12
one to decrease a parameter. (For example:
Humidify/Dehumidify, Heat/Cool.)
The Controller can be programmed as a simple ON/OFF
system, but is usually programmed to provide proportional
control. In this mode the controller constantly monitors the
respective parameter and updates the operating system
characteristics to match those of the function being
controlled. Power to the operating systems will then be
pulsed at a rate that, depending on the sensor and operating
system, is capable of maintaining the parameter, at the
sensor, to within 0.2 of the set point parameter.
4.1.2.1 Front Panel
A CAL 3300 microprocessor control module provides
the PID (Proportional, Integral, Derivative) control.
Section 4.3.4 describes programming and adjustment
procedures. Also, refer to the respective CAL
manual(s) supplied along with this manual.
The Series 5000 Microprocessor Controllers are
capable of controlling and/or alarming virtually any
process by making available either constant or pulsed
AC to the operating system. The major variable is in
the programming of the control (Refer to Section 4.3.4
and the accompanying CAL manual for programming
and adjustment information.)
The function control switches allow the user to
manually disable the controlled outputs. This is very
convenient if the user wants to shut off the operating
system without having to disturb the control module
settings.
DECR – Allows the user to manually disable the
decrease control function of the system. For normal
operation, the switch should be in the “On” (“I”)
position. When the microprocessor activates the
decrease function, the red LED on the control module
display will light.
INCR – Allows the user to manually disable the
increase function of the system. For normal operation,
the switch should be in the “On” (“I”) position. When
the microprocessor activates the increase function,
the green LED on the display will light.