Function block library
7-178
SHB9300CRV EN 2.0
7.6.55.2 Ramp generator
The setpoint PCTRL-SET is led by a ramp generator with linear characteristic.Thus, setpoint
step-changes at the input can be transformed into a ramp.
100%
0
t
ir
t
if
T
ir
T
if
t
RFG-OUT
[%]
w1
w2
T
ir
t
ir
100%
w2 w1
T
if
t
if
100%
w2 w1
Fig. 7-140 Acceleration and deceleration times of the ramp generator
l
The ramps can be adjusted separately for acceleration and deceleration.
– Acceleration time t
ir
with C0332.
– Deceleration time t
if
with C0333.
l
PCTRL-INACT = HIGH
– The ramp generator is immediately set to zero.
7.6.55.3 Value range of the output signal
l
The process controller operates bipolar in the default setting.
– The output value is limited to 100 %.
l
The function can be set unipolar under C0337.
– The output value is limited to 0 ... +100 %.
7.6.55.4 Evaluation of the output signal
l
The output signal can be evaluated after the limitation block via PCTRL-INFLU.
– The process controller can be used or suppressed with this evaluation.
– The calcuation is done according to the following formula:
100 % (PCTRL-OUT)= 100 % * 100 % (PCTRL-INFLU).
7.6.55.5 Deactivation of the process controller
l
PCTRL-INACT= HIGH deactivates the process controller
– PCTRL-OUT is set to zero.
– The I-component is set to zero.
– The ramp generator is set to zero.
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