p/n 18603-001, Rev. C LTV
®
1200/1150 Ventilator Service Manual Page 6-31
Step Test
The flow valve stepper motor synchronization test is used to exercise the flow valve and
insure LTV
®
software / hardware synchronization.
1) Set the ventilator to VENT MAINTENANCE mode (VENT MTNCE), (refer to Vent
Maintenance Entry in this chapter).
2) From the VENT MTNCE display, press Select and rotate the Set Value knob to select
the STEP TEST display.
3) Press Select to start the test.
The flow valve stepper motor will begin to actuate continuously for approximately seven
(7) minutes. During the test, the status monitor window display will change continuously.
To the right side of the display a numeric value will appear (for example, “3”) to indicate
the maximum number of step errors that have occurred during the test.
Upon completion of the test, the status monitor window will automatically display the
results of the test with one of the following messages:
PASS X (where “X” is a number of 8 or less)
or,
FAIL X (where “X” is a number greater than 8)
Ventilator Settings and Procedure Performance Requirement
Steps 1 through 3 (above).
PASS X
4) If ventilator fails this test, replace the flow valve assembly and re-test.
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