1-23
The operator can display Hours Since Last Trip Start
by just depressing and holding this keypad switch.
Each one hour interval of the DataCORDER is
called a TIC. All events that occur are recorded at the
TIC following the event. Multiple occurrences of the
same event between TIC’s are not recorded; only the last
event.
A special type of recording is provided for USDA
cold treatment purposes. Cold treatment recording
requires either two or three remote probes that are
placed in the cargo at various locations. Provision is
made to connect these probes to the DataCORDER via
receptacles located at the rear left-hand side of the unit.
Four receptacles are provided. Three (four pin) are for
the probes and one (five pin) is provided for the
interrogator. All receptacles are sized to accept a
MIL-C-5015-14S size plug with a bayonet locking ring.
The DataCORDER inputs are designed to accept a four
wire PT100 RTD (resistance temperature detector)
probe.
A label on the back panel of the unit shows which
receptacle is used for each probe. The USDA #1 and #2
probes are installed in their receptacles. The other
receptacle is used for the third cold treatment probe as
well as the standard DataCORDER return probe.
Therefore, when cold treatment is begun, the unit return
probe must be removed from this receptacle and installed
in a dummy receptacle next to it. The third cold
treatment probe (referred to as the “RTN” probe) can
then be installed.(See Figure 1-2.)
The five pin receptacle is used to latch in the USDA
back-up battery and for probe calibration at the
beginning of the cold treatment. These functions are
performed by the interrogator with a special
interconnecting cable and software. Contact the Carrier
service representative for details.
The DataCORDER records four probe temperature
(supply, return, USDA #1 and USDA #2) every minute
over the hour interval to calculate an average
temperature for recording at the clock TIC. If the
setpoint at the time of the TIC is within the cold
treatment range of 27-38
_
F, it is assumed that a
treatment is in progress and the temperatures recorded
are snapshot or instantaneous values. If the setpoint is
outside the cold treatment range, the average
temperature is recorded.
The standard DataCORDER report displays the
supply and return air temperatures. The cold treatment
report displays USDA #1, USDA #2 and the return air
temperature. Cold treatment recording is backed up by a
battery so recording can continue if AC power is lost. The
battery capacity is sufficient to allow recording for eight
days at 0
_
F ambient. After eight consecutive days of
battery backed up recording, the controller automatically
disconnects the battery from the DataCORDER to
prevent its damage. The battery is housed in a module
that also contains a charger to maintain or restore battery
capacity when AC power is on. This module is located on
a stud plate in the lower left corner of the unit.
When the dehumidification mode is activated or
de-activated (ie., Code 32 is turned ON or OFF), this
status is stored in the DataCorder memory and reported
at the next TIC. Note: All microprocessors with revision
104 software will have dehumidification capability but
some units are NOT equipped with a humidistat. Refer to
Table 1-1 model chart to see which units have a
humidistat.
Two diagnostic alarms are provided for the
DataCORDER.
TP00 --- This alarm indicates that the memory is
almost full and the recorder will soon start to overwrite
the oldest data.
TP01 --- This alarm indicates that the recorder is
overwriting the oldest data.
This will happen
approximately every 55-62 days depending on the
number of events that have been stored with the
temperature data. It is recommended that data be
downloaded from the recorder to safe storage at the end
of each trip and no later than when a TP00 alarm occurs.
Otherwise data will be lost.
NOTE
TP00 and TP01 alarms are reset by trip starting
the unit and then pressing the alarm reset and
Enter
key.
1.13.8 Communications
a. DataCORDER Retrieval --- Interrogation
Data retrieval from the DataCORDER can be
accomplished with two devices: (1) a stand-alone DOS
base portable computer with appropriate cable and
software or (2) the Husky “Hunter” computer with
appropriate cable and software. Both are battery
operated portable computers. The main difference
between them is that the Husky computer has smaller
memory storage and consequently is designed to be used
with a desktop PC for downloading, data storage and
output processing. These functions can be performed on
the portable computer using floppy disks. The main
advantage of the Husky is its smaller size, weight and
superior durability in harsh environments.
The interrogation software for the portable
computer is supplied on a 3.5 inch floppy disk. This
software allows interrogation, screen view of the data,
hard copy report generation, cold treatment probe
calibration, cold treatment initialization and file
management. With a double sided double density disk,
the portable computer can store approximately 2995 trip
days of data. This is equivalent to interrogation of 100
units with an average trip length of 29.9 days.
With a few menu driven keystrokes, either computer
can read the DataCORDER.
A short report on that interrogation can be displayed
on the computer to identify key information such as Trip
Start, Power Outages, and Temperature Out-of-Range
conditions.
The Husky computer comes with an IBM PC
compatible program loaded on a 5-1/4” floppy disk which
allows the customer to custom install a report format to
the user’s requirements.
Downloaded from
