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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. A PTI must only be performed with a well vented container box.
3.4.1
Initiating a PTI
1. First, perform system maintenance checks. Refer to
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 compo-
nents and calibration of O2 and CO2 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.
Code
Component Tested
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 Sequence: Test initiates with all EverFRESH and refrigeration machinery off.
Pass Criteria: Validate the MPT. Verifies the sensor is not in alarm status and reading -5 to 5 psig.
P20-1
EverFRESH Air Compressor (EAC) Test
Test Sequence: Start the EAC, open the WDV and run for 10 seconds. Close the WDV and run up to 5 minutes
or until pressure reaches 60 PSIG.
Pass Criteria: 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
Test Sequence: EAC continues running from the previous test. Record the MPT. Open the EA for 5 seconds.
Record the MPT. Shut off the EAC, wait 5 seconds and close the EA.
Pass Criteria: MPT Pressure change > 40 PSI when the EA opens. EA Current between 100 and 200mA.
P20-3
Water Drain Valve (WDV) Solenoid Test
Test Sequence: Energize the EAC and allow the system to run up to 5 minutes to build pressure. Record the
MPT. Open the WDV and record the pressure. Shut down the EAC. Wait 5 seconds, then check the WDV
current. At the end of the test, close the WDV.
Pass Criteria: MPT Pressure change > 40 PSI when the WDV opens. WDV current is between 100 and 200mA.
A PTI should not be run after a frozen condition, including AUtO2.
Table 3–1 Pre-Trip Test Codes
NOTE
Section 6.1
PTI Preparation.
3–3
T-374
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Troubleshooting
