Lenze DDS Function library Drive - Manual (Page 92)

2.7.5 Process controller (L_PCTRL)
Function library LenzeDrive.lib
Special functions
2−82
L
LenzeDrive.lib EN 1.7
2.7.5.2 Ramp generator
The setpoint at nSet_a is led via a ramp generator with a linear characteristic
(100 %
º 16384 º n
max
(C0011)).
This means that setpoint jumps at the input can be converted into a ramp.
100%
0
tir tif
t ir t if
t
RFG−OUT
[%]
w1
w2
T
ir
+ t
ir
100%
w2 * w1
T
if
+ t
if
100%
w2 * w1
Fig. 2−78 Acceleration and deceleration times of the ramp generator
w1 ,w2 Change of the main setpoint, depending on t
ir
or t
if
RFG−OUT Output of the ramp generator
·
The ramps can be adjusted separately for acceleration and deceleration:
– Acceleration time t
ir
with dnTir
– Deceleration time t
if
with dnTif
·
Using bInAct_b = TRUE sets the ramp generator immediately to 0.
2.7.5.3 Value range of the output signal
·
In the factory setting, the process controller has bipolar operation (bBiUnipolar = 0).
– The output signal is limited to ±100 % (±16384).
·
Using bBiUnipolar = 1 the process controller has unipolar operation.
– The output signal is limited to 0 ... +100 % (0 ... 16384).
2.7.5.4 Evaluation of the output signal
·
The limitation is followed by an evaluation of the output signal by nInflu_a.
– The calculation is done according to the following formula:
nOut_a
+
(Values after the limitation)
@ nInflu_a
16384
2.7.5.5 Deactivation of the process controller
·
bInAct_b = TRUE deactivates the process controller. This means that
– nOut_a is set = 0.
– the I−component is set = 0.
– the ramp generator is set = 0.