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Figure 26-2. Front panel of automatic cycle controller for 1.4kWh battery system. • • • • m m CONSTANT CURRENT CHARGE - A timed phase, the CONSTANT CURRENT CHARGE mode, entered when the store reaches operating temperature, controls power rectifier current flow at a preset level. TURNAROUND - A short timed mode, TURNAROUND set, the period between CHARGE and DISCHARGE modes to allow chlorination of the electrolyte. POLARIZE - The main electrolyte pump turned off, rectifier on to 1/2 normal current. The battery drops to a low limit voltage due to lack of CI2. At the limit, the main electrolyte pump is turned on to a predetermined speed. CONSTANT CURRENT DISCHARGE - This mode is a timed phase during which current is held at a preset level. VARIABLE DISCHARGE - This phase removes all useful charge from the battery. Constant current flow is maintained until the battery can no longer support the normal output voltage level. As voltage drops, the current is incremented toward zero current flow and the test cycle automatically proceeds to the CLEANOUT phase. CLEANOUT - Any zinc remaining on the electrodes is stripped from the battery stack by circulating electrolyte and a "short" (load resistors) connected across the battery terminals during this timed phase. Then, control returns to COOLDOWN and the test cycle is repeated. 26-4PDF Image | Development of the Zinc-Chlorine Battery for Utility
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