Carrier TRANSICOLD Vector 8500 Operation & Service Manual Download

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4–5

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If in Electric Operation and 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.

4. 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 SHUT-
OFF 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 in Engine Operation and all Start-Stop parameters
required to enter a Start-Stop Off cycle have been met
except this parameter, the unit will operate with com-
pressor and heaters off and evaporator fan running
until battery amperage draw is less than 7.0 amps.
If in Electric Operation and the compressor has cycled
off, PSCON will remain energized (to supply power to
the battery charger) until battery amperage draw is less
than 7.0 amps.

5. Compartment temperature requirement is satis-

fied

In Start-Stop Operation the refrigeration system will
operate in Pulldown or Pull-Up Mode in order to reach
the shutdown condition as quickly as possible.
Shutdown will be allowed when the compartment tem-
perature is within 0.5°F (0.3°C) of setpoint, for opera-
tion in Perishable Range. In Frozen Range, shutdown
will be allowed when the compartment temperature is
calculated to be within 0.5°F (0.3°C) minus the FRO-
ZEN 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.

4.5.3

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 4.7.1

), the

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

1. Engine coolant temperature drops below

selected Configuration value

If in Engine Operation, the control system will monitor
coolant temperature. If coolant temperature drops
below the ENGINE TEMPERATURE FOR RESTART

Configuration value the engine will be started. The
Configuration value may be set from 10 to 32°F (-12.2
to 0°C). The factory default setting is 10°F (

−

12.2°C). 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. Battery voltage falls below selected Configura-

tion value

The control system will monitor battery voltage. If bat-
tery voltage is at or below the VOLTAGE FOR START-
STOP RESTART Configuration value the engine will
be started. 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 volt-
age 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.

3. 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 MAXI-
MUM OFF TIME Functional Parameter may be used to
force the unit to restart (if in Engine Operation, in low
speed) 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 product temperature. The parameter value may
be set to 0 minutes or from 10 to 225 minutes in 1 min-
ute intervals.
If the MAXIMUM OFF TIME is “OFF“, there is no maxi-
mum 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.

4. Minimum Off Time has expired

The MINIMUM OFF TIME Functional Parameter set-
ting allows the unit to remain off for extended periods of
time, maximizing fuel/power economy. The unit may
not be restarted until the MINIMUM OFF TIME has
expired and the compartment temperature is greater
than the PERISHABLE RESTART TEMPERATURE
value selected in the Functional Parameters away from
setpoint. In the Frozen Range, restart is allowed when
the compartment temperature is calculated to be
greater than 0.5°F above setpoint. The MINIMUM OFF
TIME parameter value may be set from 10 to 90 min-
utes in 1 minute intervals. The factory default setting is
30 minutes. The RESTART TEMPERATURE value
may be set from 0.5 to 18°F (0.28 to 10°C) in 0.5 (F or
C) increments. The factory default is 5.4°F (

−

14.7°C).