Installation manual
Series C Controller Configuration and Operation Manual
1-2 Athena Controls, Inc. 900M050U00
1.1.2 What to Read
This manual contains a comprehensive discussion of all the controller functions.
Some of the information may not apply to your situation.
If you are a process operator, read Sections 1, 2, and 19. If the controller does not
behave as you expect, read Section 20.
If you are a process engineer responsible for configuring the controller, have used
Athena Series C controllers before, and plan to use PID control, read Sections 3, 16,
and 17.
If you are a process engineer responsible for configuring the controller and have
never set up an Athena Series C controller before, look at Section 1 through 17,
reading anything that applies to your control strategy.
If you are a programmer responsible for programming a MODBUS host to
communicate with the controllers, read Section 1 and those portions of Sections 4
through 17 that apply to your control strategy.
1.2 Features and Benefits of Series C Controllers
1.2.1 PID and On/Off Control
The 1ZC, 16C, 18C, and 25C controllers can be equipped with one or two outputs to
implement PID and on/off control. All also support a manual mode that overrides
automatic control. In manual mode you control the outputs by entering a fixed output
percentage value. Transfer from PID to manual is “bumpless”. Information about the
advantages of each of these two supported control types is in 1.5.
When PID control is selected, you can take advantage of the controllers’ Autotune feature
for easy tuning of the proportional, integral, and derivative components of the control
algorithm.
1.2.2 Convenient User Interface
The panel-mounted 16C, 18C, and 25C are all equipped with a bright two-line LED
display that is easy to read over wide viewing angles.
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During normal operations the
process value is always on display. The setpoint can also be displayed at all times. If
you prefer, the setpoint can be “blanked”, that is, it can be turned off after a configurable
time period. Pressing any key displays the setpoint again.
The 16C, 18C, and 25C keypad consists of four keys:
mode/enter – used to access the displays used to change the mode or
security access level, as well as to write values to the controller’s database and
step through items within a configuration menu
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The compact 1ZC does not include a display. It does have LEDs to signal which functions are active.
The 1ZC is designed to be mounted on DIN rails in a cabinet. It is configured and its process value is
read using a personal computer. See Using the MODBUS Protocol with Athena Series C Controllers or
the Multi-Comm User’s Guide.