spd S Crv En)
151
S Curve
10
01
01
157
02 Logic Ctrl State
(SRef SCrv En)
Logic
The drive can produce a linear ramp output or an s curve signal. The s curve is used
when [Logic Command] bit 1 - "Spd S Curve En" is on and the ramp is not
bypassed. Parameter 34 [S Curve Time] sets the time that the s curve will be applied
at the beginning and at the end of the ramp. Half of the time specified in parameter
34 is added to the beginning of the ramp and half to the end of the ramp (as shown
in the example below). The result of the s curve block can be seen in parameter 43
[S Curve Spd Ref].
Speed
Time in Seconds
0.5 sec.
0.5 sec.
Accel Time = 5.0 seconds
S Curve Time = 1.0 second
Total Ramp Time = 6.0 seconds
Speed Reference Bypass and Delayed Speed Reference
By default, parameter 37 [Spd Ref Bypass] is linked to [S Curve Spd Ref].
However, if you wish to bypass the rest of the speed reference control loop, [Spd
Ref Bypass] gives the capability to link to other parameters.