Internal Pump Pressure Generation And Control - Fluke Calibration 4322-SYS-NAVAIR Service Manual

Controller. Table 2-1 shows the configurations of the isolation valves, solenoids, and
piezo-electric valves at different phases or pressures.

Internal Pump Pressure Generation and Control

The internal pump is used to control pressures below 4 psig. Between 4 psig and
300 psig, either the pump or external supply can be selected. When the internal pump is
used, the microprocessor closes PV1 and PV2 to isolate the external supply.
For best results, the external supply should be removed.
The microprocessor uses the atmosphere valve (A1) and the coarse valve (C1) to change
pressure quickly and uses the atmosphere valve (A1) and the fine valve (F1) for precise
pressure control. Refer to Figure 2-2 and Table 2-1 as required.
Note
Theory of Operation
Controller
2
2-7