User Manual For - CONTROLLER/DATA RECORDER MultiCon CMC-99/141
Fuzzy logic block
Step changes in the Set point value can be mitigated by the use of the fuzzy logic block,
which inserts speed control of the Set point value change. Thanks to its application the user
may dictate how quickly a fuzzy value approximates the target value in the process (
Set point
channel
).
This feature is particularly useful in systems where too rapid change in the Set point
value and, as it is possible in such a situation, the control signal, could lead to unwanted
behaviour on the part of an object, for instance: destruction of the product being
manufactured. It is also possible to set the minimum difference between the Set point value,
and the fuzzy logic setpoint, beyond which the controller step changes the fuzzy setpoint to
the Set point value. This is defined by the
Hysteresis
parameter.
The inertial block
This is used to smooth the progress of the derivative block response, in other words to
eliminate overly dynamic changes in the output signal’s value caused by the presence of
measurement process noise. The use of the inertial block lengthens response time, but
provides protection against over-regulation that could lead to failures in the controlled system.
Dead zone
The insertion of this parameter provides the possibility of "anesthetising" the control
system to small deviations in the measured value from the setpoint. The
Dead zone
parameter specifies the minimum deviations, to which the controller should react. The use of
the
Dead zone
is justified in systems, for which oscillation around the setpoint is a natural
behaviour.
Autotuning
The autotuning process is divided into three phases and after their completion the
device automatically switches to operation depending on
Mode
in Controller running modes
parameter block (see
Chapter
7.8.7 Logical Channels - Controller mode
). The duration of
the auto-tuning process depends on the properties of the controlled system. When the device
is during the autotuning process, a visible icon appears on the information bar.
During normal operation of the controller, when the user wants to carry out the
autotuning process and the
Mode
is
from log. channel
, before starting (after triggering
autotuning) a message will appear about the ongoing adjustment process and confirmation
this message will take user to the autotuning process. If the controller is turned off, this
message will not appear.
The Start Autotuning button on a gray background means, that this controller has not
been connected to the logical channel, therefore it is inactive. When the user wants to
activate it, must define a logical channel in the controller mode with the appropriate controller
number.
Attention!!!
During autotuning, is not advisable to regulate the actual
technological processes, because autotuning can damage the products
produced in this process
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