Lenze E94A - Manual (Page 529)

Lenze · 9400 function library · Reference manual · DMS 6.7 EN · 08/2014 · TD05
529
5 Function blocks
5.140 L_SdSpeedSet - setpoint ramp generator
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
5.140.3 Ramp generator
Afterwards, the setpoint is led via a ramp generator with S-ramp characteristic. The ramp generator
transfers setpoint step-changes at the input to a ramp.
[5-110] Acceleration and deceleration times
• t
ir
and t
if
are the desired times for changing between w1 and w2.
• S-ramps are possible if an S-ramp time is selected.
• The t
ir
/t
if
values are converted into the required Ti times according to the following formula:
w1, w2 = change of the setpoint as a function of t
ir
or t
if
RFG-OUT = output of the ramp generator
RFG-OUT
100 %
w2
w1
t
0 %
t
ir
t
ir
T
ir
T
ir
T
ir
t
ir
100 %
w2 w1
–
----------------------- ⋅
=
T
if
t
if
100 %
w2 w1
–
----------------------- ⋅
=