barfield DPS1000 User Instruction Manual

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barfield DPS1000 User Instruction Manual Manual pdf 50 page image

56-101-01175 Revision I Page | 50proportional control valves and the transducers. During this test, the unit’s internalmanifold mounted output valves SvPs_Out and SvPt_Out are closed (refer toDPS1000 Internal Pneumatic diagram, Appendix C), and therefore the Ps and PtOutput reservoirs are not included in this test.6. The Vacuum and pressure pumps are tested to verify they are able to achieve theperformance expected.7. The initialization display window and log file includes the Test Set’s power on cyclecount: # of hours the Test Set has been powered ON, # of hours on the pressurepump, # of hours on the vacuum pump.8. At the end of the initialization cycle the Test Set performs a Go to Ground to ensureboth the STATIC (Ps) and PITOT (Pt) ports are at ambient pressure.Note: During this power ON initialization Go To Ground phase the Target ROC willdefault to a very low rate (2,000 ft/min), the user can change the ROC for thatoccurrence by pressing the ROC touch zone and changing the Target value.Note: After power ON initialization has completed, the Test Set will remain in LeakMeasure mode with the STATIC (Ps) and PITOT (Pt) ports Vented to ambientand the displayed message will be:Figure 47 Initialization DisplayC. Leak Measure ModeThe DPS1000 has two modes of operation, Leak Measure and Control. The defaultmode of operation for the DPS1000 is Leak Measure mode. At the conclusion of powerON initialization the Test Set will be placed in the Leak Measure mode.While in Leak Measure mode the Test Set is continuously measuring / monitoring thepressure on both the STATIC (Ps) and PITOT (Pt) ports. The display will be continuouslyupdated (~ 2 times/second) with the latest pressure measurement results. In LeakMeasure mode, the pneumatic pressure pump, vacuum pump and four proportionalcontrol values (PvPs_V, PvPs_P, PvPt_V, PvPt_P, reference DPS1000 Pneumaticdiagram, Appendix C) are off.When the Display Setup is configured for Aeronautical mode, the DPS1000 has someadditional features and safe guards such as ALR and Leak Test ATP.While in Leak Measure mode, the ALR “Auto Leak Recover” (if enabled) monitors theleak rate of ROC and RtCAS. If the rates exceed the values defined under the Limits