Operating Instructions
38
The microprocessor components are located inside the control
box, which is located inside the lower roadside service door.
The microprocessor is connected to a Human Machine
Interface (HMI) Control Panel. It is used to operate the unit.
The USB ports are used to retrieve data from the data logging
system.
Microprocessor On/Off Switch:
This switch supplies or
removes electrical power to the microprocessor. The
Microprocessor Power Switch is located above HMI Control
Panel. It is hidden when the lower roadside body panel
surrounding the Control Box is closed.
Control Panel
The control panel has a display and eight touch sensitive keys.
The display is capable of showing both text and graphics. The
four keys on the left and right sides of the display are “hard”
(dedicated) keys. The four keys under the display are “soft”
keys. The function of “soft” keys change depending on the
operation being performed. If a soft key is active, its function
will be shown in the display directly above the key.
Control Panel Display
The display is used to supply unit information to the operator.
This information includes setpoint, current box temperature
operating information, unit gauge readings, system
temperatures and other information as selected by the operator.
The default display is called the Standard Display. It is shown
in Figure 21 and will be described in detail later in this chapter.
WARNING: The unit can start at any time without
warning. Press the
O
FF
key on the control panel and
place the microprocessor On/Off switch in the Off
position before inspecting or servicing any part of the
unit.
