1
SECTION 1 INTRODUCTION
1.1 GENERAL DESCRIPTION
The OMEGA
®
CN9000A Series Miniature Autotune
Microprocessor Controllers are designed for accurate, precise
temperature control. They feature high accuracy and reliability, as
well as sophisticated PID or Autotune PID with approach control
(PDPI) for optimal control during start-up and steady-state
operation.
The CN9000A controllers feature models with user selectable
inputs from nine thermocouple types or 2-wire RTD, or models
with 3-wire RTD input. These units are °C/°F switchable, offer a
0.1° resolution up to 200°, and the second setpoint and output are
standard. The controller can also be programmed to accept linear
voltage signals up to 20 mV.
The CN9000A features advanced PDPI control, which enables the
unit to suppress overshoot, and allows the process warm-up to be
tuned independently from the steadystate operating conditions. For
other processes, a user may select PiD (Proportional-Integral-
Derivative), PD (Proportional-Derivative). Proportional, or On/Off
control.
The CN9000A controllers are well suited to a broad range of
applications, and are easy to install and operate. For most
applications, the user need only select the desired input type by
using the front pushbuttons. The CN9000A is ‘pre-set’ for control
parameters which are suitable for most applications. These pre-set
(or default) parameters can be changed by the operator at any
time, in order to fine-tune the controller to an individual process.
The controller can easily be used in the Autotune Mode, allowing
the microprocessor to attempt to calculate the optimum PID
parameters.
Selection of all operational controls is made through the three keys
on the front panel of the CN9000A, with the display prompting the
user for each step. After the parameters have been set, they can
be 'locked-in' by removing the jumper located under the front
bezel. The user may select the control mode and parameters, the
display resolution (1° or 0.1°) and the units (°C/°F). The user may
also utilize the ranging feature of the instrument, which limits the
range in which a setpoint may be chosen, or lock-out an operator
from changing the setpoint.
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