Lenze DDS Function library Drive - Manual (Page 35)

Function library LenzeDrive.lib
Analog signal processing
2.2.14 Ramp generator (L_RFG)
2−25
L
LenzeDrive.lib EN 1.7
2.2.14.1 Calculation and setting of the acceleration and deceleration times
The acceleration time and deceleration times refer to a change of the output value from 0 to 100 %
(100% = 16384). The times to be set: T
ir
and T
if
can be calculated from the formula in Fig. 2−27:
100%
0
tir tif
T ir T if
t
nOut_a
[%]
w1
w2
T
ir
+ t
ir
100%
w2 * w1
T
if
+ t
if
100%
w2 * w1
Fig. 2−27 Acceleration and deceleration times of L_RFG
w1, w2 Change of the main setpoint, depending on t
ir
resp. t
if
Here t
ir
and t
if
are the required times for the change between w1 and w2
.
The calculated values T
ir
and T
if
are entered under dnTir and dnTif.
2.2.14.2 Loading of the ramp generator
By using nSet_a and bLoad_b you can initialize the ramp generator with defined values.
·
As long as bLoad_b = TRUE, the signal at nSet_a is output to nOut_a.
·
If bLoad_b is set = FALSE, then the ramp generator runs with the preset T
i
−times from the
loaded value through nSet_a to the value at nIn_a.
Note!
16384
º 100 % º C0011 (n
max
)