TK 56433-5-MM-EN
19
allowing continued operation of the unit at a
temporarily reduced refrigeration capacity.
•
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n:: This
protection algorithm protects the engine from high
coolant temperature shutdowns and possible
engine damage. It will reduce the load on the
engine by temporarily reducing refrigeration
capacity. This lowers the engine temperature while
still allowing continued unit operation.
•
M
Mo
od
du
ulla
attiio
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n C
Co
on
nttrro
oll:: Modulation control provides
precise control of the temperature in the cargo area.
As the return air temperature begins to approach
the setpoint, the microprocessor begins to close the
ETV to reduce the capacity. The microprocessor
closes the ETV more as the return air temperature
gets closer to the setpoint. When the return air
temperature is near setpoint, the ETV may close to
its limit and the hot gas bypass valve may open.
When the return air temperature begins to move
away from the setpoint, the ETV begins to open and
the hot gas bypass valve closes (if it was open).
This provides very smooth and steady temperature
control and the temperature does not oscillate
above and below setpoint as much as it does in a
unit that does not have modulation control.
SMART REEFER 3 (SR-3) Control System
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The SR-3 is a microprocessor control system designed
for a transport refrigeration system. The SR-3
integrates the following functions:
•
Changing setpoint and operating mode
•
Viewing gauge, sensor, and hourmeter readings
•
Initiating Defrost cycles
•
Viewing and clearing alarms
The microprocessor components are located inside the
control box, which is located inside the lower roadside
service door. The microprocessor is connected to a
Human Machine Interface (HMI) Control Panel. It is
used to operate the unit. The HMI control panel is
mounted on the face of the control box. It is clearly
visible through an opening in the lower roadside
service door.
Refer to the SR-3 Trailer Single Temperature SL-400e,
SLX/SLXe/SLXi Series Diagnostic Manual TK 56487 for
complete operation and service information about the
SR-3 Control System and the related components.
Refer to the Operator’s Manual for information about
basic unit operation.
CYCLE-SENTRY™ Start-Stop Controls
The CYCLE-SENTRY Start-Stop fuel saving system
provides optimum operating economy.
W
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When CYCLE-SENTRY Mode is selected, the unit will
start and stop automatically to maintain setpoint, keep
the engine warm, and the battery charged. When
Continuous Mode is selected, the unit starts
automatically and runs continuously to maintain
setpoint and provide constant airflow.
N
No
otte
e:: The SR-3 Controller provides a wide range of
control and programming flexibility. However,
pre-programming of the unit controller may
prohibit operation in certain temperature ranges
within some modes and may also prohibit
certain modes of operation. Refer to the SR-3
Trailer Single Temperature SL-400e, SLX/SLXe/
SLXi Series Diagnostic Manual TK 56487 for
information about controller programming.
In CYCLE-SENTRY, if the block temperature falls below
30 F (-1 C), the engine will start and run until the block
temperature is above 90 F (32 C). If the battery voltage
falls to the programmed limit selected by CYCLE-
SENTRY Battery Voltage (typically 12.6 volts) and
Diesel CYCLE-SENTRY mode is selected, the engine
will start and run until the charge rate falls below that
programmed by CYCLE-SENTRY Amps (typically 2
amperes).
Features of the CYCLE-SENTRY system are:
•
Offers either CYCLE-SENTRY or Continuous Run
operation.
•
Controller regulated all season temperature
control.
•
Maintains minimum engine temperature in low
ambient conditions.
•
Battery Sentry keeps batteries fully charged during
unit operation.
•
Variable preheat time.
•
Preheat indicator buzzer.
Data Logging
There are two separate data loggers. The data is
downloaded through one of the data ports using a flash
drive or a PC and WinTrac software.
