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T-305
3.6.4 Logging Interval (dCF03)
The user may configure four time intervals between
data recordings. Data is logged at exact intervals in
accordance with the real time clock. The clock is factory
set at Greenwich Mean Time.
3.6.5 Thermistor Format (dCF04)
The user may configure the format in which the
thermistor readings are recorded. The low resolution is
a 1 byte format and the normal resolution is a 2 byte
format. The low requires less memory and records
temperature in 0.255C (0.455F) steps when in the
perishable mode or 0.55C (0.95F) steps when in the
frozen mode. The normal records temperature in
0.015C (0.025F) steps for the entire range.
3.6.6 Sampling Type (dCF05 & dCF06)
Three types of data sampling are available, average,
snapshot and USDA. When configured to average, the
average of readings taken every minute over the
recording period is recorded. When configured to
snapshot, the sensor reading at the log intervale time is
recorded. When USDA is configured the supply and
return temperature readings are averaged and the 3
USDA probe readings are snapshot.
3.6.7 Alarm Configuration (dCF07 -- dCF10)
The USDA and cargo probe alarms may be configured
to OFF, ON or AUTO.
If a probe alarm is configured to OFF, then the alarm for
this probe is always disabled.
If a probe alarm is configured to ON, then the associated
alarm is always enabled.
If the probes are configured to AUTO, they act as a
group. This function is designed to assist users who
keep their DataCORDER configured for USDA
recording, but do not install the probes for every trip. If all
the probes are disconnected, no alarms are activated.
As soon as one of the probes is installed , then all of the
alarms are enabled and the remaining probes that are
not installed will give active alarm indications.
The DataCORDER will record the initiation of a pre-trip
test (refer to section 3.5, page 22) and the results of
each of the tests included in pre--trip. The data is
time-stamped and may be extracted via the Data
Retrieval program. Refer to Table 10, page 43 for a
description of the data stored in the DataCORDER for
each corresponding Pre-Trip test.
3.6.8 DataCORDER Power-Up
The DataCORDER may be powered up in any one of
four ways:
1.
Normal AC power:
The DataCORDER is powered
up when the unit is turned on via the stop-start switch.
2.
Controller DC battery pack power:
If a battery pack
is installed, the DataCORDER will power up for
communication when an interrogation cable is plugged
into an interrogation receptacle.
3. External
DC battery pack power:
A 12 volt battery
pack may also be plugged into the back of the
interrogation cable, which is then plugged into an
interrogation port. No controller battery pack is required
with this method.
4.
Real Time Clock demand:
If the DataCORDER is
equipped with a charged battery pack and AC power is
not present, the DataCORDER will power up when the
real time clock indicates that a data recording should
take place. When the DataCORDER is finished
recording, it will power down.
3.6.9 Pre-Trip Data Recording
On every DataCORDER power-up, while using
battery-pack power, the controller will first perform a
hardware voltage check on the battery. If the hardware
check passes, the Controller will energize the
appropriate circuitry and perform a software battery
voltage check before DataCORDER logging. If either
the hardware or software battery test fails, the real time
clock battery-backed power-up will be disabled until the
next AC power cycle. Further DataCORDER
temperature logging will be prohibited until that time.
If the DataCORDER has a battery pack, then the battery
voltage will be tested once every five minutes. An alarm
will be generated when the battery voltage transitions
from good to bad indicating that the battery pack needs
recharging. If the alarm condition persists for more than
24 hours on continuous AC power, the battery pack
needs replacement.
3.6.10 DataCORDER Communications
Data retrieval from the DataCORDER can be
accomplished by using one of the following;
DataReader, DataLine/DataView or a communications
interface module.
NOTE
A DataReader, DataLine/DataView or a com-
munications interface module display of Com-
munication Failed is caused by faulty data
transfer between the datacorder and the data
retrieval device. Common causes include:
1. Bad cable or connection between DataCORDER
and data retrieval device.
2. PC communication port(s) unavailable or misas-
signed.
3. Chart Recorder Fuse (FCR) blown .
a. Scroll Back
The DataCORDER will display probe values for the six
temperature probes. the display may be up to 99 hours
back from the current hour or up to 30 days back,
depending on software revision installed. To display the
probe values do the following:
1. Depress the ALT. MODE key and then depress the
UP or DOWN ARROW keys until “dCdSP” is shown
in the left display window and then depress the EN-
TER key.
2. The sensor to display can then be chosen by de-
pressing the UP or DOWN ARROW key until the de-
sired sensor (S for supply; r for return; P1, P2, P3 for
USDA; and C4 for Cargo) is shown in the left display
window and then depressing the ENTER key.
3. For 99 hour displays, a temperature value will ap-
pear in the right display window and 1 (with sensor
designation) will appear in the left display window to
signify the temperature displayed is the most recent
reading.
For 30 day displays, the display will show the reading
day and hour on the left display and the sensor read-
ing on the right. For example:
Summary of Contents for 69NT40-489-100 Series
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Page 167: ...143 T 305 Based on drawings 62 10526 Rev and 62 10736 Rev Figure 90 Electrical Schematic CA...
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