Thermo King SR-2 SmartReefer2, Diagnostic Manual

Page: 55 / 431

Section 3 – SR-2 Software Description
SOFTWARE OPERATION MENU STRUCTURE
The basic menu structure consists of three menus
plus the Temperature Watch
®
screen. See the
following material for a general description of each
menu. See Section 4 for complete operating
instructions.
Software is a very complex set of instructions used
by the microprocessor to control the refrigeration
and interface with the operator. The microprocessor
examines the conditions of all the inputs and
compares them to the instructions contained in the
software. The outputs are then energized as
specified by the software instructions.
•
The Temperature Watch Display shows the
box temperature and setpoint using large
numbers that allow unit conditions to be
checked from a distance.
There is no way to determine from the schematic
what conditions will cause the unit to operate in a
particular mode. This decision is made by the
microprocessor and software after examining all the
input conditions and setpoint. However, operating
mode can usually be deduced from the existing
conditions. As an example, if a 35°F (2°C) setpoint
is selected and the box temperature, as indicated by
the return air sensor is 60°F (16°C), the unit should
operate in Cool mode when turned on.
•
The Main Menu is made up of menu items
intended for the driver or unit operator. The
Main Menu is directly accessible from the
Standard Display using the soft keys at the
bottom of the display
•
The Maintenance Menu is made up of menu
items used to help the service technician
maintain and diagnose the unit. The
Maintenance Menu is indirectly accessible from
the Main Menu.
The SR-2 system requires two versions of software.
The microprocessor software is used for all
operational functions. The HMI software controls
the display screens and operator interface.
•
The Guarded Access Menu is made up of
programmable features that configure the unit,
set sensor grades and allow the customer to
tailor unit operation to his particular
requirements. The Guarded Access Menu is
indirectly accessible from the Maintenance
Menu.
The software is flashloaded using a PC computer.
See Service Procedure A46A and A46B for details.
To check software revision of the microprocessor
and HMI control panel refer to Section 4 of this
manual.
3-5
31 January 2005