62-61753-21
4 The battery is fully charged - Amperage.
The microprocessor will calculate the average current
draw over a 20 second period. Once this average
drops below the selected value, shutdown will be al-
lowed. The CURRENT FOR START/STOP SHUTOFF
is selected in the microprocessor Configurations. The
value may be set from 1 to 10 amps in 0.5 amp inter-
vals. The factory default setting is 5 amps.
5 The refrigerated compartment temperature is at
setpoint.
Shutdown will be allowed when the active probe tem-
perature is within ±0.3°C (±0.5°F) of set point, in the
Perishable Range. In the Frozen Range, shutdown will
be allowed when the active probe temperature is with-
in ±0.3°C - the FROZEN SHUT DOWN OFFSET
(±0.5°F- the FROZEN SHUT DOWN OFFSET) of set
point.
The FROZEN SHUT DOWN OFFSET Functional Pa-
rameter may be set from 0°C (0°F) to 2°C (3.6°F) in
0.5°(C or F) increments. The factory default setting is
0°C (32°F).
4.3.3 Re-Start Parameters
While the unit is in Start-Stop Off, restart will be initiat-
ed when one of the following conditions occurs:
1 Engine coolant temperature drops below se-
lected 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 -12.2°C (10°F) to
0°C (32°F) in 0.5°(C or F) increments. The factory
default setting is 0°C (32°F).
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 en-
gine will be started. The value may be set from 12.0 to
12.8 volts. The factory default setting is 12.2 volts.
TIP
While the unit is running, the status of the unit
battery can be readily checked by reading the
Battery Voltage in the Data List. If "OK." ap-
pears after the voltage reading, battery voltage
is sufficient to allow the unit to cycle off.
3 Refrigerated compartment Temperature has
exceeded the microprocessor Functional Pa-
rameter value.
The microprocessor continually monitors the refriger-
ated compartment temperature. If the temperature
should drift outside the OVERRIDE TEMPERATURE
Functional Parameter value the unit will be restarted.
The value may be set from 2°C (3.6°F) to 10°C (18°F)
in 0.5° increments. The factory default setting is 6°C
(11°F).
4 The Maximum Off Time has expired.
In some ambient conditions, there are times when the
unit may be off for very long periods of time. To ensure
that the entire load stays within required temperature
ranges, the MAXIMUM OFF TIME Functional Parame-
ter may be used to force the unit to restart. The pa-
rameter value may be set to OFF or from 10 to
225 minutes in 1 minute intervals. The factory default
setting is OFF.
5 The 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 one of the other Re-Start parameters is
calling for re-start. The parameter value may be set
from 10 to 90 minutes in 1 minute intervals. The facto-
ry default setting is 20 minutes.
4.4 CONTINUOUS OPERATION
In Continuous Operation, the unit will not shut down
except in response to a shut down alarm. Continuous
Operation is normally used for fresh produce and other
sensitive product loads. The Start-Stop/Continuous
key is pressed to switch between Continuous and
Start-Stop operating modes. The corresponding LED
will be illuminated.
NOTE
The microprocessor may be locked so that the
unit will always operate in Start-Stop or in
Continuous whenever the setpoint is within a
specific range. Refer to Range Lock (Section
4.6.2) and ProductShield (Section 4.6.3) for
additional information.
4.5 TEMPERATURE CONTROL
4.5.1 Temperature Determination
The microprocessor monitors the temperature read-
ings from the supply and return temperature sensors
to determine the mode of operation required to main-
tain refrigerated compartment temperature in accord-
ance with the Setpoint.
Based on the sensor readings and time, the micropro-
cessor will calculate a Controlling Temperature value.
This value is calculated to provide smoother tempera-
ture control and transition between the modes of oper-
ation. The modes of operation include Pulldown, Cool,
Heat and Null.
4.5.2 Heat/Cool/Null Mode Switching Logic
Operation in Cool, Heat and Null modes is determined
in accordance with the calculated Controlling Temper-
ature value (CT) and the difference between this value
and Setpoint (SP) in accordance with the following:
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