MP-3000 Controller
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Data Recording and
Downloading Data
The MP-3000 data logger can record sensor
temperatures as well as loss of power, alarms,
sensor failure, setpoint change and unit shutdown
events. All data logs include the time and date;
setpoint temperature; supply, return, ambient,
USDA1, USDA2 and USDA3 sensor
temperatures; and humidity sensor. All
temperature logs can be viewed from the
controller’s LCD message display.
Data logging intervals are selectable from 1
minute or 0.5, 1, 2 or 4 hours. The 1 minute
interval is intended for special data recording or
diagnosis requirements.
When a 1 hour logging interval is selected, the
data logger memory can store approximately 680
days of information. The logging of USDA
sensors is fixed at 1 hour intervals to comply with
USDA requirements. A logging test of USDA
sensors at 1 minute intervals is possible for 72
minutes. USDA data can not be downloaded
during the logging test. After 72 minutes,
controller returns to previous logging interval and
clears USDA test data from data logger memory.
If the unit power supply is disconnected, the data
logger will continue to register 120 temperature
logs (except humidity sensor) when battery
voltage is above 11.4 volts. These will be
maintained until the unit is re-connected to power,
and the battery automatically recharged.
Trip data can be retrieved (but not erased) from
the data-logger memory using a DRU-II or
SmartSpongeâ„¢ handheld data retriever, or a
REFCON power line remote monitoring system.
DRU-II data transfer rate based on a 1 hour log
interval is about 15 seconds per month of event
logs and about 70 seconds per month of
temperature logs. For example, downloading 90
days of data logs would take about 95 seconds for
event logs only and about 210 seconds for
temperature logs only.
Trip data from separate units is denoted by the
identification information entered into the
controller at the beginning of the trip via the
general purpose keypad. Identification data may
include the container ID number, location B.R.T.,
contents, loading data, voyage no., ship, load port,
discharge port and comments. The container ID
number is stored in the Configuration submenu.
General Theory Of Operation
The MPC-3000 controller uses advanced
solid-state integrated circuits to monitor and
control unit functions. The controller monitors
inputs from:
• Supply air sensor, left hand
• Supply air sensor, right hand
• Return air sensor
• Evaporator coil sensor
• Condenser coil sensor
• Ambient sensor
• Humidity sensor
• USDA (Spare) sensors 1, 2 and 3
• Compressor discharge line temperature sensor
• Low Pressure Cutout Switch
• Phase measuring circuits
• Current measuring circuits
• Voltage measuring circuits
Output signals from the controller automatically
regulate all unit functions including:
• Compressor operation
• Condenser fan operation
• Evaporator fan motor operation
• Warm gas bypass solenoid valve
• Stepper motor valve
• Liquid injection valve
• Dehumidify (coil) valve
• Electric heaters
• Phase selection
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