3–3
T-374
3.4 Pre-Trip Inspection
An EverFRESH Pre-Trip Inspection (PTI) is required to run prior to cargo being loaded in order to test operation of
mechanical components and calibrate the sensors. EverFRESH efficiency is directly related to box integrity, so a
PTI must only be performed with a well vented container box.
NOTE
A PTI should not be run after a frozen condition, including AUTO2.
3.4.1
Initiating a PTI
1. First, perform system maintenance checks. See
PTI Preparation.
2. Press the PRE-TRIP key to access the Pre-trip selection menu.
3. Use the Arrow keys to display “AutCA” and then press the ENTER key. This allows for testing of
components and calibration of O
2
and CO
2
sensors.
4. To skip the sensor calibrations and test only the mechanical components, use the Arrow keys to display
“P20” then press the ENTER key.
3.4.2
PTI Individual Test Codes
When testing components and troubleshooting the system, individual Pre-trips can be initiated from inside the Pre-
trip selection menu by selecting "P20". This code is for EverFRESH PTI machinery only. During the individual
"P20" tests, sensor calibration will be skipped. Current readings for the EverFRESH Air Compressor (EAC)
contactor and solenoid valves are taken internally on the ML5 controller.
Table 3–1 Pre-Trip Test Codes
Code
Component Tested
Test Sequence
Pass Criteria
Component Acronyms Referenced: Membrane Pressure Transducer (MPT), EverFRESH Air Compressor
(EAC), Water Drain Valve (WDV), EverFRESH Air Valve (EA), EverFRESH Nitrogen Valve (EN)
P20-0
Membrane Pressure
Transducer (MPT)
Test
Test initiates with all EverFRESH
and refrigeration machinery off.
Validate the MPT. Verifies the sensor is
not in alarm status and reading -5 to 5
psig.
P20-1
EverFRESH Air
Compressor (EAC)
Test
Start EAC and open WDV and run
for 10 seconds. Close WDV and run
up to 5 minutes or until pressure
reaches 60 PSIG.
EAC Current draw > 1.0 amps.
MPT in range 60 to 135 PSIG.
EAC Contactor current in range 350 to
760 mA.
P20-2
EverFRESH Air Valve
(EA) Solenoid Test
EAC continues running from
previous test. Record MPT. Open
EA for 5 seconds. Record MPT.
Shut off EAC, wait 5 seconds and
close EA.
MPT Pressure change > 40 PSI when
EA opens.
EA Current between 100 and 200mA.
P20-3
Water Drain Valve
(WDV) Solenoid Test
Energize EAC and allow the system
to run up to 5 minutes to build
pressure. Record MPT. Open WDV
and record pressure. Shut down the
EAC. Wait 5 seconds, then check
WDV current. At the end of the test,
close WDV.
MPT Pressure change > 40 PSI when
WDV opens.
WDV Current between 100 and 200mA.
Summary of Contents for EverFRESH
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Page 72: ...T 374 9 2 Figure 9 2 Schematic Units with CO2 Injection Page 1 ...
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