4/Tests and Troubleshooting
1503-0151-000 5/26/0 4-13
Test Pressure Limit Switch
The software tests the pressure limit switch to make sure that it trips at the correct
manifold over pressure. The software opens the flow valve to a value where pres-
sure continues to increase. It then waits for the DPL (Drive Pressure Limit) switch
to trip. The pressure at which the DPL switch tripped is indicated. This value is cal-
culated manifold pressure (the typical reading is 112 cmH
2
O) not the actual pres-
sure at the switch. If the DPL switch never trips (within 15 seconds) the test fails.
If the DPL switch does not trip at a pressure within the correct tolerance, the test fails.
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