Carrier TRANSICOLD VECTOR 8100 Operation & Service Manual Download

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4–4

3. Battery is fully charged - Amperage

The control system will calculate the average current draw over a 20 second period. Once this average drops
below the selected value, shutdown will be allowed. The CURRENT FOR START-STOP SHUTOFF is selected in
the control system Configurations. The value may be set from 1 to 10 amps in 0.5 amp intervals. The factory
default setting is 7 amps.

If the compressor has cycled off, PSCON will remain energized (to supply power to the battery charger) until bat-
tery amperage draw is less than 7.0 amps.

4. Compartment temperature requirement is satisfied

In Start-Stop Operation the refrigeration system will operate in Pulldown or Pull-Up Mode in order to reach the shut-
down condition as quickly as possible.

Shutdown will be allowed when the compartment temperature is within 0.5°F (0.3°C) of setpoint, for operation in
Perishable Range. In Frozen Range, shutdown will be allowed when the compartment temperature is calculated to
be within 0.5°F minus the FROZEN SHUTDOWN OFFSET (0.3°C minus the FROZEN SHUTDOWN OFFSET) of
setpoint.

The FROZEN SHUTDOWN OFFSET Functional Parameter may be set from 0 to 1.1°F (0 to 0.6°C). The factory
default setting is 0°F (0°C).

If the temperature requirement has been satisfied while one of the other shutdown requirements has not been met,
the unit will operate with the compressor and heaters off and the evaporator fan running until this parameter has
also been met.

4.4.3

Re-Start Parameters

While the unit is in a Start-Stop OFF Cycle, restart will be initiated when

one

of the following conditions occurs:

NOTE

In Start-Stop Operation, when the setpoint is in the frozen range (refer to

Section 4.6.1

), the unit will

not restart when temperature is below setpoint except as indicated in the following.

1. Battery voltage falls below selected Configuration value

The control system will monitor battery voltage. The value may be set from 12.0 to 12.8 volts. The factory default
setting is 12.2 volts.

TIP

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 this is the only reason operation is required, the unit will operate as if it is in Continuous Operation until the
requirement has been met.

2. Maximum Off Time has expired

In some ambient conditions there are times when the unit may remain in a Start-Stop Off cycle for extended periods
of time. To ensure that the entire load stays within the normal restart temperature range, the MAXIMUM OFF TIME
Functional Parameter may be used to force the unit to restart with the evaporator fans running to circulate air in the
compartment. This will ensure there are no hot spots and the temperature sensor reading accurately reflects prod-
uct temperature. The parameter value may be set to 0 minutes or from 10 to 225 minutes in 1 minute intervals.

If the MAXIMUM OFF TIME is “OFF“, there is no maximum off time for Start-Stop and the unit will remain off. The
factory default setting is OFF.

If this is the only reason operation is required, the unit will operate as if it is in Continuous Operation until the
requirement has been met.