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1.3.7
Fuzzy Control
The function of Fuzzy control is to adjust PID parameters from time to time in order to
make manipulation output value more flexible and adaptive to various processes. The results are to
enable a process to reach a predetermined set point in the shortest time with the minimum of
overshoot and undershoot during power-up or external load disturbance.
1.3.8
Auto-tuning
The auto-tuning function allows the user to simplify initial setup for a new system. A
clever algorithm is provided to obtain an optimal set of control parameters for the process, and it can
be applied either as the process is warming up ( cold start ) or as the process has been in steady
state ( warm start ).
1.3.9
Lockout Protection
According to actual security requirement, a password is provided to prevent the unit from
being changed abnormally.
1.3.10
Bumpless Transfer
Bumpless transfer allows the controller to continue to control by using its previous value as
the sensor breaks. Hence, the process can be well controlled temporarily as like the sensor is
normal.
1.3.11
Digital Filter
A first order low pass filter with a programmable time constant is used to improve the
stability of process value. This is particularly useful in certain application where the process value is
too unstable to read.
1.3.12
Soft-start Ramp
The ramping function is performed during power up as well as any time the set point is
changed. It can be ramping up or ramping down. The process value will reach the set point with a
predetermined constant rate.
1.3.13
Pump Control
In addition the fast sampling rate, this Process Control Card has superior noise rejection
capability. So it can be used for pressure control of a Pump which is driven by Variable Frequency
Drives.
1.4 Expansion I/O Modules for PID
The Paperless Recorder have the option to use PID function on it by using the
Process Control Card in to it on the one of the 4 rear slots .
1.4.1
PID Control Module
This module is useful for single loop PID Control. This consists of Two
Signal Inputs, one Event Input and control output and Alarm output as per the specification.
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