Continuous Operation; Re-Start Parameters - Carrier VECTOR 6500 Operation & Service Manual

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:
1. Engine coolant temperature drops below selec-
ted microprocessor Configuration value
If in Engine Operation, the microprocessor 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) in 0.5_(C or F) increments. The factory default
setting is 32_F (0_C).
2. Battery voltage falls below selected micropro-
cessor Configuration value
The microprocessor will monitor battery voltage. If
battery voltage is at or below the VOLTAGE FOR
START-STOP RESTART Configuration value the
engine will be started or, when in a Standby Operation
OFF Cycle, a PSCON relay will energize (to supply
power to the battery charger) . The value may be set
from 12.0 to 12.8 volts. The factory default setting is
12.2 volts.
When the microprocessor is powered up, the
status of the unit battery can be readily checked
by reading the Battery Voltage in the Data List.
If "OK." appears after the voltage reading, bat-
tery voltage is sufficient to allow the unit to cycle
off.
3. The 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 - in low speed) with the evaporator fans
operating to ensure there are no hot spots and the
temperature sensor is accurately reflecting the
temperature of the product. The parameter value may
be set to OFF 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.
4. The Minimum Off Time has expired
The MINIMUM OFF TIME Functional Parameter setting
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 value selected in the
Functional Parameters away from set point. In the
Frozen Range, restart is allowed when the compartment
temperature is greater than the FROZEN RESTART
value above set point.
TIP
The MINUMUM OFF TIME parameter value may be set
from 10 to 90 minutes in 1 minute intervals. The factory
default setting is
TEMPERATURE value may be set from 0.5 to 18_F (2 to
10_C) in 0.5 (F or C) increments. The factory default is
5.5_F (3_C).
5. Compartment temperature has exceeded the
Override Functional Parameter value
During MINIMUM OFF TIME the microprocessor
continually monitors the refrigerated compartment
temperature. If the temperature should drift outside the
START-STOP
Functional Parameter value the unit will be restarted.
The value may be set from 3.6 to 18_F (2 to 10_C) in
0.5° increments. The factory default setting is 11_F
(6_C).
Whenever the unit restarts, temperature control will be
in the PullDown or Pull-Up mode (refer to Section 4.3.3).

4.5 CONTINUOUS OPERATION

4.5.1. Introduction
In Continuous Operation, the unit will not shutdown except
in response to a shutdown alarm. Temperature control in
the compartment will operate under Pulldown, Pull-Up,
Cooling, Heating or Null.
Continuous Operation is normally used for fresh produce
and other sensitive
Start-Stop/Continuous key is pressed to switch between
Continuous Operation and Start-Stop Operation. The
corresponding LED will be illuminated.
The microprocessor may be locked so that the
unit will always operate in Start-Stop or in Con-
tinuous whenever the set point is within a spe-
cific range. Refer to Range Lock (Section 4.7.2)
for additional information.
4.5.2. Continuous Operation
Refer to Figure 4−2 and Figure 4−3 for the Switch Point
temperatures at which speed changes, unloading
changes, heater operation and change to Null Mode
occur while operating in Continuous Operation.
The switch points will differ depending on the setting of
the microprocessor ECO MODE Functional Parameter.
This value may be set to YES or NO. The factory default
setting is NO. With ECO MODE set to NO, the
microprocessor will control temperature closer to set
point, yielding maximum product protection. With ECO
MODE set to YES, the microprocessor uses the Start
Stop Override Functional Parameter setting (even
though the unit is in Continuous Operation) and will
control temperature within a wider band, yielding
improved fuel economy.
When neither heating or cooling is required the unit will
enter Null Mode. In Null Mode, the electronic expansion
valve (EEXV) is closed to 0% while the evaporator
fan(s) continue to run.
4−5
20 minutes. The
OVERRIDE TEMPERATURE
product loads.
NOTE
RESTART
The
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