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Phase-sequence detector II

2014-11-08 02:31  
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This circuit derives its supply voltage, Vcc and Vdd from <£c. This factor, together with the neon lamps and zener diodes in the phase inputs, establishes 50% threshold that detects low voltage or absence of one or more phases. Phase-sequence detector II  - schematic
Relay K1 energizes for correct phase volts.