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This data is recorded for a minimum of 1500 hours of
unit operation (the equivalent of 62 days continuous
running operation or approximately 120 calendar days of
average container utilization) and can be printed out for
each hour interval. A backup battery saves data in the
DataCORDER during periods of unpowered service.
For USDA recording requirements a (optional)
backup battery for data recording during periods of
unpowered service (for up to 8 days), and receptacle for
three remote mounted PT100 resistance temperature
detector (RTD) probes are available.
g.
Provide a convenient environmentally protected
portable computer which can be easily carried from unit
to unit to interrogate each unit during or at the end of
each trip and then is capable of either directly printing
this data out in short or long form reports or transfer the
data into a PC computer for long-term storage on floppy
or hard disk storage. The data can be displayed in tabular
form.
The interrogator will not erase the data from the unit
DataCORDER memory. After 1500 hours of data
recording, the older data will be overwritten by the latest
reading.(Refer to section 1.13.5 TP00 & TP01)
h. Provide a two-way communication link to transmit
operational and stored unit data to a remote computer
communication center and the ability to allow remote
control of refrigeration unit operation, pre-trip initia-
tion, defrost initiation, set point change, defrost interval
_C or _F, in-range tolerance, time delay start interval and
current limiting.
i.
For software revision number 106 or greater, provide
the ability to select or change Codes 26 to 32 without AC
power being hooked up. (Refer to section 1.13.9)
1.13.2 General Layout of Control Center
The entire Computer Control --- Electronic Center is
housed in one control box consisting of a control panel
which has the annunciator board and display board
attached behind it. The relay board and logic board are
secured above the control panel. Locking push-on
connectors are used to attach the wiring of the unit to the
logic and relay boards. Gold-plated terminals are used to
ensure reliable electrical connections and eliminate
corrosion. The microprocessor control box is designed to
permit ease of installation and removal and allows rapid
replacement of the microprocessor on-board the ship.
This permits analysis and repair of the control center at
more convenient repair areas aboard ship or elsewhere.
All control functions are accessed or viewed through
a display panel designed for optimum user friendliness
and convenience.
The display panel is mounted at a 15-degree
downward tilt to aid in visibility when stacked in close
quarters and consists of:
a. Twelve (12) push energized membrane switches
(keypad) are dedicated to the following functions:
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Key
Function
Arrow Up
Change set point upward.
Change codes upward.
Scan alarm list upward.
Change user selectable
features upward.
Pre-trip advance forward.
Arrow Down
Change set point downward.
Change codes downward.
Scan alarm list downward.
Change user selectable
features downward.
Pre-trip repeat backward.
Return/Supply
Displays non-controlling probe
temperature (momentary dis-
play).
Displays alternate units
_C/_F
temperature scale (momentary
display).
Alarm Reset
Clears alarm light and alarm
memory (when followed by En-
ter key).
Code Select
Access function codes (see ar-
row up and arrow down).
Defrost Interval
Displays selected defrost inter-
val.
Pre-Trip
Initiate
(when followed by Enter key).
Discontinues pre-trip in prog-
ress.
Manual Defrost
Initiates a defrost cycle when
pressed. (In addition, a sepa-
rate toggle switch on the elec-
tric control box door is pro-
vided.)
Enter
Entering a set point change.
Extending to 30 seconds the
time a chosen function code is
displayed. Entering a code se-
lect mode to interrogate the
alarm list. Entering the value of
a user selectable mode. Clear-
ing the alarm list and initiating
pre-trip.
b. Two (2) large LCD's (19mm/0.748 inch --- high) which
are easily viewed in direct sunlight and backlighted for
superior nighttime visibility.
c. Five (5) Mode Indicator Lights
---
Cool
---
Heat
---
Defrost
---
In-Range
---
Alarm
d. Two (2) (Yellow) --- high intensity light emitting
diodes (LED) for return or supply air probe display
indication.
1-14
pre-trip
inspection
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