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i/c Systems, Acn. and ON to STOP sequences. This logic also controlled the water accumulator fill Detailed descriptions of the sequential steps performed during the mode transitions sequence based on an elapsed time set at about six-hour intervals. (Power On, Startup, Water Tank Fill, and Shutdown) are presented in Appendix 1. The monitor instrumentation for the test system of the SFWEM consisted of circuits previously developed for use in other life support systems. A basic element in this instrumentation was a PC card which contained signal conditioners, level detectors, storage, lamp drivers, and logic, along with built-in test features as shown in the block diagram of Figure 19. The typical monitoring card accepted a sensor input signal and conditioned it to the standard 0 to 5V DC level. The conditioned signal was available for analog readout by plug-in test equipment. The 0 to 5V DC signal was digitized on the card by two or three level detectors into three or four ranges, depending on the parameter being processed. The third level (entering into the fourth range) was the shutdown level. The logic on the card allowed both the present level and the previously attained highest level to be displayed simultaneously on indicator lamps. A reset input allowed the stored information to be removed when desired. Also, a lamp test input allowed the lamps connected to the card to be checked. The present level signals from the cards were connected to a status summary logic circuit which could operate a system status summary indicator displaying the highest present level from all monitor instrumentation cards. A scanning system was required to monitor individual cell voltages from the SFWEM. Card Type B10 (see Table 4) contains the relays for scanning the cell voltages. This card was operated from Card Type B9 which contained the logic to drive the relays and also the circuits necessary to drive the cell counter panel readout. Display and Control Panel. All electronic circuits and controls, including the PC card rack were housed within a single container 48 cm (19 in) wide, 30 cm (12 in) high, and 41 cm (16 in) deep, as shown in Figure 20. Electrical connectors were used wherever possible between components of the test system and the controls themselves. The front panel of this container is a display and control panel which contains performance trend and fault analysis indicator lights, cell counter readout, control potentiometers, pushbuttons and toggle switches. During normal operation the trend and fault analysis indicators will have all green lamps lit. As a parameter moves out of its normal range it will first light the amber, then the flashing red, and finally the red indicator. Simul- taneously, with lighting the red indicator, an automatic shutdown signal will be sent to the sequence control logic. If the parameter returns to a lower level, the highest level having been attained will be indicated as well as the present, real time level. Parametric Readout. Figure 21 shows the STS parametric readout which allowed reading of all system parameters. This readout had two switches to allow selection of the parameter to be read on the meter. It was connected to the STS electronic cabinet by a cable and connector as shown. Monitor Instrumentation. 44PDF Image | WATER ELECTROLYSIS MODULE
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