19
3.3 CONTROL SYSTEM
3.3.1 Description
The
Control System consists of
the
microprocessor and the in-cab controller.
The Microprocessor includes the temperature control
software and necessary input/output circuitry to
inter- face with the in-cab controller.
The in-cab controller is remotely mounted in the
vehicle. The in-cab controller includes the LCD display
and keypad. The keypad and display provide user
access to program the microprocessor and display
information. The information is accessed by keypad
selections and viewed on the display.
3.3.2 Microprocessor module (CPU Board)
The microprocessor controls the following functions:
•
Maintains the box temperature at set point
by regulating the cooling, heat, off mode, and
automatic defrost processes.
•
Sends digital signals to the in-cab controller.
•
Stores parameters
•
Stores fault codes
•
Log run-time hours
•
Controls Relay function
•
Senses safety devices
3.3.3 In-cab controller
The in-cab controller is mounted in the cab and allows the
driver to carry out the control operations:
•
Manual start up and shut-down of the unit
•
Adjust the set point
•
Initiate manual defrosts
•
Adjust Parameters
•
Display Fault Codes
•
Identify Service Intervals
Figure 9 - In-cab Controller
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