Section 4 – SR-2 Operation
Pretrip
A Pretrip Test verifies unit operation. This display allows a Pretrip Test to be selected and initiated by the
operator. If the Pretrip Test is entered with the unit shut down a Full Pretrip Test with device amp checks will be
performed. If the Pretrip Test is entered with the unit running in either diesel or electric mode a Running Pretrip
Test is performed. Test results are reported as PASS, CHECK or FAIL when the Pretrip Test is completed.
Pretrip Test Conditions
• Pretrip Test can be run in either Diesel or Electric Mode.
• The unit will auto switch from Diesel Mode to Electric Mode or from Electric Mode to Diesel Mode during
a Pretrip Test if these features are enabled and the auto switch conditions occur.
Conditions where Pretrip Tests are not allowed
• Shutdown alarms are present. Pretrip tests are allowed with some Check and Log alarms.
• The unit is in Sleep Mode.
• Unit is in Service Test Mode, Interface Board Test Mode or Evacuation Mode.
Pretrip Test Sequence
Pretrip tests proceed in the order shown below. A Full Pretrip Test includes all tests. A Running Pretrip Test is
started with the engine or motor running and does not include the Amp Checks or Engine Start Check.
• Amp Checks – Each electrical control component is energized and the current drawn is confirmed as
within specification.
• Engine Start – The Engine will start automatically.
• Defrost – If the coil temperature is below 45°F (7°C), a defrost cycle is initiated.
• RPM Check – The engine RPM in high and low speed is checked during the Cool Check.
• Cool Check – The ability of the unit to cool in low speed is checked.
• Heat Check - The ability of the unit to heat in low speed is checked.
• Report Test Results – The test results are reported as PASS, CHECK or FAIL when the Pretrip Test is
completed. If test results are CHECK or FAIL alarm codes will exist to direct the technician to the source
of the problem.
4-46
31 January 2005
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