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ife Sstems. Jnc. conditions. During circulation, any gases present were trapped in a transparent gas separator. The internal volume of the separator was calibrated to quantify possible gas accumulation. Electrical Subsystem The electrical subsystem of the STS consisted of sensors and electronic components to provide control of SFWEM current, SFWEM operating temperature and system startup and shutdown sequences, as well as protective monitoring of system parameters. The control and monitor instrumentation used Life Systems' standard printed circuit (PC) cards. The total test system required 19 PC cards, 14 for monitoring and five for control c yits. All monitoring cards were similar to previously built and tested cards while the five control cards were designed specifically for the SFWEM test system. Table 4 is a detailed listing of the PC cards needed, indicating the card number, name, function, quantity, and number of performance trend levels. SFWEM Current Control. The current control converted DC input power to a constant, adjustable DC current which was used to power the SFWEM. Figure 17 is a block diagram of this control. The DC input power was sent to a solid state power switch which was turned on and off at a fixed rate with a variable duty cycle as determined by the pulse width modulator circuit. The chopped power was then filtered to produce a smooth DC current and was passed through a current measuring shunt to the SFWEM. The shunt signal goes to the control logic where it was compared with a current set signal (external or internal). The difference between these two signals was used to operate the pulse width modulator until the current signal from the shunt and the current set signal were equal. Thus, the SFWEM current tracked the current set signal. The use of a switching regulator resulted in a very efficient system with a power conversion efficiency of 85%. The current control system for the SFWEM delivered from 0 to 50 amps to a cell or module load with a voltage compliance of 0 to 20 volts. SFWEM Temperature Control. The temperature control maintained the SFWEM at a predetermined temperature by actuating a three-way solenoid valve which caused the liquid coolant to bypass or flow through a liquid-to-liquid heat exchanger. Figure 18 is a block diagram of this control system. The SFWEM temperature was monitored by means of a thermistor type temperature sensor. This signal was sent to the temperature control logic where it was compared with a manual temperature set signal. The difference between these two signals was used to operate the valve driver circuit which controls the position of the valve. Sequence Control Logic. The STS had two operating modes, STOP and ON, and one nonoperating mode during which the system power was totally removed. The system sequence control logic controlled the transitions during the STOP to ON 40PDF Image | WATER ELECTROLYSIS MODULE
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