Carrier TRANSICOLD Vector 8500 Operation & Service Manual Download

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4–4

NOTE

The control system may be locked so that
the unit will always operate in Start-Stop
whenever the setpoint is within a specific
range. Refer to Range Lock (

Section

4.10.2

) for additional information.

4.5.1

Start-Stop Configuration

Start-Stop Operation is dependent on both Configura-
tion and Functional Parameter settings. The first set-
t i n g t o b e c o n s i d e r e d i s t h e S TA RT- S TO P
PARAMETERS Configuration. This setting determines
control actions when in the Perishable Range or Fro-
zen Range. The available settings are TOGETHER
and SEPARATE.

• When SEPARATE is chosen the control action

will be different, depending on whether the set-
point is in the Perishable Range or in the Frozen
Range (refer to

Section 4.7.1

• When TOGETHER is chosen, the same settings

apply to any setpoint.

TOGETHER

is selected, then the following Func-

tional Parameter values will be available for use:

• MINIMUM RUN TIME

• MINIMUM OFF TIME

• RESTART TEMPERATURE

• OVERRIDE TEMP

• MAXIMUM OFF TIME

• FROZEN SHUTDOWN OFFSET

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

NOTE

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.

4.5.2

Stop Parameters

Whenever the unit starts in Start-Stop Operation, it will
remain in the Start-Stop ON cycle until

all

five 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 circu-
late 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 setting is 4 minutes.
If all Start

−

Stop parameters required to enter a

Start

−

Stop Off cycle have been met except this param-

eter, the unit will operate with the compressor and
heaters off and the evaporator fan running until this
parameter has also been met.

2. Engine coolant temperature has warmed

Each time the unit is started in Engine Operation it
must continue to run until the coolant temperature rises
to 95°F (35°C) to ensure it has fully warmed up before
shutdown is allowed.
If all Start

−

Stop parameters required to enter a

Start

−

Stop Off cycle have been met except this param-

eter, the unit will operate with the compressor and
heaters off and the evaporator fan running until this
parameter has also been met.

3. 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
voltage based on the ambient temperature and shut-
down will be allowed when battery voltage is at or
above the calculated value.

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 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 the
compressor and heaters off and the evaporator fan
running until voltage is greater than 13.1 VDC or the
greater of the applicable MINIMUM RUN TIME func-
tional parameter setting, or 20 minutes has elapsed
(this applies to restart based on battery voltage only).