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4.4.1 Start-Stop Configuration
Start-Stop Operation is dependent on both Configuration and Functional Parameter settings. The first setting to be
considered is the START-STOP PARAMETERS Configuration. This setting determines control actions when in the
Perishable Range or Frozen Range. The available settings are TOGETHER and SEPARATE.
• When SEPARATE is chosen the control action will be different, depending on whether the setpoint is in the
Perishable Range or in the Frozen Range (refer to Section 4.6.1).
• When TOGETHER is chosen, the same settings apply to any setpoint.
If TOGETHER is selected, then the following Functional Parameter values will be available for use:
• MINIMUM RUN TIME
• MINIMUM OFF TIME
• RESTART TEMPERATURE
• OVERRIDE TEMP
• MAXIMUM OFF TIME
• FROZEN SHUTDOWN OFFSET
If SEPARATE is selected, then the following Functional Parameter values will be available for use:
• PERISHABLE MINIMUM RUN TIME
• PERISHABLE MINIMUM OFF TIME
• PERISHABLE RESTART TEMPERATURE
• PERISHABLE OVERRIDE TEMP
• PERISHABLE MAXIMUM OFF TIME
• FROZEN MINIMUM RUN TIME
• FROZEN MINIMUM OFF TIME
• FROZEN RESTART TEMPERATURE
• FROZEN OVERRIDE TEMP
• FROZEN MAXIMUM OFF TIME
• FROZEN SHUTDOWN OFFSET
In the event that this Configuration was set to SEPARATE and the eleven Functional Parameters for
Perishable and Frozen have been set and the Configuration is changed from SEPARATE to
TOGETHER, the values from the Perishable settings will be the ones that will be used.
4.4.2 Stop Parameters
Whenever the unit starts in Start-Stop Operation, it will remain in the Start-Stop ON cycle until all of the following
criteria have been satisfied:
1. Unit has run for the selected Minimum Run Time
The MINIMUM RUN TIME is selected in the control system Functional Parameters. The purpose of this is to force
the unit to run long enough to completely circulate the air inside the compartment, and to ensure that the product
temperature is at setpoint. This value may be set from 4 to 60 minutes in 1 minute intervals. The factory default set-
ting is 4 minutes.
If all Start-Stop parameters required to enter a Start-Stop Off cycle have been met except this parameter, the unit
will operate with the compressor and heaters off and the evaporator fan running until this parameter has also been
met.
2. Battery is fully charged - Voltage
A good battery is defined as having 13.1 VDC at 77°F (25°C). The control system will calculate the equivalent volt-
age based on the ambient temperature and shutdown will be allowed when battery voltage is at or above the calcu-
lated value.
The status of the unit battery can be checked by reading the Battery Voltage in the Data List. If “OK.”
appears after the voltage reading, battery voltage is sufficient to allow the unit to cycle off.
If the compressor has cycled off, PSCON will remain energized (to supply power to the battery charger) until the
stop parameter has been met or the greater of the applicable MINIMUM RUN TIME functional parameter setting
has elapsed.
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